linux-kernel - [PATCH 2/4] mm: numa: Remove migrate

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Date:	Sat,  7 Mar 2015 15:20:49 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Dave Chinner <david@...morbit.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>, xfs@....sgi.com,
	linuxppc-dev@...ts.ozlabs.org, Mel Gorman <mgorman@...e.de>
Subject: [PATCH 2/4] mm: numa: Remove migrate_ratelimited

This code is dead since commit 9e645ab6d089 ("sched/numa: Continue PTE
scanning even if migrate rate limited") so remove it.

Signed-off-by: Mel Gorman <mgorman@...e.de>
---
 include/linux/migrate.h |  5 -----
 mm/migrate.c            | 20 --------------------
 2 files changed, 25 deletions(-)

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 78baed5f2952..cac1c0904d5f 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -69,7 +69,6 @@ static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
 extern bool pmd_trans_migrating(pmd_t pmd);
 extern int migrate_misplaced_page(struct page *page,
 				  struct vm_area_struct *vma, int node);
-extern bool migrate_ratelimited(int node);
 #else
 static inline bool pmd_trans_migrating(pmd_t pmd)
 {
@@ -80,10 +79,6 @@ static inline int migrate_misplaced_page(struct page *page,
 {
 	return -EAGAIN; /* can't migrate now */
 }
-static inline bool migrate_ratelimited(int node)
-{
-	return false;
-}
 #endif /* CONFIG_NUMA_BALANCING */
 
 #if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
diff --git a/mm/migrate.c b/mm/migrate.c
index 85e042686031..6aa9a4222ea9 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1554,30 +1554,10 @@ static struct page *alloc_misplaced_dst_page(struct page *page,
  * page migration rate limiting control.
  * Do not migrate more than @pages_to_migrate in a @migrate_interval_millisecs
  * window of time. Default here says do not migrate more than 1280M per second.
- * If a node is rate-limited then PTE NUMA updates are also rate-limited. However
- * as it is faults that reset the window, pte updates will happen unconditionally
- * if there has not been a fault since @pteupdate_interval_millisecs after the
- * throttle window closed.
  */
 static unsigned int migrate_interval_millisecs __read_mostly = 100;
-static unsigned int pteupdate_interval_millisecs __read_mostly = 1000;
 static unsigned int ratelimit_pages __read_mostly = 128 << (20 - PAGE_SHIFT);
 
-/* Returns true if NUMA migration is currently rate limited */
-bool migrate_ratelimited(int node)
-{
-	pg_data_t *pgdat = NODE_DATA(node);
-
-	if (time_after(jiffies, pgdat->numabalancing_migrate_next_window +
-				msecs_to_jiffies(pteupdate_interval_millisecs)))
-		return false;
-
-	if (pgdat->numabalancing_migrate_nr_pages < ratelimit_pages)
-		return false;
-
-	return true;
-}
-
 /* Returns true if the node is migrate rate-limited after the update */
 static bool numamigrate_update_ratelimit(pg_data_t *pgdat,
 					unsigned long nr_pages)
-- 
2.1.2

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