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mm: simplify lock_page_memcg()

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Now that migration doesn't clear page->mem_cgroup of live pages anymore,
it's safe to make lock_page_memcg() and the memcg stat functions take
pages, and spare the callers from memcg objects.

[akpm@linux-foundation.org: fix warnings]
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Suggested-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2016-03-15 14:57:22 -07:00 • committed by Linus Torvalds
parent 6a93ca8fde
commit 62cccb8c8e
12 changed files with 88 additions and 117 deletions
Download patch file Download diff file Expand all files Collapse all files

18
fs/buffer.c
View file

@ -624,14 +624,14 @@ EXPORT_SYMBOL(mark_buffer_dirty_inode);
* The caller must hold lock_page_memcg().
*/
static void __set_page_dirty(struct page *page, struct address_space *mapping,
struct mem_cgroup *memcg, int warn)
int warn)
{
unsigned long flags;
spin_lock_irqsave(&mapping->tree_lock, flags);
if (page->mapping) { /* Race with truncate? */
WARN_ON_ONCE(warn && !PageUptodate(page));
account_page_dirtied(page, mapping, memcg);
account_page_dirtied(page, mapping);
radix_tree_tag_set(&mapping->page_tree,
page_index(page), PAGECACHE_TAG_DIRTY);
}
@ -666,7 +666,6 @@ static void __set_page_dirty(struct page *page, struct address_space *mapping,
int __set_page_dirty_buffers(struct page *page)
{
int newly_dirty;
struct mem_cgroup *memcg;
struct address_space *mapping = page_mapping(page);
if (unlikely(!mapping))
@ -686,14 +685,14 @@ int __set_page_dirty_buffers(struct page *page)
* Lock out page->mem_cgroup migration to keep PageDirty
* synchronized with per-memcg dirty page counters.
*/
memcg = lock_page_memcg(page);
lock_page_memcg(page);
newly_dirty = !TestSetPageDirty(page);
spin_unlock(&mapping->private_lock);
if (newly_dirty)
__set_page_dirty(page, mapping, memcg, 1);
__set_page_dirty(page, mapping, 1);
unlock_page_memcg(memcg);
unlock_page_memcg(page);
if (newly_dirty)
__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
@ -1167,15 +1166,14 @@ void mark_buffer_dirty(struct buffer_head *bh)
if (!test_set_buffer_dirty(bh)) {
struct page *page = bh->b_page;
struct address_space *mapping = NULL;
struct mem_cgroup *memcg;
memcg = lock_page_memcg(page);
lock_page_memcg(page);
if (!TestSetPageDirty(page)) {
mapping = page_mapping(page);
if (mapping)
__set_page_dirty(page, mapping, memcg, 0);
__set_page_dirty(page, mapping, 0);
}
unlock_page_memcg(memcg);
unlock_page_memcg(page);
if (mapping)
__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
}