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

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Message-ID: <CAM9d7cg-UAez_KowSSdKF2aND8v_U-7jFPxz7XFYPnWj=98yAw@mail.gmail.com>
Date:	Wed, 7 Oct 2015 17:21:46 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
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

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


Thanks,
Namhyung
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