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    SubjectRe: [PATCH] perf: make perf report -D print sampled CPU
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    On Fri, May 28, 2010 at 3:37 PM, Arnaldo Carvalho de Melo
    <acme@infradead.org> wrote:
    > Em Fri, May 28, 2010 at 03:03:15PM +0200, Stephane Eranian escreveu:
    >> On Fri, May 28, 2010 at 2:57 PM, Arnaldo Carvalho de Melo
    >> <acme@infradead.org> wrote:
    >> > Em Fri, May 28, 2010 at 12:08:01PM +0200, Stephane Eranian escreveu:
    >> >> When -R is not used, cpu is set to -1to indicate that
    >> >> the CPU is unknown (it is not captured).
    >
    >> > It conflicts with Arun's patch for sorting by CPU that I started playing with
    >> > yesterday, but in a good way, i.e. printing the CPU at that dump_printf spot
    >> > was one of the changs I made in Arun's patch as well.
    >
    >> Yes, I realized that afterwards.
    >
    >> > [root@emilia linux-2.6-tip]# perf report -D | grep SAMPLE | head -6
    >> > 0x10240 [0x28]: PERF_RECORD_SAMPLE(IP, 1): 2 17252/17252: 0xffffffff81253362 period: 1894446
    >> > 0x10268 [0x28]: PERF_RECORD_SAMPLE(IP, 1): 2 17252/17252: 0xffffffff81253338 period: 1894446
    >> > 0x10290 [0x28]: PERF_RECORD_SAMPLE(IP, 1): 2 17252/17252: 0xffffffff8125300d period: 1905103
    >> > 0x102b8 [0x28]: PERF_RECORD_SAMPLE(IP, 1): 0 0/0: 0xffffffff8109117d period: 1838260
    >> > 0x102e0 [0x28]: PERF_RECORD_SAMPLE(IP, 1): 0 293/293: 0xffffffff8101ace6 period: 352697
    >> > 0x10308 [0x28]: PERF_RECORD_SAMPLE(IP, 1): 0 1763/1763: 0xffffffff8101ace6 period: 352697
    >> > [root@emilia linux-2.6-tip]#
    >
    >> > I added it just before the pid/tid but prefixing it with "cpu: " is as good as
    >> > doing it that way.
    >
    >> Fine. I think there needs to be some documenation explaining the structure
    >> of the line here. I had to dig into the code to understand it.
    >
    > Right, this so far is as ad-hoc as it can be :-)
    >
    > One idea that is in my TODO list is to generate some XML format people
    > say that oprofile produces and there is also some other format that a
    > valgrind tool uses that should be supported.
    >
    I think for a lot of people what matter is that the format be easily parseable
    by Python/Perl scripts. XML may be fine too.

    > I also plan to have it in a spreadsheet TUI widget, allowing lots of
    > navigation gimmicks to help in debugging, like a popup that offers the
    > list of mmaps for the thread where the sample below the cursor happened,
    > etc.
    You may get tons of data. Not sure you could manage interactively.


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