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[PATCH] count bounce buffer pages in vmstat

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This is a patch for counting the number of pages for bounce buffers.  It's
shown in /proc/vmstat.

Currently, the number of bounce pages are not counted anywhere.  So, if
there are many bounce pages, it seems that there are leaked pages.  And
it's difficult for a user to imagine the usage of bounce pages.  So, it's
meaningful to show # of bouce pages.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
KAMEZAWA Hiroyuki 2005-05-01 08:58:37 -07:00 committed by Linus Torvalds
parent 2054606ad6
commit edfbe2b003
3 changed files with 4 additions and 0 deletions
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1
include/linux/page-flags.h
View File

@ -131,6 +131,7 @@ struct page_state {
unsigned long allocstall; /* direct reclaim calls */
unsigned long pgrotated; /* pages rotated to tail of the LRU */
unsigned long nr_bounce; /* pages for bounce buffers */
};
extern void get_page_state(struct page_state *ret);

2
mm/highmem.c
View File

@ -325,6 +325,7 @@ static void bounce_end_io(struct bio *bio, mempool_t *pool, int err)
continue;
mempool_free(bvec->bv_page, pool);
dec_page_state(nr_bounce);
}
bio_endio(bio_orig, bio_orig->bi_size, err);
@ -405,6 +406,7 @@ static void __blk_queue_bounce(request_queue_t *q, struct bio **bio_orig,
to->bv_page = mempool_alloc(pool, q->bounce_gfp);
to->bv_len = from->bv_len;
to->bv_offset = from->bv_offset;
inc_page_state(nr_bounce);
if (rw == WRITE) {
char *vto, *vfrom;

1
mm/page_alloc.c
View File

@ -1897,6 +1897,7 @@ static char *vmstat_text[] = {
"allocstall",
"pgrotated",
"nr_bounce",
};
static void *vmstat_start(struct seq_file *m, loff_t *pos)