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mm: preemptibility -v3
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 ] -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |
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