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From: David Rientjes <rientjes@google.com>
To: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Cc: Paul Jackson <pj@sgi.com>,
	akpm@linux-foundation.org, clameter@sgi.com, ak@suse.de,
	linux-kernel@vger.kernel.org
Subject: Re: [patch -mm 2/2] mempolicy: use default_policy mode instead of MPOL_DEFAULT
Date: Sat, 8 Mar 2008 14:20:14 -0800 (PST)	[thread overview]
Message-ID: <alpine.DEB.1.00.0803081414460.12095@chino.kir.corp.google.com> (raw)
In-Reply-To: <1205003580.4918.21.camel@localhost>

On Sat, 8 Mar 2008, Lee Schermerhorn wrote:

> I have a patch queued up, waiting for things to settle down in
> mempolicy.c, to replace the policy/mode in default_policy with
> MPOL_PREFERRED with preferred_node = -1.  Then, we can remove all of the
> MPOL_DEFAULT cases out of the switches in the allocation paths and
> "clean up" the documentation, including man pages.  MPOL_DEFAULT becomes
> simply an API mechanism to request fall back to the surrounding policy
> scope which, to my mind, is what "default policy" means.
> 

Ok, I'll await your patch that switches default_policy.policy to 
MPOL_PREFERRED.

Using MPOL_DEFAULT purely for falling back to the task or system-wide 
policy, however, seems confusing.  The semantics seem to indicate that 
MPOL_DEFAULT represents the system-wide default policy without any 
preferred node or set of nodes to bind or interleave.  So if a VMA has a 
policy of MPOL_DEFAULT then, to me, it seems like that indicates the 
absence of a specific policy, not a mandate to fallback to the task 
policy.

  reply	other threads:[~2008-03-08 22:20 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-08  1:24 [patch -mm 1/2] mempolicy: disallow static or relative flags for local preferred mode David Rientjes
2008-03-08  1:24 ` [patch -mm 2/2] mempolicy: use default_policy mode instead of MPOL_DEFAULT David Rientjes
2008-03-08  1:28   ` Paul Jackson
2008-03-08  1:33     ` David Rientjes
2008-03-08  1:35       ` Paul Jackson
2008-03-08  1:59         ` Christoph Lameter
2008-03-08  2:14           ` David Rientjes
2008-03-08 19:13       ` Lee Schermerhorn
2008-03-08 22:20         ` David Rientjes [this message]
2008-03-08 23:19           ` Andi Kleen
2008-03-10 13:48             ` Lee Schermerhorn
2008-03-10 19:09 ` [patch -mm 1/2] mempolicy: disallow static or relative flags for local preferred mode Andrew Morton

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