diff options
| author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2005-05-01 15:58:37 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-05-01 15:58:37 (GMT) |
| commit | edfbe2b0038723e5699ab22695ccd62b5542a5c1 (patch) | |
| tree | f1c613d32824f274b0e3daf492e87b0c9051c789 | |
| parent | 2054606ad6dd6fee559fe790f190b15ed9355237 (diff) | |
| download | linux-fsl-qoriq-edfbe2b0038723e5699ab22695ccd62b5542a5c1.tar.xz | |
[PATCH] count bounce buffer pages in vmstat
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>
| -rw-r--r-- | include/linux/page-flags.h | 1 | ||||
| -rw-r--r-- | mm/highmem.c | 2 | ||||
| -rw-r--r-- | mm/page_alloc.c | 1 |
3 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 6b74fcf..39ab8c6 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -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); diff --git a/mm/highmem.c b/mm/highmem.c index d012765..4009115 100644 --- a/mm/highmem.c +++ b/mm/highmem.c @@ -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; diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 04a35b3..80ce7f2 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1897,6 +1897,7 @@ static char *vmstat_text[] = { "allocstall", "pgrotated", + "nr_bounce", }; static void *vmstat_start(struct seq_file *m, loff_t *pos) |