I think we got a winner! Problem seems to be fixed. Just for record, I used next patches: 59c33fa7791e9948ba467c2b83e307a0d087ab49 5d0b7235d83eefdafda300656e97d368afcafc9a 1838ef1d782f7527e6defe87e180598622d2d071 4126faf0ab7417fbc6eb99fb0fd407e01e9e9dfe bafaecd11df15ad5b1e598adc7736afcd38ee13d 0d1622d7f526311d87d7da2ee7dd14b73e45d3fc Thanks, Anton. On Mar 23, 2010, at 8:54 PM, Linus Torvalds wrote: > > > On Tue, 23 Mar 2010, Anton Starikov wrote: > >> >> On Mar 23, 2010, at 6:45 PM, Linus Torvalds wrote: >> >>> >>> >>> On Tue, 23 Mar 2010, Ingo Molnar wrote: >>>> >>>> It shows a very brutal amount of page fault invoked mmap_sem spinning >>>> overhead. >>> >>> Isn't this already fixed? It's the same old "x86-64 rwsemaphores are using >>> the shit-for-brains generic version" thing, and it's fixed by >>> >>> 1838ef1 x86-64, rwsem: 64-bit xadd rwsem implementation >>> 5d0b723 x86: clean up rwsem type system >>> 59c33fa x86-32: clean up rwsem inline asm statements >>> >>> NOTE! None of those are in 2.6.33 - they were merged afterwards. But they >>> are in 2.6.34-rc1 (and obviously current -git). So Anton would have to >>> compile his own kernel to test his load. >> >> >> Applied mentioned patches. Things didn't improve too much. > > Yeah, I missed at least one commit, namely > > bafaecd x86-64: support native xadd rwsem implementation > > which is the one that actually makes x86-64 able to use the xadd version. > > Linus -- 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