diff options
| author | Lee Schermerhorn <[email protected]> | 2012-10-25 14:16:29 +0200 |
|---|---|---|
| committer | Mel Gorman <[email protected]> | 2012-12-11 14:42:40 +0000 |
| commit | d3a710337b0590f43fd236d5e6518439afc7410a (patch) | |
| tree | 19a03d787d1795c8212fc2c9ede5397ba0a32c85 /net/lapb/lapb_iface.c | |
| parent | 479e2802d09f1e18a97262c4c6f8f17ae5884bd8 (diff) | |
mm: mempolicy: Add MPOL_NOOP
This patch augments the MPOL_MF_LAZY feature by adding a "NOOP" policy
to mbind(). When the NOOP policy is used with the 'MOVE and 'LAZY
flags, mbind() will map the pages PROT_NONE so that they will be
migrated on the next touch.
This allows an application to prepare for a new phase of operation
where different regions of shared storage will be assigned to
worker threads, w/o changing policy. Note that we could just use
"default" policy in this case. However, this also allows an
application to request that pages be migrated, only if necessary,
to follow any arbitrary policy that might currently apply to a
range of pages, without knowing the policy, or without specifying
multiple mbind()s for ranges with different policies.
[ Bug in early version of mpol_parse_str() reported by Fengguang Wu. ]
Bug-Reported-by: Reported-by: Fengguang Wu <[email protected]>
Signed-off-by: Lee Schermerhorn <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Linus Torvalds <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Mel Gorman <[email protected]>
Diffstat (limited to 'net/lapb/lapb_iface.c')
0 files changed, 0 insertions, 0 deletions