From: Peter Zijlstra <peterz@infradead.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Dongsheng Yang <dongsheng081251@gmail.com>,
"yangds.fnst" <yangds.fnst@cn.fujitsu.com>,
linux-kernel@vger.kernel.org, mingo@redhat.com,
bsegall@google.com
Subject: Re: [PATCH] sched: Distinguish sched_wakeup event when wake up a task which did schedule out or not.
Date: Mon, 12 May 2014 17:28:18 +0200 [thread overview]
Message-ID: <20140512152818.GS30445@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20140512111748.1c2f6cd9@gandalf.local.home>
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On Mon, May 12, 2014 at 11:17:48AM -0400, Steven Rostedt wrote:
> On Mon, 12 May 2014 17:09:50 +0200
> Peter Zijlstra <peterz@infradead.org> wrote:
>
> > > Point being, this is useful information, why not pass it to userspace?
> >
> > Because it adds code to one of the hottest code paths in the kernel and
> > so far nobody had a sane explanation of WTF they were doing.
> >
>
> Is there a measurable difference with these extra tracepoints?
Dunno, nobody tried and reported. I suppose its sitting there along with
the coherent changelog.
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next prev parent reply other threads:[~2014-05-12 15:28 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-15 12:32 [PATCH 0/8] perf sched: Add trace event for sched wait Dongsheng Yang
2014-04-15 12:32 ` [PATCH 1/8] sched & trace: Add a trace event for wait Dongsheng Yang
2014-04-15 13:49 ` Peter Zijlstra
2014-04-16 14:23 ` Steven Rostedt
2014-04-15 12:32 ` [PATCH 2/8] sched/wait: Add trace point before add task into wait queue Dongsheng Yang
2014-04-15 12:32 ` [PATCH 3/8] sched/wait: Use __add_wait_queue{_tail}_exclusive() as possible Dongsheng Yang
2014-04-15 13:49 ` Peter Zijlstra
2014-04-16 9:51 ` Dongsheng Yang
2014-04-15 12:32 ` [PATCH 4/8] sched/core: Skip wakeup when task is already running Dongsheng Yang
2014-04-15 13:53 ` Peter Zijlstra
2014-04-16 10:22 ` Dongsheng Yang
2014-04-22 11:56 ` Dongsheng Yang
2014-04-22 13:23 ` Peter Zijlstra
2014-04-22 17:10 ` bsegall
2014-04-22 17:53 ` Steven Rostedt
2014-04-22 18:18 ` Peter Zijlstra
2014-05-05 6:32 ` Dongsheng Yang
2014-05-05 6:34 ` [PATCH] sched: Move the wakeup tracepoint from ttwu_do_wakeup() to ttwu_activate() Dongsheng Yang
2014-05-05 14:00 ` Steven Rostedt
2014-05-06 0:19 ` Dongsheng Yang
2014-05-06 0:26 ` Dongsheng Yang
2014-05-06 2:06 ` Steven Rostedt
2014-05-06 1:29 ` Dongsheng Yang
2014-05-06 1:52 ` [PATCH] sched: Distinguish sched_wakeup event when wake up a task which did schedule out or not Dongsheng Yang
2014-05-09 0:16 ` Dongsheng Yang
2014-05-09 1:27 ` Steven Rostedt
2014-05-10 15:29 ` Peter Zijlstra
[not found] ` <536F90BE.2080806@gmail.com>
2014-05-11 15:24 ` Fwd: " Dongsheng Yang
2014-05-11 16:35 ` Peter Zijlstra
2014-05-11 18:52 ` Steven Rostedt
2014-05-12 6:47 ` Peter Zijlstra
2014-05-12 8:58 ` Dongsheng Yang
2014-05-12 14:09 ` Steven Rostedt
2014-05-12 15:09 ` Peter Zijlstra
2014-05-12 15:17 ` Steven Rostedt
2014-05-12 15:28 ` Peter Zijlstra [this message]
2014-04-15 12:32 ` [PATCH 5/8] perf tools: record and process sched:sched_wait event Dongsheng Yang
2014-04-15 12:32 ` [PATCH 6/8] perf tools: add missing event for perf sched record Dongsheng Yang
2014-04-15 12:32 ` [PATCH 7/8] perf tools: Adapt the TASK_STATE_TO_CHAR_STR to new value in kernel space Dongsheng Yang
2014-04-15 12:32 ` [PATCH 8/8] perf tools: Clarify the output of perf sched map Dongsheng Yang
2014-04-15 13:54 ` [PATCH 0/8] perf sched: Add trace event for sched wait Peter Zijlstra
2014-04-16 10:28 ` Dongsheng Yang
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