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| author | Wu Fengguang <fengguang.wu@intel.com> | 2010-08-11 14:17:39 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-12 08:43:29 -0700 |
| commit | 16c4042f08919f447d6b2a55679546c9b97c7264 (patch) | |
| tree | 0248b64d46237854ebe67efe8c742cb5878d8611 /include/linux/writeback.h | |
| parent | e50e37201ae2e7d6a52e87815759e6481f0bcfb9 (diff) | |
| download | lwn-16c4042f08919f447d6b2a55679546c9b97c7264.tar.gz lwn-16c4042f08919f447d6b2a55679546c9b97c7264.zip | |
writeback: avoid unnecessary calculation of bdi dirty thresholds
Split get_dirty_limits() into global_dirty_limits()+bdi_dirty_limit(), so
that the latter can be avoided when under global dirty background
threshold (which is the normal state for most systems).
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/writeback.h')
| -rw-r--r-- | include/linux/writeback.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/include/linux/writeback.h b/include/linux/writeback.h index c24eca71e80c..72a5d647a5f2 100644 --- a/include/linux/writeback.h +++ b/include/linux/writeback.h @@ -124,8 +124,9 @@ struct ctl_table; int dirty_writeback_centisecs_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); -void get_dirty_limits(unsigned long *pbackground, unsigned long *pdirty, - unsigned long *pbdi_dirty, struct backing_dev_info *bdi); +void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty); +unsigned long bdi_dirty_limit(struct backing_dev_info *bdi, + unsigned long dirty); void page_writeback_init(void); void balance_dirty_pages_ratelimited_nr(struct address_space *mapping, |