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| author | Wu Fengguang <fengguang.wu@intel.com> | 2011-03-02 17:14:34 -0600 |
|---|---|---|
| committer | Wu Fengguang <fengguang.wu@intel.com> | 2011-06-08 08:25:22 +0800 |
| commit | 6f7186562771ec9b629914df328048449ccddf4a (patch) | |
| tree | 573a5550c80843373fac6f95f7ef767d92cb83f6 /mm/page-writeback.c | |
| parent | e185dda89d69cde142b48059413a03561f41f78a (diff) | |
| download | lwn-6f7186562771ec9b629914df328048449ccddf4a.tar.gz lwn-6f7186562771ec9b629914df328048449ccddf4a.zip | |
writeback: add bdi_dirty_limit() kernel-doc
Clarify the bdi_dirty_limit() comment.
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Diffstat (limited to 'mm/page-writeback.c')
| -rw-r--r-- | mm/page-writeback.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 955fe35d01e0..b8be62381396 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -437,10 +437,17 @@ void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty) *pdirty = dirty; } -/* +/** * bdi_dirty_limit - @bdi's share of dirty throttling threshold + * @bdi: the backing_dev_info to query + * @dirty: global dirty limit in pages + * + * Returns @bdi's dirty limit in pages. The term "dirty" in the context of + * dirty balancing includes all PG_dirty, PG_writeback and NFS unstable pages. + * And the "limit" in the name is not seriously taken as hard limit in + * balance_dirty_pages(). * - * Allocate high/low dirty limits to fast/slow devices, in order to prevent + * It allocates high/low dirty limits to fast/slow devices, in order to prevent * - starving fast devices * - piling up dirty pages (that will take long time to sync) on slow devices * |