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From: Peter Zijlstra on 7 Jun 2010 07:30
This patch-set makes part of the mm a lot more preemptible. It converts
i_mmap_lock and anon_vma->lock to mutexes and makes mmu_gather fully
preemptible.

The main motivation was making mm_take_all_locks() preemptible, since it
appears people are nesting hundreds of spinlocks there.

The side-effects are that can finally make mmu_gather preemptible,
something which lots of people have wanted to do for a long time.

It also gets us anon_vma refcounting, which seems to result in a nice
cleanup of the anon_vma lifetime rules wrt KSM and compaction.

This patch-set it build and boot-tested on x86_64 (a previous version was
also tested on Dave's Niagra2 machines, and I suppose s390 did too when
Martin provided the conversion patch for his arch).

There are no known architectures left unconverted, although some arch code
never did see a compiler (superh and um come to mind).

Can we move this work forwards, or is there anything people would want to
see done?

[ The series includes Rik's latest patches to the same area for
convenience ]


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