forked from luck/tmp_suning_uos_patched
Merge branch 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux
* 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux: tools, slub: Fix off-by-one buffer corruption after readlink() call slub: Discard slab page when node partial > minimum partial number slub: correct comments error for per cpu partial mm: restrict access to slab files under procfs and sysfs slub: Code optimization in get_partial_node() slub: doc: update the slabinfo.c file path slub: explicitly document position of inserting slab to partial list slub: update slabinfo tools to report per cpu partial list statistics slub: per cpu cache for partial pages slub: return object pointer from get_partial() / new_slab(). slub: pass kmem_cache_cpu pointer to get_partial() slub: Prepare inuse field in new_slab() slub: Remove useless statements in __slab_alloc slub: free slabs without holding locks slub: use print_hex_dump slab: use print_hex_dump
This commit is contained in:
Linus Torvalds
commit
138c4ae9cf
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@ -30,8 +30,6 @@ page_migration
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- description of page migration in NUMA systems.
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pagemap.txt
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- pagemap, from the userspace perspective
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slabinfo.c
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- source code for a tool to get reports about slabs.
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slub.txt
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- a short users guide for SLUB.
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unevictable-lru.txt
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@ -79,9 +79,21 @@ struct page {
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};
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/* Third double word block */
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struct list_head lru; /* Pageout list, eg. active_list
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union {
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struct list_head lru; /* Pageout list, eg. active_list
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* protected by zone->lru_lock !
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*/
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struct { /* slub per cpu partial pages */
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struct page *next; /* Next partial slab */
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#ifdef CONFIG_64BIT
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int pages; /* Nr of partial slabs left */
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int pobjects; /* Approximate # of objects */
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#else
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short int pages;
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short int pobjects;
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#endif
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};
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};
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/* Remainder is not double word aligned */
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union {
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@ -36,12 +36,15 @@ enum stat_item {
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ORDER_FALLBACK, /* Number of times fallback was necessary */
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CMPXCHG_DOUBLE_CPU_FAIL,/* Failure of this_cpu_cmpxchg_double */
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CMPXCHG_DOUBLE_FAIL, /* Number of times that cmpxchg double did not match */
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CPU_PARTIAL_ALLOC, /* Used cpu partial on alloc */
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CPU_PARTIAL_FREE, /* USed cpu partial on free */
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NR_SLUB_STAT_ITEMS };
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struct kmem_cache_cpu {
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void **freelist; /* Pointer to next available object */
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unsigned long tid; /* Globally unique transaction id */
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struct page *page; /* The slab from which we are allocating */
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struct page *partial; /* Partially allocated frozen slabs */
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int node; /* The node of the page (or -1 for debug) */
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#ifdef CONFIG_SLUB_STATS
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unsigned stat[NR_SLUB_STAT_ITEMS];
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@ -79,6 +82,7 @@ struct kmem_cache {
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int size; /* The size of an object including meta data */
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int objsize; /* The size of an object without meta data */
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int offset; /* Free pointer offset. */
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int cpu_partial; /* Number of per cpu partial objects to keep around */
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struct kmem_cache_order_objects oo;
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/* Allocation and freeing of slabs */
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19
mm/slab.c
19
mm/slab.c
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@ -1851,15 +1851,15 @@ static void dump_line(char *data, int offset, int limit)
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unsigned char error = 0;
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int bad_count = 0;
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printk(KERN_ERR "%03x:", offset);
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printk(KERN_ERR "%03x: ", offset);
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for (i = 0; i < limit; i++) {
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if (data[offset + i] != POISON_FREE) {
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error = data[offset + i];
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bad_count++;
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}
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printk(" %02x", (unsigned char)data[offset + i]);
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}
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printk("\n");
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print_hex_dump(KERN_CONT, "", 0, 16, 1,
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&data[offset], limit, 1);
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if (bad_count == 1) {
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error ^= POISON_FREE;
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@ -3039,14 +3039,9 @@ static void check_slabp(struct kmem_cache *cachep, struct slab *slabp)
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printk(KERN_ERR "slab: Internal list corruption detected in "
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"cache '%s'(%d), slabp %p(%d). Hexdump:\n",
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cachep->name, cachep->num, slabp, slabp->inuse);
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for (i = 0;
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i < sizeof(*slabp) + cachep->num * sizeof(kmem_bufctl_t);
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i++) {
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if (i % 16 == 0)
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printk("\n%03x:", i);
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printk(" %02x", ((unsigned char *)slabp)[i]);
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}
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printk("\n");
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print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 16, 1, slabp,
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sizeof(*slabp) + cachep->num * sizeof(kmem_bufctl_t),
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1);
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BUG();
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}
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}
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@ -4584,7 +4579,7 @@ static const struct file_operations proc_slabstats_operations = {
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static int __init slab_proc_init(void)
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{
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proc_create("slabinfo",S_IWUSR|S_IRUGO,NULL,&proc_slabinfo_operations);
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proc_create("slabinfo",S_IWUSR|S_IRUSR,NULL,&proc_slabinfo_operations);
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#ifdef CONFIG_DEBUG_SLAB_LEAK
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proc_create("slab_allocators", 0, NULL, &proc_slabstats_operations);
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#endif
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|
|
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558
mm/slub.c
558
mm/slub.c
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@ -467,34 +467,8 @@ static int disable_higher_order_debug;
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*/
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static void print_section(char *text, u8 *addr, unsigned int length)
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{
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int i, offset;
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int newline = 1;
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char ascii[17];
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ascii[16] = 0;
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for (i = 0; i < length; i++) {
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if (newline) {
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printk(KERN_ERR "%8s 0x%p: ", text, addr + i);
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newline = 0;
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}
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printk(KERN_CONT " %02x", addr[i]);
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offset = i % 16;
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ascii[offset] = isgraph(addr[i]) ? addr[i] : '.';
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if (offset == 15) {
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printk(KERN_CONT " %s\n", ascii);
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newline = 1;
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}
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}
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if (!newline) {
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i %= 16;
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while (i < 16) {
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printk(KERN_CONT " ");
