From: Peter Zijlstra <peterz@infradead.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: kan.liang@intel.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH V2 2/3] perf protect LBR when Intel PT is enabled.
Date: Thu, 3 Jul 2014 19:07:11 +0200 [thread overview]
Message-ID: <20140703170711.GW19379@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20140703155237.GQ5714@two.firstfloor.org>
[-- Attachment #1: Type: text/plain, Size: 315 bytes --]
On Thu, Jul 03, 2014 at 05:52:37PM +0200, Andi Kleen wrote:
> > If there's active LBR users out there, we should refuse to enable PT and
> > vice versa.
>
> This doesn't work, e.g. hardware debuggers can take over at any time.
Tough cookies. Hardware debuggers get to deal with whatever crap they
cause.
[-- Attachment #2: Type: application/pgp-signature, Size: 836 bytes --]
next prev parent reply other threads:[~2014-07-03 17:07 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-02 18:14 [PATCH V2 1/3] perf ignore LBR and offcore_rsp kan.liang
2014-07-02 18:14 ` [PATCH V2 2/3] perf protect LBR when Intel PT is enabled kan.liang
2014-07-03 2:44 ` Andi Kleen
2014-07-03 7:33 ` Peter Zijlstra
2014-07-03 15:52 ` Andi Kleen
2014-07-03 17:07 ` Peter Zijlstra [this message]
2014-07-07 13:57 ` Liang, Kan
2014-07-07 15:46 ` Peter Zijlstra
2014-07-07 15:47 ` Peter Zijlstra
2014-07-02 18:14 ` [PATCH V2 3/3] kvm: ignore LBR and offcore rsp kan.liang
2014-07-03 2:16 ` [PATCH V2 1/3] perf ignore LBR and offcore_rsp Andi Kleen
2014-07-03 4:26 ` Liang, Kan
2014-07-03 2:29 ` Jidong Xiao
2014-07-03 4:26 ` Liang, Kan
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20140703170711.GW19379@twins.programming.kicks-ass.net \
--to=peterz@infradead.org \
--cc=andi@firstfloor.org \
--cc=kan.liang@intel.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox