mempolicy: rename mpol_free to mpol_put
commitf0be3d32b05d3fea2fcdbbb81a39dac2a7163169
authorLee Schermerhorn <lee.schermerhorn@hp.com>
Mon, 28 Apr 2008 09:13:08 +0000 (28 02:13 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Mon, 28 Apr 2008 15:58:23 +0000 (28 08:58 -0700)
tree5794ce6a8befbce82cd3e44ff15fbf3bb5f2f3bf
parent3b1163006332302117b1b2acf226d4014ff46525
mempolicy: rename mpol_free to mpol_put

This is a change that was requested some time ago by Mel Gorman.  Makes sense
to me, so here it is.

Note: I retain the name "mpol_free_shared_policy()" because it actually does
free the shared_policy, which is NOT a reference counted object.  However, ...

The mempolicy object[s] referenced by the shared_policy are reference counted,
so mpol_put() is used to release the reference held by the shared_policy.  The
mempolicy might not be freed at this time, because some task attached to the
shared object associated with the shared policy may be in the process of
allocating a page based on the mempolicy.  In that case, the task performing
the allocation will hold a reference on the mempolicy, obtained via
mpol_shared_policy_lookup().  The mempolicy will be freed when all tasks
holding such a reference have called mpol_put() for the mempolicy.

Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/mempolicy.h
kernel/exit.c
kernel/fork.c
mm/hugetlb.c
mm/mempolicy.c
mm/mmap.c
mm/shmem.c