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authorMel Gorman <mgorman@suse.de>2015-06-30 14:57:23 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-06-30 19:44:56 -0700
commit74033a798f5a5db368126ee6f690111cf019bf7a (patch)
tree7abfc3ab462cb45a07615e85c0f996089c63891e
parentac5d2539b2382689b1cdb90bd60dcd49f61c2773 (diff)
mm: meminit: remove mminit_verify_page_links
mminit_verify_page_links() is an extremely paranoid check that was introduced when memory initialisation was being heavily reworked. Profiles indicated that up to 10% of parallel memory initialisation was spent on checking this for every page. The cost could be reduced but in practice this check only found problems very early during the initialisation rewrite and has found nothing since. This patch removes an expensive unnecessary check. Signed-off-by: Mel Gorman <mgorman@suse.de> Tested-by: Nate Zimmer <nzimmer@sgi.com> Tested-by: Waiman Long <waiman.long@hp.com> Tested-by: Daniel J Blueman <daniel@numascale.com> Acked-by: Pekka Enberg <penberg@kernel.org> Cc: Robin Holt <robinmholt@gmail.com> Cc: Nate Zimmer <nzimmer@sgi.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Waiman Long <waiman.long@hp.com> Cc: Scott Norton <scott.norton@hp.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/internal.h8
-rw-r--r--mm/mm_init.c8
-rw-r--r--mm/page_alloc.c1
3 files changed, 0 insertions, 17 deletions
diff --git a/mm/internal.h b/mm/internal.h
index 71d160437205..a48cbefde8ca 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -362,10 +362,7 @@ do { \
} while (0)
extern void mminit_verify_pageflags_layout(void);
-extern void mminit_verify_page_links(struct page *page,
- enum zone_type zone, unsigned long nid, unsigned long pfn);
extern void mminit_verify_zonelist(void);
-
#else
static inline void mminit_dprintk(enum mminit_level level,
@@ -377,11 +374,6 @@ static inline void mminit_verify_pageflags_layout(void)
{
}
-static inline void mminit_verify_page_links(struct page *page,
- enum zone_type zone, unsigned long nid, unsigned long pfn)
-{
-}
-
static inline void mminit_verify_zonelist(void)
{
}
diff --git a/mm/mm_init.c b/mm/mm_init.c
index 28fbf87b20aa..fdadf918de76 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -131,14 +131,6 @@ void __init mminit_verify_pageflags_layout(void)
BUG_ON(or_mask != add_mask);
}
-void __meminit mminit_verify_page_links(struct page *page, enum zone_type zone,
- unsigned long nid, unsigned long pfn)
-{
- BUG_ON(page_to_nid(page) != nid);
- BUG_ON(page_zonenum(page) != zone);
- BUG_ON(page_to_pfn(page) != pfn);
-}
-
static __init int set_mminit_loglevel(char *str)
{
get_option(&str, &mminit_loglevel);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f1f455a69cef..5a38e39b30d1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -839,7 +839,6 @@ static void __meminit __init_single_page(struct page *page, unsigned long pfn,
unsigned long zone, int nid)
{
set_page_links(page, zone, nid, pfn);
- mminit_verify_page_links(page, zone, nid, pfn);
init_page_count(page);
page_mapcount_reset(page);
page_cpupid_reset_last(page);