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From: Waiman Long <longman@redhat.com>
To: Dave Chinner <david@fromorbit.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()
Date: Wed, 12 Sep 2018 11:41:52 -0400	[thread overview]
Message-ID: <538489aa-d021-5662-7a46-d358f8770054@redhat.com> (raw)
In-Reply-To: <20180911220224.GE5631@dastard>

On 09/11/2018 06:02 PM, Dave Chinner wrote:
> 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>
>
I will add the cc:stable tag.

Cheers,
Longman

  reply	other threads:[~2018-09-12 15:41 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-11 19:18 [PATCH v3 0/4] fs/dcache: Track # of negative dentries Waiman Long
2018-09-11 19:18 ` [PATCH v3 1/4] fs/dcache: Fix incorrect nr_dentry_unused accounting in shrink_dcache_sb() Waiman Long
2018-09-11 22:02   ` Dave Chinner
2018-09-12 15:41     ` Waiman Long [this message]
2018-09-11 19:18 ` [PATCH v3 2/4] fs: Don't need to put list_lru into its own cacheline Waiman Long
2018-09-11 22:02   ` Dave Chinner
2018-09-11 19:18 ` [PATCH v3 3/4] fs/dcache: Track & report number of negative dentries Waiman Long
2018-09-11 22:08   ` Dave Chinner
2018-09-12 15:40     ` Waiman Long
2018-09-11 19:18 ` [PATCH v3 4/4] fs/dcache: Eliminate branches in nr_dentry_negative accounting Waiman Long
2018-09-11 22:13   ` Dave Chinner
2018-09-12 15:44     ` Waiman Long
2018-09-12  2:36   ` Matthew Wilcox
2018-09-12 15:49     ` Waiman Long
2018-09-12 15:55       ` Matthew Wilcox
2018-09-12 16:11         ` Waiman Long

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