On Tue, Jan 25, 2011 at 06:31:11PM +0100, Peter Zijlstra wrote: > > 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 is build and boot-tested on x86_64 (a previous version was > also tested on Dave's Niagra2 machines, and I suppose s390 was too when > Martin provided the conversion patch for his arch). > > There are no known architectures left unconverted. Hi Peter. Foregive me my ignorance.. Why is this relevant for sparc64 but not for sparc32? A quick grep showed up only this in sparc32 specific files: mm/init_32.c:DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); Maybe this is just something sparc32 does not support? Sam -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>