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From: Paul Jackson <pj@sgi.com>
To: David Rientjes <rientjes@google.com>
Cc: akpm@linux-foundation.org, clameter@sgi.com,
Lee.Schermerhorn@hp.com, ak@suse.de, randy.dunlap@oracle.com,
linux-kernel@vger.kernel.org
Subject: Re: [patch 6/6] mempolicy: update NUMA memory policy documentation
Date: Tue, 26 Feb 2008 11:34:41 -0600 [thread overview]
Message-ID: <20080226113441.934c8c90.pj@sgi.com> (raw)
In-Reply-To: <alpine.DEB.1.00.0802250016380.12368@chino.kir.corp.google.com>
+ MPOL_F_RELATIVE_NODES: This flag specifies that the nodemask passed
+ by the user should remain in the same context as it is for the
+ current task or VMA's set of accessible nodes after the memory
+ policy has been defined.
+
+ Without this flag (and without MPOL_F_STATIC_NODES), anytime a
+ mempolicy is rebound because of a change in the set of
+ accessible nodes, the node (Preferred) or nodemask (Bind,
+ Interleave) is remapped to the new set of accessible nodes.
+ With this flag, the remap is done to ensure the context of the
+ previous nodemask with its set of allowed mems is preserved.
Hmmm ... I've read this several times now ... still can't figure out
what it's saying ;). And it doesn't really explain key aspects of
MPOL_F_RELATIVE_NODES, such as that it provides cpuset relative
numbering (use nodes 0..N-1, regardless of your current cpuset, to
refer to the first N nodes in whatever is your current cpuset.)
Perhaps we'd be further ahead of the game if you started with the
documentation changes to Documentation/vm/numa_memory_policy.txt,
in my patch:
Date: Sun, 23 Dec 2007 22:24:02 -0600
From: Paul Jackson <pj@sgi.com>
To: David Rientjes <rientjes@google.com>
Cc: Lee.Schermerhorn@hp.com, clameter@sgi.com
Subject: Re: [RFC] cpuset relative memory policies - second choice
Message-Id: <20071223222402.5486bf0a.pj@sgi.com>
Change MPOL_MASK_REL to MPOL_F_RELATIVE_NODES and similar changes.
--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <pj@sgi.com> 1.940.382.4214
next prev parent reply other threads:[~2008-02-26 17:34 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-25 15:35 [patch 1/6] mempolicy: convert MPOL constants to enum David Rientjes
2008-02-25 15:35 ` [patch 2/6] mempolicy: support optional mode flags David Rientjes
2008-02-25 15:35 ` [patch 3/6] mempolicy: add MPOL_F_STATIC_NODES flag David Rientjes
2008-02-25 15:35 ` [patch 4/6] mempolicy: add bitmap_onto() and bitmap_fold() operations David Rientjes
2008-02-25 15:35 ` [patch 5/6] mempolicy: add MPOL_F_RELATIVE_NODES flag David Rientjes
2008-02-25 15:35 ` [patch 6/6] mempolicy: update NUMA memory policy documentation David Rientjes
2008-02-26 17:34 ` Paul Jackson [this message]
2008-02-26 21:23 ` David Rientjes
2008-02-26 6:12 ` [patch 5/6] mempolicy: add MPOL_F_RELATIVE_NODES flag Paul Jackson
2008-02-26 6:45 ` David Rientjes
2008-02-26 17:44 ` Paul Jackson
2008-02-26 21:17 ` David Rientjes
2008-02-26 21:30 ` Paul Jackson
2008-02-26 21:27 ` Lee Schermerhorn
2008-02-27 1:17 ` David Rientjes
2008-02-27 1:31 ` David Rientjes
2008-02-27 2:30 ` Paul Jackson
2008-02-27 15:37 ` Lee Schermerhorn
2008-02-27 17:09 ` Paul Jackson
2008-02-28 21:08 ` David Rientjes
2008-02-26 5:46 ` [patch 3/6] mempolicy: add MPOL_F_STATIC_NODES flag Paul Jackson
2008-02-26 6:53 ` David Rientjes
2008-02-26 17:56 ` Paul Jackson
2008-02-26 21:02 ` David Rientjes
2008-02-26 21:32 ` Lee Schermerhorn
2008-02-26 21:54 ` David Rientjes
2008-02-26 22:08 ` Paul Jackson
2008-02-26 21:39 ` Paul Jackson
2008-02-26 3:20 ` [patch 1/6] mempolicy: convert MPOL constants to enum Paul Jackson
2008-02-26 3:35 ` David Rientjes
2008-02-26 4:02 ` Paul Jackson
2008-02-26 4:21 ` David Rientjes
2008-02-26 4:46 ` Paul Jackson
2008-02-27 19:35 ` Christoph Lameter
2008-02-27 19:59 ` David Rientjes
2008-03-01 0:44 David Rientjes
2008-03-01 0:45 ` [patch 2/6] mempolicy: support optional mode flags David Rientjes
2008-03-01 0:45 ` [patch 3/6] mempolicy: add MPOL_F_STATIC_NODES flag David Rientjes
2008-03-01 0:45 ` [patch 4/6] mempolicy: add bitmap_onto() and bitmap_fold() operations David Rientjes
2008-03-01 0:45 ` [patch 5/6] mempolicy: add MPOL_F_RELATIVE_NODES flag David Rientjes
2008-03-01 0:45 ` [patch 6/6] mempolicy: update NUMA memory policy documentation David Rientjes
2008-03-01 0:55 ` Randy Dunlap
2008-03-01 1:14 ` David Rientjes
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