linux-kernel - Re: [PATCH] perf trace: remove redundant ')'

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Date:   Fri, 16 Mar 2018 09:50:45 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     "Du, Changbin" <changbin.du@...el.com>
Cc:     jolsa@...hat.com, peterz@...radead.org, mingo@...hat.com,
        namhyung@...nel.org, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf trace: remove redundant ')'

Em Fri, Mar 16, 2018 at 03:51:09PM +0800, Du, Changbin escreveu:
> Hi Arnaldo, How about this simple one? Thanks.
> 
> On Tue, Mar 13, 2018 at 06:40:01PM +0800, changbin.du@...el.com wrote:
> > From: Changbin Du <changbin.du@...el.com>
> > 
> > There is a redundant ')' at the tail of each event. So remove it.
> > $ sudo perf trace --no-syscalls -e 'kmem:*' -a
> >    899.342 kmem:kfree:(vfs_writev+0xb9) call_site=ffffffff9c453979 ptr=(nil))
> >    899.344 kmem:kfree:(___sys_recvmsg+0x188) call_site=ffffffff9c9b8b88 ptr=(nil))
> > 
> > Signed-off-by: Changbin Du <changbin.du@...el.com>
> > ---
> >  tools/perf/builtin-trace.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
> > index e7f1b18..7273f5f 100644
> > --- a/tools/perf/builtin-trace.c
> > +++ b/tools/perf/builtin-trace.c
> > @@ -1959,7 +1959,7 @@ static int trace__event_handler(struct trace *trace, struct perf_evsel *evsel,
> >  				      trace->output);
> >  	}
> >  
> > -	fprintf(trace->output, ")\n");
> > +	fprintf(trace->output, "\n");

It looks simple on the surface, but I couldn't quickly recall why this
')' was put there in the first place... So I left for later to do a 'git
blame' on this file, etc.

- Arnaldo

> >  	if (callchain_ret > 0)
> >  		trace__fprintf_callchain(trace, sample);
> > -- 
> > 2.7.4
> > 
> 
> -- 
> Thanks,
> Changbin Du