On 5/22/14, 5:47 AM, Niu Yawei wrote: > There are several global locks in the VFS quota code which hurts > performance a lot when quota accounting enabled, dqptr_sem is the major one. > > This patch tries to make the VFS quota code scalable with minimal changes. > > Following tests (mdtest & dbench) were running over ext4 fs in a > centos6.5 vm (8 cpus, 4G mem, kenrel: 3.15.0-rc5+), and the result shows > the patch relieved the lock congestion a lot. > Just noticed this patch - FWIW, Lustre has a "quota-replace-dqptr-sem-sles11sp2.patch" that they apply: http://git.whamcloud.com/?p=fs/lustre-release.git;a=blob;f=lustre/kernel_patches/patches/quota-replace-dqptr-sem-sles11sp2.patch;h=c880dac83473f48cac96dc467ea76f64a74fe5dd;hb=HEAD which might be interesting if you're looking at this. (Or maybe it's doing the same thing; TBH I have not looked at either patch, I just remembered that it existed...) -eric -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
