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Message-ID: <alpine.LFD.2.00.0905201229280.5983@localhost.localdomain> Date: Wed, 20 May 2009 12:31:36 +0200 (CEST) From: Thomas Gleixner <tglx@...utronix.de> To: Anton Blanchard <anton@...ba.org> cc: rostedt@...dmis.org, mingo@...e.hu, tzanussi@...il.com, jbaron@...hat.com, linux-kernel@...r.kernel.org Subject: Re: [PATCH] tracing/events: Add timer and high res timer tracepoints On Wed, 20 May 2009, Anton Blanchard wrote: > > Add tracepoints for timer and high res timer execution. We add entry and > exit tracepoints so we can calculate timer latency. > > Example ftrace output: > > <idle>-0 [000] 264.040506: hrtimer_entry: func=.tick_sched_timer+0x0/0xf0 > <idle>-0 [000] 264.040508: hrtimer_exit: func=.tick_sched_timer+0x0/0xf0 restart=HRTIMER_RESTART > <idle>-0 [000] 264.040530: timer_entry: func=.e1000_watchdog+0x0/0x8fc > <idle>-0 [000] 264.040728: timer_exit: func=.e1000_watchdog+0x0/0x8fc > > Here we can see e1000_watchdog is taking 0.2ms - it might make sense to > move this into a workqueue or kernel thread. Cute. That should help us to pinpoint more such timer abusers :) > Signed-off-by: Anton Blanchard <anton@...ba.org> Acked-by: Thomas Gleixner <tglx@...utronix.de> -- 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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