Re: [PATCH] perf, tools, script: Allow adding and removing fields

Jiri Olsa
2017-05-05T07:57:59Z

On Thu, May 04, 2017 at 03:26:20PM -0700, Andi Kleen wrote:
> On Tue, May 02, 2017 at 08:41:47AM +0200, Jiri Olsa wrote:
> > On Mon, May 01, 2017 at 12:47:46PM -0700, Andi Kleen wrote:
> > > From: Andi Kleen <ak@linux.intel.com>
> > >
> > > With perf script it is common that we just want to add or remove a field.
> > > Currently this requires figuring out the long list of default fields and
> > > specifying them first, and then adding/removing the new field.
> > >
> > > This patch adds a new + - syntax to merely add or remove fields,
> > > that allows more succint and clearer command lines
> > >
> > > For example to remove the comm field from PMU samples:
> > >
> > > Previously
> > >
> > > perf script -F pid,cpu,time,event,sym,ip,dso,period
> > > 0 [000] 504345.383126: 1 cycles: ffffffff90060c66 native_write_msr ([kernel.kallsyms])
> > >
> > > with the new syntax
> > >
> > > perf script -F -comm
> > > 0 [000] 504345.383126: 1 cycles: ffffffff90060c66 native_write_msr ([kernel.kallsyms])
> >
> >
> > I haven't checked deeply yet, but I'm getting different pids
> > with the new syntax, perhaps some mixing with tids column?
>
> Cannot reproduce. Do you have an exact command line?
>
> The patch shouldn't really change any columns.
>

[jolsa@krava perf]$ ./perf record -a
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.527 MB perf.data (2533 samples) ]

[jolsa@krava perf]$ ./perf script -F pid,cpu,time,event,sym,ip,dso,period > 1
Failed to open /tmp/perf-1841.map, continuing without symbols
/run/user/1000/orcexec.1yoPtl was updated (is prelink enabled?). Restart the long running apps that use it!
[vdso] with build id 0b94eba680f6a3bb2e3efbde9a2551c1f5b27e34 not found, continuing without symbols
[jolsa@krava perf]$ ./perf script -F -comm > 2
Failed to open /tmp/perf-1841.map, continuing without symbols
/run/user/1000/orcexec.1yoPtl was updated (is prelink enabled?). Restart the long running apps that use it!
[vdso] with build id 0b94eba680f6a3bb2e3efbde9a2551c1f5b27e34 not found, continuing without symbols
[jolsa@krava perf]$ diff -puw 1 2 | head -20
--- 1 2017-05-05 09:56:00.088148174 +0200
+++ 2 2017-05-05 09:56:04.469166203 +0200
@@ -6,16 +6,16 @@
0 [000] 10374.768173: 1680 cycles: ffffffff94116904 __next_timer_interrupt ([kernel.kallsyms])
0 [000] 10374.768174: 32136 cycles: ffffffff94116904 __next_timer_interrupt ([kernel.kallsyms])
0 [000] 10374.768187: 846579 cycles: ffffffff9484f3f6 __schedule ([kernel.kallsyms])
- 1706 [000] 10374.774848: 2417537 cycles: 7f362deaaf5e [unknown] (/usr/lib64/firefox/libxul.so)
- 1706 [003] 10374.775161: 31151 cycles: ffffffff940dc520 update_blocked_averages ([kernel.kallsyms])
- 1841 [002] 10374.775163: 41524 cycles: ffffffff940f3ec9 queued_spin_lock_slowpath ([kernel.kallsyms])
+ 1769 [000] 10374.774848: 2417537 cycles: 7f362deaaf5e [unknown] (/usr/lib64/firefox/libxul.so)
+ 1723 [003] 10374.775161: 31151 cycles: ffffffff940dc520 update_blocked_averages ([kernel.kallsyms])
+ 1844 [002] 10374.775163: 41524 cycles: ffffffff940f3ec9 queued_spin_lock_slowpath ([kernel.kallsyms])
0 [001] 10374.775168: 24203 cycles: ffffffff940d7e24 sched_clock_idle_wakeup_event ([kernel.kallsyms])
- 1706 [003] 10374.775175: 31151 cycles: ffffffff94704227 copy_msghdr_from_user ([kernel.kallsyms])
+ 1723 [003] 10374.775175: 31151 cycles: ffffffff94704227 copy_msghdr_from_user ([kernel.kallsyms])
1841 [001] 10374.775178: 24203 cycles: 7f298cdb1d1b [unknown] (/usr/lib64/firefox/libxul.so)
- 1841 [002] 10374.775181: 41524 cycles: ffffffff940ead8e __wake_up_common ([kernel.kallsyms])
- 1706 [003] 10374.775188: 94430 cycles: ffffffff9438a7cb selinux_file_permission ([kernel.kallsyms])
+ 1844 [002] 10374.775181: 41524 cycles: ffffffff940ead8e __wake_up_common ([kernel.kallsyms])
+ 1723 [003] 10374.775188: 94430 cycles: ffffffff9438a7cb selinux_file_permission ([kernel.kallsyms])
[jolsa@krava perf]$

jirka