|From:||Peter Zijlstra <firstname.lastname@example.org>|
|To:||Andrea Arcangeli <email@example.com>, Avi Kivity <firstname.lastname@example.org>, Thomas Gleixner <email@example.com>, Rik van Riel <firstname.lastname@example.org>, Ingo Molnar <email@example.com>, firstname.lastname@example.org, Linus Torvalds <email@example.com>|
|Subject:||[PATCH 00/13] mm: preemptibility -v2|
|Date:||Thu, 08 Apr 2010 21:17:37 +0200|
|Cc:||firstname.lastname@example.org, email@example.com, Benjamin Herrenschmidt <firstname.lastname@example.org>, David Miller <email@example.com>, Hugh Dickins <firstname.lastname@example.org>, Mel Gorman <email@example.com>, Nick Piggin <firstname.lastname@example.org>, Peter Zijlstra <email@example.com>|
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-kernel" in the body of a message to firstname.lastname@example.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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