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authorJoonsoo Kim <iamjoonsoo.kim@lge.com>2016-03-16 00:54:06 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-16 02:55:16 +0300
commit12c61fe9b763812adac44522100527caf534462e (patch)
tree3de33e3612903cc60a974f8cd9011a9eba6e6694 /mm/slab.c
parent9f706d6820d3ea776d6b3fc0c1de9f81eb0d021b (diff)
downloadlinux-12c61fe9b763812adac44522100527caf534462e.tar.xz
mm/slab: fix stale code comment
This patchset implements a new freed object management way, that is, OBJFREELIST_SLAB. Purpose of it is to reduce memory overhead in SLAB. SLAB needs a array to manage freed objects in a slab. If there is leftover after objects are packed into a slab, we can use it as a management array, and, in this case, there is no memory waste. But, in the other cases, we need to allocate extra memory for a management array or utilize dedicated internal memory in a slab for it. Both cases causes memory waste so it's not good. With this patchset, freed object itself can be used for a management array. So, memory waste could be reduced. Detailed idea and numbers are described in last patch's commit description. Please refer it. In fact, I tested another idea implementing OBJFREELIST_SLAB with extendable linked array through another freed object. It can remove memory waste completely but it causes more computational overhead in critical lock path and it seems that overhead outweigh benefit. So, this patchset doesn't include it. I will attach prototype just for a reference. This patch (of 16): We use freelist_idx_t type for free object management whose size would be smaller than size of unsigned int. Fix it. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slab.c')
-rw-r--r--mm/slab.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/slab.c b/mm/slab.c
index b3eca034d0b4..23fc4b00d0ce 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -537,7 +537,7 @@ static void cache_estimate(unsigned long gfporder, size_t buffer_size,
* on it. For the latter case, the memory allocated for a
* slab is used for:
*
- * - One unsigned int for each object
+ * - One freelist_idx_t for each object
* - Padding to respect alignment of @align
* - @buffer_size bytes for each object
*