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ascii[i] = ' ';
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i++;
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}
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printk(KERN_CONT " %s\n", ascii);
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}
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print_hex_dump(KERN_ERR, text, DUMP_PREFIX_ADDRESS, 16, 1, addr,
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length, 1);
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}
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static struct track *get_track(struct kmem_cache *s, void *object,
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@ -625,12 +599,12 @@ static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p)
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p, p - addr, get_freepointer(s, p));
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if (p > addr + 16)
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print_section("Bytes b4", p - 16, 16);
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print_section("Object", p, min_t(unsigned long, s->objsize, PAGE_SIZE));
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print_section("Bytes b4 ", p - 16, 16);
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print_section("Object ", p, min_t(unsigned long, s->objsize,
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PAGE_SIZE));
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if (s->flags & SLAB_RED_ZONE)
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print_section("Redzone", p + s->objsize,
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print_section("Redzone ", p + s->objsize,
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s->inuse - s->objsize);
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if (s->offset)
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|
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@ -643,7 +617,7 @@ static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p)
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if (off != s->size)
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/* Beginning of the filler is the free pointer */
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print_section("Padding", p + off, s->size - off);
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print_section("Padding ", p + off, s->size - off);
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dump_stack();
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}
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@ -838,7 +812,7 @@ static int slab_pad_check(struct kmem_cache *s, struct page *page)
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end--;
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slab_err(s, page, "Padding overwritten. 0x%p-0x%p", fault, end - 1);
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print_section("Padding", end - remainder, remainder);
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print_section("Padding ", end - remainder, remainder);
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restore_bytes(s, "slab padding", POISON_INUSE, end - remainder, end);
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return 0;
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@ -987,7 +961,7 @@ static void trace(struct kmem_cache *s, struct page *page, void *object,
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page->freelist);
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if (!alloc)
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print_section("Object", (void *)object, s->objsize);
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print_section("Object ", (void *)object, s->objsize);
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dump_stack();
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}
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@ -1447,7 +1421,7 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
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set_freepointer(s, last, NULL);
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page->freelist = start;
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page->inuse = 0;
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page->inuse = page->objects;
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page->frozen = 1;
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out:
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return page;
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@ -1534,7 +1508,7 @@ static inline void add_partial(struct kmem_cache_node *n,
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struct page *page, int tail)
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{
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n->nr_partial++;
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if (tail)
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if (tail == DEACTIVATE_TO_TAIL)
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list_add_tail(&page->lru, &n->partial);
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else
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list_add(&page->lru, &n->partial);
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@ -1554,10 +1528,13 @@ static inline void remove_partial(struct kmem_cache_node *n,
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* Lock slab, remove from the partial list and put the object into the
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* per cpu freelist.
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*
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* Returns a list of objects or NULL if it fails.
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*
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* Must hold list_lock.
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*/
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static inline int acquire_slab(struct kmem_cache *s,
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struct kmem_cache_node *n, struct page *page)
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static inline void *acquire_slab(struct kmem_cache *s,
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struct kmem_cache_node *n, struct page *page,
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int mode)
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{
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void *freelist;
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unsigned long counters;
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|
|
@ -1572,7 +1549,8 @@ static inline int acquire_slab(struct kmem_cache *s,
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freelist = page->freelist;
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counters = page->counters;
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new.counters = counters;
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new.inuse = page->objects;
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if (mode)
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new.inuse = page->objects;
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VM_BUG_ON(new.frozen);
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new.frozen = 1;
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|
|
@ -1583,32 +1561,19 @@ static inline int acquire_slab(struct kmem_cache *s,
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"lock and freeze"));
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remove_partial(n, page);
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|
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if (freelist) {
|
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/* Populate the per cpu freelist */
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this_cpu_write(s->cpu_slab->freelist, freelist);
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this_cpu_write(s->cpu_slab->page, page);
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this_cpu_write(s->cpu_slab->node, page_to_nid(page));
|
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return 1;
|
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} else {
|
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/*
|
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* Slab page came from the wrong list. No object to allocate
|
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* from. Put it onto the correct list and continue partial
|
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* scan.
|
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*/
|
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printk(KERN_ERR "SLUB: %s : Page without available objects on"
|
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" partial list\n", s->name);
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return 0;
|
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}
|
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return freelist;
|
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}
|
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|
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static int put_cpu_partial(struct kmem_cache *s, struct page *page, int drain);
|
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|
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/*
|
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* Try to allocate a partial slab from a specific node.
|
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*/
|
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static struct page *get_partial_node(struct kmem_cache *s,
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struct kmem_cache_node *n)
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static void *get_partial_node(struct kmem_cache *s,
|
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struct kmem_cache_node *n, struct kmem_cache_cpu *c)
|
||||
{
|
||||
struct page *page;
|
||||
struct page *page, *page2;
|
||||
void *object = NULL;
|
||||
|
||||
/*
|
||||
* Racy check. If we mistakenly see no partial slabs then we
|
||||
|
|
@ -1620,26 +1585,43 @@ static struct page *get_partial_node(struct kmem_cache *s,
|
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return NULL;
|
||||
|
||||
spin_lock(&n->list_lock);
|
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list_for_each_entry(page, &n->partial, lru)
|
||||
if (acquire_slab(s, n, page))
|
||||
goto out;
|
||||
page = NULL;
|
||||
out:
|
||||
list_for_each_entry_safe(page, page2, &n->partial, lru) {
|
||||
void *t = acquire_slab(s, n, page, object == NULL);
|
||||
int available;
|
||||
|
||||
if (!t)
|
||||
break;
|
||||
|
||||
if (!object) {
|
||||
c->page = page;
|
||||
c->node = page_to_nid(page);
|
||||
stat(s, ALLOC_FROM_PARTIAL);
|
||||
object = t;
|
||||
available = page->objects - page->inuse;
|
||||
} else {
|
||||
page->freelist = t;
|
||||
available = put_cpu_partial(s, page, 0);
|
||||
}
|
||||
if (kmem_cache_debug(s) || available > s->cpu_partial / 2)
|
||||
break;
|
||||
|
||||
}
|
||||
spin_unlock(&n->list_lock);
|
||||
return page;
|
||||
return object;
|
||||
}
|
||||
|
||||
/*
|
||||
* Get a page from somewhere. Search in increasing NUMA distances.
