linux-kernel - Re: [RFC/PATCH 09/38] perf record: Add --index option for building index table

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Message-ID: <20151007121018.GA28390@krava.landal.opennet>
Date:	Wed, 7 Oct 2015 14:10:18 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [RFC/PATCH 09/38] perf record: Add --index option for building
 index table

On Wed, Oct 07, 2015 at 05:21:46PM +0900, Namhyung Kim wrote:
> Hi Jiri,
> 
> On Mon, Oct 5, 2015 at 10:46 PM, Jiri Olsa <jolsa@...hat.com> wrote:
> > On Fri, Oct 02, 2015 at 02:18:50PM +0900, Namhyung Kim wrote:
> >
> > SNIP
> >
> >> +static int record__merge_index_files(struct record *rec, int nr_index)
> >> +{
> >> +     int i;
> >> +     int ret = -ENOMEM;
> >> +     u64 offset;
> >> +     char path[PATH_MAX];
> >> +     struct perf_file_section *idx;
> >> +     struct perf_data_file *file = &rec->file;
> >> +     struct perf_session *session = rec->session;
> >> +     int output_fd = perf_data_file__fd(file);
> >> +
> >> +     /* +1 for header file itself */
> >> +     nr_index++;
> >> +
> >> +     idx = calloc(nr_index, sizeof(*idx));
> >> +     if (idx == NULL)
> >> +             goto out_close;
> >> +
> >> +     offset = lseek(output_fd, 0, SEEK_END);
> >> +
> >> +     idx[0].offset = session->header.data_offset;
> >> +     idx[0].size   = offset - idx[0].offset;
> >> +
> >> +     for (i = 1; i < nr_index; i++) {
> >> +             struct stat stbuf;
> >> +             int fd = rec->fds[i - 1];
> >> +
> >> +             ret = fstat(fd, &stbuf);
> >> +             if (ret < 0)
> >> +                     goto out_close;
> >> +
> >> +             idx[i].offset = offset;
> >> +             idx[i].size   = stbuf.st_size;
> >> +
> >> +             offset += stbuf.st_size;
> >> +
> >> +             if (idx[i].size == 0)
> >> +                     continue;
> >> +
> >> +             ret = copyfile_offset(fd, 0, output_fd, idx[i].offset,
> >> +                                   idx[i].size);
> >> +             if (ret < 0)
> >> +                     goto out_close;
> >> +     }
> >> +
> >> +     session->header.index = idx;
> >> +     session->header.nr_index = nr_index;
> >> +
> >> +     perf_has_index = true;
> >
> > I might have asked earlier, but why is this global? seems like
> > perf_session member to me..
> 
> Yes you did. :-)
> 
> https://lkml.org/lkml/2015/5/19/110

ah right ;-) ok

thanks,
jirka
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