From edfbe2b0038723e5699ab22695ccd62b5542a5c1 Mon Sep 17 00:00:00 2001 From: KAMEZAWA Hiroyuki Date: Sun, 1 May 2005 08:58:37 -0700 Subject: [PATCH] [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/page-flags.h | 1 + mm/highmem.c | 2 ++ mm/page_alloc.c | 1 + 3 files changed, 4 insertions(+) diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 6b74fcf5bb63..39ab8c6b5652 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 d01276506b00..400911599468 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 04a35b3d3262..80ce7f2104df 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)