On Wed, 27 Oct 2010 20:31:09 +0100, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote: > 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... Ok, i'll use "kernel: add bl_list" per-backet list implementation from nick@. > -- > 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 -- 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
