From: Shiraz Hashim <shiraz.linux.kernel@gmail.com>
To: Christoph Lameter <cl@linux.com>
Cc: Michal Hocko <mhocko@kernel.org>,
akpm@linux-foundation.org, linux-mm@kvack.org,
LKML <linux-kernel@vger.kernel.org>,
hannes@cmpxchg.org, penguin-kernel@i-love.sakura.ne.jp
Subject: Re: vmstat: make vmstat_updater deferrable again and shut down on idle
Date: Wed, 20 Jan 2016 19:22:09 +0530 [thread overview]
Message-ID: <CAPub148GRFho0oS9Vf0UdX+2Q84+031DE7jKj6Nxc0o0ZqWEmA@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.20.1512101441140.19122@east.gentwo.org>
Hi Christoph,
On Fri, Dec 11, 2015 at 2:15 AM, Christoph Lameter <cl@linux.com> wrote:
> Currently the vmstat updater is not deferrable as a result of commit
> ba4877b9ca51f80b5d30f304a46762f0509e1635. This in turn can cause multiple
> interruptions of the applications because the vmstat updater may run at
> different times than tick processing. No good.
>
> Make vmstate_update deferrable again and provide a function that
> folds the differentials when the processor is going to idle mode thus
> addressing the issue of the above commit in a clean way.
>
The patch makes vmstat_shepherd deferable which if is quiesed
would not schedule vmstat update on other cpus. Wouldn't this
aggravate the problem of vmstat for rest cpus not gettng updated.
regards
Shiraz
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next prev parent reply other threads:[~2016-01-20 13:52 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-10 20:45 Christoph Lameter
2015-12-10 23:31 ` Andrew Morton
2015-12-11 1:41 ` Christoph Lameter
2015-12-14 18:32 ` Christoph Lameter
2016-01-20 13:52 ` Shiraz Hashim [this message]
2016-01-20 15:12 ` Christoph Lameter
2016-01-21 6:24 ` Shiraz Hashim
2016-01-21 15:41 ` Christoph Lameter
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