linux-kernel - Re: [PATCH v2] drm/msm: Drop mm

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Date:   Fri, 2 Apr 2021 14:45:27 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Rob Clark <robdclark@...il.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        Jordan Crouse <jordan@...micpenguin.net>,
        Rob Clark <robdclark@...omium.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <freedreno@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] drm/msm: Drop mm_lock in scan loop

Hi,

On Fri, Apr 2, 2021 at 2:08 PM Rob Clark <robdclark@...il.com> wrote:
>
> From: Rob Clark <robdclark@...omium.org>
>
> lock_stat + mmm_donut[1] say that this reduces contention on mm_lock
> significantly (~350x lower waittime-max, and ~100x lower waittime-avg)
>
> [1] https://chromium.googlesource.com/chromiumos/platform/microbenchmarks/+/refs/heads/main/mmm_donut.py
>
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> ---
>  drivers/gpu/drm/msm/msm_drv.h          |  3 +-
>  drivers/gpu/drm/msm/msm_gem.c          |  2 +-
>  drivers/gpu/drm/msm/msm_gem_shrinker.c | 48 ++++++++++++++++++++++----
>  3 files changed, 45 insertions(+), 8 deletions(-)

Looks good to me now!

Reviewed-by: Douglas Anderson <dianders@...omium.org>