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mm: memcg: remove unused node/section info from pc->flags

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To find the page corresponding to a certain page_cgroup, the pc->flags
encoded the node or section ID with the base array to compare the pc
pointer to.

Now that the per-memory cgroup LRU lists link page descriptors directly,
there is no longer any code that knows the struct page_cgroup of a PFN
but not the struct page.

[hughd@google.com: remove unused node/section info from pc->flags fix]
Signed-off-by: Johannes Weiner <jweiner@redhat.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Reviewed-by: Kirill A. Shutemov <kirill@shutemov.name>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Ying Han <yinghan@google.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Hugh Dickins <hughd@google.com>
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
2012-01-12 17:18:18 -08:00
committed by Linus Torvalds
parent 925b7673cc
commit 6b208e3f6e
2 changed files with 7 additions and 85 deletions
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33
include/linux/page_cgroup.h
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@@ -121,39 +121,6 @@ static inline void move_unlock_page_cgroup(struct page_cgroup *pc,
local_irq_restore(*flags);
}
#ifdef CONFIG_SPARSEMEM
#define PCG_ARRAYID_WIDTH SECTIONS_SHIFT
#else
#define PCG_ARRAYID_WIDTH NODES_SHIFT
#endif
#if (PCG_ARRAYID_WIDTH > BITS_PER_LONG - NR_PCG_FLAGS)
#error Not enough space left in pc->flags to store page_cgroup array IDs
#endif
/* pc->flags: ARRAY-ID | FLAGS */
#define PCG_ARRAYID_MASK ((1UL << PCG_ARRAYID_WIDTH) - 1)
#define PCG_ARRAYID_OFFSET (BITS_PER_LONG - PCG_ARRAYID_WIDTH)
/*
* Zero the shift count for non-existent fields, to prevent compiler
* warnings and ensure references are optimized away.
*/
#define PCG_ARRAYID_SHIFT (PCG_ARRAYID_OFFSET * (PCG_ARRAYID_WIDTH != 0))
static inline void set_page_cgroup_array_id(struct page_cgroup *pc,
unsigned long id)
{
pc->flags &= ~(PCG_ARRAYID_MASK << PCG_ARRAYID_SHIFT);
pc->flags |= (id & PCG_ARRAYID_MASK) << PCG_ARRAYID_SHIFT;
}
static inline unsigned long page_cgroup_array_id(struct page_cgroup *pc)
{
return (pc->flags >> PCG_ARRAYID_SHIFT) & PCG_ARRAYID_MASK;
}
#else /* CONFIG_CGROUP_MEM_RES_CTLR */
struct page_cgroup;