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Message-ID: <20170525080917.GJ14467@krava>
Date: Thu, 25 May 2017 10:09:17 +0200
From: Jiri Olsa <jolsa@...hat.com>
To: David Carrillo-Cisneros <davidcc@...gle.com>
Cc: linux-kernel@...r.kernel.org,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Andi Kleen <ak@...ux.intel.com>, Simon Que <sque@...omium.org>,
Wang Nan <wangnan0@...wei.com>, Jiri Olsa <jolsa@...nel.org>,
He Kuang <hekuang@...wei.com>,
Masami Hiramatsu <mhiramat@...nel.org>,
David Ahern <dsa@...ulusnetworks.com>,
Namhyung Kim <namhyung@...nel.org>,
Stephane Eranian <eranian@...gle.com>,
Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH v2 10/13] perf header: add a buffer to struct feat_fd
On Tue, May 23, 2017 at 12:48:50AM -0700, David Carrillo-Cisneros wrote:
SNIP
> @@ -795,11 +831,19 @@ static int write_pmu_mappings(struct feat_fd *fd,
> struct perf_evlist *evlist __maybe_unused)
> {
> struct perf_pmu *pmu = NULL;
> - off_t offset = lseek(fd->fd, 0, SEEK_CUR);
> - __u32 pmu_num = 0;
> + u32 pmu_num = 0;
> int ret;
>
> - /* write real pmu_num later */
> + /*
> + * Do a first pass to count number of pmu to avoid lseek so this
> + * works in pipe mode as well.
> + */
> + while ((pmu = perf_pmu__scan(pmu))) {
> + if (!pmu->name)
> + continue;
> + pmu_num++;
> + }
please put this functionality into preceeding separate patch
thanks,
jirka
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