From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Christoph Lameter <cl@linux.com>
Cc: gilad@benyossef.com, linux-mm@kvack.org,
ghaskins@londonstockexchange.com, niv@us.ibm.com,
kravetz@us.ibm.com
Subject: Re: vmstat kthreads
Date: Tue, 18 Jun 2013 11:26:16 -0700 [thread overview]
Message-ID: <20130618182616.GT5146@linux.vnet.ibm.com> (raw)
In-Reply-To: <0000013f58656ee7-8bb24ac4-72fa-4c0b-b888-7c056f261b6e-000000@email.amazonses.com>
On Tue, Jun 18, 2013 at 05:46:50PM +0000, Christoph Lameter wrote:
> On Tue, 18 Jun 2013, Paul E. McKenney wrote:
>
> > I have been digging around the vmstat kthreads a bit, and it appears to
> > me that there is no reason to run a given CPU's vmstat kthread unless
> > that CPU spends some time executing in the kernel. If correct, this
> > observation indicates that one way to safely reduce OS jitter due to the
> > vmstat kthreads is to prevent them from executing on a given CPU if that
> > CPU has been executing in usermode since the last time that this CPU's
> > vmstat kthread executed.
>
> Right and we have patches to that effect.
Even better!
> > Does this seem like a sensible course of action, or did I miss something
> > when I went through the code?
>
> Nope you are right on.
>
> Gilad Ben-Yossef has been posting patches that address this issue in Feb
> 2012. Ccing him. Can we see your latest work, Gilead?
Is it this one?
https://lkml.org/lkml/2012/5/3/269
Thanx, Paul
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next prev parent reply other threads:[~2013-06-18 18:27 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-18 15:23 vmstat kthreads Paul E. McKenney
2013-06-18 17:46 ` Christoph Lameter
2013-06-18 18:26 ` Paul E. McKenney [this message]
2013-06-19 14:23 ` Christoph Lameter
2013-06-19 14:50 ` Gilad Ben-Yossef
2013-06-19 14:57 ` Gilad Ben-Yossef
2013-06-20 5:06 ` Gilad Ben-Yossef
2013-06-19 14:59 ` Paul E. McKenney
2013-06-19 20:18 ` Christoph Lameter
2013-06-19 20:02 ` [PATCH v2 1/2] mm: make vmstat_update periodic run conditional Gilad Ben-Yossef
2013-06-20 14:05 ` Christoph Lameter
2013-08-07 18:16 ` Christoph Lameter
2013-08-08 6:28 ` Gilad Ben-Yossef
2013-08-08 6:54 ` Gilad Ben-Yossef
2013-08-08 14:59 ` Christoph Lameter
2013-08-09 18:56 ` Gilad Ben-Yossef
2013-08-28 19:28 ` Christoph Lameter
2013-06-19 20:02 ` [PATCH v2 2/2] mm: add sysctl to pick vmstat monitor cpu Gilad Ben-Yossef
2013-06-20 13:58 ` Christoph Lameter
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