From: Ingo Molnar <mingo@elte.hu>
To: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Stephane Eranian <eranian@google.com>,
Andi Kleen <andi@firstfloor.org>,
linux-kernel@vger.kernel.org, acme@redhat.com,
ming.m.lin@intel.com, robert.richter@amd.com, ravitillo@lbl.gov
Subject: Re: [PATCH 07/12] perf_events: add LBR software filter support for Intel X86
Date: Mon, 10 Oct 2011 08:09:27 +0200 [thread overview]
Message-ID: <20111010060927.GG32173@elte.hu> (raw)
In-Reply-To: <4E8EE885.9040703@hitachi.com>
* Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> wrote:
> (2011/10/07 20:21), Peter Zijlstra wrote:
> > On Fri, 2011-10-07 at 13:18 +0200, Peter Zijlstra wrote:
> >>> Yeah, depending on the depth of the LBR. But then what happens, you
> >>> decode an instruction that is not what was executed.
> >>
> >> Right, and Andi's concern is that this might cause our instruction
> >> decoder to blow up, or worse.
> >
> > That is, we have a fair confidence that its capable of correctly
> > decoding correct streams, but I understood from Masami that they haven't
> > actually tried feeding it crap.
>
> OK, I'll do hardening it.
Yes, that's a good idea. Could you perhaps add it to the existing
build time sanity test we do for the instruction decoder, to feed it
a sequence of /dev/urandom input or such?
Thanks,
Ingo
next prev parent reply other threads:[~2011-10-10 6:11 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-06 14:49 [PATCH 00/12] perf_events: add support for sampling taken branches Stephane Eranian
2011-10-06 14:49 ` [PATCH 01/12] perf_events: add generic taken branch sampling support Stephane Eranian
2011-10-06 16:57 ` Peter Zijlstra
2011-10-07 10:28 ` Stephane Eranian
2011-10-07 10:32 ` Peter Zijlstra
2011-10-07 10:44 ` Stephane Eranian
2011-10-06 17:01 ` Peter Zijlstra
2011-10-06 14:49 ` [PATCH 02/12] perf_events: add Intel LBR MSR definitions Stephane Eranian
2011-10-06 14:49 ` [PATCH 03/12] perf_events: add Intel X86 LBR sharing logic Stephane Eranian
2011-10-06 14:49 ` [PATCH 04/12] perf_events: sync branch stack sampling with X86 precise_sampling Stephane Eranian
2011-10-06 17:25 ` Peter Zijlstra
2011-10-07 10:34 ` Stephane Eranian
2011-10-07 10:37 ` Peter Zijlstra
2011-10-06 14:49 ` [PATCH 05/12] perf_events: add LBR mappings for PERF_SAMPLE_BRANCH filters Stephane Eranian
2011-10-06 14:49 ` [PATCH 06/12] perf_events: implement PERF_SAMPLE_BRANCH for Intel X86 Stephane Eranian
2011-10-06 17:54 ` Peter Zijlstra
2011-10-06 18:05 ` Peter Zijlstra
2011-10-06 14:49 ` [PATCH 07/12] perf_events: add LBR software filter support " Stephane Eranian
2011-10-06 15:32 ` Andi Kleen
2011-10-06 16:43 ` Peter Zijlstra
2011-10-06 17:14 ` Andi Kleen
2011-10-10 6:08 ` Ingo Molnar
2011-10-10 9:39 ` Peter Zijlstra
2011-10-07 7:06 ` Masami Hiramatsu
2011-10-07 10:38 ` Stephane Eranian
2011-10-07 10:40 ` Stephane Eranian
2011-10-07 10:42 ` Peter Zijlstra
2011-10-07 10:49 ` Stephane Eranian
2011-10-07 11:18 ` Peter Zijlstra
2011-10-07 11:21 ` Peter Zijlstra
2011-10-07 11:54 ` Masami Hiramatsu
2011-10-07 13:31 ` [PATCH] x86: Fix insn decoder for longer instruction Masami Hiramatsu
2011-10-10 7:04 ` Ingo Molnar
2011-10-10 6:09 ` Ingo Molnar [this message]
2011-10-10 14:05 ` [PATCH 07/12] perf_events: add LBR software filter support for Intel X86 Masami Hiramatsu
2011-10-10 14:45 ` Andi Kleen
2011-10-11 12:59 ` Masami Hiramatsu
2011-10-12 7:06 ` Ingo Molnar
2011-10-13 10:54 ` Masami Hiramatsu
2011-10-13 11:01 ` [RFC PATCH] x86: Add a sanity test of x86 decoder Masami Hiramatsu
2011-10-18 6:54 ` Ingo Molnar
2011-10-19 4:29 ` Masami Hiramatsu
2011-10-19 6:44 ` Ingo Molnar
2011-10-20 14:01 ` [RFC PATCH v2 1/2] " Masami Hiramatsu
2011-11-18 23:16 ` [tip:perf/core] x86, perf: Add a build-time sanity test to the " tip-bot for Masami Hiramatsu
2011-10-20 14:01 ` [RFC PATCH v2 2/2] [RESEND] x86: Fix insn decoder for longer instruction Masami Hiramatsu
2011-10-07 15:42 ` [PATCH 07/12] perf_events: add LBR software filter support for Intel X86 Andi Kleen
2011-10-07 11:25 ` Masami Hiramatsu
2011-10-07 11:40 ` Peter Zijlstra
2011-10-07 15:44 ` Andi Kleen
2011-10-07 15:09 ` Andi Kleen
2011-10-07 16:05 ` Peter Zijlstra
2011-10-06 14:49 ` [PATCH 08/12] perf_events: disable PERF_SAMPLE_BRANCH_* when not supported Stephane Eranian
2011-10-06 18:53 ` Peter Zijlstra
2011-10-06 14:49 ` [PATCH 09/12] perf_events: add hook to flush branch_stack on context switch Stephane Eranian
2011-10-06 14:49 ` [PATCH 10/12] perf: add code to support PERF_SAMPLE_BRANCH_STACK Stephane Eranian
2011-10-06 18:50 ` Peter Zijlstra
2011-10-07 10:25 ` Stephane Eranian
2011-10-07 10:27 ` Peter Zijlstra
2011-10-06 14:49 ` [PATCH 11/12] perf: add support for sampling taken branch to perf record Stephane Eranian
2011-10-06 14:49 ` [PATCH 12/12] perf: add support for taken branch sampling to perf report Stephane Eranian
2011-10-06 15:25 ` [PATCH 00/12] perf_events: add support for sampling taken branches Andi Kleen
2011-10-07 10:23 ` Stephane Eranian
2011-10-06 18:32 ` Peter Zijlstra
2011-10-06 21:41 ` Stephane Eranian
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=20111010060927.GG32173@elte.hu \
--to=mingo@elte.hu \
--cc=acme@redhat.com \
--cc=andi@firstfloor.org \
--cc=eranian@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=masami.hiramatsu.pt@hitachi.com \
--cc=ming.m.lin@intel.com \
--cc=peterz@infradead.org \
--cc=ravitillo@lbl.gov \
--cc=robert.richter@amd.com \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.