Date: Thu, 27 Nov 2014 12:16:26 -0200
From: Arnaldo Carvalho de Melo <acme@redhat.com>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>, Jiri Olsa <jolsa@kernel.org>,
        linux-kernel@vger.kernel.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andi Kleen <ak@linux.intel.com>,
        Corey Ashford <cjashfor@linux.vnet.ibm.com>,
        David Ahern <dsahern@gmail.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Matt Fleming <matt.fleming@intel.com>,
        Namhyung Kim <namhyung@kernel.org>, Paul Mackerras <paulus@samba.org>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH] perf tools: Do not fail on processing out of order event
Message-ID: <20141127141626.GK3808@redhat.com>
References: <1417016371-30249-1-git-send-email-jolsa@kernel.org>
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 <20141127105603.GA1987@gmail.com>
 <20141127135259.GI3808@redhat.com>
 <20141127140707.GB25752@krava.brq.redhat.com>
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Em Thu, Nov 27, 2014 at 03:07:07PM +0100, Jiri Olsa escreveu:
> On Thu, Nov 27, 2014 at 11:53:00AM -0200, Arnaldo Carvalho de Melo wrote:
> > Em Thu, Nov 27, 2014 at 11:56:03AM +0100, Ingo Molnar escreveu:
> > > Arnaldo, I suppose the fix will go upstream via your tree, as a 
> > > pull request for v3.18 fixes?

> > Right, I can do that.

> > And I agree with the "expected" for events that are out of the current
> > reordering window, i.e. we can't insert something into previous windows,
> > so those are, humm, what would be a good name:
> > stats->out_of_reordering_window, while stats->reordered, would be for
> > events that were found out of order, but were successfully sorted as
> > part of a flush operation, right?
 
> the forced flush is when we find out we crossed the allowed allocation
> space for the samples queue.. so we take the half of the sorted queue
> and flush it.. for this case we break the flushing logic and we might

Well, we make it more likely than without a forced flush to find out of
order events, because the window suddenly became smaller, its like we
found a FLUSH event right there, no?

> (probably just in theory) get out of order events
 
> but IMO both cases of out of order event are equal.. we dont do
> anything special for forced flushed AFAIK

- Arnaldo
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