linux-kernel - Re: [PATCH 00/12] perf: more fixes

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Message-ID: <20160311154145.GE4312@pd.tnic>
Date:	Fri, 11 Mar 2016 16:41:45 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Vince Weaver <vince@...ter.net>, mingo@...nel.org,
	alexander.shishkin@...ux.intel.com, eranian@...gle.com,
	linux-kernel@...r.kernel.org, dvyukov@...gle.com,
	andi@...stfloor.org, jolsa@...hat.com, panand@...hat.com,
	sasha.levin@...cle.com, oleg@...hat.com
Subject: Re: [PATCH 00/12] perf: more fixes

On Fri, Mar 11, 2016 at 03:23:46PM +0100, Peter Zijlstra wrote:
> The below seems to fix the IBS issue tickled by syz-kaller on my
> machine. I've not yet ran perf-fuzzer, which seems able to tickle a
> different set of bugs.
> 
> ---
> Subject: perf, amb: Fix IBS throttle

		 amd

but you know already.

> 
> When the IBS IRQ handler get a !0 return from perf_event_overflow;
> meaning it should throttle the event, it only disables it, it doesn't
> call perf_ibs_stop().
> 
> This confuses the state machine, as we'll use pmu::start() ->
> perf_ibs_start() to unthrottle.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>

Tested-by: Borislav Petkov <bp@...e.de>

I'll leave it running for an additional hour but if I haven't said
anything until then, all is good.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.