| 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
| ||
|
Date: Thu, 25 Aug 2016 11:50:14 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Waiman Long <Waiman.Long@....com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org,
Borislav Petkov <bp@...e.de>,
Andy Lutomirski <luto@...nel.org>,
Prarit Bhargava <prarit@...hat.com>,
Scott J Norton <scott.norton@....com>,
Douglas Hatch <doug.hatch@....com>,
Randy Wright <rwright@....com>
Subject: Re: [PATCH v6] x86/hpet: Reduce HPET counter read contention
On 08/12/2016 05:59 PM, Waiman Long wrote:
> + * The lock and the hpet value are stored together and can be read in a
> + * single atomic 64-bit read. It is explicitly assumed that arch_spinlock_t
> + * is 32 bits in size.
This requirement forces us to give up all of the goodness of lockdep.
Is this strictly a performance optimization or is there some function
requirement behind it as well?
Powered by blists - more mailing lists