bybrooklyn/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-04 22:43:04 -04:00
Code Issues Packages Projects Releases Wiki Activity

drm/msm: Avoid mutex in shrinker_count()

Browse Source 
When the system is under heavy memory pressure, we can end up with lots
of concurrent calls into the shrinker.  Keeping a running tab on what we
can shrink avoids grabbing a lock in shrinker->count(), and avoids
shrinker->scan() getting called when not profitable.

Also, we can keep purged objects in their own list to avoid re-traversing
them to help cut down time in the critical section further.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Tested-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20210401012722.527712-3-robdclark@gmail.com
Signed-off-by: Rob Clark <robdclark@chromium.org>
This commit is contained in:
Rob Clark
2021-03-31 18:27:19 -07:00
parent bc90dc33c4
commit cc8a4d5a1b
5 changed files with 81 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/gpu/drm/msm/msm_drv.h
View File

@@ -179,8 +179,8 @@ struct msm_drm_private {
* inactive lists (depending on whether or not it is shrinkable) or
* gpu->active_list (for the gpu it is active on[1])
*
* These lists are protected by mm_lock. If struct_mutex is involved, it
* should be aquired prior to mm_lock. One should *not* hold mm_lock in
* These lists are protected by mm_lock (which should be acquired
* before per GEM object lock). One should *not* hold mm_lock in
* get_pages()/vmap()/etc paths, as they can trigger the shrinker.
*
* [1] if someone ever added support for the old 2d cores, there could be
@@ -188,6 +188,8 @@ struct msm_drm_private {
*/
struct list_head inactive_willneed; /* inactive + !shrinkable */
struct list_head inactive_dontneed; /* inactive + shrinkable */
struct list_head inactive_purged; /* inactive + purged */
long shrinkable_count; /* write access under mm_lock */
struct mutex mm_lock;
struct workqueue_struct *wq;