forked from luck/tmp_suning_uos_patched
fc2acab31b
zap_pte_range has been counting the pages it frees in tlb->freed, then tlb_finish_mmu has used that to update the mm's rss. That got stranger when I added anon_rss, yet updated it by a different route; and stranger when rss and anon_rss became mm_counters with special access macros. And it would no longer be viable if we're relying on page_table_lock to stabilize the mm_counter, but calling tlb_finish_mmu outside that lock. Remove the mmu_gather's freed field, let tlb_finish_mmu stick to its own business, just decrement the rss mm_counter in zap_pte_range (yes, there was some point to batching the update, and a subsequent patch restores that). And forget the anal paranoia of first reading the counter to avoid going negative - if rss does go negative, just fix that bug. Remove the mmu_gather's flushes and avoided_flushes from arm and arm26: no use was being made of them. But arm26 alone was actually using the freed, in the way some others use need_flush: give it a need_flush. arm26 seems to prefer spaces to tabs here: respect that. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
#ifndef _SPARC64_TLB_H
|
|
#define _SPARC64_TLB_H
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/swap.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/mmu_context.h>
|
|
|
|
#define TLB_BATCH_NR 192
|
|
|
|
/*
|
|
* For UP we don't need to worry about TLB flush
|
|
* and page free order so much..
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
#define FREE_PTE_NR 506
|
|
#define tlb_fast_mode(bp) ((bp)->pages_nr == ~0U)
|
|
#else
|
|
#define FREE_PTE_NR 1
|
|
#define tlb_fast_mode(bp) 1
|
|
#endif
|
|
|
|
struct mmu_gather {
|
|
struct mm_struct *mm;
|
|
unsigned int pages_nr;
|
|
unsigned int need_flush;
|
|
unsigned int fullmm;
|
|
unsigned int tlb_nr;
|
|
unsigned long vaddrs[TLB_BATCH_NR];
|
|
struct page *pages[FREE_PTE_NR];
|
|
};
|
|
|
|
DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
|
|
|
|
#ifdef CONFIG_SMP
|
|
extern void smp_flush_tlb_pending(struct mm_struct *,
|
|
unsigned long, unsigned long *);
|
|
#endif
|
|
|
|
extern void __flush_tlb_pending(unsigned long, unsigned long, unsigned long *);
|
|
extern void flush_tlb_pending(void);
|
|
|
|
static inline struct mmu_gather *tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
|
|
{
|
|
struct mmu_gather *mp = &get_cpu_var(mmu_gathers);
|
|
|
|
BUG_ON(mp->tlb_nr);
|
|
|
|
mp->mm = mm;
|
|
mp->pages_nr = num_online_cpus() > 1 ? 0U : ~0U;
|
|
mp->fullmm = full_mm_flush;
|
|
|
|
return mp;
|
|
}
|
|
|
|
|
|
static inline void tlb_flush_mmu(struct mmu_gather *mp)
|
|
{
|
|
if (mp->need_flush) {
|
|
mp->need_flush = 0;
|
|
if (!tlb_fast_mode(mp)) {
|
|
free_pages_and_swap_cache(mp->pages, mp->pages_nr);
|
|
mp->pages_nr = 0;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
extern void smp_flush_tlb_mm(struct mm_struct *mm);
|
|
#define do_flush_tlb_mm(mm) smp_flush_tlb_mm(mm)
|
|
#else
|
|
#define do_flush_tlb_mm(mm) __flush_tlb_mm(CTX_HWBITS(mm->context), SECONDARY_CONTEXT)
|
|
#endif
|
|
|
|
static inline void tlb_finish_mmu(struct mmu_gather *mp, unsigned long start, unsigned long end)
|
|
{
|
|
tlb_flush_mmu(mp);
|
|
|
|
if (mp->fullmm) {
|
|
if (CTX_VALID(mp->mm->context))
|
|
do_flush_tlb_mm(mp->mm);
|
|
mp->fullmm = 0;
|
|
} else
|
|
flush_tlb_pending();
|
|
|
|
/* keep the page table cache within bounds */
|
|
check_pgt_cache();
|
|
|
|
put_cpu_var(mmu_gathers);
|
|
}
|
|
|
|
static inline void tlb_remove_page(struct mmu_gather *mp, struct page *page)
|
|
{
|
|
mp->need_flush = 1;
|
|
if (tlb_fast_mode(mp)) {
|
|
free_page_and_swap_cache(page);
|
|
return;
|
|
}
|
|
mp->pages[mp->pages_nr++] = page;
|
|
if (mp->pages_nr >= FREE_PTE_NR)
|
|
tlb_flush_mmu(mp);
|
|
}
|
|
|
|
#define tlb_remove_tlb_entry(mp,ptep,addr) do { } while (0)
|
|
#define pte_free_tlb(mp,ptepage) pte_free(ptepage)
|
|
#define pmd_free_tlb(mp,pmdp) pmd_free(pmdp)
|
|
#define pud_free_tlb(tlb,pudp) __pud_free_tlb(tlb,pudp)
|
|
|
|
#define tlb_migrate_finish(mm) do { } while (0)
|
|
#define tlb_start_vma(tlb, vma) do { } while (0)
|
|
#define tlb_end_vma(tlb, vma) do { } while (0)
|
|
|
|
#endif /* _SPARC64_TLB_H */
|