Hi, This (still incomplete) patch-set makes part of the mm a lot more preemptible. It converts i_mmap_lock and anon_vma->lock to mutexes. On the way there it also makes mmu_gather 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 we 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 be wanted by KSM as well as Mel's compaction work. This patch-set seems to build and boot on my x86_64 machines and even builds a kernel. I've also attempted powerpc and sparc, which I've compile tested with their respective defconfigs, remaining are (afaikt the rest uses the generic tlb bits): - s390 - ia64 - arm - superh - um >From those, s390 and ia64 look 'interesting', arm and superh seem very similar and should be relatively easy (-rt has a patchlet for arm iirc). What kind of performance tests would people have me run on this to satisfy their need for numbers? I've done a kernel build on x86_64 and if anything that was slightly faster with these patches, but it was well within the noise levels so it might be heat noise I'm looking at ;-) -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
