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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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