Re: [PATCH v3 resend] procfs: Improve Scaling in proc

2013-03-04 Thread Stephen Warren
On 03/04/2013 02:00 PM, Nathan Zimmer wrote: > Stephen Warren wrote at Monday, March 04, 2013 2:16 PM: >> On 02/15/2013 01:47 PM, Nathan Zimmer wrote: >>> I am currently tracking a hotlock reported by a customer on a large system, >>> 512 cores. I am currently running 3.8-rc7 but the issue looks l

RE: [PATCH v3 resend] procfs: Improve Scaling in proc

2013-03-04 Thread Nathan Zimmer
13 2:16 PM To: Nathan Zimmer Cc: v...@zeniv.linux.org.uk; eric.duma...@gmail.com; linux-kernel@vger.kernel.org; linux-fsde...@vger.kernel.org; Andrew Morton; Eric W. Biederman; David Woodhouse; Alexey Dobriyan; Paul E. McKenney Subject: Re: [PATCH v3 resend] procfs: Improve Scaling in proc On 02/

Re: [PATCH v3 resend] procfs: Improve Scaling in proc

2013-03-04 Thread Stephen Warren
On 02/15/2013 01:47 PM, Nathan Zimmer wrote: > I am currently tracking a hotlock reported by a customer on a large system, > 512 cores. I am currently running 3.8-rc7 but the issue looks like it has > been > this way for a very long time. > The offending lock is proc_dir_entry->pde_unload_lock. >

Re: [PATCH v3 resend] procfs: Improve Scaling in proc

2013-02-22 Thread Zheng Huai Cheng
在 2013年2月16日星期六UTC+8上午4时49分15秒，Nathan Zimmer写道： > I am currently tracking a hotlock reported by a customer on a large system, > > 512 cores. I am currently running 3.8-rc7 but the issue looks like it has > been > > this way for a very long time. > > The offending lock is proc_dir_entry->pde_un

Re: [PATCH v3 resend] procfs: Improve Scaling in proc

2013-02-15 Thread Andrew Morton
On Fri, 15 Feb 2013 17:39:38 -0600 Nathan Zimmer wrote: > > So are all these games with local variable `llseek' still needed? > > afaict the increment of pde_users will stabilize ->fops? > We still are setting de->proc_fops to NULL to prevent new callers. > Also we still have to save fops-> since

Re: [PATCH v3 resend] procfs: Improve Scaling in proc

2013-02-15 Thread Nathan Zimmer
On 02/15/2013 04:12 PM, Andrew Morton wrote: On Fri, 15 Feb 2013 14:47:54 -0600 Nathan Zimmer wrote: I am currently tracking a hotlock reported by a customer on a large system, 512 cores. I am currently running 3.8-rc7 but the issue looks like it has been this way for a very long time. The of

Re: [PATCH v3 resend] procfs: Improve Scaling in proc

2013-02-15 Thread Andrew Morton
On Fri, 15 Feb 2013 14:47:54 -0600 Nathan Zimmer wrote: > I am currently tracking a hotlock reported by a customer on a large system, > 512 cores. I am currently running 3.8-rc7 but the issue looks like it has > been > this way for a very long time. > The offending lock is proc_dir_entry->pde_u

[PATCH v3 resend] procfs: Improve Scaling in proc

2013-02-15 Thread Nathan Zimmer
I am currently tracking a hotlock reported by a customer on a large system, 512 cores. I am currently running 3.8-rc7 but the issue looks like it has been this way for a very long time. The offending lock is proc_dir_entry->pde_unload_lock. This patch converts the replaces the lock with the rcu.