On Tue, Apr 26, 2011 at 4:47 AM, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote: > On Mon, 2011-04-25 at 19:44 +0900, Geunsik Lim wrote: >>   Originally, We aim to not hold locks for too long (for scheduling latency reasons). >>   So zap pages in ZAP_BLOCK_SIZE byte counts. >>   This means we need to return the ending mmu_gather to the caller. > > Please have a look at the mmu_gather rewrite that hit -mm last week, > that completely does away with ZAP_BLOCK_SIZE and renders these patches > obsolete. Yes. I also checked the patch that you stated at LKML mailing list previously. In my thinking. I want to keep ZAP_BLOCK_SIZE related contents that adjusted by Ingo, Robert, Andrew, and so on a long time ago because I believe that we can overcome below problems sufficiently in real world. . LKML archive - http://lkml.org/lkml/2002/7/24/273 . LKML archive - http://lkml.org/lkml/2004/9/14/101 In my experience, I did overcome below problems with this patch based on ZAP_BLOCK_SIZE. 1) To solve temporal CPU contention (e.g: case that cpu contention is 93% ~ 96% according to mmap/munmap to access mass files ) 2) To get real-time or real-fast selectively on specified linux system ( demo: http://www.youtube.com/watch?v=PxcgvDTY5F0 ) > > Also, -rt doesn't care since it already has preemptible mmu_gather. > > Furthermore: > >> +L:   linux-rt-users@xxxxxxxxxxxxxxx Sorry. I think that I have to add "linux-rt-users@xxxxxxxxxxxxxxx" because this patch is related to scheduling latencies although this modification is in ./linux-2.6/mm/ directory. I will remove "+L: linux-rt-users******" if really linux-rt-users mailing list can not care. > > is complete crap, linux-rt-users is _NOT_ a development list. > > -- Regards, Geunsik Lim ( Samsung Electronics ) Blog : http://blog.naver.com/invain/ e-Mail: geunsik.lim@xxxxxxxxxxx     Â leemgs@xxxxxxxxx , leemgs1@xxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html