Re: [PATCH] perf tools: Exit recording if events have non matchingsample type

From: Jiri Olsa
Date: Mon Oct 03 2011 - 06:23:05 EST

On Thu, Sep 29, 2011 at 07:05:48PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Thu, Sep 29, 2011 at 06:01:08PM +0200, Jiri Olsa escreveu:
> > The event processing relies on all events having the same sample_type.
> >
> > This is being checked when the session is being opened read only.
> > It also needs to be checked when we do record, since events could be
> > read during processing build IDs at the end of the record command.
> >
> > If we process events with different sample_type the processing might
> > skip some events or hang.
> >
> > Following command hangs on my setup:
> > ./perf record -o -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 directory are needed.
> Till then can you check if we can make it match or else just say that
> the mix of events is not yet supported, please collect them in different
> sessions or something along those lines?
> - Arnaldo
thanks for comments..
I just was this got in the tip tree git://

perf tools: Exit record if events have non matching sample type
commit 6f9a4869e15de8af2fd715af876bc3e6b00757a7
Author: Jiri Olsa <jolsa@xxxxxxxxxx>
Date: Thu Sep 29 19:49:50 2011 +0200

I've read the email trail.. I'll check the sources and try to come up
with something.. ;)

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