linux-kernel - Re: PEBS (in perf) stopped working from 3.6 -> 3.7

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 06 Jan 2013 20:48:36 -0700
From:	David Ahern <dsahern@...il.com>
To:	"Steinar H. Gunderson" <sgunderson@...foot.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: PEBS (in perf) stopped working from 3.6 -> 3.7

On 1/4/13 6:05 PM, Steinar H. Gunderson wrote:
> On Fri, Jan 04, 2013 at 05:16:27PM -0700, David Ahern wrote:
>> Known problem. Pick one of: update perf to 3.7, add H to the command
>> (-e cycles:ppH) or apply this patch:
>> https://lkml.org/lkml/2012/12/28/384
>
> I spoke too soon. This works for cycles, but not for branch-misses:
>
>    pannekake:~> sudo perf record -e branch-misses:ppH -a
>
>      Error: sys_perf_event_open() syscall returned with 95 (Operation not supported) for event branch-misses:ppH. /bin/dmesg may provide additional information.
>
>    No hardware sampling interrupt available. No APIC? If so then you can boot the kernel with the "lapic" boot parameter to force-enable it.
>
> Why would the two be different?

I will make a guess that is processor dependent. On an E5540 with 
3.4.11-1.fc16.x86_64, 3.6.10-2.fc16.x86_64, and 3.8 I get the same 
failure message.

But on a E5620, it works fine with 3.4 and 3.7 (no intermediate kernels 
on that box).

David
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/