Re: [RFC PATCH 4/5] Remove CPU_DEAD/CPU_UP_CANCELLED handling from workqueue.c

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To: Gautham R Shenoy <ego@...>

Cc: Linus Torvalds <torvalds@...>, Andrew Morton <akpm@...>, <linux-kernel@...>, Rusty Russel <rusty@...>, Srivatsa Vaddagiri <vatsa@...>, Dipankar Sarma <dipankar@...>, Ingo Molnar <mingo@...>

Subject: Re: [RFC PATCH 4/5] Remove CPU_DEAD/CPU_UP_CANCELLED handling from workqueue.c

Date: Wednesday, October 24, 2007 - 2:14 pm

On 10/24, Gautham R Shenoy wrote:
quoted text>
> On Wed, Oct 24, 2007 at 05:38:18PM +0400, Oleg Nesterov wrote:
> > 
> > So, can't we introduce 2 nested rw locks? The first one blocks cpu hotplug
> > (like get_online_cpus does currently), the second one just pins cpu maps.
> > I think most users needs only this, not more.
> > 
> 
> Well, rw locks/sems cannot recurse. However, refcount model supports
> recursion naturally. Hence the implementation.

No, no, you misunderstood! (I was unclear). I meant, can't we introduce 2
refcounted nested locks? Both implemented as get_online_cpus/cpu_hotplug_begin.

Oleg.

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Messages in current thread:

[RFC PATCH 0/5] Refcount based Cpu Hotplug. V2, Gautham R Shenoy, (Wed Oct 24, 1:29 am)

Re: [RFC PATCH 0/5] Refcount based Cpu Hotplug. V2, Christoph Lameter, (Wed Oct 24, 1:04 pm)

Re: [RFC PATCH 0/5] Refcount based Cpu Hotplug. V2, Gautham R Shenoy, (Wed Oct 24, 2:00 pm)

Re: [RFC PATCH 0/5] Refcount based Cpu Hotplug. V2, Oleg Nesterov, (Wed Oct 24, 2:17 pm)

Re: [RFC PATCH 0/5] Refcount based Cpu Hotplug. V2, Gautham R Shenoy, (Wed Oct 24, 2:22 pm)

[RFC PATCH 5/5] Update get_online_cpus() in Documentation/cp..., Gautham R Shenoy, (Wed Oct 24, 1:39 am)

[RFC PATCH 4/5] Remove CPU_DEAD/CPU_UP_CANCELLED handling fr..., Gautham R Shenoy, (Wed Oct 24, 1:37 am)

Re: [RFC PATCH 4/5] Remove CPU_DEAD/CPU_UP_CANCELLED handlin..., Rusty Russell, (Wed Oct 24, 3:21 am)

Re: [RFC PATCH 4/5] Remove CPU_DEAD/CPU_UP_CANCELLED handlin..., Oleg Nesterov, (Wed Oct 24, 9:44 am)

Re: [RFC PATCH 4/5] Remove CPU_DEAD/CPU_UP_CANCELLED handlin..., Gautham R Shenoy, (Wed Oct 24, 4:35 am)

Re: [RFC PATCH 4/5] Remove CPU_DEAD/CPU_UP_CANCELLED handlin..., Oleg Nesterov, (Wed Oct 24, 9:38 am)

Re: [RFC PATCH 4/5] Remove CPU_DEAD/CPU_UP_CANCELLED handlin..., Gautham R Shenoy, (Wed Oct 24, 1:45 pm)

Re: [RFC PATCH 4/5] Remove CPU_DEAD/CPU_UP_CANCELLED handlin..., Oleg Nesterov, (Wed Oct 24, 2:14 pm)

[RFC PATCH 3/5] Replace per-subsystem mutexes with get_onlin..., Gautham R Shenoy, (Wed Oct 24, 1:34 am)

[RFC PATCH 2/5] Replace lock_cpu_hotplug() with get_online_c..., Gautham R Shenoy, (Wed Oct 24, 1:32 am)

[RFC PATCH 1/5] Refcount Based Cpu Hotplug implementation, Gautham R Shenoy, (Wed Oct 24, 1:30 am)


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Re: [RFC PATCH 4/5] Remove CPU_DEAD/CPU_UP_CANCELLED handling from workqueue.c

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