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Linux shrinker compat

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The Linux shrinker has gone through three API changes since 2.6.22.
Rather than force every caller to understand all three APIs this
change consolidates the compatibility code in to the mm-compat.h
header.  The caller then can then use a single spl provided
shrinker API which does the right thing for your kernel.

SPL_SHRINKER_CALLBACK_PROTO(shrinker_callback, cb, nr_to_scan, gfp_mask);
SPL_SHRINKER_DECLARE(shrinker_struct, shrinker_callback, seeks);
spl_register_shrinker(&shrinker_struct);
spl_unregister_shrinker(&&shrinker_struct);
spl_exec_shrinker(&shrinker_struct, nr_to_scan, gfp_mask);
This commit is contained in:
Brian Behlendorf 2011-03-23 15:45:55 -07:00
parent 91cb1d91a4
commit 495bd532ab
2 changed files with 55 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
include/linux/mm_compat.h
View File

@ -56,4 +56,50 @@ extern invalidate_inodes_t invalidate_inodes_fn;
#define invalidate_inodes(sb) invalidate_inodes_fn(sb)
#endif /* HAVE_INVALIDATE_INODES */
#ifdef HAVE_SET_SHRINKER
typedef struct spl_shrinker {
struct shrinker *shrinker;
shrinker_t fn;
int seeks;
} spl_shrinker_t;
static inline void
spl_register_shrinker(spl_shrinker_t *ss)
{
ss->shrinker = set_shrinker(ss->seeks, ss->fn);
}
static inline void
spl_unregister_shrinker(spl_shrinker_t *ss)
{
remove_shrinker(ss->shrinker);
}
# define SPL_SHRINKER_DECLARE(s, x, y) \
static spl_shrinker_t s = { .shrinker = NULL, .fn = x, .seeks = y }
# define SPL_SHRINKER_CALLBACK_PROTO(fn, x, y, z) \
static int fn(int y, unsigned int z)
# define spl_exec_shrinker(ss, nr, gfp) \
((spl_shrinker_t *)ss)->fn(nr, gfp)
#else /* HAVE_SET_SHRINKER */
# define spl_register_shrinker(x) register_shrinker(x)
# define spl_unregister_shrinker(x) unregister_shrinker(x)
# define SPL_SHRINKER_DECLARE(s, x, y) \
static struct shrinker s = { .shrink = x, .seeks = y }
# ifdef HAVE_3ARGS_SHRINKER_CALLBACK
# define SPL_SHRINKER_CALLBACK_PROTO(fn, x, y, z) \
static int fn(struct shrinker *x, int y, unsigned int z)
# define spl_exec_shrinker(ss, nr, gfp) \
((struct shrinker *)ss)->shrink(NULL, nr, gfp)
# else /* HAVE_3ARGS_SHRINKER_CALLBACK */
# define SPL_SHRINKER_CALLBACK_PROTO(fn, x, y, z) \
static int fn(int y, unsigned int z)
# define spl_exec_shrinker(ss, nr, gfp) \
((struct shrinker *)ss)->shrink(nr, gfp)
# endif /* HAVE_3ARGS_SHRINKER_CALLBACK */
#endif /* HAVE_SET_SHRINKER */
#endif /* SPL_MM_COMPAT_H */

50
module/spl/spl-kmem.c
View File

@ -819,21 +819,10 @@ struct rw_semaphore spl_kmem_cache_sem; /* Cache list lock */
static int spl_cache_flush(spl_kmem_cache_t *skc,
spl_kmem_magazine_t *skm, int flush);
#ifdef HAVE_SET_SHRINKER
static struct shrinker *spl_kmem_cache_shrinker;
#else
# ifdef HAVE_3ARGS_SHRINKER_CALLBACK
static int spl_kmem_cache_generic_shrinker(struct shrinker *shrinker_cb,
int nr_to_scan, unsigned int gfp_mask);
# else
static int spl_kmem_cache_generic_shrinker(
int nr_to_scan, unsigned int gfp_mask);
# endif /* HAVE_3ARGS_SHRINKER_CALLBACK */
static struct shrinker spl_kmem_cache_shrinker = {
.shrink = spl_kmem_cache_generic_shrinker,
.seeks = KMC_DEFAULT_SEEKS,
};
#endif /* HAVE_SET_SHRINKER */
SPL_SHRINKER_CALLBACK_PROTO(spl_kmem_cache_generic_shrinker,
shrinker_cb, nr_to_scan, gfp_mask);
SPL_SHRINKER_DECLARE(spl_kmem_cache_shrinker,
spl_kmem_cache_generic_shrinker, KMC_DEFAULT_SEEKS);
static void *
kv_alloc(spl_kmem_cache_t *skc, int size, int flags)
@ -1859,14 +1848,8 @@ EXPORT_SYMBOL(spl_kmem_cache_free);
* objects should be freed, because Solaris semantics are to free
* all available objects we may free more objects than requested.
*/
#ifdef HAVE_3ARGS_SHRINKER_CALLBACK
static int
spl_kmem_cache_generic_shrinker(struct shrinker *shrinker_cb,
int nr_to_scan, unsigned int gfp_mask)
#else
static int
spl_kmem_cache_generic_shrinker(int nr_to_scan, unsigned int gfp_mask)
#endif /* HAVE_3ARGS_SHRINKER_CALLBACK */
SPL_SHRINKER_CALLBACK_PROTO(spl_kmem_cache_generic_shrinker,
shrinker_cb, nr_to_scan, gfp_mask)
{
spl_kmem_cache_t *skc;
int unused = 0;
@ -1930,11 +1913,7 @@ EXPORT_SYMBOL(spl_kmem_cache_reap_now);
void
spl_kmem_reap(void)
{
#ifdef HAVE_3ARGS_SHRINKER_CALLBACK
spl_kmem_cache_generic_shrinker(NULL, KMC_REAP_CHUNK, GFP_KERNEL);
#else
spl_kmem_cache_generic_shrinker(KMC_REAP_CHUNK, GFP_KERNEL);
#endif /* HAVE_3ARGS_SHRINKER_CALLBACK */
spl_exec_shrinker(&spl_kmem_cache_shrinker, KMC_REAP_CHUNK, GFP_KERNEL);
}
EXPORT_SYMBOL(spl_kmem_reap);
@ -2135,14 +2114,7 @@ spl_kmem_init(void)
init_rwsem(&spl_kmem_cache_sem);
INIT_LIST_HEAD(&spl_kmem_cache_list);
#ifdef HAVE_SET_SHRINKER
spl_kmem_cache_shrinker = set_shrinker(KMC_DEFAULT_SEEKS,
spl_kmem_cache_generic_shrinker);
if (spl_kmem_cache_shrinker == NULL)
SRETURN(rc = -ENOMEM);
#else
register_shrinker(&spl_kmem_cache_shrinker);
#endif
spl_register_shrinker(&spl_kmem_cache_shrinker);
#ifdef DEBUG_KMEM
kmem_alloc_used_set(0);
@ -2178,11 +2150,7 @@ spl_kmem_fini(void)
#endif /* DEBUG_KMEM */
SENTRY;
#ifdef HAVE_SET_SHRINKER
remove_shrinker(spl_kmem_cache_shrinker);
#else
unregister_shrinker(&spl_kmem_cache_shrinker);
#endif
spl_unregister_shrinker(&spl_kmem_cache_shrinker);
SEXIT;
}