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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2011-05-24 17:12:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-25 08:39:16 -0700
commite303297e6c3a7b847c4731eb14006ca6b435ecca (patch)
treec2bbec8fb0cad1405f4a3ff908cd1d22abcd3e77
parent267239116987d64850ad2037d8e0f3071dc3b5ce (diff)
downloadlinaro-lsk-e303297e6c3a7b847c4731eb14006ca6b435ecca.tar.gz
mm: extended batches for generic mmu_gather
Instead of using a single batch (the small on-stack, or an allocated page), try and extend the batch every time it runs out and only flush once either the extend fails or we're done. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Requested-by: Nick Piggin <npiggin@kernel.dk> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Hugh Dickins <hughd@google.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: David Miller <davem@davemloft.net> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Tony Luck <tony.luck@intel.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/asm-generic/tlb.h129
-rw-r--r--mm/memory.c2
2 files changed, 84 insertions, 47 deletions
diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
index 74f80f6b6cf..5a946a08ff9 100644
--- a/include/asm-generic/tlb.h
+++ b/include/asm-generic/tlb.h
@@ -19,16 +19,6 @@
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
-/*
- * For UP we don't need to worry about TLB flush
- * and page free order so much..
- */
-#ifdef CONFIG_SMP
- #define tlb_fast_mode(tlb) ((tlb)->nr == ~0U)
-#else
- #define tlb_fast_mode(tlb) 1
-#endif
-
#ifdef CONFIG_HAVE_RCU_TABLE_FREE
/*
* Semi RCU freeing of the page directories.
@@ -78,6 +68,16 @@ extern void tlb_remove_table(struct mmu_gather *tlb, void *table);
*/
#define MMU_GATHER_BUNDLE 8
+struct mmu_gather_batch {
+ struct mmu_gather_batch *next;
+ unsigned int nr;
+ unsigned int max;
+ struct page *pages[0];
+};
+
+#define MAX_GATHER_BATCH \
+ ((PAGE_SIZE - sizeof(struct mmu_gather_batch)) / sizeof(void *))
+
/* struct mmu_gather is an opaque type used by the mm code for passing around
* any data needed by arch specific code for tlb_remove_page.
*/
@@ -86,22 +86,48 @@ struct mmu_gather {
#ifdef CONFIG_HAVE_RCU_TABLE_FREE
struct mmu_table_batch *batch;
#endif
- unsigned int nr; /* set to ~0U means fast mode */
- unsigned int max; /* nr < max */
- unsigned int need_flush;/* Really unmapped some ptes? */
- unsigned int fullmm; /* non-zero means full mm flush */
- struct page **pages;
- struct page *local[MMU_GATHER_BUNDLE];
+ unsigned int need_flush : 1, /* Did free PTEs */
+ fast_mode : 1; /* No batching */
+
+ unsigned int fullmm;
+
+ struct mmu_gather_batch *active;
+ struct mmu_gather_batch local;
+ struct page *__pages[MMU_GATHER_BUNDLE];
};
-static inline void __tlb_alloc_page(struct mmu_gather *tlb)
+/*
+ * For UP we don't need to worry about TLB flush
+ * and page free order so much..
