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    SubjectRe: [PATCH 2/4] tracing: add event trace infrastructure

    * 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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