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Linux 3.12 compat: shrinker semantics

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The new shrinker API as of Linux 3.12 modifies "struct shrinker" by
replacing the @shrink callback with the pair of @count_objects and
@scan_objects.  It also requires the return value of @count_objects to
return the number of objects actually freed whereas the previous @shrink
callback returned the number of remaining freeable objects.

This patch adds support for the new @scan_objects return value semantics
and updates the splat shrinker test case appropriately.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tim Chase <tim@chase2k.com>
Closes #403
This commit is contained in:
Tim Chase
2014-10-02 07:40:05 -05:00
committed by Brian Behlendorf
parent 46c936756e
commit 802a4a2ad5
3 changed files with 57 additions and 25 deletions
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include/linux/mm_compat.h
+7
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@@ -199,4 +199,11 @@ fn ## _scan_objects(struct shrinker *shrink, struct shrink_control *sc) \
#error "Unknown shrinker callback"
#endif
#if defined(HAVE_SPLIT_SHRINKER_CALLBACK)
typedef unsigned long spl_shrinker_t;
#else
typedef int spl_shrinker_t;
#define SHRINK_STOP (-1)
#endif
#endif /* SPL_MM_COMPAT_H */