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From: Viresh Kumar <viresh.kumar@linaro.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Christoph Lameter <cl@linux.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Linaro Kernel Mailman List <linaro-kernel@lists.linaro.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	vinmenon@codeaurora.org, shashim@codeaurora.org,
	Michal Hocko <mhocko@suse.cz>, Mel Gorman <mgorman@suse.de>,
	dave@stgolabs.net, Konstantin Khlebnikov <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: Sat, 28 Mar 2015 09:58:38 +0530	[thread overview]
Message-ID: <CAKohpomiqOcmZe+tAPNv_kX=+FmtMu8K=Qgze1y2SvgJ1A16NQ@mail.gmail.com> (raw)
In-Reply-To: <20150327120240.GC23123@twins.programming.kicks-ass.net>

On 27 March 2015 at 17:32, Peter Zijlstra <peterz@infradead.org> wrote:
> What's not clear to me is why that thing is allocated at all, AFAICT
> something like:
>
> static DEFINE_PER_CPU(struct tvec_base, tvec_bases);
>
> Should do the right thing and be much simpler.

Does this comment from timers.c answers your query ?

                        /*
                         * This is for the boot CPU - we use compile-time
                         * static initialisation because per-cpu memory isn't
                         * ready yet and because the memory allocators are not
                         * initialised either.
                         */

WARNING: multiple messages have this Message-ID (diff)
From: Viresh Kumar <viresh.kumar@linaro.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Christoph Lameter <cl@linux.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Linaro Kernel Mailman List <linaro-kernel@lists.linaro.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	vinmenon@codeaurora.org, shashim@codeaurora.org,
	Michal Hocko <mhocko@suse.cz>, Mel Gorman <mgorman@suse.de>,
	dave@stgolabs.net, Konstantin Khlebnikov <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: Sat, 28 Mar 2015 09:58:38 +0530	[thread overview]
Message-ID: <CAKohpomiqOcmZe+tAPNv_kX=+FmtMu8K=Qgze1y2SvgJ1A16NQ@mail.gmail.com> (raw)
In-Reply-To: <20150327120240.GC23123@twins.programming.kicks-ass.net>

On 27 March 2015 at 17:32, Peter Zijlstra <peterz@infradead.org> wrote:
> What's not clear to me is why that thing is allocated at all, AFAICT
> something like:
>
> static DEFINE_PER_CPU(struct tvec_base, tvec_bases);
>
> Should do the right thing and be much simpler.

Does this comment from timers.c answers your query ?

                        /*
                         * This is for the boot CPU - we use compile-time
                         * static initialisation because per-cpu memory isn't
                         * ready yet and because the memory allocators are not
                         * initialised either.
                         */

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  parent reply	other threads:[~2015-03-28  4:28 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-26  5:39 [RFC] vmstat: Avoid waking up idle-cpu to service shepherd work Viresh Kumar
2015-03-26  5:39 ` Viresh Kumar
2015-03-26 20:18 ` Andrew Morton
2015-03-26 20:18   ` Andrew Morton
2015-03-27  4:49   ` Viresh Kumar
2015-03-27  4:49     ` Viresh Kumar
2015-03-27  9:16     ` Peter Zijlstra
2015-03-27  9:16       ` Peter Zijlstra
2015-03-27  9:30       ` Peter Zijlstra
2015-03-27  9:30         ` Peter Zijlstra
2015-03-27 11:11         ` Christoph Lameter
2015-03-27 11:11           ` Christoph Lameter
2015-03-27 12:02           ` Peter Zijlstra
2015-03-27 12:02             ` Peter Zijlstra
2015-03-27 19:45             ` Christoph Lameter
2015-03-27 19:45               ` Christoph Lameter
2015-03-28  4:28             ` Viresh Kumar [this message]
2015-03-28  4:28               ` Viresh Kumar
2015-03-28 11:41               ` Peter Zijlstra
2015-03-28 11:41                 ` Peter Zijlstra
2015-03-28  4:18         ` Viresh Kumar
2015-03-28  4:18           ` Viresh Kumar
2015-03-28  9:53           ` Peter Zijlstra
2015-03-28  9:53             ` Peter Zijlstra
2015-03-28 11:57             ` viresh kumar
2015-03-28 11:57               ` viresh kumar
2015-03-28 12:04               ` Viresh Kumar
2015-03-28 12:04                 ` Viresh Kumar
2015-03-28 13:44               ` Peter Zijlstra
2015-03-28 13:44                 ` Peter Zijlstra
2015-03-29 10:24                 ` Peter Zijlstra
2015-03-29 10:24                   ` Peter Zijlstra
2015-03-30 12:02                   ` Viresh Kumar
2015-03-30 12:02                     ` Viresh Kumar
2015-03-30 12:47                     ` Peter Zijlstra
2015-03-30 12:47                       ` Peter Zijlstra
2015-03-30 13:14                       ` Viresh Kumar
2015-03-30 13:14                         ` Viresh Kumar
2015-03-30 13:59                         ` Peter Zijlstra
2015-03-30 13:59                           ` Peter Zijlstra
2015-03-30 16:17                           ` Viresh Kumar
2015-03-30 16:17                             ` Viresh Kumar
2015-03-30 16:25                             ` Peter Zijlstra
2015-03-30 16:25                               ` Peter Zijlstra
2015-03-29 12:01                 ` Viresh Kumar
2015-03-29 12:01                   ` Viresh Kumar
2015-03-29 17:24                   ` Peter Zijlstra
2015-03-29 17:24                     ` Peter Zijlstra
2015-03-30 15:08             ` Michal Hocko
2015-03-30 15:08               ` Michal Hocko
2015-03-30 15:14               ` Peter Zijlstra
2015-03-30 15:14                 ` Peter Zijlstra
2015-03-30 15:42               ` Christoph Lameter
2015-03-30 15:42                 ` Christoph Lameter
2015-03-27 14:19 ` Michal Hocko
2015-03-27 14:19   ` Michal Hocko
2015-03-28  4:34   ` Viresh Kumar
2015-03-28  4:34     ` Viresh Kumar

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