diff options
| author | Lee Schermerhorn <lee.schermerhorn@hp.com> | 2012-10-25 14:16:32 +0200 |
|---|---|---|
| committer | Mel Gorman <mgorman@suse.de> | 2012-12-11 14:42:43 +0000 |
| commit | b24f53a0bea38b266d219ee651b22dba727c44ae (patch) | |
| tree | f85431707b44913a412efb5483dc366c310aab5e /include/uapi | |
| parent | 4daae3b4b9e49b7e0935499a352f1c59d90287d2 (diff) | |
mm: mempolicy: Add MPOL_MF_LAZY
NOTE: Once again there is a lot of patch stealing and the end result
is sufficiently different that I had to drop the signed-offs.
Will re-add if the original authors are ok with that.
This patch adds another mbind() flag to request "lazy migration". The
flag, MPOL_MF_LAZY, modifies MPOL_MF_MOVE* such that the selected
pages are marked PROT_NONE. The pages will be migrated in the fault
path on "first touch", if the policy dictates at that time.
"Lazy Migration" will allow testing of migrate-on-fault via mbind().
Also allows applications to specify that only subsequently touched
pages be migrated to obey new policy, instead of all pages in range.
This can be useful for multi-threaded applications working on a
large shared data area that is initialized by an initial thread
resulting in all pages on one [or a few, if overflowed] nodes.
After PROT_NONE, the pages in regions assigned to the worker threads
will be automatically migrated local to the threads on 1st touch.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/mempolicy.h | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/include/uapi/linux/mempolicy.h b/include/uapi/linux/mempolicy.h index 472de8a5d37..6a1baae3775 100644 --- a/include/uapi/linux/mempolicy.h +++ b/include/uapi/linux/mempolicy.h @@ -49,9 +49,16 @@ enum mpol_rebind_step { /* Flags for mbind */ #define MPOL_MF_STRICT (1<<0) /* Verify existing pages in the mapping */ -#define MPOL_MF_MOVE (1<<1) /* Move pages owned by this process to conform to mapping */ -#define MPOL_MF_MOVE_ALL (1<<2) /* Move every page to conform to mapping */ -#define MPOL_MF_INTERNAL (1<<3) /* Internal flags start here */ +#define MPOL_MF_MOVE (1<<1) /* Move pages owned by this process to conform + to policy */ +#define MPOL_MF_MOVE_ALL (1<<2) /* Move every page to conform to policy */ +#define MPOL_MF_LAZY (1<<3) /* Modifies '_MOVE: lazy migrate on fault */ +#define MPOL_MF_INTERNAL (1<<4) /* Internal flags start here */ + +#define MPOL_MF_VALID (MPOL_MF_STRICT | \ + MPOL_MF_MOVE | \ + MPOL_MF_MOVE_ALL | \ + MPOL_MF_LAZY) /* * Internal flags that share the struct mempolicy flags word with |