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drm/msm: Avoid mutex in shrinker_count()

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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
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1
drivers/gpu/drm/msm/msm_drv.c
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@@ -448,6 +448,7 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
INIT_LIST_HEAD(&priv->inactive_willneed);
INIT_LIST_HEAD(&priv->inactive_dontneed);
INIT_LIST_HEAD(&priv->inactive_purged);
mutex_init(&priv->mm_lock);
/* Teach lockdep about lock ordering wrt. shrinker: */