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Message-ID: <20100129092135.GE10878@elte.hu> Date: Fri, 29 Jan 2010 10:21:35 +0100 From: Ingo Molnar <mingo@...e.hu> To: Masami Hiramatsu <mhiramat@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Fr??d??ric Weisbecker <fweisbec@...il.com>, Steven Rostedt <rostedt@...dmis.org> Cc: lkml <linux-kernel@...r.kernel.org>, systemtap <systemtap@...rces.redhat.com>, DLE <dle-develop@...ts.sourceforge.net>, Ananth N Mavinakayanahalli <ananth@...ibm.com>, Frederic Weisbecker <fweisbec@...il.com>, Jim Keniston <jkenisto@...ibm.com>, Mathieu Desnoyers <compudj@...stal.dyndns.org>, Steven Rostedt <rostedt@...dmis.org> Subject: Re: [PATCH tracing/kprobes] kprobes: Disable booster when CONFIG_PREEMPT=y * Masami Hiramatsu <mhiramat@...hat.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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