[PATCH] tmpfs: recommend remount for mpol

[PATCH] tmpfs: recommend remount for mpol

[Hugh Dickins]

akpm points out that switching to a non-NUMA kernel could be irritating
if mounting tmpfs fails on an mpol option: tmpfs.txt recommend remount.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
---

 Documentation/filesystems/tmpfs.txt |    9 +++++++++
 1 files changed, 9 insertions(+)

--- 2.6.16-rc4-git7/Documentation/filesystems/tmpfs.txt	2006-02-24 19:56:07.000000000 +0000
+++ linux/Documentation/filesystems/tmpfs.txt	2006-02-24 19:56:45.000000000 +0000
@@ -92,6 +92,15 @@ 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
 
+Note that trying to mount a tmpfs with an mpol option will fail if the
+running kernel does not support NUMA; and will fail if its nodelist
+specifies a node >= MAX_NUMNODES.  If your system relies on that tmpfs
+being mounted, but from time to time runs a kernel built without NUMA
+capability (perhaps a safe recovery kernel), or configured to support
+fewer nodes, then it is advisable to omit the mpol option from automatic
+mount options.  It can be added later, when the tmpfs is already mounted
+on MountPoint, by 'mount -o remount,mpol=Policy:NodeList MountPoint'.
+
 
 To specify the initial root directory you can use the following mount
 options: