From: Peter Zijlstra <peterz@infradead.org>
To: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>,
"H. Peter Anvin" <hpa@zytor.com>,
"David S.Miller" <davem@davemloft.net>,
Ingo Molnar <mingo@kernel.org>,
Chandramouli Narayanan <mouli@linux.intel.com>,
Vinodh Gopal <vinodh.gopal@intel.com>,
James Guilford <james.guilford@intel.com>,
Wajdi Feghali <wajdi.k.feghali@intel.com>,
Jussi Kivilinna <jussi.kivilinna@iki.fi>,
linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 6/7] sched: add function nr_running_cpu to expose number of tasks running on cpu
Date: Tue, 15 Jul 2014 14:07:28 +0200 [thread overview]
Message-ID: <20140715120728.GR3588@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20140715095045.GV9918@twins.programming.kicks-ass.net>
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On Tue, Jul 15, 2014 at 11:50:45AM +0200, Peter Zijlstra wrote:
> So you already have an idle notifier (which is x86 only, we should fix
> that I suppose), and you then double check there really isn't anything
> else running.
Note that we've already done a large part of the expense of going idle
by the time we call that idle notifier -- in specific, we've
reprogrammed the clock to stop the tick.
Its really wasteful to then generate work again, which means we have to
again reprogram the clock etc.
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next prev parent reply other threads:[~2014-07-15 12:07 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1405074379.git.tim.c.chen@linux.intel.com>
2014-07-11 20:32 ` [PATCH v4 0/7] crypto: SHA1 multibuffer implementation Tim Chen
2014-07-11 20:32 ` [PATCH v4 1/7] crypto: SHA1 multibuffer crypto hash infrastructure Tim Chen
2014-07-11 20:32 ` [PATCH v4 2/7] crypto: SHA1 multibuffer algorithm data structures Tim Chen
2014-07-11 20:32 ` [PATCH v4 3/7] crypto: SHA1 multibuffer submit and flush routines for AVX2 Tim Chen
2014-07-11 20:32 ` [PATCH v4 4/7] crypto: SHA1 multibuffer crypto computation (x8 AVX2) Tim Chen
2014-07-11 20:33 ` [PATCH v4 5/7] crypto: SHA1 multibuffer scheduler Tim Chen
2014-07-11 20:33 ` [PATCH v4 6/7] sched: add function nr_running_cpu to expose number of tasks running on cpu Tim Chen
2014-07-12 9:25 ` Kirill Tkhai
2014-07-14 17:51 ` Tim Chen
2014-07-12 14:21 ` Tadeusz Struk
2014-07-14 23:51 ` Tim Chen
2014-07-14 10:16 ` Peter Zijlstra
2014-07-14 16:10 ` Tim Chen
2014-07-14 16:14 ` Peter Zijlstra
2014-07-14 17:05 ` Tim Chen
2014-07-14 18:17 ` Peter Zijlstra
2014-07-14 19:08 ` Tim Chen
2014-07-14 19:15 ` Peter Zijlstra
2014-07-14 19:50 ` Tim Chen
2014-07-15 9:50 ` Peter Zijlstra
2014-07-15 12:07 ` Peter Zijlstra [this message]
2014-07-15 12:59 ` Thomas Gleixner
2014-07-15 14:45 ` Mike Galbraith
2014-07-15 14:53 ` Peter Zijlstra
2014-07-15 18:06 ` Mike Galbraith
2014-07-15 19:03 ` Peter Zijlstra
2014-07-15 19:24 ` Mike Galbraith
2014-07-15 18:41 ` Tim Chen
2014-07-15 20:46 ` Thomas Gleixner
2014-07-15 18:40 ` Tim Chen
2014-07-15 18:40 ` Tim Chen
2014-07-15 13:36 ` Peter Zijlstra
2014-07-15 15:21 ` Tejun Heo
2014-07-15 16:37 ` Peter Zijlstra
2014-07-11 20:33 ` [PATCH v4 7/7] crypto: SHA1 multibuffer - flush the jobs early if cpu becomes idle Tim Chen
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