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Date: Thu, 15 May 2008 14:12:34 +0300
From: Avi Kivity <avi@qumranet.com>
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To: Robin Holt <holt@sgi.com>
CC: Nick Piggin <npiggin@suse.de>, Nick Piggin <nickpiggin@yahoo.com.au>,
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Subject: Re: [PATCH 08 of 11] anon-vma-rwsem
References: <6b384bb988786aa78ef0.1210170958@duo.random> <alpine.LFD.1.10.0805071429170.3024@woody.linux-foundation.org> <20080508003838.GA9878@sgi.com> <200805132206.47655.nickpiggin@yahoo.com.au> <20080513153238.GL19717@sgi.com> <20080514041122.GE24516@wotan.suse.de> <20080514112625.GY9878@sgi.com> <20080515075747.GA7177@wotan.suse.de> <20080515110147.GD10126@sgi.com>
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Robin Holt wrote:
> Then we need to deposit the information needed to do the invalidate.
>
> Lastly, we would need to interrupt.  Unfortunately, here we have a
> thundering herd.  There could be up to 16256 processors interrupting the
> same processor.  That will be a lot of work.  It will need to look up the
> mm (without grabbing any sleeping locks in either xpmem or the kernel)
> and do the tlb invalidates.
>
>   

You don't need to interrupt every time.  Place your data in a queue (you 
do support rmw operations, right?) and interrupt.  Invalidates from 
other processors will see that the queue hasn't been processed yet and 
skip the interrupt.

-- 
error compiling committee.c: too many arguments to function