|
||||
*/
|
||||
static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags)
|
||||
static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags,
|
||||
struct kmem_cache_cpu *c)
|
||||
{
|
||||
#ifdef CONFIG_NUMA
|
||||
struct zonelist *zonelist;
|
||||
struct zoneref *z;
|
||||
struct zone *zone;
|
||||
enum zone_type high_zoneidx = gfp_zone(flags);
|
||||
struct page *page;
|
||||
void *object;
|
||||
|
||||
/*
|
||||
* The defrag ratio allows a configuration of the tradeoffs between
|
||||
|
|
@ -1672,10 +1654,10 @@ static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags)
|
|||
|
||||
if (n && cpuset_zone_allowed_hardwall(zone, flags) &&
|
||||
n->nr_partial > s->min_partial) {
|
||||
page = get_partial_node(s, n);
|
||||
if (page) {
|
||||
object = get_partial_node(s, n, c);
|
||||
if (object) {
|
||||
put_mems_allowed();
|
||||
return page;
|
||||
return object;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -1687,16 +1669,17 @@ static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags)
|
|||
/*
|
||||
* Get a partial page, lock it and return it.
|
||||
*/
|
||||
static struct page *get_partial(struct kmem_cache *s, gfp_t flags, int node)
|
||||
static void *get_partial(struct kmem_cache *s, gfp_t flags, int node,
|
||||
struct kmem_cache_cpu *c)
|
||||
{
|
||||
struct page *page;
|
||||
void *object;
|
||||
int searchnode = (node == NUMA_NO_NODE) ? numa_node_id() : node;
|
||||
|
||||
page = get_partial_node(s, get_node(s, searchnode));
|
||||
if (page || node != NUMA_NO_NODE)
|
||||
return page;
|
||||
object = get_partial_node(s, get_node(s, searchnode), c);
|
||||
if (object || node != NUMA_NO_NODE)
|
||||
return object;
|
||||
|
||||
return get_any_partial(s, flags);
|
||||
return get_any_partial(s, flags, c);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PREEMPT
|
||||
|
|
@ -1765,9 +1748,6 @@ void init_kmem_cache_cpus(struct kmem_cache *s)
|
|||
for_each_possible_cpu(cpu)
|
||||
per_cpu_ptr(s->cpu_slab, cpu)->tid = init_tid(cpu);
|
||||
}
|
||||
/*
|
||||
* Remove the cpu slab
|
||||
*/
|
||||
|
||||
/*
|
||||
* Remove the cpu slab
|
||||
|
|
@ -1781,13 +1761,13 @@ static void deactivate_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)
|
|||
enum slab_modes l = M_NONE, m = M_NONE;
|
||||
void *freelist;
|
||||
void *nextfree;
|
||||
int tail = 0;
|
||||
int tail = DEACTIVATE_TO_HEAD;
|
||||
struct page new;
|
||||
struct page old;
|
||||
|
||||
if (page->freelist) {
|
||||
stat(s, DEACTIVATE_REMOTE_FREES);
|
||||
tail = 1;
|
||||
tail = DEACTIVATE_TO_TAIL;
|
||||
}
|
||||
|
||||
c->tid = next_tid(c->tid);
|
||||
|
|
@ -1893,7 +1873,7 @@ static void deactivate_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)
|
|||
if (m == M_PARTIAL) {
|
||||
|
||||
add_partial(n, page, tail);
|
||||
stat(s, tail ? DEACTIVATE_TO_TAIL : DEACTIVATE_TO_HEAD);
|
||||
stat(s, tail);
|
||||
|
||||
} else if (m == M_FULL) {
|
||||
|
||||
|
|
@ -1920,6 +1900,123 @@ static void deactivate_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)
|
|||
}
|
||||
}
|
||||
|
||||
/* Unfreeze all the cpu partial slabs */
|
||||
static void unfreeze_partials(struct kmem_cache *s)
|
||||
{
|
||||
struct kmem_cache_node *n = NULL;
|
||||
struct kmem_cache_cpu *c = this_cpu_ptr(s->cpu_slab);
|
||||
struct page *page;
|
||||
|
||||
while ((page = c->partial)) {
|
||||
enum slab_modes { M_PARTIAL, M_FREE };
|
||||
enum slab_modes l, m;
|
||||
struct page new;
|
||||
struct page old;
|
||||
|
||||
c->partial = page->next;
|
||||
l = M_FREE;
|
||||
|
||||
do {
|
||||
|
||||
old.freelist = page->freelist;
|
||||
old.counters = page->counters;
|
||||
VM_BUG_ON(!old.frozen);
|
||||
|
||||
new.counters = old.counters;
|
||||
new.freelist = old.freelist;
|
||||
|
||||
new.frozen = 0;
|
||||
|
||||
if (!new.inuse && (!n || n->nr_partial > s->min_partial))
|
||||
m = M_FREE;
|
||||
else {
|
||||
struct kmem_cache_node *n2 = get_node(s,
|
||||
page_to_nid(page));
|
||||
|
||||
m = M_PARTIAL;
|
||||
if (n != n2) {
|
||||
if (n)
|
||||
spin_unlock(&n->list_lock);
|
||||
|
||||
n = n2;
|
||||
spin_lock(&n->list_lock);
|
||||
}
|
||||
}
|
||||
|
||||
if (l != m) {
|
||||
if (l == M_PARTIAL)
|
||||
remove_partial(n, page);
|
||||
else
|
||||
add_partial(n, page, 1);
|
||||
|
||||
l = m;
|
||||
}
|
||||
|
||||
} while (!cmpxchg_double_slab(s, page,
|
||||
old.freelist, old.counters,
|
||||
new.freelist, new.counters,
|
||||
"unfreezing slab"));
|
||||
|
||||
if (m == M_FREE) {
|
||||
stat(s, DEACTIVATE_EMPTY);
|
||||
discard_slab(s, page);
|
||||
stat(s, FREE_SLAB);
|
||||
}
|
||||
}
|
||||
|
||||
if (n)
|
||||
spin_unlock(&n->list_lock);
|
||||
}
|
||||
|
||||
/*
|
||||
* Put a page that was just frozen (in __slab_free) into a partial page
|
||||
* slot if available. This is done without interrupts disabled and without
|
||||
* preemption disabled. The cmpxchg is racy and may put the partial page
|
||||
* onto a random cpus partial slot.
