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| author | Andrew Morton <akpm@osdl.org> | 2006-12-10 02:19:27 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-10 09:55:41 -0800 |
| commit | 55e829af06681e5d731c03ba04febbd1c76ca293 (patch) | |
| tree | 4304030be250d913f56696ffda8ae660fb17b110 /mm | |
| parent | 8c08540f8755c451d8b96ea14cfe796bc3cd712d (diff) | |
| download | linux-stable-55e829af06681e5d731c03ba04febbd1c76ca293.tar.gz linux-stable-55e829af06681e5d731c03ba04febbd1c76ca293.tar.bz2 linux-stable-55e829af06681e5d731c03ba04febbd1c76ca293.zip | |
[PATCH] io-accounting: write accounting
Accounting writes is fairly simple: whenever a process flips a page from clean
to dirty, we accuse it of having caused a write to underlying storage of
PAGE_CACHE_SIZE bytes.
This may overestimate the amount of writing: the page-dirtying may cause only
one buffer_head's worth of writeout. Fixing that is possible, but probably a
bit messy and isn't obviously important.
Cc: Jay Lan <jlan@sgi.com>
Cc: Shailabh Nagar <nagar@watson.ibm.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Chris Sturtivant <csturtiv@sgi.com>
Cc: Tony Ernst <tee@sgi.com>
Cc: Guillaume Thouvenin <guillaume.thouvenin@bull.net>
Cc: David Wright <daw@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/page-writeback.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 59ffcdbde8b3..237107c1b084 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -21,6 +21,7 @@ #include <linux/writeback.h> #include <linux/init.h> #include <linux/backing-dev.h> +#include <linux/task_io_accounting_ops.h> #include <linux/blkdev.h> #include <linux/mpage.h> #include <linux/rmap.h> @@ -768,8 +769,10 @@ int __set_page_dirty_nobuffers(struct page *page) mapping2 = page_mapping(page); if (mapping2) { /* Race with truncate? */ BUG_ON(mapping2 != mapping); - if (mapping_cap_account_dirty(mapping)) + if (mapping_cap_account_dirty(mapping)) { __inc_zone_page_state(page, NR_FILE_DIRTY); + task_io_account_write(PAGE_CACHE_SIZE); + } radix_tree_tag_set(&mapping->page_tree, page_index(page), PAGECACHE_TAG_DIRTY); } |