From: Ingo Molnar <mingo@elte.hu>
To: Masami Hiramatsu <mhiramat@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Fr??d??ric Weisbecker <fweisbec@gmail.com>,
Steven Rostedt <rostedt@goodmis.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
systemtap <systemtap@sources.redhat.com>,
DLE <dle-develop@lists.sourceforge.net>,
Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Jim Keniston <jkenisto@us.ibm.com>,
Mathieu Desnoyers <compudj@krystal.dyndns.org>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCH tracing/kprobes] kprobes: Disable booster when CONFIG_PREEMPT=y
Date: Fri, 29 Jan 2010 10:21:35 +0100 [thread overview]
Message-ID: <20100129092135.GE10878@elte.hu> (raw)
In-Reply-To: <20100127215531.24775.26807.stgit@dhcp-100-2-132.bos.redhat.com>
* Masami Hiramatsu <mhiramat@redhat.com> wrote:
> Disable kprobe booster when CONFIG_PREEMPT=y, because it can't ensure that
> all kernel threads preempted on kprobe's boosted slot run out from the slot
> even using freeze_processes().
hm, this really sucks as it makes preemptible kernels perform worse. Is there
no better solution?
> The booster on preemptive kernel will be resumed if synchronize_tasks() or
> something like that is introduced.
such as this one?
Ingo
next prev parent reply other threads:[~2010-01-29 9:22 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-22 1:16 [RFC PATCH 00/10] Ftrace functions hashlist Frederic Weisbecker
2010-01-22 1:16 ` [RFC PATCH 01/10] ftrace: Generalize the function hashlist from function profiler Frederic Weisbecker
2010-01-22 1:16 ` [RFC PATCH 02/10] ftrace: Ensure tracing has really stopped before leaving unregister_ftrace_graph Frederic Weisbecker
2010-01-22 1:51 ` Steven Rostedt
2010-01-22 2:04 ` Frederic Weisbecker
2010-01-22 1:16 ` [RFC PATCH 03/10] ftrace: Drop the ftrace_profile_enabled checks in tracing hot path Frederic Weisbecker
2010-01-22 2:05 ` Steven Rostedt
2010-01-22 2:28 ` Mathieu Desnoyers
2010-01-22 3:12 ` Steven Rostedt
2010-01-22 4:09 ` Mathieu Desnoyers
2010-01-22 4:52 ` Steven Rostedt
2010-01-22 12:34 ` Mathieu Desnoyers
2010-01-22 14:54 ` Masami Hiramatsu
2010-01-25 20:58 ` Frederic Weisbecker
2010-01-25 22:14 ` Masami Hiramatsu
2010-01-26 0:41 ` Frederic Weisbecker
2010-01-26 1:13 ` Mathieu Desnoyers
2010-01-26 1:37 ` Masami Hiramatsu
2010-01-27 21:55 ` [PATCH tracing/kprobes] kprobes: Disable booster when CONFIG_PREEMPT=y Masami Hiramatsu
2010-01-28 1:08 ` Mathieu Desnoyers
2010-01-28 4:21 ` Ananth N Mavinakayanahalli
2010-01-29 9:21 ` Ingo Molnar [this message]
2010-01-29 11:30 ` Peter Zijlstra
2010-01-29 14:52 ` Masami Hiramatsu
2010-01-29 17:08 ` Mathieu Desnoyers
2010-01-29 17:15 ` Peter Zijlstra
2010-01-29 17:27 ` Mathieu Desnoyers
2010-01-29 17:32 ` Masami Hiramatsu
2010-01-22 2:43 ` [RFC PATCH 03/10] ftrace: Drop the ftrace_profile_enabled checks in tracing hot path Frederic Weisbecker
2010-01-22 3:05 ` Steven Rostedt
2010-01-25 20:52 ` Frederic Weisbecker
2010-01-22 1:16 ` [RFC PATCH 04/10] ftrace: Ensure buffers are visibles to tracing callbacks right away Frederic Weisbecker
2010-01-22 1:16 ` [RFC PATCH 05/10] ftrace: Drop buffer check in function profiler callbacks Frederic Weisbecker
2010-01-25 6:17 ` Lai Jiangshan
2010-01-30 20:47 ` Frederic Weisbecker
2010-01-22 1:16 ` [RFC PATCH 06/10] ftrace: Release the function hlist if we don't need it anymore Frederic Weisbecker
2010-01-25 6:41 ` Lai Jiangshan
2010-01-30 21:14 ` Frederic Weisbecker
2010-01-22 1:16 ` [RFC PATCH 07/10] ftrace: Make the function hashlist concurrently usable Frederic Weisbecker
2010-01-22 1:16 ` [PATCH 08/10] tracing: Simplify test for function_graph tracing Frederic Weisbecker
2010-01-22 1:16 ` [RFC PATCH 09/10] tracing: Use the hashlist for graph function Frederic Weisbecker
2010-01-25 8:50 ` Lai Jiangshan
2010-01-30 21:19 ` Frederic Weisbecker
2010-01-22 1:16 ` [RFC PATCH 10/10] ftrace: Factorize search and insertion in the function hashlist Frederic Weisbecker
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