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Mem Policy: add MPOL_F_MEMS_ALLOWED get_mempolicy() flag

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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 <[email protected]>
Acked-by: Christoph Lameter <[email protected]>
Cc: Andi Kleen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Lee Schermerhorn 2007-10-16 01:24:51 -07:00 • committed by Linus Torvalds
commit 754af6f5a8
3 changed files with 28 additions and 18 deletions
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12
mm/mempolicy.c
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@ -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);