Messages in this thread | | | Date | Wed, 25 Feb 2009 11:31:09 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH 2/4] tracing: add event trace infrastructure |
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* Peter Zijlstra <peterz@infradead.org> wrote:
> On Wed, 2009-02-25 at 01:22 -0800, Andrew Morton wrote: > > > Parse this: > > > > irqsoff latency trace v1.1.5 on 2.6.26-rc8 > > -------------------------------------------------------------------- > > latency: 97 us, #3/3, CPU#0 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:2) > > ----------------- > > | task: swapper-0 (uid:0 nice:0 policy:0 rt_prio:0) > > ----------------- > > => started at: apic_timer_interrupt > > => ended at: do_softirq > > > > # _------=> CPU# > > # / _-----=> irqs-off > > # | / _----=> need-resched > > # || / _---=> hardirq/softirq > > # ||| / _--=> preempt-depth > > # |||| / > > # ||||| delay > > # cmd pid ||||| time | caller > > # \ / ||||| \ | / > > <idle>-0 0d..1 0us+: trace_hardirqs_off_thunk (apic_timer_interrupt) > > <idle>-0 0d.s. 97us : __do_softirq (do_softirq) > > <idle>-0 0d.s1 98us : trace_hardirqs_on (do_softirq) > > > > your time starts now. > > awk '/^#/ { start=1; next } { if (!start) next; .... }'
yeah.
For /debug/tracing/trace the convention is that a simple:
grep -v '^#'
pattern will filter out the header as "comments".
Ingo
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