linux-kernel - Re: [PATCH] perf record: Fix perf.data size in no-buildid mode

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Message-ID: <20150605144432.GM32707@kernel.org>
Date:	Fri, 5 Jun 2015 11:44:32 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	He Kuang <hekuang@...wei.com>
Cc:	mingo@...hat.com, a.p.zijlstra@...llo.nl, namhyung@...nel.org,
	wangnan0@...wei.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf record: Fix perf.data size in no-buildid mode

Em Fri, Jun 05, 2015 at 07:40:16PM +0800, He Kuang escreveu:
> 
> ping..

Thanks, applied.

- Arnaldo

> On 2015/5/28 21:17, He Kuang wrote:
> >The size of perf.data is missing update in no-buildid mode, which gives
> >wrong output result.
> >
> >Before this patch:
> >
> >   $ perf.perf record -B -e syscalls:sys_enter_open uname
> >   Linux
> >   [ perf record: Woken up 1 times to  write data ]
> >   [ perf record: Captured and wrote 0.000 MB perf.data ]
> >
> >After this patch:
> >
> >   $ perf.perf record -B -e syscalls:sys_enter_open uname
> >   Linux
> >   [ perf record: Woken up 1 times to write data ]
> >   [ perf record: Captured and wrote 0.001 MB perf.data ]
> >
> >Signed-off-by: He Kuang <hekuang@...wei.com>
> >---
> >  tools/perf/builtin-record.c | 6 ++----
> >  1 file changed, 2 insertions(+), 4 deletions(-)
> >
> >diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> >index 91aa2a3..d3731cc 100644
> >--- a/tools/perf/builtin-record.c
> >+++ b/tools/perf/builtin-record.c
> >@@ -345,12 +345,9 @@ static int process_buildids(struct record *rec)
> >  	struct perf_data_file *file  = &rec->file;
> >  	struct perf_session *session = rec->session;
> >
> >-	u64 size = lseek(perf_data_file__fd(file), 0, SEEK_CUR);
> >-	if (size == 0)
> >+	if (file->size == 0)
> >  		return 0;
> >
> >-	file->size = size;
> >-
> >  	/*
> >  	 * During this process, it'll load kernel map and replace the
> >  	 * dso->long_name to a real pathname it found.  In this case
> >@@ -719,6 +716,7 @@ out_child:
> >
> >  	if (!err && !file->is_pipe) {
> >  		rec->session->header.data_size += rec->bytes_written;
> >+		file->size = lseek(perf_data_file__fd(file), 0, SEEK_CUR);
> >
> >  		if (!rec->no_buildid) {
> >  			process_buildids(rec);
> >
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