kernel_optimize_test/mm
Jens Axboe 9491ae4aad mm: don't cap request size based on read-ahead setting
We ran into a funky issue, where someone doing 256K buffered reads saw
128K requests at the device level.  Turns out it is read-ahead capping
the request size, since we use 128K as the default setting.  This
doesn't make a lot of sense - if someone is issuing 256K reads, they
should see 256K reads, regardless of the read-ahead setting, if the
underlying device can support a 256K read in a single command.

This patch introduces a bdi hint, io_pages.  This is the soft max IO
size for the lower level, I've hooked it up to the bdev settings here.
Read-ahead is modified to issue the maximum of the user request size,
and the read-ahead max size, but capped to the max request size on the
device side.  The latter is done to avoid reading ahead too much, if the
application asks for a huge read.  With this patch, the kernel behaves
like the application expects.

Link: http://lkml.kernel.org/r/1479498073-8657-1-git-send-email-axboe@fb.com
Signed-off-by: Jens Axboe <axboe@fb.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-12-12 18:55:08 -08:00
..
kasan kasan: support use-after-scope detection 2016-11-30 16:32:52 -08:00
backing-dev.c
balloon_compaction.c
bootmem.c
cleancache.c
cma_debug.c
cma.c mm/cma.c: check the max limit for cma allocation 2016-11-11 08:12:37 -08:00
cma.h
compaction.c mm, compaction: fix NR_ISOLATED_* stats for pfn based migration 2016-12-12 18:55:07 -08:00
debug_page_ref.c
debug.c
dmapool.c
early_ioremap.c
fadvise.c
failslab.c
filemap.c mm/filemap.c: add comment for confusing logic in page_cache_tree_insert() 2016-12-12 18:55:08 -08:00
frame_vector.c
frontswap.c
gup.c mm: fix up get_user_pages* comments 2016-12-12 18:55:07 -08:00
highmem.c
huge_memory.c mm: add tlb_remove_check_page_size_change to track page size change 2016-12-12 18:55:07 -08:00
hugetlb_cgroup.c
hugetlb.c mm: add tlb_remove_check_page_size_change to track page size change 2016-12-12 18:55:07 -08:00
hwpoison-inject.c
init-mm.c
internal.h
interval_tree.c
Kconfig of/fdt: mark hotpluggable memory 2016-12-12 18:55:07 -08:00
Kconfig.debug
khugepaged.c mm, thp: propagation of conditional compilation in khugepaged.c 2016-11-30 16:32:52 -08:00
kmemcheck.c
kmemleak-test.c
kmemleak.c kmemleak: fix reference to Documentation 2016-12-12 18:55:07 -08:00
ksm.c
list_lru.c
maccess.c
madvise.c mm: add tlb_remove_check_page_size_change to track page size change 2016-12-12 18:55:07 -08:00
Makefile
memblock.c
memcontrol.c mm: memcontrol: use special workqueue for creating per-memcg caches 2016-12-12 18:55:06 -08:00
memory_hotplug.c mm: remove x86-only restriction of movable_node 2016-12-12 18:55:07 -08:00
memory-failure.c mm: hwpoison: fix thp split handling in memory_failure() 2016-11-11 08:12:37 -08:00
memory.c mm: remove the page size change check in tlb_remove_page 2016-12-12 18:55:07 -08:00
mempolicy.c mm/mempolicy.c: forbid static or relative flags for local NUMA mode 2016-12-12 18:55:07 -08:00
mempool.c
memtest.c
migrate.c mm, compaction: fix NR_ISOLATED_* stats for pfn based migration 2016-12-12 18:55:07 -08:00
mincore.c
mlock.c thp: fix corner case of munlock() of PTE-mapped THPs 2016-11-30 16:32:52 -08:00
mm_init.c
mmap.c
mmu_context.c
mmu_notifier.c
mmzone.c
mprotect.c mm/pkeys: generate pkey system call code only if ARCH_HAS_PKEYS is selected 2016-12-12 18:55:07 -08:00
mremap.c mremap: move_ptes: check pte dirty after its removal 2016-11-29 08:20:24 -08:00
msync.c
nobootmem.c
nommu.c
oom_kill.c
page_alloc.c mm: make unreserve highatomic functions reliable 2016-12-12 18:55:07 -08:00
page_counter.c
page_ext.c
page_idle.c
page_io.c
page_isolation.c
page_owner.c
page_poison.c
page-writeback.c
pagewalk.c
percpu-km.c
percpu-vm.c
percpu.c
pgtable-generic.c
process_vm_access.c
quicklist.c
readahead.c mm: don't cap request size based on read-ahead setting 2016-12-12 18:55:08 -08:00
rmap.c
shmem.c shmem: fix compilation warnings on unused functions 2016-12-12 18:55:08 -08:00
slab_common.c mm/slab_common.c: check kmem_create_cache flags are common 2016-12-12 18:55:06 -08:00
slab.c mm, slab: maintain total slab count instead of active count 2016-12-12 18:55:07 -08:00
slab.h mm, slab: maintain total slab count instead of active count 2016-12-12 18:55:07 -08:00
slob.c slub: move synchronize_sched out of slab_mutex on shrink 2016-12-12 18:55:06 -08:00
slub.c slub: avoid false-postive warning 2016-12-12 18:55:06 -08:00
sparse-vmemmap.c
sparse.c
swap_cgroup.c
swap_state.c
swap.c
swapfile.c swapfile: fix memory corruption via malformed swapfile 2016-11-11 08:12:37 -08:00
truncate.c mm: fix false-positive WARN_ON() in truncate/invalidate for hugetlb 2016-11-30 16:32:52 -08:00
usercopy.c
userfaultfd.c
util.c
vmacache.c
vmalloc.c mm/vmalloc.c: simplify /proc/vmallocinfo implementation 2016-12-12 18:55:07 -08:00
vmpressure.c
vmscan.c mm/vmscan.c: set correct defer count for shrinker 2016-12-12 18:55:07 -08:00
vmstat.c
workingset.c mm: workingset: fix NULL ptr in count_shadow_nodes 2016-12-02 18:48:03 -08:00
z3fold.c
zbud.c
zpool.c
zsmalloc.c
zswap.c