|
||||
*
|
||||
* If we did not find a slot then simply move all the partials to the
|
||||
* per node partial list.
|
||||
*/
|
||||
int put_cpu_partial(struct kmem_cache *s, struct page *page, int drain)
|
||||
{
|
||||
struct page *oldpage;
|
||||
int pages;
|
||||
int pobjects;
|
||||
|
||||
do {
|
||||
pages = 0;
|
||||
pobjects = 0;
|
||||
oldpage = this_cpu_read(s->cpu_slab->partial);
|
||||
|
||||
if (oldpage) {
|
||||
pobjects = oldpage->pobjects;
|
||||
pages = oldpage->pages;
|
||||
if (drain && pobjects > s->cpu_partial) {
|
||||
unsigned long flags;
|
||||
/*
|
||||
* partial array is full. Move the existing
|
||||
* set to the per node partial list.
|
||||
*/
|
||||
local_irq_save(flags);
|
||||
unfreeze_partials(s);
|
||||
local_irq_restore(flags);
|
||||
pobjects = 0;
|
||||
pages = 0;
|
||||
}
|
||||
}
|
||||
|
||||
pages++;
|
||||
pobjects += page->objects - page->inuse;
|
||||
|
||||
page->pages = pages;
|
||||
page->pobjects = pobjects;
|
||||
page->next = oldpage;
|
||||
|
||||
} while (this_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page) != oldpage);
|
||||
stat(s, CPU_PARTIAL_FREE);
|
||||
return pobjects;
|
||||
}
|
||||
|
||||
static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cpu *c)
|
||||
{
|
||||
stat(s, CPUSLAB_FLUSH);
|
||||
|
|
@ -1935,8 +2032,12 @@ static inline void __flush_cpu_slab(struct kmem_cache *s, int cpu)
|
|||
{
|
||||
struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu);
|
||||
|
||||
if (likely(c && c->page))
|
||||
flush_slab(s, c);
|
||||
if (likely(c)) {
|
||||
if (c->page)
|
||||
flush_slab(s, c);
|
||||
|
||||
unfreeze_partials(s);
|
||||
}
|
||||
}
|
||||
|
||||
static void flush_cpu_slab(void *d)
|
||||
|
|
@ -2027,12 +2128,39 @@ slab_out_of_memory(struct kmem_cache *s, gfp_t gfpflags, int nid)
|
|||
}
|
||||
}
|
||||
|
||||
static inline void *new_slab_objects(struct kmem_cache *s, gfp_t flags,
|
||||
int node, struct kmem_cache_cpu **pc)
|
||||
{
|
||||
void *object;
|
||||
struct kmem_cache_cpu *c;
|
||||
struct page *page = new_slab(s, flags, node);
|
||||
|
||||
if (page) {
|
||||
c = __this_cpu_ptr(s->cpu_slab);
|
||||
if (c->page)
|
||||
flush_slab(s, c);
|
||||
|
||||
/*
|
||||
* No other reference to the page yet so we can
|
||||
* muck around with it freely without cmpxchg
|
||||
*/
|
||||
object = page->freelist;
|
||||
page->freelist = NULL;
|
||||
|
||||
stat(s, ALLOC_SLAB);
|
||||
c->node = page_to_nid(page);
|
||||
c->page = page;
|
||||
*pc = c;
|
||||
} else
|
||||
object = NULL;
|
||||
|
||||
return object;
|
||||
}
|
||||
|
||||
/*
|
||||
* Slow path. The lockless freelist is empty or we need to perform
|
||||
* debugging duties.
|
||||
*
|
||||
* Interrupts are disabled.
|
||||
*
|
||||
* Processing is still very fast if new objects have been freed to the
|
||||
* regular freelist. In that case we simply take over the regular freelist
|
||||
* as the lockless freelist and zap the regular freelist.
|
||||
|
|
@ -2049,7 +2177,6 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
|
|||
unsigned long addr, struct kmem_cache_cpu *c)
|
||||
{
|
||||
void **object;
|
||||
struct page *page;
|
||||
unsigned long flags;
|
||||
struct page new;
|
||||
unsigned long counters;
|
||||
|
|
@ -2064,13 +2191,9 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
|
|||
c = this_cpu_ptr(s->cpu_slab);
|
||||
#endif
|
||||
|
||||
/* We handle __GFP_ZERO in the caller */
|
||||
gfpflags &= ~__GFP_ZERO;
|
||||
|
||||
page = c->page;
|
||||
if (!page)
|
||||
if (!c->page)
|
||||
goto new_slab;
|
||||
|
||||
redo:
|
||||
if (unlikely(!node_match(c, node))) {
|
||||
stat(s, ALLOC_NODE_MISMATCH);
|
||||
deactivate_slab(s, c);
|
||||
|
|
@ -2080,8 +2203,8 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
|
|||
stat(s, ALLOC_SLOWPATH);
|
||||
|
||||
do {
|
||||
object = page->freelist;
|
||||
counters = page->counters;
|
||||
object = c->page->freelist;
|
||||
counters = c->page->counters;
|
||||
new.counters = counters;
|
||||
VM_BUG_ON(!new.frozen);
|
||||
|
||||
|
|
@ -2093,17 +2216,17 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
|
|||
*
|
||||
* If there are objects left then we retrieve them
|
||||
* and use them to refill the per cpu queue.
