Hi, On Tuesday 12 March 2013 08:38:24 Minchan Kim wrote: > First of all, let's define the term. > From now on, I'd like to call it as vrange(a.k.a volatile range) > for anonymous page. If you have a better name in mind, please suggest. > > This version is still *RFC* because it's just quick prototype so > it doesn't support THP/HugeTLB/KSM and even couldn't build on !x86. > Before further sorting out issues, I'd like to post current direction > and discuss it. Of course, I'd like to extend this discussion in > comming LSF/MM. > > In this version, I changed lots of thing, expecially removed vma-based > approach because it needs write-side lock for mmap_sem, which will drop > performance in mutli-threaded big SMP system, KOSAKI pointed out. > And vma-based approach is hard to meet requirement of new system call by > John Stultz's suggested semantic for consistent purged handling. > (http://linux-kernel.2935.n7.nabble.com/RFC-v5-0-8-Support-volatile-for-anonymous-range-tt575773.html#none) > > I tested this patchset with modified jemalloc allocator which was > leaded by Jason Evans(jemalloc author) who was interest in this feature > and was happy to port his allocator to use new system call. > Super Thanks Jason! > > The benchmark for test is ebizzy. It have been used for testing the > allocator performance so it's good for me. Again, thanks for recommending > the benchmark, Jason. > (http://people.freebsd.org/~kris/scaling/ebizzy.html) > > The result is good on my machine (12 CPU, 1.2GHz, DRAM 2G) > > ebizzy -S 20 > > jemalloc-vanilla: 52389 records/sec > jemalloc-vrange: 203414 records/sec > > ebizzy -S 20 with background memory pressure > > jemalloc-vanilla: 40746 records/sec > jemalloc-vrange: 174910 records/sec Could you please make the modified jemalloc/ebizzy available somewhere so there is a easy way to test your patchset? Best regards, -- Bartlomiej Zolnierkiewicz Samsung Poland R&D Center -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>