From: Borislav Petkov <bp@alien8.de>
To: Maria Dimakopoulou <maria.n.dimakopoulou@gmail.com>
Cc: Stephane Eranian <eranian@google.com>,
Matt Fleming <matt@console-pimps.org>,
LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
"mingo@elte.hu" <mingo@elte.hu>,
"ak@linux.intel.com" <ak@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>,
"Yan, Zheng" <zheng.z.yan@intel.com>
Subject: Re: [PATCH 9/9] perf/x86: add syfs entry to disable HT bug workaround
Date: Thu, 5 Jun 2014 17:17:34 +0200 [thread overview]
Message-ID: <20140605151734.GD16811@pd.tnic> (raw)
In-Reply-To: <CAHzUATiVCHytrG3sz8AmC8anZTQcPDRHp91-kWEoeq=RU7UNiw@mail.gmail.com>
On Thu, Jun 05, 2014 at 05:45:24PM +0300, Maria Dimakopoulou wrote:
> The issue is that the outcoming leaked counts are not compensated
> by the incoming leaked counts of the sibling thread. With the workaround,
> corrupting events are always scheduled with an empty sibling counter.
> This means that their leaked counts are lost. So it is expected to see
> lower counts with the workaround. Note that this is not a side-effect of
> the workaround; leaked counts are expected to be lost with nothing
> measured on the sibling counter in general.
>
> In a second series we intend to re-integrate the counts for counting mode
> events. The workaround makes this easier because it guarantees
> that the sibling counter is unused, thus its counts are purely leaked
> counts and they can be safely re-integrated.
IIUC, sounds to me like reintegrating the leaked counts from the unused
counter should be part of the workaround too, not a second series...
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
--
next prev parent reply other threads:[~2014-06-05 15:19 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-04 21:34 [PATCH 0/9] perf/x86: implement HT counter corruption workaround Stephane Eranian
2014-06-04 21:34 ` [PATCH 1/9] perf,x86: rename er_flags to flags Stephane Eranian
2014-06-04 21:34 ` [PATCH 2/9] pref/x86: vectorize cpuc->kfree_on_online Stephane Eranian
2014-06-04 21:34 ` [PATCH 3/9] perf/x86: add 3 new scheduling callbacks Stephane Eranian
2014-06-04 21:34 ` [PATCH 4/9] perf/x86: add cross-HT counter exclusion infrastructure Stephane Eranian
2014-06-05 7:47 ` Peter Zijlstra
2014-06-05 10:51 ` Stephane Eranian
2014-06-05 8:04 ` Peter Zijlstra
2014-06-05 13:36 ` Maria Dimakopoulou
2014-06-05 8:29 ` Peter Zijlstra
2014-06-05 21:33 ` Andi Kleen
2014-06-05 21:38 ` Stephane Eranian
2014-06-10 11:53 ` Stephane Eranian
2014-06-10 12:26 ` Peter Zijlstra
2014-06-04 21:34 ` [PATCH 5/9] perf/x86: implement cross-HT corruption bug workaround Stephane Eranian
2014-06-05 13:38 ` Peter Zijlstra
2014-06-05 13:42 ` Peter Zijlstra
2014-06-05 13:48 ` Peter Zijlstra
2014-06-05 14:01 ` Maria Dimakopoulou
2014-06-05 14:04 ` Borislav Petkov
2014-06-05 14:11 ` Peter Zijlstra
2014-06-05 14:14 ` Peter Zijlstra
2014-06-05 14:24 ` Maria Dimakopoulou
2014-06-05 14:04 ` Peter Zijlstra
2014-06-05 14:15 ` Stephane Eranian
2014-06-05 14:21 ` Peter Zijlstra
2014-06-05 14:26 ` Stephane Eranian
2014-06-05 14:31 ` Peter Zijlstra
2014-06-05 15:31 ` Stephane Eranian
2014-06-04 21:34 ` [PATCH 6/9] perf/x86: enforce HT bug workaround for SNB/IVB/HSW Stephane Eranian
2014-06-04 21:34 ` [PATCH 7/9] perf/x86: enforce HT bug workaround with PEBS " Stephane Eranian
2014-06-04 21:34 ` [PATCH 8/9] perf/x86: fix intel_get_event_constraints() for dynamic constraints Stephane Eranian
2014-06-04 21:34 ` [PATCH 9/9] perf/x86: add syfs entry to disable HT bug workaround Stephane Eranian
2014-06-05 8:32 ` Matt Fleming
2014-06-05 9:29 ` Stephane Eranian
2014-06-05 10:01 ` Matt Fleming
2014-06-05 10:19 ` Stephane Eranian
2014-06-05 11:16 ` Matt Fleming
2014-06-05 12:02 ` Stephane Eranian
2014-06-05 13:27 ` Borislav Petkov
2014-06-05 13:42 ` Stephane Eranian
2014-06-05 14:03 ` Borislav Petkov
2014-06-05 14:45 ` Maria Dimakopoulou
2014-06-05 15:17 ` Borislav Petkov [this message]
2014-06-05 16:39 ` Maria Dimakopoulou
2014-06-05 16:47 ` Stephane Eranian
2014-06-05 16:52 ` Borislav Petkov
2014-06-05 18:00 ` Maria Dimakopoulou
2014-06-05 23:29 ` Andi Kleen
2014-06-06 8:28 ` Matt Fleming
2014-06-05 12:50 ` Peter Zijlstra
2014-06-05 12:55 ` Stephane Eranian
2014-06-05 12:59 ` Peter Zijlstra
2014-06-05 13:16 ` Stephane Eranian
2014-06-05 13:26 ` Peter Zijlstra
2014-06-05 13:19 ` Peter Zijlstra
2014-06-05 13:26 ` Stephane Eranian
2014-06-04 22:28 ` [PATCH 0/9] perf/x86: implement HT counter corruption workaround Andi Kleen
2014-06-05 12:45 ` Stephane Eranian
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