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    SubjectRe: [PATCH] perf tools: Exit recording if events have non matching sample type
    Em Thu, Sep 29, 2011 at 04:55:23PM -0600, David Ahern escreveu:
    > On 09/29/2011 04:05 PM, Arnaldo Carvalho de Melo wrote:
    > > Em Thu, Sep 29, 2011 at 06:01:08PM +0200, Jiri Olsa escreveu:
    > >> Following command hangs on my setup:
    > >> ./perf record -o perf.data -e ext4:ext4_mb_new_group_pa \
    > >> -e LLC-loads -- date '+%F'
    > >>
    > >> because hardware and tracepoint events have different sample type.
    > >>
    > >> With the patch applied the record command displays
    > >> "Non matching sample_type" message and exits.
    > >
    > > That is way too cryptic :-\
    > >
    > > What is that makes the sample type not match in this case? Can we make
    > > it match instead?
    > >
    > > This is something to be properly fixed by _allowing_ non matching sample
    > > types, the evsel/evlist abstractions are getting we close but not there
    > > yet, multiple files in a perf.data/ directory are needed.
    >
    > >From what I can see sample_type has to be the same for all samples:
    > https://lkml.org/lkml/2011/8/15/6

    We could add a PERF_SAMPLE_ID2 that if present would be guaranteed to be
    the last, or we can, as PeterZ prefers/suggests, to use one mmap per
    sample id, then we know that if we're getting it on that mmap, it has
    that sample_type.

    For record that means we need to dump each per-sample_id mmap onto a
    separate file, i.e. use a directory, etc.

    But what I suggested as a short term solution was to check what is the
    difference in the above case and then make them use a single sample
    type, i.e. bow to the current restriction.

    - Arnaldo



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