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mm: mempolicy: Make MPOL_LOCAL a real policy

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Make MPOL_LOCAL a real and exposed policy such that applications that
relied on the previous default behaviour can explicitly request it.

Requested-by: Christoph Lameter <cl@linux.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
This commit is contained in:
Peter Zijlstra 2012-10-25 14:16:28 +02:00 committed by Mel Gorman
parent d10e63f294
commit 479e2802d0
2 changed files with 7 additions and 3 deletions
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1
include/uapi/linux/mempolicy.h
View file

@ -20,6 +20,7 @@ enum {
MPOL_PREFERRED,
MPOL_BIND,
MPOL_INTERLEAVE,
MPOL_LOCAL,
MPOL_MAX, /* always last member of enum */
};

9
mm/mempolicy.c
View file

@ -269,6 +269,10 @@ static struct mempolicy *mpol_new(unsigned short mode, unsigned short flags,
(flags & MPOL_F_RELATIVE_NODES)))
return ERR_PTR(-EINVAL);
}
} else if (mode == MPOL_LOCAL) {
if (!nodes_empty(*nodes))
return ERR_PTR(-EINVAL);
mode = MPOL_PREFERRED;
} else if (nodes_empty(*nodes))
return ERR_PTR(-EINVAL);
policy = kmem_cache_alloc(policy_cache, GFP_KERNEL);
@ -2399,7 +2403,6 @@ void numa_default_policy(void)
* "local" is pseudo-policy: MPOL_PREFERRED with MPOL_F_LOCAL flag
* Used only for mpol_parse_str() and mpol_to_str()
*/
#define MPOL_LOCAL MPOL_MAX
static const char * const policy_modes[] =
{
[MPOL_DEFAULT] = "default",
@ -2452,12 +2455,12 @@ int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context)
if (flags)
*flags++ = '\0'; /* terminate mode string */
for (mode = 0; mode <= MPOL_LOCAL; mode++) {
for (mode = 0; mode < MPOL_MAX; mode++) {
if (!strcmp(str, policy_modes[mode])) {
break;
}
}
if (mode > MPOL_LOCAL)
if (mode >= MPOL_MAX)
goto out;
switch (mode) {