diff options
| author | Lee Schermerhorn <Lee.Schermerhorn@hp.com> | 2007-10-16 01:24:51 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 09:42:54 -0700 |
| commit | 754af6f5a85fcd1ecb456851d20c65e4c6ce10ab (patch) | |
| tree | 8c985bfd704a8c993d6ca992725969c6fc5c9e5a /mm/mempolicy.c | |
| parent | 32a4330d4156e55a4888a201f484dbafed9504ed (diff) | |
| download | lwn-754af6f5a85fcd1ecb456851d20c65e4c6ce10ab.tar.gz lwn-754af6f5a85fcd1ecb456851d20c65e4c6ce10ab.zip | |
Mem Policy: add MPOL_F_MEMS_ALLOWED get_mempolicy() flag
Allow an application to query the memories allowed by its context.
Updated numa_memory_policy.txt to mention that applications can use this to
obtain allowed memories for constructing valid policies.
TODO: update out-of-tree libnuma wrapper[s], or maybe add a new
wrapper--e.g., numa_get_mems_allowed() ?
Also, update numa syscall man pages.
Tested with memtoy V>=0.13.
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Acked-by: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mempolicy.c')
| -rw-r--r-- | mm/mempolicy.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 3a45b7dd0a09..ccbdb22147bb 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -526,8 +526,18 @@ long do_get_mempolicy(int *policy, nodemask_t *nmask, struct mempolicy *pol = current->mempolicy; cpuset_update_task_memory_state(); - if (flags & ~(unsigned long)(MPOL_F_NODE|MPOL_F_ADDR)) + if (flags & + ~(unsigned long)(MPOL_F_NODE|MPOL_F_ADDR|MPOL_F_MEMS_ALLOWED)) return -EINVAL; + + if (flags & MPOL_F_MEMS_ALLOWED) { + if (flags & (MPOL_F_NODE|MPOL_F_ADDR)) + return -EINVAL; + *policy = 0; /* just so it's initialized */ + *nmask = cpuset_current_mems_allowed; + return 0; + } + if (flags & MPOL_F_ADDR) { down_read(&mm->mmap_sem); vma = find_vma_intersection(mm, addr, addr+1); |