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Date: Wed, 12 Sep 2018 08:02:24 +1000
From: Dave Chinner <david@fromorbit.com>
To: Waiman Long <longman@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
	Jonathan Corbet <corbet@lwn.net>, linux-kernel@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
	linux-doc@vger.kernel.org, "Luis R. Rodriguez" <mcgrof@kernel.org>,
	Kees Cook <keescook@chromium.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Jan Kara <jack@suse.cz>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Ingo Molnar <mingo@kernel.org>,
	Miklos Szeredi <mszeredi@redhat.com>,
	Matthew Wilcox <willy@infradead.org>,
	Larry Woodman <lwoodman@redhat.com>,
	James Bottomley <James.Bottomley@HansenPartnership.com>,
	"Wangkai (Kevin C)" <wangkai86@huawei.com>,
	Michal Hocko <mhocko@kernel.org>
Subject: Re: [PATCH v3 1/4] fs/dcache: Fix incorrect nr_dentry_unused
 accounting in shrink_dcache_sb()
Message-ID: <20180911220224.GE5631@dastard>
References: <1536693506-11949-1-git-send-email-longman@redhat.com>
 <1536693506-11949-2-git-send-email-longman@redhat.com>
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On Tue, Sep 11, 2018 at 03:18:23PM -0400, Waiman Long wrote:
> The nr_dentry_unused per-cpu counter tracks dentries in both the
> LRU lists and the shrink lists where the DCACHE_LRU_LIST bit is set.
> The shrink_dcache_sb() function moves dentries from the LRU list to a
> shrink list and subtracts the dentry count from nr_dentry_unused. This
> is incorrect as the nr_dentry_unused count Will also be decremented in
> shrink_dentry_list() via d_shrink_del(). To fix this double decrement,
> the decrement in the shrink_dcache_sb() function is taken out.
> 
> Fixes: 4e717f5c1083 ("list_lru: remove special case function list_lru_dispose_all."
> 
> Signed-off-by: Waiman Long <longman@redhat.com>

Please add a stable tag for this.

Otherwise looks fine.

Reviewed-by: Dave Chinner <dchinner@redhat.com>

-- 
Dave Chinner
david@fromorbit.com