From: Andrew Morton <akpm@linux-foundation.org>
To: Waiman Long <longman@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Jan Kara <jack@suse.cz>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
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>
Subject: Re: [PATCH v5 2/6] fs/dcache: Make negative dentry tracking configurable
Date: Mon, 2 Jul 2018 14:12:06 -0700 [thread overview]
Message-ID: <20180702141206.8d08b4769a9c8a4300ce06de@linux-foundation.org> (raw)
In-Reply-To: <1530510723-24814-3-git-send-email-longman@redhat.com>
On Mon, 2 Jul 2018 13:51:59 +0800 Waiman Long <longman@redhat.com> wrote:
> The negative dentry tracking is made a configurable option so that
> users who don't care about negative dentry tracking will have the
> option to disable it. The new config option DCACHE_TRACK_NEG_ENTRY
> is disabled by default.
>
> If this option is enabled, a new kernel parameter "neg_dentry_pc=<%>"
> allows users to set the soft limit on how many negative dentries are
> allowed as a percentage of the total system memory. The default is 2%
> and this new parameter accept a range of 0-10% where 0% means there
> is no limit.
>
> When the soft limit is reached, a warning message will be printed to
> the console to alert the system administrator.
It would be much more convenient if this was tunable at runtime via yet
another /proc knob. Is there any particular reason why we can't do this?
next prev parent reply other threads:[~2018-07-02 21:12 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-02 5:51 [PATCH v5 0/6] fs/dcache: Track & limit # of negative dentries Waiman Long
2018-07-02 5:51 ` [PATCH v5 1/6] fs/dcache: Track & report number " Waiman Long
2018-07-02 5:51 ` [PATCH v5 2/6] fs/dcache: Make negative dentry tracking configurable Waiman Long
2018-07-02 21:12 ` Andrew Morton [this message]
2018-07-03 0:59 ` Waiman Long
2018-07-02 5:52 ` [PATCH v5 3/6] fs/dcache: Enable automatic pruning of negative dentries Waiman Long
2018-07-02 5:52 ` [PATCH v5 4/6] fs/dcache: Spread negative dentry pruning across multiple CPUs Waiman Long
2018-07-02 5:52 ` [PATCH v5 5/6] fs/dcache: Allow optional enforcement of negative dentry limit Waiman Long
2018-07-02 5:52 ` [PATCH v5 6/6] fs/dcache: Make negative dentry limit enforcement sysctl parameter Waiman Long
2018-07-02 19:34 ` [PATCH v5 0/6] fs/dcache: Track & limit # of negative dentries Linus Torvalds
2018-07-02 21:18 ` Andrew Morton
2018-07-02 22:21 ` Matthew Wilcox
2018-07-02 22:31 ` Linus Torvalds
2018-07-02 22:34 ` James Bottomley
2018-07-02 22:54 ` Linus Torvalds
2018-07-02 23:03 ` Linus Torvalds
2018-07-02 23:19 ` Andrew Morton
2018-07-02 23:28 ` Linus Torvalds
2018-07-03 1:38 ` Waiman Long
2018-07-03 9:18 ` Jan Kara
2018-07-14 17:35 ` Pavel Machek
2018-07-14 18:00 ` Linus Torvalds
2018-07-14 18:34 ` Al Viro
2018-07-14 18:36 ` Al Viro
2018-07-14 18:43 ` Linus Torvalds
2018-07-18 16:01 ` Waiman Long
2018-07-03 1:11 ` Waiman Long
2018-07-03 13:48 ` Vlastimil Babka
2018-07-03 0:46 ` Waiman Long
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