|
||||
*/
|
||||
*/
|
||||
|
||||
new.inuse = page->objects;
|
||||
new.inuse = c->page->objects;
|
||||
new.frozen = object != NULL;
|
||||
|
||||
} while (!__cmpxchg_double_slab(s, page,
|
||||
} while (!__cmpxchg_double_slab(s, c->page,
|
||||
object, counters,
|
||||
NULL, new.counters,
|
||||
"__slab_alloc"));
|
||||
|
||||
if (unlikely(!object)) {
|
||||
if (!object) {
|
||||
c->page = NULL;
|
||||
stat(s, DEACTIVATE_BYPASS);
|
||||
goto new_slab;
|
||||
|
|
@ -2112,58 +2235,47 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
|
|||
stat(s, ALLOC_REFILL);
|
||||
|
||||
load_freelist:
|
||||
VM_BUG_ON(!page->frozen);
|
||||
c->freelist = get_freepointer(s, object);
|
||||
c->tid = next_tid(c->tid);
|
||||
local_irq_restore(flags);
|
||||
return object;
|
||||
|
||||
new_slab:
|
||||
page = get_partial(s, gfpflags, node);
|
||||
if (page) {
|
||||
stat(s, ALLOC_FROM_PARTIAL);
|
||||
object = c->freelist;
|
||||
|
||||
if (kmem_cache_debug(s))
|
||||
goto debug;
|
||||
goto load_freelist;
|
||||
if (c->partial) {
|
||||
c->page = c->partial;
|
||||
c->partial = c->page->next;
|
||||
c->node = page_to_nid(c->page);
|
||||
stat(s, CPU_PARTIAL_ALLOC);
|
||||
c->freelist = NULL;
|
||||
goto redo;
|
||||
}
|
||||
|
||||
page = new_slab(s, gfpflags, node);
|
||||
/* Then do expensive stuff like retrieving pages from the partial lists */
|
||||
object = get_partial(s, gfpflags, node, c);
|
||||
|
||||
if (page) {
|
||||
c = __this_cpu_ptr(s->cpu_slab);
|
||||
if (c->page)
|
||||
flush_slab(s, c);
|
||||
if (unlikely(!object)) {
|
||||
|
||||
/*
|
||||
* No other reference to the page yet so we can
|
||||
* muck around with it freely without cmpxchg
|
||||
*/
|
||||
object = page->freelist;
|
||||
page->freelist = NULL;
|
||||
page->inuse = page->objects;
|
||||
object = new_slab_objects(s, gfpflags, node, &c);
|
||||
|
||||
stat(s, ALLOC_SLAB);
|
||||
c->node = page_to_nid(page);
|
||||
c->page = page;
|
||||
if (unlikely(!object)) {
|
||||
if (!(gfpflags & __GFP_NOWARN) && printk_ratelimit())
|
||||
slab_out_of_memory(s, gfpflags, node);
|
||||
|
||||
if (kmem_cache_debug(s))
|
||||
goto debug;
|
||||
goto load_freelist;
|
||||
local_irq_restore(flags);
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
if (!(gfpflags & __GFP_NOWARN) && printk_ratelimit())
|
||||
slab_out_of_memory(s, gfpflags, node);
|
||||
local_irq_restore(flags);
|
||||
return NULL;
|
||||
|
||||
debug:
|
||||
if (!object || !alloc_debug_processing(s, page, object, addr))
|
||||
goto new_slab;
|
||||
if (likely(!kmem_cache_debug(s)))
|
||||
goto load_freelist;
|
||||
|
||||
/* Only entered in the debug case */
|
||||
if (!alloc_debug_processing(s, c->page, object, addr))
|
||||
goto new_slab; /* Slab failed checks. Next slab needed */
|
||||
|
||||
c->freelist = get_freepointer(s, object);
|
||||
deactivate_slab(s, c);
|
||||
c->page = NULL;
|
||||
c->node = NUMA_NO_NODE;
|
||||
local_irq_restore(flags);
|
||||
return object;
|
||||
|
|
@ -2333,16 +2445,29 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
|
|||
was_frozen = new.frozen;
|
||||
new.inuse--;
|
||||
if ((!new.inuse || !prior) && !was_frozen && !n) {
|
||||
n = get_node(s, page_to_nid(page));
|
||||
/*
|
||||
* Speculatively acquire the list_lock.
|
||||
* If the cmpxchg does not succeed then we may
|
||||
* drop the list_lock without any processing.
|
||||
*
|
||||
* Otherwise the list_lock will synchronize with
|
||||
* other processors updating the list of slabs.
|
||||
*/
|
||||
spin_lock_irqsave(&n->list_lock, flags);
|
||||
|
||||
if (!kmem_cache_debug(s) && !prior)
|
||||
|
||||
/*
|
||||
* Slab was on no list before and will be partially empty
|
||||
* We can defer the list move and instead freeze it.
|
||||
*/
|
||||
new.frozen = 1;
|
||||
|
||||
else { /* Needs to be taken off a list */
|
||||
|
||||
n = get_node(s, page_to_nid(page));
|
||||
/*
|
||||
* Speculatively acquire the list_lock.
