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slub: make ->remote_node_defrag_ratio unsigned int

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->remote_node_defrag_ratio is in range 0..1000.

This also adds a check and modifies the behavior to return an error
code.  Before this patch invalid values were ignored.

Link: http://lkml.kernel.org/r/20180305200730.15812-9-adobriyan@gmail.com
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2018-04-05 16:20:48 -07:00 committed by Linus Torvalds
parent ac914d08bb
commit eb7235eb84
2 changed files with 7 additions and 6 deletions
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2
include/linux/slub_def.h
View File

@ -124,7 +124,7 @@ struct kmem_cache {
/*
* Defragmentation by allocating from a remote node.
*/
int remote_node_defrag_ratio;
unsigned int remote_node_defrag_ratio;
#endif
#ifdef CONFIG_SLAB_FREELIST_RANDOM

11
mm/slub.c
View File

@ -5289,21 +5289,22 @@ SLAB_ATTR(shrink);
#ifdef CONFIG_NUMA
static ssize_t remote_node_defrag_ratio_show(struct kmem_cache *s, char *buf)
{
return sprintf(buf, "%d\n", s->remote_node_defrag_ratio / 10);
return sprintf(buf, "%u\n", s->remote_node_defrag_ratio / 10);
}
static ssize_t remote_node_defrag_ratio_store(struct kmem_cache *s,
const char *buf, size_t length)
{
unsigned long ratio;
unsigned int ratio;
int err;
err = kstrtoul(buf, 10, &ratio);
err = kstrtouint(buf, 10, &ratio);
if (err)
return err;
if (ratio > 100)
return -ERANGE;
if (ratio <= 100)
s->remote_node_defrag_ratio = ratio * 10;
s->remote_node_defrag_ratio = ratio * 10;
return length;
}