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

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Date:	Thu, 4 Feb 2016 09:19:00 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>
Cc:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	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 (02/03/16 17:02), Johannes Weiner wrote:
> On Wed, Feb 03, 2016 at 01:19:39PM -0800, Andrew Morton wrote:
> > Yup.  I turned it into a fix against
> > mm-workingset-per-cgroup-cache-thrash-detection.patch, which is where
> > the bug was added.  And I did the goto thing instead, so the final
> > result will be
> > 
> > void workingset_activation(struct page *page)
> > {
> > 	struct lruvec *lruvec;
> > 
> > 	lock_page_memcg(page);
> > 	/*
> > 	 * Filter non-memcg pages here, e.g. unmap can call
> > 	 * mark_page_accessed() on VDSO pages.
> > 	 *
> > 	 * XXX: See workingset_refault() - this should return
> > 	 * root_mem_cgroup even for !CONFIG_MEMCG.
> > 	 */
> > 	if (!mem_cgroup_disabled() && !page_memcg(page))
> > 		goto out;
> > 	lruvec = mem_cgroup_zone_lruvec(page_zone(page), page_memcg(page));
> > 	atomic_long_inc(&lruvec->inactive_age);
> > out:
> > 	unlock_page_memcg(page);
> > }
> 
> LGTM, thank you.

Thanks!

	-ss