linux-kernel - Re: [PATCH][RFC]fix soft lock up at NFS mount by per-SB LRU-list of unused dentries

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Message-ID: <20080523042231.GJ173056135@sgi.com>
Date:	Fri, 23 May 2008 14:22:31 +1000
From:	David Chinner <dgc@....com>
To:	Kentaro Makita <k-makita@...css.fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	akpm@...ux-foundation.org, dgc@....com, viro@...IV.linux.org.uk,
	harvey.harrison@...il.com
Subject: Re: [PATCH][RFC]fix soft lock up at NFS mount by per-SB LRU-list of unused dentries

On Fri, May 23, 2008 at 11:15:19AM +0900, Kentaro Makita wrote:
> Hi, David
> 
> Thank you for reviewing the patch.
> I'd fix coding style issues at next post. And,...
> 
> David Chinner wrote:
> > On Thu, May 22, 2008 at 11:22:18AM +0900, Kentaro Makita wrote:
> >> +			}
> >> +		}
> >> +	}
> > 
> > I'm wondering if this loop is an excessively long time to be holding the
> > dcache_lock. I guess the hol dtime is limited by the size of *count being
> > passed in. I think we could also do a:
> > 
> > 		cond_resched_lock(&dcache_lock);
> > 	
> > in the loop here to prevent this from occurring....
> Did you mean:
>  - scan sb->s_dentry_lru and move dentries to temporary list
>    with lock held
>  - cond_resched_lock(&dcache_lock);
>  - prune dentries on temporary list
> Is that right?

No, I meant while scanning sb->s_dentry_lru.

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
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