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mm/zsmalloc: simplify shrinker init/destroy 

Structure zs_pool has special flag to indicate success of shrinker
initialization.  unregister_shrinker() has improved and can detect by
itself whether actual deinitialization should be performed or not, so
extra flag becomes redundant.

[akpm@linux-foundation.org: update comment (Aliaksei), remove unneeded cast]
Link: http://lkml.kernel.org/r/1513680552-9798-1-git-send-email-akaraliou.dev@gmail.com
Signed-off-by: Aliaksei Karaliou <akaraliou.dev@gmail.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Aliaksei Karaliou 2018-01-31 16:18:40 -08:00 committed by Linus Torvalds
parent f340ff8203
commit 93144ca350
1 changed files with 9 additions and 13 deletions
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20
mm/zsmalloc.c
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@ -46,6 +46,7 @@
#include <linux/vmalloc.h>
#include <linux/preempt.h>
#include <linux/spinlock.h>
#include <linux/shrinker.h>
#include <linux/types.h>
#include <linux/debugfs.h>
#include <linux/zsmalloc.h>
@ -257,11 +258,7 @@ struct zs_pool {
/* Compact classes */
struct shrinker shrinker;
/*
* To signify that register_shrinker() was successful
* and unregister_shrinker() will not Oops.
*/
bool shrinker_enabled;
#ifdef CONFIG_ZSMALLOC_STAT
struct dentry *stat_dentry;
#endif
@ -2324,10 +2321,7 @@ static unsigned long zs_shrinker_count(struct shrinker *shrinker,
static void zs_unregister_shrinker(struct zs_pool *pool)
{
if (pool->shrinker_enabled) {
unregister_shrinker(&pool->shrinker);
pool->shrinker_enabled = false;
}
}
static int zs_register_shrinker(struct zs_pool *pool)
@ -2426,11 +2420,13 @@ struct zs_pool *zs_create_pool(const char *name)
goto err;
/*
* Not critical, we still can use the pool
* and user can trigger compaction manually.
* Not critical since shrinker is only used to trigger internal
* defragmentation of the pool which is pretty optional thing. If
* registration fails we still can use the pool normally and user can
* trigger compaction manually. Thus, ignore return code.
*/
if (zs_register_shrinker(pool) == 0)
pool->shrinker_enabled = true;
zs_register_shrinker(pool);
return pool;
err: