linux-kernel - Re: [PATCH 0/2] cpuidle optimizations (on top of linux-next)

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Message-ID: <CAJZ5v0hgKfpi2PDbzk5Rvnio1vC3onaWkJ-2ccg5KAd=r3qPBA@mail.gmail.com>
Date:	Tue, 19 Jan 2016 14:14:59 +0100
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Sudeep Holla <sudeep.holla@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH 0/2] cpuidle optimizations (on top of linux-next)

On Tue, Jan 19, 2016 at 8:28 AM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Sudeep Holla <sudeep.holla@....com> wrote:
>
>> On 15/01/16 23:53, Rafael J. Wysocki wrote:
>> >Hi,
>> >
>> >When I was looking at the cpuidle code after the Sudeeps's problem report,
>> >it occured to me that we had some pointless overhead there, so two
>> >changes to reduce it follow.
>> >
>> >[1/2] Make the fallback to to default_idle_call() in call_cpuidle()
>> >       unnecessary and drop it.
>> >[2/2] Make menu_select() avoid checking states that don't need to
>> >       (or even shouldn't) be checked when making the selection.
>> >
>>
>> Tested-by: Sudeep Holla <sudeep.holla@....com>
>
> Rafael, can I pick these up into the scheduler tree?

They won't apply at this point as one commit they depend on is in my
linux-next branch waiting for the next push.

Would it be a problem if they went in through the PM tree instead?

Thanks,
Rafael