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From: Tejun Heo <tj@kernel.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
	Peter Zijlstra <peterz@infradead.org>,
	efault@gmx.de, avi@redhat.com, paulus@samba.org, acme@redhat.com,
	linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCHSET] sched,perf: unify tracers in sched and move perf on top of TP
Date: Thu, 06 May 2010 09:11:18 +0200	[thread overview]
Message-ID: <4BE26B96.4040007@kernel.org> (raw)
In-Reply-To: <20100506062855.GD1172@elte.hu>

Hello,

On 05/06/2010 08:28 AM, Ingo Molnar wrote:
> ( They are also under intense optimization - the jump-tracepoints patch makes 
>   them probably even cheaper than preempt notifiers, in the off case. )

I mostly agree on other points but TPs and sched_notifiers are
inherently different in how they are enabled/disabled.
sched_notifiers are enabled/disabled per-task and at least w/ cmwq,
there will always be some tasks with active sched_notifiers so code
level optimizations aren't really useful.

Thanks.

-- 
tejun

  reply	other threads:[~2010-05-06  7:11 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-05-04 12:38 Tejun Heo
2010-05-04 12:38 ` [PATCH 01/12] sched: drop @cpu argument from sched_in preempt notifier Tejun Heo
2010-05-04 17:11   ` Peter Zijlstra
2010-05-04 12:38 ` [PATCH 02/12] sched: rename preempt_notifiers to sched_notifiers and refactor implementation Tejun Heo
2010-05-04 12:38 ` [PATCH 03/12] perf: add perf_event_task_migrate() Tejun Heo
2010-05-05  5:08   ` Frederic Weisbecker
2010-05-05  5:16     ` Tejun Heo
2010-05-05  9:11     ` Peter Zijlstra
2010-05-05  9:37       ` Tejun Heo
2010-05-05  9:50         ` Peter Zijlstra
2010-05-05  9:56           ` Tejun Heo
2010-05-04 12:38 ` [PATCH 04/12] perf: add @rq to perf_event_task_sched_out() Tejun Heo
2010-05-04 17:11   ` Peter Zijlstra
2010-05-04 17:22     ` Tejun Heo
2010-05-04 17:42       ` Peter Zijlstra
2010-05-04 18:22       ` Steven Rostedt
2010-05-04 18:26         ` Peter Zijlstra
2010-05-04 18:32           ` Steven Rostedt
2010-05-05  4:48             ` Tejun Heo
2010-05-05  9:58             ` Tejun Heo
2010-05-07 18:41           ` [tip:sched/core] sched: Remove rq argument to the tracepoints tip-bot for Peter Zijlstra
2010-05-04 12:38 ` [PATCH 05/12] perf: move perf_event_task_sched_in() next to fire_sched_notifiers_in() Tejun Heo
2010-05-04 12:38 ` [PATCH 06/12] sched: relocate fire_sched_notifiers_out() and trace_sched_switch() Tejun Heo
2010-05-04 12:38 ` [PATCH 07/12] sched: coalesce event notifiers Tejun Heo
2010-05-04 12:38 ` [PATCH 08/12] sched: add switch_in and tick tracepoints Tejun Heo
2010-05-04 12:38 ` [PATCH 09/12] perf: factor out perf_event_switch_clones() Tejun Heo
2010-05-04 12:38 ` [PATCH 10/12] perf: make nr_events an int and add perf_online_mutex to protect it Tejun Heo
2010-05-04 12:38 ` [PATCH 11/12] perf: prepare to move sched perf functions on top of tracepoints Tejun Heo
2010-05-04 12:38 ` [PATCH 12/12] perf: " Tejun Heo
2010-05-04 17:29 ` [RFC PATCHSET] sched,perf: unify tracers in sched and move perf on top of TP Peter Zijlstra
2010-05-05  5:00   ` Tejun Heo
2010-05-05  9:06     ` Peter Zijlstra
2010-05-05  9:32       ` Tejun Heo
2010-05-05  9:51         ` Peter Zijlstra
2010-05-05  9:54           ` Tejun Heo
2010-05-05 11:38             ` Peter Zijlstra
2010-05-05 12:28               ` Tejun Heo
2010-05-05 16:55                 ` Ingo Molnar
2010-05-05 18:12                   ` Peter Zijlstra
2010-05-05 18:16                     ` Peter Zijlstra
2010-05-05 18:30                       ` Frederic Weisbecker
2010-05-06  6:28                         ` Ingo Molnar
2010-05-06  7:11                           ` Tejun Heo [this message]
2010-05-06  8:27                             ` Ingo Molnar
2010-05-06  8:41                               ` Tejun Heo
2010-05-06  8:18                           ` Avi Kivity
2010-05-06  6:31                     ` Ingo Molnar
2010-05-06  7:04                       ` Peter Zijlstra
2010-05-06  7:11                         ` Ingo Molnar
2010-05-06  7:29                           ` Tejun Heo
2010-05-06  7:33                             ` Tejun Heo
2010-05-05 12:33               ` Avi Kivity
2010-05-05 13:09                 ` Tejun Heo
2010-05-10  5:20             ` Paul Mackerras
2010-05-10  5:48               ` Tejun Heo

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