From: Michal Hocko <mhocko@suse.cz>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Viresh Kumar <viresh.kumar@linaro.org>,
Andrew Morton <akpm@linux-foundation.org>,
hannes@cmpxchg.org, Christoph Lameter <cl@linux.com>,
Linaro Kernel Mailman List <linaro-kernel@lists.linaro.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
vinmenon@codeaurora.org, shashim@codeaurora.org, mgorman@suse.de,
dave@stgolabs.net, koct9i@gmail.com,
Linux Memory Management List <linux-mm@kvack.org>,
Suresh Siddha <suresh.b.siddha@intel.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [RFC] vmstat: Avoid waking up idle-cpu to service shepherd work
Date: Mon, 30 Mar 2015 17:08:18 +0200 [thread overview]
Message-ID: <20150330150818.GE3909@dhcp22.suse.cz> (raw)
In-Reply-To: <20150328095322.GH27490@worktop.programming.kicks-ass.net>
On Sat 28-03-15 10:53:22, Peter Zijlstra wrote:
[...]
> Alternatively the thing hocko suggests is an utter fail too. You cannot
> stuff that into hardirq context, that's insane.
I guess you are referring to
http://article.gmane.org/gmane.linux.kernel.mm/127569, right?
Why cannot we do something like refresh_cpu_vm_stats from the IRQ
context? Especially the first zone stat part. The per-cpu pagesets is
more costly and it would need a special treatment, alright. A simple
way would be to splice the lists from the per-cpu context and then free
those pages from the kthread context.
I am still wondering why those two things were squashed into a single
place. Why kswapd is not doing the pcp cleanup?
--
Michal Hocko
SUSE Labs
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next prev parent reply other threads:[~2015-03-30 15:08 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-26 5:39 Viresh Kumar
2015-03-26 20:18 ` Andrew Morton
2015-03-27 4:49 ` Viresh Kumar
2015-03-27 9:16 ` Peter Zijlstra
2015-03-27 9:30 ` Peter Zijlstra
2015-03-27 11:11 ` Christoph Lameter
2015-03-27 12:02 ` Peter Zijlstra
2015-03-27 19:45 ` Christoph Lameter
2015-03-28 4:28 ` Viresh Kumar
2015-03-28 11:41 ` Peter Zijlstra
2015-03-28 4:18 ` Viresh Kumar
2015-03-28 9:53 ` Peter Zijlstra
2015-03-28 11:57 ` viresh kumar
2015-03-28 12:04 ` Viresh Kumar
2015-03-28 13:44 ` Peter Zijlstra
2015-03-29 10:24 ` Peter Zijlstra
2015-03-30 12:02 ` Viresh Kumar
2015-03-30 12:47 ` Peter Zijlstra
2015-03-30 13:14 ` Viresh Kumar
2015-03-30 13:59 ` Peter Zijlstra
2015-03-30 16:17 ` Viresh Kumar
2015-03-30 16:25 ` Peter Zijlstra
2015-03-29 12:01 ` Viresh Kumar
2015-03-29 17:24 ` Peter Zijlstra
2015-03-30 15:08 ` Michal Hocko [this message]
2015-03-30 15:14 ` Peter Zijlstra
2015-03-30 15:42 ` Christoph Lameter
2015-03-27 14:19 ` Michal Hocko
2015-03-28 4:34 ` Viresh Kumar
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