linux-kernel - Re: [PATCH 16/21] cpuidle: avoid unnecessary kzalloc/free of struct cpuidle_device

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Message-ID: <5243F08B.4090907@linaro.org>
Date:	Thu, 26 Sep 2013 10:30:03 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Patch Tracking <patches@...aro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 16/21] cpuidle: avoid unnecessary kzalloc/free of struct
 cpuidle_device_kobj

On 09/26/2013 08:05 AM, Viresh Kumar wrote:
> On 26 September 2013 03:42, Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
>> On 09/22/2013 03:21 AM, Viresh Kumar wrote:
>>> We always need to allocate struct cpuidle_device_kobj for all CPUs and so there
>>> is no real need to have a pointer to it inside struct cpuidle_device.
>>>
>>> This patch makes a object instance of struct cpuidle_device_kobj inside struct
>>> cpuidle_device instead of a pointer.
>>>
>>> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
>>
>> nack, it was made in purpose for kobject_init_and_add.
>>
>> see commit 728ce22b696f9f1404a74d7b2279a65933553a1b
>
> Ahh.. sorry for missing that one :(
>
> Now that I understand why it was introduced, I am thinking if
> we can make hotplug path a bit fast? By not freeing sysfs stuff
> and only hiding it for time being? And so we wouldn't be required
> to do unnecessary initialisations while coming back?
>
> Would that be worth it?

Yes if it possible.


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