linux-kernel - Re: [PATCH] sunrpc: use better NUMA affinities

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Message-ID: <20110729234857.GA30941@fieldses.org>
Date:	Fri, 29 Jul 2011 19:48:57 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	NeilBrown <neilb@...e.de>
Cc:	Greg Banks <gnb@...tmail.fm>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Christoph Hellwig <hch@...radead.org>,
	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] sunrpc: use better NUMA affinities

On Sat, Jul 30, 2011 at 09:30:25AM +1000, NeilBrown wrote:
> On Sat, 30 Jul 2011 06:34:44 +1000 Greg Banks <gnb@...tmail.fm> wrote:
> 
> > 
> > 
> > Sent from my iPhone
> > 
> > On 30/07/2011, at 2:53, "J. Bruce Fields" <bfields@...ldses.org> wrote:
> > 
> > > On Fri, Jul 29, 2011 at 12:48:36PM -0400, bfields wrote:
> > >> On Fri, Jul 29, 2011 at 11:30:05PM +1000, Greg Banks wrote:
> > >>>
> > >>>
> > >>> Sent from my iPhone
> > >>>
> > >>> On 29/07/2011, at 22:11, Eric Dumazet <eric.dumazet@...il.com>  
> > >>> wrote:
> > >>>
> > >>>> Le vendredi 29 juillet 2011 à 21:58 +1000, Greg Banks a écrit :
> > >>>>
> > >>>>>
> > >>>>> Sure, and a whole lot of the callsites are ("..._%d", cpu),  
> > >>>>> hence the
> > >>>>> unfortune :(
> > >>>>
> > >>>> BTW, we could name nfsd threads differently :
> > >>>>
> > >>>> Currently, they all are named : "nfsd"
> > >>>>
> > >>>> If SVC_POOL_PERCPU is selected, we could name them :
> > >>>> nfsd_c0 -> nfsd_cN
> > >>>>
> > >>>> If SVC_POOL_PERNODE is selected, we could name them :
> > >>>> nfsd_n0  -> nfsd_nN
> > >>>>
> > >>>> That would help to check with "ps aux" which cpu/nodes are under
> > >>>> stress.
> > >>>>
> > >>>>
> > >>>
> > >>> I like it!
> > >>
> > >> Yup, patch welcomed.--b.
> > >
> > > (Annoying fact: some initscripts stop nfsd using a rough equivalent of
> > > "killall nfsd".  So the name of the threads is arguably ABI.  I think
> > > those initscripts are nuts and deserve what they get, but that may be
> > > because I'm forgetting the reason they do that.)
> > >
> > 
> > We had this discussion in May-June 2008; it's because the nfsds were  
> > once  many many years ago userspace threads.
> 
> Even when they became kernel threads, 'kill' was the only way to kill them -
> at first.
> 
> > 
> > The "killall nfsd" semantics in those scripts are awful and lead to  
> > problems shutting down when there are lots of threads. It would  
> > probably be an improvement to provide a better shutdown mechanism and  
> > force distros to use it.
> 
> rpc.nfsd 0
> 
> will stop all nfsd threads.  Follow with
> 
>   exportfs -f
> 
> and you should be done.  I'm not 100% sure about the nfsv4 thread though -
> would need to check.

Should be fine.

--b.
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