linux-kernel - Re: [PATCH] tools lib traceeveent: Allow for negative numbers in print format

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Date:	Thu, 27 Aug 2015 11:15:54 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH] tools lib traceeveent: Allow for negative numbers in
 print format

Em Thu, Aug 27, 2015 at 03:55:56PM +0200, Vlastimil Babka escreveu:
> On 08/27/2015 03:46 PM, Steven Rostedt wrote:
> >
> >It was reported that "%-8s" does not parse well when used in the printk
> >format. The '-' is what is throwing it off. Allow that to be included.
> >
> >Reported-by: Vlastimil Babka <vbabka@...e.cz>
> 
> Reported-and-tested-by: Vlastimil Babka <vbabka@...e.cz>
> 
> Example before:
> transhuge-stres-10730 [004]  5897.713989: mm_compaction_finished: node=0
> zone=>-<8s order=-2119871790 ret=
> 
> Example after:
> transhuge-stres-4235  [000]   453.149280: mm_compaction_finished: node=0
> zone=ffffffff81815d7a order=9 ret=
> 
> (I will send patches to fix the string handling in the tracepoints so it's
> on par with in-kernel printing via trace_pipe:)
> 
> transhuge-stres-10921 [007] ...1  6307.140205: mm_compaction_finished:
> node=0 zone=Normal   order=9 ret=partial

Thanks, applied and added the before/after reporter notes. It is now in
my perf/core branch.

- Arnaldo
 
> >Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> >---
> >  tools/lib/traceevent/event-parse.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> >diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
> >index cc25f059ab3d..3b01ae137d95 100644
> >--- a/tools/lib/traceevent/event-parse.c
> >+++ b/tools/lib/traceevent/event-parse.c
> >@@ -4754,6 +4754,7 @@ static void pretty_print(struct trace_seq *s, void *data, int size, struct event
> >  			case 'z':
> >  			case 'Z':
> >  			case '0' ... '9':
> >+			case '-':
> >  				goto cont_process;
> >  			case 'p':
> >  				if (pevent->long_size == 4)
> >
--
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