Re: [mm-unstable v4 5/5] mm: memcg: restore subtree stats flushing

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On Mon, Dec 04, 2023 at 03:49:01PM -0800, Yosry Ahmed wrote:
[...]
> 
> From 19af26e01f93cbf0806d75a234b78e48c1ce9d80 Mon Sep 17 00:00:00 2001
> From: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
> Date: Mon, 4 Dec 2023 23:43:29 +0000
> Subject: [PATCH] mm: memcg: remove stats flushing mutex
> 
> The mutex was intended to make the waiters sleep instead of spin, and
> such that we can check the update thresholds again after acquiring the
> mutex. However, the mutex has a risk of priority inversion, especially
> since the underlying rstat lock can de dropped while the mutex is held.
> 
> Synthetic testing with high concurrency of flushers shows no
> regressions without the mutex, so remove it.
> 
> Suggested-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
> Signed-off-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx>

Acked-by: Shakeel Butt <shakeelb@xxxxxxxxxx>





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