On Wed, 13 Oct 2010, Alex,Shi wrote: > I got the code from > git://git.kernel.org/pub/scm/linux/kernel/git/christoph/slab.git unified > on branch "origin/unified" and do a patch base on 36-rc7 kernel. Then I > tested the patch on our 2P/4P core2 machines and 2P NHM, 2P WSM > machines. Most of benchmark have no clear improvement or regression. The > testing benchmarks is listed here. > http://kernel-perf.sourceforge.net/about_tests.php Ah. Thanks. The tests needs to show a clear benefit for this to be a viable solution. They did earlier without all the NUMA queuing on SMP. > BTW, I save several time kernel panic in fio testing: > =================== > > Pid: 776, comm: kswapd0 Not tainted 2.6.36-rc7-unified #1 X8DTN/X8DTN > > > RIP: 0010:[<ffffffff810cc21c>] [<ffffffff810cc21c>] slab_alloc > > > +0x562/0x6f2 Cannot see the error message? I guess this is the result of a BUG_ON()? I'll try to run that fio test first. > kswapd0: page allocation failure. order:0, mode:0xd0 > Pid: 714, comm: kswapd0 Not tainted 2.6.36-rc7-unified #1 > Call Trace: > [<ffffffff8109fcf4>] ? __alloc_pages_nodemask+0x63f/0x6c7 > [<ffffffff8100328e>] ? apic_timer_interrupt+0xe/0x20 > [<ffffffff810cc6f7>] ? new_slab+0xac/0x277 > [<ffffffff810cce1e>] ? slab_alloc+0x55c/0x6e8 > [<ffffffff810ce58b>] ? shared_caches+0x31/0xd9 > [<ffffffff810ce110>] ? __kmalloc+0xb0/0xff > [<ffffffff810ce58b>] ? shared_caches+0x31/0xd9 > [<ffffffff810ce649>] ? expire_alien_caches+0x16/0x8d > [<ffffffff810cde25>] ? kmem_cache_expire_all+0xf6/0x14d Expiration needs to get the gfp flags from the reclaim context. And we now have more allocations in a reclaim context. > slab_unreclaimable:2963060kB kernel_stack:1016kB pagetables:656kB 3GB unreclaimable.... Memory leak. -- 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/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>