+ */
+#ifdef CONFIG_SMP
+ #define tlb_fast_mode(tlb) (tlb->fast_mode)
+#else
+ #define tlb_fast_mode(tlb) 1
+#endif
+
+static inline int tlb_next_batch(struct mmu_gather *tlb)
{
- unsigned long addr = __get_free_pages(GFP_NOWAIT | __GFP_NOWARN, 0);
+ struct mmu_gather_batch *batch;
- if (addr) {
- tlb->pages = (void *)addr;
- tlb->max = PAGE_SIZE / sizeof(struct page *);
+ batch = tlb->active;
+ if (batch->next) {
+ tlb->active = batch->next;
+ return 1;
}
+
+ batch = (void *)__get_free_pages(GFP_NOWAIT | __GFP_NOWARN, 0);
+ if (!batch)
+ return 0;
+
+ batch->next = NULL;
+ batch->nr = 0;
+ batch->max = MAX_GATHER_BATCH;
+
+ tlb->active->next = batch;
+ tlb->active = batch;
+
+ return 1;
}
/* tlb_gather_mmu
@@ -114,16 +140,13 @@ tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, bool fullmm)
{
tlb->mm = mm;
- tlb->max = ARRAY_SIZE(tlb->local);
- tlb->pages = tlb->local;
-
- if (num_online_cpus() > 1) {
- tlb->nr = 0;
- __tlb_alloc_page(tlb);
- } else /* Use fast mode if only one CPU is online */
- tlb->nr = ~0U;
-
- tlb->fullmm = fullmm;
+ tlb->fullmm = fullmm;
+ tlb->need_flush = 0;
+ tlb->fast_mode = (num_possible_cpus() == 1);
+ tlb->local.next = NULL;
+ tlb->local.nr = 0;
+ tlb->local.max = ARRAY_SIZE(tlb->__pages);
+ tlb->active = &tlb->local;
#ifdef CONFIG_HAVE_RCU_TABLE_FREE
tlb->batch = NULL;
@@ -133,6 +156,8 @@ tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, bool fullmm)
static inline void
tlb_flush_mmu(struct mmu_gather *tlb)
{
+ struct mmu_gather_batch *batch;
+
if (!tlb->need_flush)
return;
tlb->need_flush = 0;
@@ -140,17 +165,15 @@ tlb_flush_mmu(struct mmu_gather *tlb)
#ifdef CONFIG_HAVE_RCU_TABLE_FREE
tlb_table_flush(tlb);
#endif
- if (!tlb_fast_mode(tlb)) {
- free_pages_and_swap_cache(tlb->pages, tlb->nr);
- tlb->nr = 0;
- /*
- * If we are using the local on-stack array of pages for MMU
- * gather, try allocating an off-stack array again as we have
- * recently freed pages.
- */
- if (tlb->pages == tlb->local)
- __tlb_alloc_page(tlb);
+
+ if (tlb_fast_mode(tlb))
+ return;
+
+ for (batch = &tlb->local; batch; batch = batch->next) {
+ free_pages_and_swap_cache(batch->pages, batch->nr);
+ batch->nr = 0;
}
+ tlb->active = &tlb->local;
}
/* tlb_finish_mmu
@@ -160,13 +183,18 @@ tlb_flush_mmu(struct mmu_gather *tlb)
static inline void
tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
{
+ struct mmu_gather_batch *batch, *next;
+
tlb_flush_mmu(tlb);
/* keep the page table cache within bounds */
check_pgt_cache();
- if (tlb->pages != tlb->local)
- free_pages((unsigned long)tlb->pages, 0);
+ for (batch = tlb->local.next; batch; batch = next) {
+ next = batch->next;
+ free_pages((unsigned long)batch, 0);
+ }
+ tlb->local.next = NULL;
}
/* __tlb_remove_page
@@ -177,15 +205,24 @@ tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
*/
static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
+ struct mmu_gather_batch *batch;
+
tlb->need_flush = 1;
+
if (tlb_fast_mode(tlb)) {
free_page_and_swap_cache(page);
return 1; /* avoid calling tlb_flush_mmu() */
}
- tlb->pages[tlb->nr++] = page;
- VM_BUG_ON(tlb->nr > tlb->max);
- return tlb->max - tlb->nr;
+ batch = tlb->active;
+ batch->pages[batch->nr++] = page;
+ VM_BUG_ON(batch->nr > batch->max);
+ if (batch->nr == batch->max) {
+ if (!tlb_next_batch(tlb))
+ return 0;
+ }
+
+ return batch->max - batch->nr;
}
/* tlb_remove_page
diff --git a/mm/memory.c b/mm/memory.c
index a77fd23ee68..17193d74f30 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -994,8 +994,8 @@ static unsigned long zap_pte_range(struct mmu_gather *tlb,
spinlock_t *ptl;
int rss[NR_MM_COUNTERS];
- init_rss_vec(rss);
again:
+ init_rss_vec(rss);
pte = pte_offset_map_lock(mm, pmd, addr, &ptl);
arch_enter_lazy_mmu_mode();
do {