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

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Date:   Tue, 2 May 2017 08:41:47 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] perf, tools, script: Allow adding and removing fields

On Mon, May 01, 2017 at 12:47:46PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.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?

     0 [002] 42615.004240:       2172 cycles:  ffffffff86060c66 native_write_msr ([kernel.kallsyms])
     0 [002] 42615.004242:      19857 cycles:  ffffffff860abee0 irq_exit ([kernel.kallsyms])
     0 [002] 42615.004250:     412618 cycles:  ffffffff860d1429 ttwu_do_wakeup ([kernel.kallsyms])
- 1798 [001] 42615.008219:      46557 cycles:  ffffffff860dc718 update_blocked_averages ([kernel.kallsyms])
- 1798 [001] 42615.008239:      46557 cycles:      7f313dff0684 [unknown] (/usr/lib64/firefox/libxul.so)
- 1798 [001] 42615.008258:     112387 cycles:      7f313e32c71a [unknown] (/usr/lib64/firefox/libxul.so)
+ 1861 [001] 42615.008219:      46557 cycles:  ffffffff860dc718 update_blocked_averages ([kernel.kallsyms])
+ 1861 [001] 42615.008239:      46557 cycles:      7f313dff0684 [unknown] (/usr/lib64/firefox/libxul.so)
+ 1861 [001] 42615.008258:     112387 cycles:      7f313e32c71a [unknown] (/usr/lib64/firefox/libxul.so)
  1687 [002] 42615.008268:    1711528 cycles:  ffffffffc01e74c7 i915_gem_set_domain_ioctl ([i915])
- 1798 [001] 42615.008303:     281652 cycles:  ffffffff860dc169 account_entity_dequeue ([kernel.kallsyms])
+ 1861 [001] 42615.008303:     281652 cycles:  ffffffff860dc169 account_entity_dequeue ([kernel.kallsyms])
  1798 [001] 42615.008440:     442473 cycles:      7f3147c6935b g_slice_free1 (/usr/lib64/libglib-2.0.so.0.5000.3)
- 1935 [001] 42615.009462:     487718 cycles:  ffffffff860f25bc cpuacct_charge ([kernel.kallsyms])
- 1935 [002] 42615.009955:    1711528 cycles:      7fa2a2ac748f [unknown] (/usr/lib64/firefox/libmozavcodec.so)
- 1935 [001] 42615.009989:     441676 cycles:      559627e901da [unknown] (/usr/lib64/firefox/firefox)
- 1935 [000] 42615.010233:      79099 cycles:      7fa2c2a11fa9 [unknown] (/usr/lib64/firefox/libxul.so)
+24128 [001] 42615.009462:     487718 cycles:  ffffffff860f25bc cpuacct_charge ([kernel.kallsyms])
+24182 [002] 42615.009955:    1711528 cycles:      7fa2a2ac748f [unknown] (/usr/lib64/firefox/libmozavcodec.so)
+24181 [001] 42615.009989:     441676 cycles:      559627e901da [unknown] (/usr/lib64/firefox/firefox)
+24112 [000] 42615.010233:      79099 cycles:      7fa2c2a11fa9 [unknown] (/usr/lib64/firefox/libxul.so)

thanks,
jirka