On Fri, Oct 22, 2010 at 09:34:52PM +0400, Dmitry Monakhov wrote: > From: Dmitry Monakhov <dmonakhov@xxxxxxxxx> > > Currently quota_hash[] is global, which is bad for scalability. > Also is is the last user of global dq_list_lock. > It is reasonable to introduce dedicated hash for each super_block > which use quota. > > per-sb hash will be allocated only when necessary (on first quota_on()) > Protected by per-sb dq_list_lock. Ugh... Why not a common hash with per-chain spinlock? We'll waste less memory on those than on hash chain heads even for a couple of superblocks and unless you've got boxen with more (quota'd) superblocks than hash chains, you'll get less contention... -- 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
