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Re: [PATCH v3 2/2] decrement static keys on real destroy time [message #46135 is a reply to message #46134]

Thu, 26 April 2012 22:22

Tejun Heo
Messages: 184
Registered: November 2006

Senior Member

Hello,

On Thu, Apr 26, 2012 at 3:17 PM, Glauber Costa <glommer@parallels.com> wrote:
>
>> No, what I mean is that why can't you do about the same mutexed
>> activated inside static_key API function instead of requiring every
>> user to worry about the function returning asynchronously.
>> ie. synchronize inside static_key API instead of in the callers.
>>
>
> Like this?

Yeah, something like that. If keeping the inc operation a single
atomic op is important for performance or whatever reasons, you can
play some trick with large negative bias value while activation is
going on and use atomic_add_return() to determine both whether it's
the first incrementer and someone else is in the process of
activating.

Thanks.

--
tejun

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[Message index]

		[PATCH v3 2/2] decrement static keys on real destroy time By: Glauber Costa on Thu, 26 April 2012 21:24
		Re: [PATCH v3 2/2] decrement static keys on real destroy time By: Tejun Heo on Thu, 26 April 2012 21:39
		Re: [PATCH v3 2/2] decrement static keys on real destroy time By: Glauber Costa on Thu, 26 April 2012 21:58
		Re: [PATCH v3 2/2] decrement static keys on real destroy time By: Tejun Heo on Thu, 26 April 2012 22:13
		Re: [PATCH v3 2/2] decrement static keys on real destroy time By: Glauber Costa on Thu, 26 April 2012 22:17
		Re: [PATCH v3 2/2] decrement static keys on real destroy time By: Tejun Heo on Thu, 26 April 2012 22:22
		Re: [PATCH v3 2/2] decrement static keys on real destroy time By: Glauber Costa on Thu, 26 April 2012 22:28
		Re: [PATCH v3 2/2] decrement static keys on real destroy time By: Tejun Heo on Thu, 26 April 2012 22:32

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