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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 /fs/buffer.c | |
| parent | 8c08540f8755c451d8b96ea14cfe796bc3cd712d (diff) | |
| download | lwn-55e829af06681e5d731c03ba04febbd1c76ca293.tar.gz lwn-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 'fs/buffer.c')
| -rw-r--r-- | fs/buffer.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/buffer.c b/fs/buffer.c index 865570fe0d39..904d59d1eb8e 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -35,6 +35,7 @@ #include <linux/hash.h> #include <linux/suspend.h> #include <linux/buffer_head.h> +#include <linux/task_io_accounting_ops.h> #include <linux/bio.h> #include <linux/notifier.h> #include <linux/cpu.h> @@ -729,8 +730,10 @@ int __set_page_dirty_buffers(struct page *page) write_lock_irq(&mapping->tree_lock); if (page->mapping) { /* Race with truncate? */ - 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); } |