From: Arjan van de Ven <arjan@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>,
lenb@kernel.org, rjw@rjwysocki.net, linux-acpi@vger.kernel.org,
linux-kernel@vger.kernel.org, shaohua.li@intel.com,
rui.zhang@intel.com, Mike Galbraith <bitbucket@online.de>,
Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
hpa@zytor.com
Subject: Re: [PATCH] x86, acpi, idle: Restructure the mwait idle routines
Date: Wed, 20 Nov 2013 08:38:52 -0800 [thread overview]
Message-ID: <528CE59C.1040600@linux.intel.com> (raw)
In-Reply-To: <20131120163313.GR10022@twins.programming.kicks-ass.net>
On 11/20/2013 8:33 AM, Peter Zijlstra wrote:
> On Wed, Nov 20, 2013 at 08:24:47AM -0800, Arjan van de Ven wrote:
>> On 11/20/2013 2:58 AM, Peter Zijlstra wrote:
>>> So pretty silly actually; you cannot do a store (any store) in between
>>> monitor and mwait.
>>
>> you can
>> just not to the cacheline you are watching (or things that alias with that)
>
> Ah indeed, the thread_info::status is in the same cacheline.
>
you told it to wake on any write to that cacheline
and then you write to it ;-)
next prev parent reply other threads:[~2013-11-20 16:38 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-19 9:00 acpi_pad mwait usage Peter Zijlstra
2013-11-19 9:08 ` Peter Zijlstra
2013-11-19 11:31 ` [PATCH] x86, acpi, idle: Restructure the mwait idle routines Peter Zijlstra
2013-11-19 13:06 ` Rafael J. Wysocki
2013-11-19 13:21 ` Mike Galbraith
2013-11-19 14:22 ` Arjan van de Ven
2013-11-19 14:46 ` Peter Zijlstra
2013-11-19 14:51 ` Peter Zijlstra
2013-11-19 15:13 ` Peter Zijlstra
2013-11-19 21:06 ` Jacob Pan
2013-11-20 10:28 ` Peter Zijlstra
2013-11-20 10:58 ` Peter Zijlstra
2013-11-20 16:24 ` Arjan van de Ven
2013-11-20 16:33 ` Peter Zijlstra
2013-11-20 16:38 ` Arjan van de Ven [this message]
2014-01-12 18:44 ` [tip:sched/idle] sched/preempt, locking: Rework local_bh_{dis, en}able() tip-bot for Peter Zijlstra
2014-01-12 18:44 ` [tip:sched/idle] sched, net: Clean up preempt_enable_no_resched() abuse tip-bot for Peter Zijlstra
2014-01-12 18:44 ` [tip:sched/idle] sched, net: Fixup busy_loop_us_clock() tip-bot for Peter Zijlstra
2014-01-13 15:56 ` [tip:sched/core] locking: Optimize lock_bh functions tip-bot for Peter Zijlstra
2014-01-13 16:42 ` [tip:sched/core] sched/preempt, locking: Rework local_bh_{dis, en}able() tip-bot for Peter Zijlstra
2014-01-13 16:45 ` [tip:sched/core] sched, net: Clean up preempt_enable_no_resched() abuse tip-bot for Peter Zijlstra
2014-01-13 16:45 ` [tip:sched/core] sched, net: Fixup busy_loop_us_clock() tip-bot for Peter Zijlstra
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