Re: [PATCH 1/7] x86-64: introduce fast variant of smp_call_function_single()

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From: Jens Axboe <jens.axboe@...>

To: Jeremy Fitzhardinge <jeremy@...>

Cc: <linux-kernel@...>, <npiggin@...>, <dgc@...>

Subject: Re: [PATCH 1/7] x86-64: introduce fast variant of smp_call_function_single()

Date: Monday, March 17, 2008 - 3:25 am

On Sun, Mar 16 2008, Jeremy Fitzhardinge wrote:
quoted text> Jens Axboe wrote:
> >On Fri, Mar 14 2008, Jeremy Fitzhardinge wrote:
> >  
> >>Jens Axboe wrote:
> >>    
> >>>rom: Nick Piggin <npiggin@suse.de>
> >>> 
> >>>      
> >>Why is this necessary?  How is smp_call_function_single slow?
> >>    
> >
> >Because it's completely serialized by the call_lock spinlock.
> >  
> 
> Hm, yes.  Would it be possible to implement smp_call_function_mask in a 
> generic way to avoid that?  Turn the static structure into a per-cpu 
> request list?

Have you looked at the patches you are replying to? :-)

-- 
Jens Axboe

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Messages in current thread:

[PATCH 0/7] IO CPU affinity testing series, Jens Axboe, (Wed Mar 12, 7:55 am)

Re: [PATCH 0/7] IO CPU affinity testing series, Alan D. Brunelle, (Thu Mar 13, 10:54 am)

Re: [PATCH 0/7] IO CPU affinity testing series, Jens Axboe, (Thu Mar 13, 11:00 am)

Re: [PATCH 0/7] IO CPU affinity testing series, Max Krasnyanskiy, (Wed Mar 12, 4:37 pm)

Re: [PATCH 0/7] IO CPU affinity testing series, Jens Axboe, (Thu Mar 13, 8:13 am)

Re: [PATCH 0/7] IO CPU affinity testing series, Alan D. Brunelle, (Wed Mar 12, 12:41 pm)

Re: [PATCH 0/7] IO CPU affinity testing series, Jens Axboe, (Wed Mar 12, 1:54 pm)

[PATCH 3/7] x86: add fast smp_call_function_single(), Jens Axboe, (Wed Mar 12, 7:55 am)

[PATCH 2/7] x86-64: speedup and tweak smp_call_function_sing..., Jens Axboe, (Wed Mar 12, 7:55 am)

[PATCH 7/7] block: add test code for testing CPU affinity, Jens Axboe, (Wed Mar 12, 7:55 am)

[PATCH 6/7] block: make kblockd_schedule_work() take the que..., Jens Axboe, (Wed Mar 12, 7:55 am)

[PATCH 5/7] Add interface for queuing work on a specific CPU, Jens Axboe, (Wed Mar 12, 7:55 am)

[PATCH 4/7] block: split softirq handling into blk-softirq.c, Jens Axboe, (Wed Mar 12, 7:55 am)

[PATCH 1/7] x86-64: introduce fast variant of smp_call_funct..., Jens Axboe, (Wed Mar 12, 7:55 am)

Re: [PATCH 1/7] x86-64: introduce fast variant of smp_call_f..., Jeremy Fitzhardinge, (Fri Mar 14, 2:21 pm)

Re: [PATCH 1/7] x86-64: introduce fast variant of smp_call_f..., Jens Axboe, (Sun Mar 16, 2:45 pm)

Re: [PATCH 1/7] x86-64: introduce fast variant of smp_call_f..., Jeremy Fitzhardinge, (Sun Mar 16, 6:58 pm)

Re: [PATCH 1/7] x86-64: introduce fast variant of smp_call_f..., Jens Axboe, (Mon Mar 17, 3:25 am)

Re: [PATCH 1/7] x86-64: introduce fast variant of smp_call_f..., Nick Piggin, (Sun Mar 16, 10:24 pm)

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