From: "Li, Aubrey" <aubrey.li@linux.intel.com>
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Alan Cox <alan@linux.intel.com>,
LKML <linux-kernel@vger.kernel.org>,
Linux PM list <linux-pm@vger.kernel.org>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
Kristen Carlson Accardi <kristen@linux.intel.com>,
John Stultz <john.stultz@linaro.org>,
Len Brown <len.brown@intel.com>
Subject: Re: [PATCH 5/6] intel_idle: Add ->enter_freeze callbacks
Date: Thu, 05 Mar 2015 08:09:10 +0800 [thread overview]
Message-ID: <54F79EA6.2030605@linux.intel.com> (raw)
In-Reply-To: <2502414.MyBzvuWGMR@vostro.rjw.lan>
On 2015/3/5 8:18, Rafael J. Wysocki wrote:
> On Thursday, March 05, 2015 07:50:26 AM Li, Aubrey wrote:
>> On 2015/2/13 0:24, Rafael J. Wysocki wrote:
>>> On Thursday, February 12, 2015 02:26:43 PM Peter Zijlstra wrote:
>>>>
>>>> Why bother with enter_freeze() for any but the deepest state (C6 in this
>>>> case)?
>>>
>>> User space may disable the deepest one (and any of them in general) via sysfs
>>> and there's no good reason to ignore its choice in this particular case while
>>> we're honoring it otherwise.
>>>
>>> So the logic is basically "find the deepest one which isn't disabled" and
>>> setting the pointers costs us nothing really.
>>>
>>
>> If the user has chance to disable C6 via /sys, that means c6 works?
>> Shouldn't we ignore user space setting during freeze? Otherwise, we will
>> lost S0ix?
>
> We can't ignore it, because we don't know the reason why the state was
> disabled.
>
> It may just not work reliably enough on the given platform.
>
okay, make sense to me. Thanks, -Aubrey
next prev parent reply other threads:[~2015-03-05 0:09 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-11 4:00 [PATCH 0/6] PM / sleep: Support for quiescing timers during suspend-to-idle Rafael J. Wysocki
2015-02-11 4:01 ` [PATCH 1/6] PM / sleep: Re-implement suspend-to-idle handling Rafael J. Wysocki
2015-02-12 13:14 ` Peter Zijlstra
2015-02-12 16:18 ` Rafael J. Wysocki
2015-02-12 22:33 ` [Update][PATCH 1/6 v2] " Rafael J. Wysocki
2015-02-11 4:01 ` [PATCH 2/6] timekeeping: Pass readout base to update_fast_timekeeper() Rafael J. Wysocki
2015-02-13 0:29 ` John Stultz
2015-02-11 4:03 ` [PATCH 3/6] timekeeping: Make it safe to use the fast timekeeper while suspended Rafael J. Wysocki
2015-02-13 0:53 ` John Stultz
2015-02-13 2:03 ` Rafael J. Wysocki
2015-02-13 2:59 ` Travis
2015-02-13 9:03 ` John Stultz
2015-02-13 14:32 ` Rafael J. Wysocki
2015-02-14 17:30 ` John Stultz
2015-02-11 4:03 ` [PATCH 4/6] PM / sleep: Make it possible to quiesce timers during suspend-to-idle Rafael J. Wysocki
2015-02-12 13:24 ` Peter Zijlstra
2015-02-12 16:19 ` Rafael J. Wysocki
2015-02-12 22:36 ` [Update][PATCH 4/6 v2] " Rafael J. Wysocki
2015-02-11 4:04 ` [PATCH 5/6] intel_idle: Add ->enter_freeze callbacks Rafael J. Wysocki
2015-02-12 13:26 ` Peter Zijlstra
2015-02-12 16:24 ` Rafael J. Wysocki
2015-02-12 16:25 ` Peter Zijlstra
2015-03-04 23:50 ` Li, Aubrey
2015-03-05 0:18 ` Rafael J. Wysocki
2015-03-05 0:09 ` Li, Aubrey [this message]
2015-02-11 4:04 ` [PATCH 6/6] ACPI / idle: Implement ->enter_freeze callback routine Rafael J. Wysocki
2015-02-13 8:13 ` [PATCH 0/6] PM / sleep: Support for quiescing timers during suspend-to-idle Peter Zijlstra
2015-02-13 14:29 ` Rafael J. Wysocki
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