[RFC][preview][patch 2/2] memcg: uncharge at truncate/unmap in batched manner

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

This patch adds hook to start batched uncharge into
  - unmap
  - truncate

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
Index: linux-2.6.31-rc7/mm/memory.c
===================================================================
--- linux-2.6.31-rc7.orig/mm/memory.c
+++ linux-2.6.31-rc7/mm/memory.c
@@ -907,6 +907,7 @@ static unsigned long unmap_page_range(st
 		details = NULL;
 
 	BUG_ON(addr >= end);
+	mem_cgroup_uncharge_batch_start();
 	tlb_start_vma(tlb, vma);
 	pgd = pgd_offset(vma->vm_mm, addr);
 	do {
@@ -919,6 +920,7 @@ static unsigned long unmap_page_range(st
 						zap_work, details);
 	} while (pgd++, addr = next, (addr != end && *zap_work > 0));
 	tlb_end_vma(tlb, vma);
+	mem_cgroup_uncharge_batch_end();
 
 	return addr;
 }
Index: linux-2.6.31-rc7/mm/truncate.c
===================================================================
--- linux-2.6.31-rc7.orig/mm/truncate.c
+++ linux-2.6.31-rc7/mm/truncate.c
@@ -231,6 +231,7 @@ void truncate_inode_pages_range(struct a
 			pagevec_release(&pvec);
 			break;
 		}
+		mem_cgroup_uncharge_batch_start();
 		for (i = 0; i < pagevec_count(&pvec); i++) {
 			struct page *page = pvec.pages[i];
 
@@ -250,6 +251,7 @@ void truncate_inode_pages_range(struct a
 			unlock_page(page);
 		}
 		pagevec_release(&pvec);
+		mem_cgroup_uncharge_batch_end();
 	}
 }
 EXPORT_SYMBOL(truncate_inode_pages_range);
@@ -291,6 +293,7 @@ unsigned long invalidate_mapping_pages(s
 	pagevec_init(&pvec, 0);
 	while (next <= end &&
 			pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
+		mem_cgroup_uncharge_batch_start();
 		for (i = 0; i < pagevec_count(&pvec); i++) {
 			struct page *page = pvec.pages[i];
 			pgoff_t index;
@@ -322,6 +325,7 @@ unlock:
 				break;
 		}
 		pagevec_release(&pvec);
+		mem_cgroup_uncharge_batch_end();
 		cond_resched();
 	}
 	return ret;
@@ -396,6 +400,7 @@ int invalidate_inode_pages2_range(struct
 	while (next <= end && !wrapped &&
 		pagevec_lookup(&pvec, mapping, next,
 			min(end - next, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) {
+		mem_cgroup_uncharge_batch_start();
 		for (i = 0; i < pagevec_count(&pvec); i++) {
 			struct page *page = pvec.pages[i];
 			pgoff_t page_index;
@@ -445,6 +450,7 @@ int invalidate_inode_pages2_range(struct
 			unlock_page(page);
 		}
 		pagevec_release(&pvec);
+		mem_cgroup_uncharge_batch_end();
 		cond_resched();
 	}
 	return ret;

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