From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
hpa@zytor.com, eranian@google.com, linux-kernel@vger.kernel.org,
fweisbec@gmail.com, akpm@linux-foundation.org,
tglx@linutronix.de, linux-tip-commits@vger.kernel.org,
Robert Richter <robert.richter@amd.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: [tip:perf/core] perf/x86: Fix USER/KERNEL tagging of samples
Date: Tue, 10 Jul 2012 10:52:40 +0200 [thread overview]
Message-ID: <1341910360.3462.99.camel@twins> (raw)
In-Reply-To: <20120710082104.GA11187@gmail.com>
On Tue, 2012-07-10 at 10:21 +0200, Ingo Molnar wrote:
> Another boundary condition would be when we intentionally
> twiddle the GDT: such as during suspend or during BIOS upcalls.
> Can we then get a PMU interrupt? If yes then this will probably
> result in garbage:
>
> > > > + desc = __this_cpu_ptr(&gdt_page.gdt[0]);
>
> it won't outright crash, we don't ever deallocate our GDT - but
> it will return a garbage RIP.
Nothing we can do about that though..
> Then there's also all the Xen craziness with segments ...
I don't think Xen Dom0 has PMU access, that would be their Hyper-visor
thingy's job, no?
Anyway, that seems a problem for Jeremy and Konrad..
next prev parent reply other threads:[~2012-07-10 8:53 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-06 6:20 [tip:perf/core] perf/x86: Fix USER/KERNEL tagging of samples tip-bot for Peter Zijlstra
2012-07-06 16:29 ` Linus Torvalds
2012-07-06 18:12 ` Peter Zijlstra
2012-07-06 18:16 ` Linus Torvalds
2012-07-06 18:34 ` Linus Torvalds
2012-07-06 20:48 ` Peter Zijlstra
2012-07-06 20:59 ` Linus Torvalds
2012-07-09 11:23 ` Peter Zijlstra
2012-07-09 17:55 ` Linus Torvalds
2012-07-10 9:02 ` Peter Zijlstra
2012-07-10 9:48 ` Ingo Molnar
2012-07-10 9:50 ` Peter Zijlstra
2012-07-10 9:52 ` Peter Zijlstra
2012-07-10 9:55 ` Ingo Molnar
2012-07-31 17:57 ` [tip:perf/urgent] perf/x86: Fix USER/ KERNEL tagging of samples properly tip-bot for Peter Zijlstra
2012-07-09 18:41 ` [tip:perf/core] perf/x86: Fix USER/KERNEL tagging of samples Ingo Molnar
2012-07-10 7:54 ` Peter Zijlstra
2012-07-10 8:02 ` Ingo Molnar
2012-07-10 8:21 ` Ingo Molnar
2012-07-10 8:52 ` Peter Zijlstra [this message]
2012-07-10 9:48 ` Ingo Molnar
2012-07-31 18:11 ` H. Peter Anvin
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