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authorGanesh Mahendran <opensource.ganesh@gmail.com>2016-07-28 15:47:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-28 16:07:41 -0700
commit64d90465f01325653deb8503aec4ca48ca3e9580 (patch)
treee11e75ae92f8f4df349115af4c136c46e75de330
parentb4fd07a0864a06d7a8b20a624d851736330d6fd8 (diff)
mm/zsmalloc: avoid calculate max objects of zspage twice
Currently, if a class can not be merged, the max objects of zspage in that class may be calculated twice. This patch calculate max objects of zspage at the begin, and pass the value to can_merge() to decide whether the class can be merged. Also this patch remove function get_maxobj_per_zspage(), as there is no other place to call this function. Link: http://lkml.kernel.org/r/1467882338-4300-4-git-send-email-opensource.ganesh@gmail.com Signed-off-by: Ganesh Mahendran <opensource.ganesh@gmail.com> Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Acked-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/zsmalloc.c26
1 files changed, 10 insertions, 16 deletions
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 72e0b296984b..1ce774503fa1 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -467,11 +467,6 @@ static struct zpool_driver zs_zpool_driver = {
MODULE_ALIAS("zpool-zsmalloc");
#endif /* CONFIG_ZPOOL */
-static unsigned int get_maxobj_per_zspage(int size, int pages_per_zspage)
-{
- return pages_per_zspage * PAGE_SIZE / size;
-}
-
/* per-cpu VM mapping areas for zspage accesses that cross page boundaries */
static DEFINE_PER_CPU(struct mapping_area, zs_map_area);
@@ -1359,16 +1354,14 @@ static void init_zs_size_classes(void)
zs_size_classes = nr;
}
-static bool can_merge(struct size_class *prev, int size, int pages_per_zspage)
+static bool can_merge(struct size_class *prev, int pages_per_zspage,
+ int objs_per_zspage)
{
- if (prev->pages_per_zspage != pages_per_zspage)
- return false;
+ if (prev->pages_per_zspage == pages_per_zspage &&
+ prev->objs_per_zspage == objs_per_zspage)
+ return true;
- if (prev->objs_per_zspage
- != get_maxobj_per_zspage(size, pages_per_zspage))
- return false;
-
- return true;
+ return false;
}
static bool zspage_full(struct size_class *class, struct zspage *zspage)
@@ -2438,6 +2431,7 @@ struct zs_pool *zs_create_pool(const char *name)
for (i = zs_size_classes - 1; i >= 0; i--) {
int size;
int pages_per_zspage;
+ int objs_per_zspage;
struct size_class *class;
int fullness = 0;
@@ -2445,6 +2439,7 @@ struct zs_pool *zs_create_pool(const char *name)
if (size > ZS_MAX_ALLOC_SIZE)
size = ZS_MAX_ALLOC_SIZE;
pages_per_zspage = get_pages_per_zspage(size);
+ objs_per_zspage = pages_per_zspage * PAGE_SIZE / size;
/*
* size_class is used for normal zsmalloc operation such
@@ -2456,7 +2451,7 @@ struct zs_pool *zs_create_pool(const char *name)
* previous size_class if possible.
*/
if (prev_class) {
- if (can_merge(prev_class, size, pages_per_zspage)) {
+ if (can_merge(prev_class, pages_per_zspage, objs_per_zspage)) {
pool->size_class[i] = prev_class;
continue;
}
@@ -2469,8 +2464,7 @@ struct zs_pool *zs_create_pool(const char *name)
class->size = size;
class->index = i;
class->pages_per_zspage = pages_per_zspage;
- class->objs_per_zspage = get_maxobj_per_zspage(class->size,
- class->pages_per_zspage);
+ class->objs_per_zspage = objs_per_zspage;
spin_lock_init(&class->lock);
pool->size_class[i] = class;
for (fullness = ZS_EMPTY; fullness < NR_ZS_FULLNESS;