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mm, page_owner: convert page_owner_inited to static key

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CONFIG_PAGE_OWNER attempts to impose negligible runtime overhead when
enabled during compilation, but not actually enabled during runtime by
boot param page_owner=on.  This overhead can be further reduced using
the static key mechanism, which this patch does.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vlastimil Babka
2016-03-15 14:56:12 -07:00
committed by Linus Torvalds
parent 60f30350fd
commit 7dd80b8af0
4 changed files with 21 additions and 21 deletions
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9
mm/page_owner.c
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@@ -5,10 +5,11 @@
#include <linux/bootmem.h>
#include <linux/stacktrace.h>
#include <linux/page_owner.h>
#include <linux/jump_label.h>
#include "internal.h"
static bool page_owner_disabled = true;
bool page_owner_inited __read_mostly;
DEFINE_STATIC_KEY_FALSE(page_owner_inited);
static void init_early_allocated_pages(void);
@@ -37,7 +38,7 @@ static void init_page_owner(void)
if (page_owner_disabled)
return;
page_owner_inited = true;
static_branch_enable(&page_owner_inited);
init_early_allocated_pages();
}
@@ -147,7 +148,7 @@ read_page_owner(struct file *file, char __user *buf, size_t count, loff_t *ppos)
struct page *page;
struct page_ext *page_ext;
if (!page_owner_inited)
if (!static_branch_unlikely(&page_owner_inited))
return -EINVAL;
page = NULL;
@@ -295,7 +296,7 @@ static int __init pageowner_init(void)
{
struct dentry *dentry;
if (!page_owner_inited) {
if (!static_branch_unlikely(&page_owner_inited)) {
pr_info("page_owner is disabled\n");
return 0;
}