linux-kernel - [PATCH 2/4] (CMA_AGGRESSIVE) Add argument hibernation to function shrink_all

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Message-ID: <1413430551-22392-3-git-send-email-zhuhui@xiaomi.com>
Date:	Thu, 16 Oct 2014 11:35:49 +0800
From:	Hui Zhu <zhuhui@...omi.com>
To:	<rjw@...ysocki.net>, <len.brown@...el.com>, <pavel@....cz>,
	<m.szyprowski@...sung.com>, <akpm@...ux-foundation.org>,
	<mina86@...a86.com>, <aneesh.kumar@...ux.vnet.ibm.com>,
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CC:	<linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<linux-mm@...ck.org>, Hui Zhu <zhuhui@...omi.com>
Subject: [PATCH 2/4] (CMA_AGGRESSIVE) Add argument hibernation to function shrink_all_memory

Function shrink_all_memory try to free `nr_to_reclaim' of memory.
CMA_AGGRESSIVE_SHRINK function will call this functon to free `nr_to_reclaim' of
memory.  It need different scan_control with current caller function
hibernate_preallocate_memory.

If hibernation is true, the caller is hibernate_preallocate_memory.
if not, the caller is CMA alloc function.

Signed-off-by: Hui Zhu <zhuhui@...omi.com>
---
 include/linux/swap.h    |  3 ++-
 kernel/power/snapshot.c |  2 +-
 mm/vmscan.c             | 19 +++++++++++++------
 3 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/include/linux/swap.h b/include/linux/swap.h
index 37a585b..9f2cb43 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -335,7 +335,8 @@ extern unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
 						gfp_t gfp_mask, bool noswap,
 						struct zone *zone,
 						unsigned long *nr_scanned);
-extern unsigned long shrink_all_memory(unsigned long nr_pages);
+extern unsigned long shrink_all_memory(unsigned long nr_pages,
+				       bool hibernation);
 extern int vm_swappiness;
 extern int remove_mapping(struct address_space *mapping, struct page *page);
 extern unsigned long vm_total_pages;
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 791a618..a00fc35 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1657,7 +1657,7 @@ int hibernate_preallocate_memory(void)
 	 * NOTE: If this is not done, performance will be hurt badly in some
 	 * test cases.
 	 */
-	shrink_all_memory(saveable - size);
+	shrink_all_memory(saveable - size, true);
 
 	/*
 	 * The number of saveable pages in memory was too high, so apply some
diff --git a/mm/vmscan.c b/mm/vmscan.c
index dcb4707..fdcfa30 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3404,7 +3404,7 @@ void wakeup_kswapd(struct zone *zone, int order, enum zone_type classzone_idx)
 	wake_up_interruptible(&pgdat->kswapd_wait);
 }
 
-#ifdef CONFIG_HIBERNATION
+#if defined CONFIG_HIBERNATION || defined CONFIG_CMA_AGGRESSIVE
 /*
  * Try to free `nr_to_reclaim' of memory, system-wide, and return the number of
  * freed pages.
@@ -3413,22 +3413,29 @@ void wakeup_kswapd(struct zone *zone, int order, enum zone_type classzone_idx)
  * LRU order by reclaiming preferentially
  * inactive > active > active referenced > active mapped
  */
-unsigned long shrink_all_memory(unsigned long nr_to_reclaim)
+unsigned long shrink_all_memory(unsigned long nr_to_reclaim, bool hibernation)
 {
 	struct reclaim_state reclaim_state;
 	struct scan_control sc = {
 		.nr_to_reclaim = nr_to_reclaim,
-		.gfp_mask = GFP_HIGHUSER_MOVABLE,
 		.priority = DEF_PRIORITY,
-		.may_writepage = 1,
 		.may_unmap = 1,
 		.may_swap = 1,
-		.hibernation_mode = 1,
 	};
 	struct zonelist *zonelist = node_zonelist(numa_node_id(), sc.gfp_mask);
 	struct task_struct *p = current;
 	unsigned long nr_reclaimed;
 
+	if (hibernation) {
+		sc.hibernation_mode = 1;
+		sc.may_writepage = 1;
+		sc.gfp_mask = GFP_HIGHUSER_MOVABLE;
+	} else {
+		sc.hibernation_mode = 0;
+		sc.may_writepage = !laptop_mode;
+		sc.gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_HIGHMEM;
+	}
+
 	p->flags |= PF_MEMALLOC;
 	lockdep_set_current_reclaim_state(sc.gfp_mask);
 	reclaim_state.reclaimed_slab = 0;
@@ -3442,7 +3449,7 @@ unsigned long shrink_all_memory(unsigned long nr_to_reclaim)
 
 	return nr_reclaimed;
 }
-#endif /* CONFIG_HIBERNATION */
+#endif /* CONFIG_HIBERNATION || CONFIG_CMA_AGGRESSIVE */
 
 /* It's optimal to keep kswapds on the same CPUs as their memory, but
    not required for correctness.  So if the last cpu in a node goes
-- 
1.9.1

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