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-next>] [day] [month] [year] [list]
Message-Id: <1432786398-23861-1-git-send-email-andi@firstfloor.org>
Date:	Wed, 27 May 2015 21:13:13 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	peterz@...radead.org
Cc:	acme@...nel.org, linux-kernel@...r.kernel.org, jolsa@...hat.com,
	eranian@...gle.com
Subject: 

[Repost; I forgot to copy linux-kernel earlier. Apologies if you
see it twice.]

Skylake moved to 32 Last Branch Records, from previously 16. 
The current call stack LBR implementation reads all LBRs and
also saves/restores them on context switch. This patchkit
adds some optimizations to avoid extra costs in most cases
from the larger number of LBRs for call-stack, unless a nesting
larger than 16 is actually needed. It applies on top of the
earlier Skylake code. Some of the optimization will also benefit
earlier CPUs, such as Haswell.

note: one patch is for perf user space, the rest is kernel.

-Andi

--
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/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