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

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Date:	Tue, 24 Jun 2014 20:57:12 +0400
From:	Stanislav Fomichev <stfomichev@...dex-team.ru>
To:	linux-kernel@...r.kernel.org
Cc:	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...hat.com,
	acme@...nel.org, namhyung@...nel.org, artagnon@...il.com,
	rusty@...tcorp.com.au, bp@...e.de, Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH v4 0/4] perf timechart io mode

On Tue, Jun 24, 2014 at 01:10:22PM +0400, Stanislav Fomichev wrote:
> > hum, got this when trying:
> > 
> > [jolsa@...va 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@...va perf]$ ./perf timechart
> > Invalid previous event (non-zero)!
> > 0x113f80 [0x8]: failed to process type: 68
> Hm, I added a bunch of consistency checks which I couldn't actually hit
> myself. Nice work :-) Can I get you perf.data?

For some reason, in Jiri's trace we see exit from sys_read with 2,
and then again exit from sys_read with -EAGAIN:
            xterm 32028 [000] 43390.908909: syscalls:sys_enter_read: fd: 0x00000004, buf: 0x02076e8c, count: 0x0
            xterm 32028 [000] 43390.908917: syscalls:sys_exit_read: 0x2
            xterm 32028 [000] 43390.908982: syscalls:sys_exit_read: 0xfffffffffffffff5

I'm not sure how it is possible (either we lost sys_enter, or timestamp
of seconds -EAGAIN is wrong?). I think we might just convert this error
to a warning (we couldn't reproduce it again).
Should I resend the whole series (preferred) or add another patch on
top?
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