linux-kernel - Re: [PATCH 01/45] Create a dynamically sized pool of threads for doing very slow work items [ver #41]

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Message-ID: <20081219041906.GA30320@us.ibm.com>
Date:	Thu, 18 Dec 2008 22:19:06 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	David Howells <dhowells@...hat.com>
Cc:	trond.myklebust@....uio.no, viro@...IV.linux.org.uk,
	nfsv4@...ux-nfs.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 01/45] Create a dynamically sized pool of threads for
	doing very slow work items [ver #41]

Quoting David Howells (dhowells@...hat.com):
> Create a dynamically sized pool of threads for doing very slow work items, such
> as invoking mkdir() or rmdir() - things that may take a long time and may
> sleep, holding mutexes/semaphores and hogging a thread, and are thus unsuitable
> for workqueues.
> 
> The number of threads is always at least a settable minimum, but more are
> started when there's more work to do, up to a limit.  Because of the nature of
> the load, it's not suitable for a 1-thread-per-CPU type pool.  A system with
> one CPU may well want several threads.
> 
> This is used by FS-Cache to do slow caching operations in the background, such
> as looking up, creating or deleting cache objects.
> 
> Signed-off-by: David Howells <dhowells@...hat.com>

Acked-by: Serge Hallyn <serue@...ibm.com>
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