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[PATCH] mm: free_pages_and_swap_cache opt

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Minor optimization (though it doesn't help in the PREEMPT case, severely
constrained by small ZAP_BLOCK_SIZE).  free_pages_and_swap_cache works in
chunks of 16, calling release_pages which works in chunks of PAGEVEC_SIZE.
But PAGEVEC_SIZE was dropped from 16 to 14 in 2.6.10, so we're now doing more
spin_lock_irq'ing than necessary: use PAGEVEC_SIZE throughout.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hugh Dickins 2006-01-06 00:10:55 -08:00 committed by Linus Torvalds
parent 161599ff39
commit c484d41042
1 changed files with 2 additions and 2 deletions
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4
mm/swap_state.c
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@ -14,6 +14,7 @@
#include <linux/pagemap.h>
#include <linux/buffer_head.h>
#include <linux/backing-dev.h>
#include <linux/pagevec.h>
#include <asm/pgtable.h>
@ -272,12 +273,11 @@ void free_page_and_swap_cache(struct page *page)
*/
void free_pages_and_swap_cache(struct page **pages, int nr)
{
int chunk = 16;
struct page **pagep = pages;
lru_add_drain();
while (nr) {
int todo = min(chunk, nr);
int todo = min(nr, PAGEVEC_SIZE);
int i;
for (i = 0; i < todo; i++)