From: Peter Zijlstra <peterz@infradead.org>
To: Stephane Eranian <eranian@google.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Oleg Nesterov <oleg@redhat.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>
Subject: Re: [RFC][PATCH] perf, intel: Don't touch MSR_IA32_DEBUGCTLMSR from NMI context
Date: Wed, 12 Sep 2012 19:45:11 +0200 [thread overview]
Message-ID: <1347471911.15764.72.camel@twins> (raw)
In-Reply-To: <1347471446.15764.67.camel@twins>
On Wed, 2012-09-12 at 19:37 +0200, Peter Zijlstra wrote:
> Ah, so I do think EIO will re-enable LBR,
OK, it does not, but the:
> also the handler is wrapped in
> x86_pmu::{dis,en}able_all() which does end up calling
> intel_pmu_lbr_{dis,en}able_all().
Thing does the re-enable for us,
> However that leaves the MSR in the
> exact same state on exit as it was on enter, so that's not a problem for
> the: read-modify-write change.
in a safe way.
next prev parent reply other threads:[~2012-09-12 17:45 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-12 16:22 [RFC][PATCH] perf, intel: Don't touch MSR_IA32_DEBUGCTLMSR from NMI context Peter Zijlstra
2012-09-12 16:42 ` Stephane Eranian
2012-09-12 17:37 ` Peter Zijlstra
2012-09-12 17:45 ` Peter Zijlstra [this message]
2012-09-12 18:00 ` Stephane Eranian
2012-09-12 18:17 ` Peter Zijlstra
2012-09-12 18:50 ` Stephane Eranian
2012-09-12 18:52 ` Peter Zijlstra
2012-09-12 19:00 ` Stephane Eranian
2012-09-12 17:36 ` Oleg Nesterov
2012-09-12 17:41 ` Peter Zijlstra
2012-09-13 10:23 ` Peter Zijlstra
2012-09-13 11:49 ` Stephane Eranian
2012-09-13 12:11 ` Peter Zijlstra
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