|
||||
* If the cmpxchg does not succeed then we may
|
||||
* drop the list_lock without any processing.
|
||||
*
|
||||
* Otherwise the list_lock will synchronize with
|
||||
* other processors updating the list of slabs.
|
||||
*/
|
||||
spin_lock_irqsave(&n->list_lock, flags);
|
||||
|
||||
}
|
||||
}
|
||||
inuse = new.inuse;
|
||||
|
||||
|
|
@ -2352,7 +2477,15 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
|
|||
"__slab_free"));
|
||||
|
||||
if (likely(!n)) {
|
||||
/*
|
||||
|
||||
/*
|
||||
* If we just froze the page then put it onto the
|
||||
* per cpu partial list.
|
||||
*/
|
||||
if (new.frozen && !was_frozen)
|
||||
put_cpu_partial(s, page, 1);
|
||||
|
||||
/*
|
||||
* The list lock was not taken therefore no list
|
||||
* activity can be necessary.
|
||||
*/
|
||||
|
|
@ -2377,7 +2510,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
|
|||
*/
|
||||
if (unlikely(!prior)) {
|
||||
remove_full(s, page);
|
||||
add_partial(n, page, 1);
|
||||
add_partial(n, page, DEACTIVATE_TO_TAIL);
|
||||
stat(s, FREE_ADD_PARTIAL);
|
||||
}
|
||||
}
|
||||
|
|
@ -2421,7 +2554,6 @@ static __always_inline void slab_free(struct kmem_cache *s,
|
|||
slab_free_hook(s, x);
|
||||
|
||||
redo:
|
||||
|
||||
/*
|
||||
* Determine the currently cpus per cpu slab.
|
||||
* The cpu may change afterward. However that does not matter since
|
||||
|
|
@ -2685,7 +2817,7 @@ static void early_kmem_cache_node_alloc(int node)
|
|||
n = page->freelist;
|
||||
BUG_ON(!n);
|
||||
page->freelist = get_freepointer(kmem_cache_node, n);
|
||||
page->inuse++;
|
||||
page->inuse = 1;
|
||||
page->frozen = 0;
|
||||
kmem_cache_node->node[node] = n;
|
||||
#ifdef CONFIG_SLUB_DEBUG
|
||||
|
|
@ -2695,7 +2827,7 @@ static void early_kmem_cache_node_alloc(int node)
|
|||
init_kmem_cache_node(n, kmem_cache_node);
|
||||
inc_slabs_node(kmem_cache_node, node, page->objects);
|
||||
|
||||
add_partial(n, page, 0);
|
||||
add_partial(n, page, DEACTIVATE_TO_HEAD);
|
||||
}
|
||||
|
||||
static void free_kmem_cache_nodes(struct kmem_cache *s)
|
||||
|
|
@ -2911,7 +3043,34 @@ static int kmem_cache_open(struct kmem_cache *s,
|
|||
* The larger the object size is, the more pages we want on the partial
|
||||
* list to avoid pounding the page allocator excessively.
|
||||
*/
|
||||
set_min_partial(s, ilog2(s->size));
|
||||
set_min_partial(s, ilog2(s->size) / 2);
|
||||
|
||||
/*
|
||||
* cpu_partial determined the maximum number of objects kept in the
|
||||
* per cpu partial lists of a processor.
|
||||
*
|
||||
* Per cpu partial lists mainly contain slabs that just have one
|
||||
* object freed. If they are used for allocation then they can be
|
||||
* filled up again with minimal effort. The slab will never hit the
|
||||
* per node partial lists and therefore no locking will be required.
|
||||
*
|
||||
* This setting also determines
|
||||
*
|
||||
* A) The number of objects from per cpu partial slabs dumped to the
|
||||
* per node list when we reach the limit.
|
||||
* B) The number of objects in cpu partial slabs to extract from the
|
||||
* per node list when we run out of per cpu objects. We only fetch 50%
|
||||
* to keep some capacity around for frees.
|
||||
*/
|
||||
if (s->size >= PAGE_SIZE)
|
||||
s->cpu_partial = 2;
|
||||
else if (s->size >= 1024)
|
||||
s->cpu_partial = 6;
|
||||
else if (s->size >= 256)
|
||||
s->cpu_partial = 13;
|
||||
else
|
||||
s->cpu_partial = 30;
|
||||
|
||||
s->refcount = 1;
|
||||
#ifdef CONFIG_NUMA
|
||||
s->remote_node_defrag_ratio = 1000;
|
||||
|
|
@ -2970,13 +3129,13 @@ static void list_slab_objects(struct kmem_cache *s, struct page *page,
|
|||
|
||||
/*
|
||||
* Attempt to free all partial slabs on a node.
|
||||
* This is called from kmem_cache_close(). We must be the last thread
|
||||
* using the cache and therefore we do not need to lock anymore.
|
||||
*/
|
||||
static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n)
|
||||
{
|
||||
unsigned long flags;
|
||||
struct page *page, *h;
|
||||
|
||||
spin_lock_irqsave(&n->list_lock, flags);
|
||||
list_for_each_entry_safe(page, h, &n->partial, lru) {
|
||||
if (!page->inuse) {
|
||||
remove_partial(n, page);
|
||||
|
|
@ -2986,7 +3145,6 @@ static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n)
|
|||
"Objects remaining on kmem_cache_close()");
|
||||
}
|
||||
}
|
||||
spin_unlock_irqrestore(&n->list_lock, flags);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -3020,6 +3178,7 @@ void kmem_cache_destroy(struct kmem_cache *s)
|
|||
s->refcount--;
|
||||
if (!s->refcount) {
|
||||
list_del(&s->list);
|
||||
up_write(&slub_lock);
|
||||
if (kmem_cache_close(s)) {
|
||||
printk(KERN_ERR "SLUB %s: %s called for cache that "
|
||||
"still has objects.\n", s->name, __func__);
|
||||
|
|
@ -3028,8 +3187,8 @@ void kmem_cache_destroy(struct kmem_cache *s)
|
|||
if (s->flags & SLAB_DESTROY_BY_RCU)
|
||||
rcu_barrier();
|
||||
sysfs_slab_remove(s);
|
||||
}
|
||||
up_write(&slub_lock);
|
||||
} else
|
||||
up_write(&slub_lock);
|
||||
}
|
||||
EXPORT_SYMBOL(kmem_cache_destroy);
|
||||
|
||||
|
|
@ -3347,23 +3506,23 @@ int kmem_cache_shrink(struct kmem_cache *s)
|
|||
* list_lock. page->inuse here is the upper limit.
