linux-kernel - Re: [PATCH] mm/workingset: do not forget to unlock page

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Date:	Wed, 3 Feb 2016 11:24:00 -0500
From:	Johannes Weiner <hannes@...xchg.org>
To:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Vladimir Davydov <vdavydov@...tuozzo.com>,
	Michal Hocko <mhocko@...e.cz>, cgroups@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [PATCH] mm/workingset: do not forget to unlock page

On Wed, Feb 03, 2016 at 07:41:36PM +0900, Sergey Senozhatsky wrote:
> From 1d6315221f2f81c53c99f9980158f8ae49dbd582 Mon Sep 17 00:00:00 2001
> From: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> Date: Wed, 3 Feb 2016 18:49:16 +0900
> Subject: [PATCH] mm/workingset: do not forget to unlock_page in workingset_activation
> 
> Do not return from workingset_activation() with locked rcu and page.
> 
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>

Thanks Sergey. Even though I wrote this function, my brain must have
gone "it can't be locking anything when it returns NULL, right?" It's
a dumb interface. Luckily, that's fixed with follow-up patches in -mm.

As for this one:

Acked-by: Johannes Weiner <hannes@...xchg.org>
Fixes: mm: workingset: per-cgroup cache thrash detection

Andrew, can you please fold this?