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| author | Christian König <ckoenig.leichtzumerken@gmail.com> | 2021-04-15 14:56:23 +0300 |
|---|---|---|
| committer | Christian König <christian.koenig@amd.com> | 2021-08-27 10:55:15 +0300 |
| commit | 880121be1179a0db3eb4fdb198108d9475b8be4c (patch) | |
| tree | 60547e431f158d6a5cf33d96f60dab470253486e /include/linux/shrinker.h | |
| parent | 28210a3f5412c7dfe93cf1579c512fd30aef727e (diff) | |
| download | linux-880121be1179a0db3eb4fdb198108d9475b8be4c.tar.xz | |
mm/vmscan: add sync_shrinkers function v3
While unplugging a device the TTM shrinker implementation
needs a barrier to make sure that all concurrent shrink
operations are done and no other CPU is referring to a
device specific pool any more.
Taking and releasing the shrinker semaphore on the write
side after unmapping and freeing all pages from the device
pool should make sure that no shrinker is running in
paralell.
This allows us to avoid the contented mutex in the TTM pool
implementation for every alloc/free operation.
v2: rework the commit message to make clear why we need this
v3: rename the function and add more doc as suggested by Daniel
Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210820120528.81114-2-christian.koenig@amd.com
Diffstat (limited to 'include/linux/shrinker.h')
| -rw-r--r-- | include/linux/shrinker.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h index 9814fff58a69..76fbf92b04d9 100644 --- a/include/linux/shrinker.h +++ b/include/linux/shrinker.h @@ -93,4 +93,5 @@ extern void register_shrinker_prepared(struct shrinker *shrinker); extern int register_shrinker(struct shrinker *shrinker); extern void unregister_shrinker(struct shrinker *shrinker); extern void free_prealloced_shrinker(struct shrinker *shrinker); +extern void synchronize_shrinkers(void); #endif |