|
||||
*/
|
||||
list_for_each_entry_safe(page, t, &n->partial, lru) {
|
||||
if (!page->inuse) {
|
||||
remove_partial(n, page);
|
||||
discard_slab(s, page);
|
||||
} else {
|
||||
list_move(&page->lru,
|
||||
slabs_by_inuse + page->inuse);
|
||||
}
|
||||
list_move(&page->lru, slabs_by_inuse + page->inuse);
|
||||
if (!page->inuse)
|
||||
n->nr_partial--;
|
||||
}
|
||||
|
||||
/*
|
||||
* Rebuild the partial list with the slabs filled up most
|
||||
* first and the least used slabs at the end.
|
||||
*/
|
||||
for (i = objects - 1; i >= 0; i--)
|
||||
for (i = objects - 1; i > 0; i--)
|
||||
list_splice(slabs_by_inuse + i, n->partial.prev);
|
||||
|
||||
spin_unlock_irqrestore(&n->list_lock, flags);
|
||||
|
||||
/* Release empty slabs */
|
||||
list_for_each_entry_safe(page, t, slabs_by_inuse, lru)
|
||||
discard_slab(s, page);
|
||||
}
|
||||
|
||||
kfree(slabs_by_inuse);
|
||||
|
|
@ -4319,6 +4478,7 @@ static ssize_t show_slab_objects(struct kmem_cache *s,
|
|||
|
||||
for_each_possible_cpu(cpu) {
|
||||
struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu);
|
||||
struct page *page;
|
||||
|
||||
if (!c || c->node < 0)
|
||||
continue;
|
||||
|
|
@ -4334,6 +4494,13 @@ static ssize_t show_slab_objects(struct kmem_cache *s,
|
|||
total += x;
|
||||
nodes[c->node] += x;
|
||||
}
|
||||
page = c->partial;
|
||||
|
||||
if (page) {
|
||||
x = page->pobjects;
|
||||
total += x;
|
||||
nodes[c->node] += x;
|
||||
}
|
||||
per_cpu[c->node]++;
|
||||
}
|
||||
}
|
||||
|
|
@ -4412,11 +4579,12 @@ struct slab_attribute {
|
|||
};
|
||||
|
||||
#define SLAB_ATTR_RO(_name) \
|
||||
static struct slab_attribute _name##_attr = __ATTR_RO(_name)
|
||||
static struct slab_attribute _name##_attr = \
|
||||
__ATTR(_name, 0400, _name##_show, NULL)
|
||||
|
||||
#define SLAB_ATTR(_name) \
|
||||
static struct slab_attribute _name##_attr = \
|
||||
__ATTR(_name, 0644, _name##_show, _name##_store)
|
||||
__ATTR(_name, 0600, _name##_show, _name##_store)
|
||||
|
||||
static ssize_t slab_size_show(struct kmem_cache *s, char *buf)
|
||||
{
|
||||
|
|
@ -4485,6 +4653,27 @@ static ssize_t min_partial_store(struct kmem_cache *s, const char *buf,
|
|||
}
|
||||
SLAB_ATTR(min_partial);
|
||||
|
||||
static ssize_t cpu_partial_show(struct kmem_cache *s, char *buf)
|
||||
{
|
||||
return sprintf(buf, "%u\n", s->cpu_partial);
|
||||
}
|
||||
|
||||
static ssize_t cpu_partial_store(struct kmem_cache *s, const char *buf,
|
||||
size_t length)
|
||||
{
|
||||
unsigned long objects;
|
||||
int err;
|
||||
|
||||
err = strict_strtoul(buf, 10, &objects);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
s->cpu_partial = objects;
|
||||
flush_all(s);
|
||||
return length;
|
||||
}
|
||||
SLAB_ATTR(cpu_partial);
|
||||
|
||||
static ssize_t ctor_show(struct kmem_cache *s, char *buf)
|
||||
{
|
||||
if (!s->ctor)
|
||||
|
|
@ -4523,6 +4712,37 @@ static ssize_t objects_partial_show(struct kmem_cache *s, char *buf)
|
|||
}
|
||||
SLAB_ATTR_RO(objects_partial);
|
||||
|
||||
static ssize_t slabs_cpu_partial_show(struct kmem_cache *s, char *buf)
|
||||
{
|
||||
int objects = 0;
|
||||
int pages = 0;
|
||||
int cpu;
|
||||
int len;
|
||||
|
||||
for_each_online_cpu(cpu) {
|
||||
struct page *page = per_cpu_ptr(s->cpu_slab, cpu)->partial;
|
||||
|
||||
if (page) {
|
||||
pages += page->pages;
|
||||
objects += page->pobjects;
|
||||
}
|
||||
}
|
||||
|
||||
len = sprintf(buf, "%d(%d)", objects, pages);
|
||||
|
||||
#ifdef CONFIG_SMP
|
||||
for_each_online_cpu(cpu) {
|
||||
struct page *page = per_cpu_ptr(s->cpu_slab, cpu) ->partial;
|
||||
|
||||
if (page && len < PAGE_SIZE - 20)
|
||||
len += sprintf(buf + len, " C%d=%d(%d)", cpu,
|
||||
page->pobjects, page->pages);
|
||||
}
|
||||
#endif
|
||||
return len + sprintf(buf + len, "\n");
|
||||
}
|
||||
SLAB_ATTR_RO(slabs_cpu_partial);
|
||||
|
||||
static ssize_t reclaim_account_show(struct kmem_cache *s, char *buf)
|
||||
{
|
||||
return sprintf(buf, "%d\n", !!(s->flags & SLAB_RECLAIM_ACCOUNT));
|
||||
|
|
@ -4845,6 +5065,8 @@ STAT_ATTR(DEACTIVATE_BYPASS, deactivate_bypass);
|
|||
STAT_ATTR(ORDER_FALLBACK, order_fallback);
|
||||
STAT_ATTR(CMPXCHG_DOUBLE_CPU_FAIL, cmpxchg_double_cpu_fail);
|
||||
STAT_ATTR(CMPXCHG_DOUBLE_FAIL, cmpxchg_double_fail);
|
||||
STAT_ATTR(CPU_PARTIAL_ALLOC, cpu_partial_alloc);
|
||||
STAT_ATTR(CPU_PARTIAL_FREE, cpu_partial_free);
|
||||
#endif
|
||||
|
||||
static struct attribute *slab_attrs[] = {
|
||||
|
|
@ -4853,6 +5075,7 @@ static struct attribute *slab_attrs[] = {
|
|||
&objs_per_slab_attr.attr,
|
||||
&order_attr.attr,
|
||||
&min_partial_attr.attr,
|
||||
&cpu_partial_attr.attr,
|
||||
&objects_attr.attr,
|
||||
&objects_partial_attr.attr,
|
||||
&partial_attr.attr,
|
||||
|
|
@ -4865,6 +5088,7 @@ static struct attribute *slab_attrs[] = {
|
|||
&destroy_by_rcu_attr.attr,
|
||||
&shrink_attr.attr,
|
||||
&reserved_attr.attr,
|
||||
&slabs_cpu_partial_attr.attr,
|
||||
#ifdef CONFIG_SLUB_DEBUG
|
||||
&total_objects_attr.attr,
|
||||
&slabs_attr.attr,
|
||||
|
|
@ -4906,6 +5130,8 @@ static struct attribute *slab_attrs[] = {
|
|||
&order_fallback_attr.attr,
|
||||
&cmpxchg_double_fail_attr.attr,
|
||||
&cmpxchg_double_cpu_fail_attr.attr,
|
||||
&cpu_partial_alloc_attr.attr,
|
||||
&cpu_partial_free_attr.attr,
|
||||
#endif
|
||||
#ifdef CONFIG_FAILSLAB
|
||||
&failslab_attr.attr,
|
||||
|
|
@ -5257,7 +5483,7 @@ static const struct file_operations proc_slabinfo_operations = {
|
|||
|
||||
static int __init slab_proc_init(void)
|
||||
{
|
||||
proc_create("slabinfo", S_IRUGO, NULL, &proc_slabinfo_operations);
|
||||
proc_create("slabinfo", S_IRUSR, NULL, &proc_slabinfo_operations);
|
||||
return 0;
|
||||
}
|
||||
module_init(slab_proc_init);
|
||||
|
|
|
|||
|
|
@ -42,6 +42,7 @@ struct slabinfo {
|
|||
unsigned long deactivate_remote_frees, order_fallback;
|
||||
unsigned long cmpxchg_double_cpu_fail, cmpxchg_double_fail;
|
||||
unsigned long alloc_node_mismatch, deactivate_bypass;
|
||||
unsigned long cpu_partial_alloc, cpu_partial_free;
|
||||
int numa[MAX_NODES];
|
||||
int numa_partial[MAX_NODES];
|
||||
} slabinfo[MAX_SLABS];
|
||||
|
|
@ -455,6 +456,11 @@ static void slab_stats(struct slabinfo *s)
|
|||
s->alloc_from_partial * 100 / total_alloc,
|
||||
s->free_remove_partial * 100 / total_free);
|
||||
|
||||
printf("Cpu partial list %8lu %8lu %3lu %3lu\n",
|
||||
s->cpu_partial_alloc, s->cpu_partial_free,
|
||||
s->cpu_partial_alloc * 100 / total_alloc,
|
||||
s->cpu_partial_free * 100 / total_free);
|
||||
|
||||
printf("RemoteObj/SlabFrozen %8lu %8lu %3lu %3lu\n",
|
||||
s->deactivate_remote_frees, s->free_frozen,
|
||||
s->deactivate_remote_frees * 100 / total_alloc,
|
||||
|
|
@ -1145,7 +1151,7 @@ static void read_slab_dir(void)
|
|||
switch (de->d_type) {
|
||||
case DT_LNK:
|
||||
alias->name = strdup(de->d_name);
|
||||
count = readlink(de->d_name, buffer, sizeof(buffer));
|
||||
count = readlink(de->d_name, buffer, sizeof(buffer)-1);
|
||||
|
||||
if (count < 0)
|
||||
fatal("Cannot read symlink %s\n", de->d_name);
|
||||
|
|
@ -1209,6 +1215,8 @@ static void read_slab_dir(void)
|
|||
slab->order_fallback = get_obj("order_fallback");
|
||||
slab->cmpxchg_double_cpu_fail = get_obj("cmpxchg_double_cpu_fail");
|
||||
slab->cmpxchg_double_fail = get_obj("cmpxchg_double_fail");
|
||||
slab->cpu_partial_alloc = get_obj("cpu_partial_alloc");
|
||||
slab->cpu_partial_free = get_obj("cpu_partial_free");
|
||||
slab->alloc_node_mismatch = get_obj("alloc_node_mismatch");
|
||||
slab->deactivate_bypass = get_obj("deactivate_bypass");
|
||||
chdir("..");
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user