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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: mingo@kernel.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
Subject: Re: [tip:perf/core] perf/x86: Fix USER/KERNEL tagging of samples
Date: Fri, 6 Jul 2012 11:16:57 -0700
Message-ID: <CA+55aFzqoz7dcUCQfSrXxX2T8=2wgWdb1H2vaBhk7V-r0uaogw@mail.gmail.com> (raw)
In-Reply-To: <1341598329.7709.57.camel@twins>

On Fri, Jul 6, 2012 at 11:12 AM, Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:
>
> PEBS, BTS, LBR don't have CS. PEBS does have eflags.
>
> If we cannot do this I'm not sure what we can do :/

Well, you're passed in a "pt_regs". Which *does* have CS, and has it right.

If some code then changes the values in the pt_regs, it is *that* code
that needs to think twice about what it does. Where is that code?

                 Linus

  reply index

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-06  6:20 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 [this message]
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
2012-07-10  9:48                   ` Ingo Molnar
2012-07-31 18:11                     ` H. Peter Anvin

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