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    SubjectRe: [PATCH 3/3] perf events: add timehist option to record and report
    On Fri, 2011-02-18 at 11:07 -0700, David Ahern wrote:
    > We want not only context-switch events, but the stack trace at the
    > switch.

    Both ftrace and perf can do that:

    perf record -ge sched:sched_switch -c 1


    echo 1 > /debug/tracing/options/stacktrace

    > That data along with the gettimeofday timestamp has allowed us to
    > resolve performance issues such as a system call taking longer than
    > expected during a specific sequence of events or a process getting
    > preempted and not scheduled for N seconds. etc., etc.

    Non of that seems to require GTOD stamps.

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      Last update: 2011-02-18 19:41    [W:0.023 / U:13.644 seconds]
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