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authorHugh Dickins <hughd@google.com>2015-11-06 05:49:40 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-06 06:34:48 +0300
commit45637bab30d6e7651737f51aa99417baef4d114a (patch)
tree6d663f1a1400d31d832c37b2ba52c5a937cce64f /mm
parent51afb12ba809db664682a31154c11e720e2c363c (diff)
downloadlinux-45637bab30d6e7651737f51aa99417baef4d114a.tar.xz
mm: rename mem_cgroup_migrate to mem_cgroup_replace_page
After v4.3's commit 0610c25daa3e ("memcg: fix dirty page migration") mem_cgroup_migrate() doesn't have much to offer in page migration: convert migrate_misplaced_transhuge_page() to set_page_memcg() instead. Then rename mem_cgroup_migrate() to mem_cgroup_replace_page(), since its remaining callers are replace_page_cache_page() and shmem_replace_page(): both of whom passed lrucare true, so just eliminate that argument. Signed-off-by: Hugh Dickins <hughd@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Rik van Riel <riel@redhat.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/filemap.c2
-rw-r--r--mm/memcontrol.c29
-rw-r--r--mm/migrate.c5
-rw-r--r--mm/shmem.c2
4 files changed, 12 insertions, 26 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 884766da1165..58e04e26f996 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -551,7 +551,7 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask)
__inc_zone_page_state(new, NR_SHMEM);
spin_unlock_irqrestore(&mapping->tree_lock, flags);
mem_cgroup_end_page_stat(memcg);
- mem_cgroup_migrate(old, new, true);
+ mem_cgroup_replace_page(old, new);
radix_tree_preload_end();
if (freepage)
freepage(old);
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c0111cb667b5..a44494f3a965 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4531,9 +4531,8 @@ static int mem_cgroup_move_account(struct page *page,
goto out;
/*
- * Prevent mem_cgroup_migrate() from looking at page->mem_cgroup
- * of its source page while we change it: page migration takes
- * both pages off the LRU, but page cache replacement doesn't.
+ * Prevent mem_cgroup_replace_page() from looking at
+ * page->mem_cgroup of its source page while we change it.
*/
if (!trylock_page(page))
goto out;
@@ -5495,7 +5494,7 @@ void mem_cgroup_uncharge_list(struct list_head *page_list)
}
/**
- * mem_cgroup_migrate - migrate a charge to another page
+ * mem_cgroup_replace_page - migrate a charge to another page
* @oldpage: currently charged page
* @newpage: page to transfer the charge to
* @lrucare: either or both pages might be on the LRU already
@@ -5504,16 +5503,13 @@ void mem_cgroup_uncharge_list(struct list_head *page_list)
*
* Both pages must be locked, @newpage->mapping must be set up.
*/
-void mem_cgroup_migrate(struct page *oldpage, struct page *newpage,
- bool lrucare)
+void mem_cgroup_replace_page(struct page *oldpage, struct page *newpage)
{
struct mem_cgroup *memcg;
int isolated;
VM_BUG_ON_PAGE(!PageLocked(oldpage), oldpage);
VM_BUG_ON_PAGE(!PageLocked(newpage), newpage);
- VM_BUG_ON_PAGE(!lrucare && PageLRU(oldpage), oldpage);
- VM_BUG_ON_PAGE(!lrucare && PageLRU(newpage), newpage);
VM_BUG_ON_PAGE(PageAnon(oldpage) != PageAnon(newpage), newpage);
VM_BUG_ON_PAGE(PageTransHuge(oldpage) != PageTransHuge(newpage),
newpage);
@@ -5525,25 +5521,16 @@ void mem_cgroup_migrate(struct page *oldpage, struct page *newpage,
if (newpage->mem_cgroup)
return;
- /*
- * Swapcache readahead pages can get migrated before being
- * charged, and migration from compaction can happen to an
- * uncharged page when the PFN walker finds a page that
- * reclaim just put back on the LRU but has not released yet.
- */
+ /* Swapcache readahead pages can get replaced before being charged */
memcg = oldpage->mem_cgroup;
if (!memcg)
return;
- if (lrucare)
- lock_page_lru(oldpage, &isolated);
-
+ lock_page_lru(oldpage, &isolated);
oldpage->mem_cgroup = NULL;
+ unlock_page_lru(oldpage, isolated);
- if (lrucare)
- unlock_page_lru(oldpage, isolated);
-
- commit_charge(newpage, memcg, lrucare);
+ commit_charge(newpage, memcg, true);
}
/*
diff --git a/mm/migrate.c b/mm/migrate.c
index ed72c499df8a..836e4108eaef 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -30,7 +30,6 @@
#include <linux/mempolicy.h>
#include <linux/vmalloc.h>
#include <linux/security.h>
-#include <linux/memcontrol.h>
#include <linux/syscalls.h>
#include <linux/hugetlb.h>
#include <linux/hugetlb_cgroup.h>
@@ -1831,8 +1830,8 @@ fail_putback:
}
mlock_migrate_page(new_page, page);
- mem_cgroup_migrate(page, new_page, false);
-
+ set_page_memcg(new_page, page_memcg(page));
+ set_page_memcg(page, NULL);
page_remove_rmap(page);
spin_unlock(ptl);
diff --git a/mm/shmem.c b/mm/shmem.c
index 48ce82926d93..6529226b3814 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1023,7 +1023,7 @@ static int shmem_replace_page(struct page **pagep, gfp_t gfp,
*/
oldpage = newpage;
} else {
- mem_cgroup_migrate(oldpage, newpage, true);
+ mem_cgroup_replace_page(oldpage, newpage);
lru_cache_add_anon(newpage);
*pagep = newpage;
}