From: Dave Hansen <dave.hansen@intel.com>
To: Waiman Long <Waiman.Long@hpe.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
Borislav Petkov <bp@suse.de>, Andy Lutomirski <luto@kernel.org>,
Prarit Bhargava <prarit@redhat.com>,
Scott J Norton <scott.norton@hpe.com>,
Douglas Hatch <doug.hatch@hpe.com>,
Randy Wright <rwright@hpe.com>
Subject: Re: [PATCH v6] x86/hpet: Reduce HPET counter read contention
Date: Thu, 25 Aug 2016 11:50:14 -0700 [thread overview]
Message-ID: <57BF3DE6.1090005@intel.com> (raw)
In-Reply-To: <1471049968-63172-1-git-send-email-Waiman.Long@hpe.com>
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?
next prev parent reply other threads:[~2016-08-25 18:50 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-13 0:59 Waiman Long
2016-08-13 2:30 ` kbuild test robot
2016-08-16 1:52 ` Waiman Long
2016-08-25 18:50 ` Dave Hansen [this message]
2016-08-25 20:07 ` Waiman Long
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