Re: [PATCH v4 0/4] perf timechart io mode

[David Ahern]

On 6/24/14, 12:51 PM, Jiri Olsa wrote:
> On Tue, Jun 24, 2014 at 11:38:44AM -0600, David Ahern wrote:
> > On 6/24/14, 10:57 AM, Stanislav Fomichev wrote:
> > > On Tue, Jun 24, 2014 at 01:10:22PM +0400, Stanislav Fomichev wrote:
> > > > > hum, got this when trying:
> > > > >
> > > > > [jolsa@krava perf]$ sudo ./perf timechart record -I
> > > > > ^C[ perf record: Woken up 2 times to write data ]
> > > > > [ perf record: Captured and wrote 1.071 MB perf.data (~46806 samples) ]
> > > > > [jolsa@krava perf]$ ./perf timechart
> > > > > Invalid previous event (non-zero)!
> > > > > 0x113f80 [0x8]: failed to process type: 68
> >
> > I see this kind of message a lot, but typically in high event use cases
> > (e.g., 100+MB files in a run of a few seconds). I usually increase the map
> > size (-m 4096) and/or bump the priority of perf (-r1) and re-run the test.
>
> maybe we dont need to fail in this case.. seems like it should
> not be hard to detect, wanr and recover? ;-)

seems to me it should not be happening at all. It seems like the head 
caught the tail and was not properly detected.

David

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/