From: Lee Schermerhorn <lee.schermerhorn@hp.com>
To: linux-mm@kvack.org, linux-numa@vger.kernel.org
Cc: akpm@linux-foundation.org,
Hugh Dickins <hugh.dickins@tiscali.co.uk>,
Ravikiran Thirumalai <kiran@scalex86.org>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Christoph Lameter <cl@linux-foundation.org>,
David Rientjes <rientjes@google.com>,
eric.whitney@hp.com
Subject: [PATCH 6/6] Mempolicy: document cpuset interaction with tmpfs mpol mount option
Date: Fri, 19 Mar 2010 15:00:10 -0400 [thread overview]
Message-ID: <20100319190010.21430.41771.sendpatchset@localhost.localdomain> (raw)
In-Reply-To: <20100319185933.21430.72039.sendpatchset@localhost.localdomain>
Update Documentation/filesystems/tmpfs.txt to describe the
interaction of tmpfs mount option memory policy with tasks'
cpuset mems_allowed.
Note: the mount(8) man page [in the util-linux-ng package]
requires similiar updates.
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Documentation/filesystems/tmpfs.txt | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
Index: linux-2.6.34-rc1-mmotm-100311-1313/Documentation/filesystems/tmpfs.txt
===================================================================
--- linux-2.6.34-rc1-mmotm-100311-1313.orig/Documentation/filesystems/tmpfs.txt 2010-03-19 09:06:15.000000000 -0400
+++ linux-2.6.34-rc1-mmotm-100311-1313/Documentation/filesystems/tmpfs.txt 2010-03-19 11:22:37.000000000 -0400
@@ -94,11 +94,19 @@ NodeList format is a comma-separated lis
a range being two hyphen-separated decimal numbers, the smallest and
largest node numbers in the range. For example, mpol=bind:0-3,5,7,9-15
+A memory policy with a valid NodeList will be saved, as specified, for
+use at file creation time. When a task allocates a file in the file
+system, the mount option memory policy will be applied with a NodeList,
+if any, modified by the calling task's cpuset constraints
+[See Documentation/cgroups/cpusets.txt] and any optional flags, listed
+below. If the resulting NodeLists is the empty set, the effective memory
+policy for the file will revert to "default" policy.
+
NUMA memory allocation policies have optional flags that can be used in
conjunction with their modes. These optional flags can be specified
when tmpfs is mounted by appending them to the mode before the NodeList.
See Documentation/vm/numa_memory_policy.txt for a list of all available
-memory allocation policy mode flags.
+memory allocation policy mode flags and their effect on memory policy.
=static is equivalent to MPOL_F_STATIC_NODES
=relative is equivalent to MPOL_F_RELATIVE_NODES
prev parent reply other threads:[~2010-03-19 19:00 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-19 18:59 [PATCH 0/6] Mempolicy: additional cleanups Lee Schermerhorn
2010-03-19 18:59 ` [PATCH 1/6] Mempolicy: Don't call mpol_set_nodemask() when no_context Lee Schermerhorn
2010-03-22 14:40 ` Christoph Lameter
2010-03-22 16:11 ` Lee Schermerhorn
2010-03-19 18:59 ` [PATCH 2/6] Mempolicy: Lose unnecessary loop variable in mpol_parse_str() Lee Schermerhorn
2010-03-19 18:59 ` [PATCH 3/6] Mempolicy: rename policy_types and cleanup initialization Lee Schermerhorn
2010-03-22 14:43 ` Christoph Lameter
2010-03-22 16:22 ` Lee Schermerhorn
2010-03-19 18:59 ` [PATCH 4/6] Mempolicy: factor mpol_shared_policy_init() return paths Lee Schermerhorn
2010-03-22 14:45 ` Christoph Lameter
2010-03-19 19:00 ` [BUGFIX][PATCH 5/6] Mempolicy: fix get_mempolicy() for relative and static nodes Lee Schermerhorn
2010-03-19 19:00 ` Lee Schermerhorn [this message]
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