Messages in this thread | | | Subject | Re: [PATCH 08 of 11] anon-vma-rwsem | From | Benjamin Herrenschmidt <> | Date | Thu, 08 May 2008 09:28:38 +1000 |
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On Thu, 2008-05-08 at 00:44 +0200, Andrea Arcangeli wrote: > > Please note, we can't allow a thread to be in the middle of > zap_page_range while mmu_notifier_register runs.
You said yourself that mmu_notifier_register can be as slow as you want ... what about you use stop_machine for it ? I'm not even joking here :-)
> vmtruncate takes 1 single lock, the i_mmap_lock of the inode. Not more > than one lock and we've to still take the global-system-wide lock > _before_ this single i_mmap_lock and no other lock at all.
Ben.
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