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@xxxxxx> 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>