linux-kernel - Re: Reading /proc/slabinfo causes stalls

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Message-ID: <CAOJsxLF2VJRRu_i2aCARwiw6knyrwL1HpZ1zGOASP133fNxv8Q@mail.gmail.com>
Date:	Tue, 16 Oct 2012 21:04:28 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Avleen Vig <avleen@...il.com>
Cc:	linux-kernel@...r.kernel.org, Christoph Lameter <cl@...ux.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Reading /proc/slabinfo causes stalls

Hi Avleen,

On Tue, Oct 16, 2012 at 8:51 PM, Avleen Vig <avleen@...il.com> wrote:
> I *think* this is the right place to ask this, and apologies if it's not
> (is there a better place?).
>
> We have checks which read /proc/slabinfo once a minute, and have noticed
> that this causes the entire system to stall for a few milliseconds.
> It's long enough that it causes noticeable delays in latency-sensitive
> applications (between 10ms and 100ms).
>
> Is this a known condition? Are there work arounds or other ways to get the
> slab allocation data which don't cause stalls?

What kernel version are you using? What does your .config look like?
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