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mm: add context argument to shrinker callback

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The current shrinker implementation requires the registered callback
to have global state to work from. This makes it difficult to shrink
caches that are not global (e.g. per-filesystem caches). Pass the shrinker
structure to the callback so that users can embed the shrinker structure
in the context the shrinker needs to operate on and get back to it in the
callback via container_of().

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Dave Chinner 2010-07-19 14:56:17 +10:00 • committed by Dave Chinner
parent d0c6f62584
commit 7f8275d0d6
18 changed files with 31 additions and 22 deletions
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2
include/linux/mm.h
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@ -999,7 +999,7 @@ static inline void sync_mm_rss(struct task_struct *task, struct mm_struct *mm)
* querying the cache size, so a fastpath for that case is appropriate.
*/
struct shrinker {
int (*shrink)(int nr_to_scan, gfp_t gfp_mask);
int (*shrink)(struct shrinker *, int nr_to_scan, gfp_t gfp_mask);
int seeks; /* seeks to recreate an obj */
/* These are for internal use */