Messages in this thread | | | Date | Thu, 01 Apr 2010 18:51:17 +0300 | From | Avi Kivity <> | Subject | Re: [COUNTERPATCH] mm: avoid overflowing preempt_count() in mmu_take_all_locks() |
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On 04/01/2010 06:42 PM, Andrea Arcangeli wrote: > On Thu, Apr 01, 2010 at 01:43:14PM +0200, Peter Zijlstra wrote: > >> On Thu, 2010-04-01 at 13:27 +0200, Peter Zijlstra wrote: >> >>> I've almost got a patch done that converts those two, still need to look >>> where that tasklist_lock muck happens. >>> >> OK, so the below builds and boots, only need to track down that >> tasklist_lock nesting, but I got to run an errand first. >> > You should have a look at my old patchset where Christoph already > implemented this (and not for decreasing latency but to allow > scheduling in mmu notifier handlers, only needed by XPMEM): > > http://www.kernel.org/pub/linux/kernel/people/andrea/patches/v2.6/2.6.26-rc7/mmu-notifier-v18/ > > The ugliest part of it (that I think you missed below) is the breakage > of the RCU locking in the anon-vma which requires adding refcounting > to it. That was the worst part of the conversion as far as I can tell. > > http://www.kernel.org/pub/linux/kernel/people/andrea/patches/v2.6/2.6.26-rc7/mmu-notifier-v18/anon-vma >
Can we use srcu now instead?
-- error compiling committee.c: too many arguments to function
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