linux-kernel - [PATCH v2 0/4] drm/msm: Shrinker (and related) fixes

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Date:   Wed, 31 Mar 2021 18:27:17 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Rob Clark <robdclark@...omium.org>,
        freedreno@...ts.freedesktop.org (open list:DRM DRIVER FOR MSM ADRENO
        GPU), Jordan Crouse <jordan@...micpenguin.net>,
        "Kristian H. Kristensen" <hoegsberg@...gle.com>,
        linaro-mm-sig@...ts.linaro.org (moderated list:DMA BUFFER SHARING
        FRAMEWORK),
        linux-arm-msm@...r.kernel.org (open list:DRM DRIVER FOR MSM ADRENO GPU),
        linux-kernel@...r.kernel.org (open list),
        linux-media@...r.kernel.org (open list:DMA BUFFER SHARING FRAMEWORK)
Subject: [PATCH v2 0/4] drm/msm: Shrinker (and related) fixes

From: Rob Clark <robdclark@...omium.org>

I've been spending some time looking into how things behave under high
memory pressure.  The first patch is a random cleanup I noticed along
the way.  The second improves the situation significantly when we are
getting shrinker called from many threads in parallel.  And the last
two are $debugfs/gem fixes I needed so I could monitor the state of GEM
objects (ie. how many are active/purgable/purged) while triggering high
memory pressure.

We could probably go a bit further with dropping the mm_lock in the
shrinker->scan() loop, but this is already a pretty big improvement.
The next step is probably actually to add support to unpin/evict
inactive objects.  (We are part way there since we have already de-
coupled the iova lifetime from the pages lifetime, but there are a
few sharp corners to work through.)

Rob Clark (4):
  drm/msm: Remove unused freed llist node
  drm/msm: Avoid mutex in shrinker_count()
  drm/msm: Fix debugfs deadlock
  drm/msm: Improved debugfs gem stats

 drivers/gpu/drm/msm/msm_debugfs.c      | 14 ++---
 drivers/gpu/drm/msm/msm_drv.c          |  4 ++
 drivers/gpu/drm/msm/msm_drv.h          | 15 ++++--
 drivers/gpu/drm/msm/msm_fb.c           |  3 +-
 drivers/gpu/drm/msm/msm_gem.c          | 65 ++++++++++++++++++-----
 drivers/gpu/drm/msm/msm_gem.h          | 72 +++++++++++++++++++++++---
 drivers/gpu/drm/msm/msm_gem_shrinker.c | 28 ++++------
 7 files changed, 150 insertions(+), 51 deletions(-)

-- 
2.30.2