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    Subject[PATCH v2 0/2] ftrace: Add timer-source of walltime for ftrace
    Hi,

    I rebased patchset of "enable ftrace display walltime".

    It can make ftrace display intuitionistic time information to user
    with walltime clock.

    We can get following output by using it:
    # cd /mnt/debugfs/tracing/
    # cat trace_clock
    [local] global walltime
    # echo sched_switch > current_tracer
    # cat trace
    # tracer: sched_switch
    #
    # TASK-PID CPU# TIMESTAMP FUNCTION
    # | | | | |
    bash-3580 [000] 2916.188093: 3580:120:S + [000] 3580:120:S bash
    bash-3580 [000] 2916.188205: 3580:120:S + [000] 3580:120:S bash
    bash-3580 [000] 2916.188538: 3580:120:R + [000] 5:115:S events/0
    bash-3580 [000] 2916.188599: 3580:120:R ==> [000] 5:115:R events/0
    events/0-5 [000] 2916.188669: 5:115:S ==> [000] 3580:120:R bash
    ...
    # echo walltime > trace_clock
    # cat trace
    # tracer: sched_switch
    #
    # TASK-PID CPU# TIMESTAMP FUNCTION
    # | | | | |
    bash-3580 [000] 2009-08-24 18:03:16.500705: 3580:120:S + [000] 3580:120:S bash
    bash-3580 [000] 2009-08-24 18:03:16.500815: 3580:120:S + [000] 3580:120:S bash
    bash-3580 [000] 2009-08-24 18:03:16.500815: 3580:120:S + [000] 3580:120:S bash
    bash-3580 [000] 2009-08-24 18:03:16.500815: 3580:120:S ==> [000] 5:115:R events/0
    events/0-5 [000] 2009-08-24 18:03:16.500815: 5:115:R + [000] 3578:120:S sshd
    ...

    It need to applys on my patch of:
    [PATCH v4 1/2] Add function to convert between calendar time and broken-down time for universal use

    Hi, Thomas,

    To make ftrace's walltime function work, I need to add a tracepoint into xtime's code,
    so we can set ftrace's walltime clockbase when time changed.

    Could you have a look at this patch, and give me your suggestion?

    Changelog:
    v1->v2: Rebase to top of tip tree.

    Thanks
    Zhaolei




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