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kmemleak: Allow kmemleak metadata allocations to fail 

This patch adds __GFP_NORETRY and __GFP_NOMEMALLOC flags to the kmemleak
metadata allocations so that it has a smaller effect on the users of the
kernel slab allocator. Since kmemleak allocations can now fail more
often, this patch also reduces the verbosity by passing __GFP_NOWARN and
not dumping the stack trace when a kmemleak allocation fails.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Toralf Förster <toralf.foerster@gmx.de>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Ted Ts'o <tytso@mit.edu>
This commit is contained in:
Catalin Marinas 2011-01-27 10:30:26 +00:00
parent 0a08739e81
commit 6ae4bd1f0b
1 changed files with 8 additions and 5 deletions
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13
mm/kmemleak.c
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@ -113,7 +113,9 @@
#define BYTES_PER_POINTER sizeof(void *)
/* GFP bitmask for kmemleak internal allocations */
#define GFP_KMEMLEAK_MASK (GFP_KERNEL | GFP_ATOMIC)
#define gfp_kmemleak_mask(gfp) (((gfp) & (GFP_KERNEL | GFP_ATOMIC)) | \
__GFP_NORETRY | __GFP_NOMEMALLOC | \
__GFP_NOWARN)
/* scanning area inside a memory block */
struct kmemleak_scan_area {
@ -511,9 +513,10 @@ static struct kmemleak_object *create_object(unsigned long ptr, size_t size,
struct kmemleak_object *object;
struct prio_tree_node *node;
object = kmem_cache_alloc(object_cache, gfp & GFP_KMEMLEAK_MASK);
object = kmem_cache_alloc(object_cache, gfp_kmemleak_mask(gfp));
if (!object) {
kmemleak_stop("Cannot allocate a kmemleak_object structure\n");
pr_warning("Cannot allocate a kmemleak_object structure\n");
kmemleak_disable();
return NULL;
}
@ -734,9 +737,9 @@ static void add_scan_area(unsigned long ptr, size_t size, gfp_t gfp)
return;
}
area = kmem_cache_alloc(scan_area_cache, gfp & GFP_KMEMLEAK_MASK);
area = kmem_cache_alloc(scan_area_cache, gfp_kmemleak_mask(gfp));
if (!area) {
kmemleak_warn("Cannot allocate a scan area\n");
pr_warning("Cannot allocate a scan area\n");
goto out;
}