The patch titled
Subject: page_cgroup: add helper function to get swap_cgroup
has been removed from the -mm tree. Its filename was
page_cgroup-add-helper-function-to-get-swap_cgroup.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
From: Bob Liu <lliubbo@xxxxxxxxx>
Subject: page_cgroup: add helper function to get swap_cgroup
There are multiple places which need to get the swap_cgroup address, so
add a helper function:
static struct swap_cgroup *swap_cgroup_getsc(swp_entry_t ent,
struct swap_cgroup_ctrl **ctrl);
to simplify the code.
Signed-off-by: Bob Liu <lliubbo@xxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxx>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Johannes Weiner <jweiner@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/page_cgroup.h | 4 +-
mm/memcontrol.c | 4 +-
mm/page_cgroup.c | 56 ++++++++++++----------------------
3 files changed, 24 insertions(+), 40 deletions(-)
diff -puN include/linux/page_cgroup.h~page_cgroup-add-helper-function-to-get-swap_cgroup include/linux/page_cgroup.h
--- a/include/linux/page_cgroup.h~page_cgroup-add-helper-function-to-get-swap_cgroup
+++ a/include/linux/page_cgroup.h
@@ -149,7 +149,7 @@ static inline void __init page_cgroup_in
extern unsigned short swap_cgroup_cmpxchg(swp_entry_t ent,
unsigned short old, unsigned short new);
extern unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id);
-extern unsigned short lookup_swap_cgroup(swp_entry_t ent);
+extern unsigned short lookup_swap_cgroup_id(swp_entry_t ent);
extern int swap_cgroup_swapon(int type, unsigned long max_pages);
extern void swap_cgroup_swapoff(int type);
#else
@@ -161,7 +161,7 @@ unsigned short swap_cgroup_record(swp_en
}
static inline
-unsigned short lookup_swap_cgroup(swp_entry_t ent)
+unsigned short lookup_swap_cgroup_id(swp_entry_t ent)
{
return 0;
}
diff -puN mm/memcontrol.c~page_cgroup-add-helper-function-to-get-swap_cgroup mm/memcontrol.c
--- a/mm/memcontrol.c~page_cgroup-add-helper-function-to-get-swap_cgroup
+++ a/mm/memcontrol.c
@@ -2474,7 +2474,7 @@ struct mem_cgroup *try_get_mem_cgroup_fr
memcg = NULL;
} else if (PageSwapCache(page)) {
ent.val = page_private(page);
- id = lookup_swap_cgroup(ent);
+ id = lookup_swap_cgroup_id(ent);
rcu_read_lock();
memcg = mem_cgroup_lookup(id);
if (memcg && !css_tryget(&memcg->css))
@@ -5264,7 +5264,7 @@ static int is_target_pte_for_mc(struct v
}
/* There is a swap entry and a page doesn't exist or isn't charged */
if (ent.val && !ret &&
- css_id(&mc.from->css) == lookup_swap_cgroup(ent)) {
+ css_id(&mc.from->css) == lookup_swap_cgroup_id(ent)) {
ret = MC_TARGET_SWAP;
if (target)
target->ent = ent;
diff -puN mm/page_cgroup.c~page_cgroup-add-helper-function-to-get-swap_cgroup mm/page_cgroup.c
--- a/mm/page_cgroup.c~page_cgroup-add-helper-function-to-get-swap_cgroup
+++ a/mm/page_cgroup.c
@@ -334,7 +334,6 @@ struct swap_cgroup {
unsigned short id;
};
#define SC_PER_PAGE (PAGE_SIZE/sizeof(struct swap_cgroup))
-#define SC_POS_MASK (SC_PER_PAGE - 1)
/*
* SwapCgroup implements "lookup" and "exchange" operations.
@@ -376,6 +375,21 @@ not_enough_page:
return -ENOMEM;
}
+static struct swap_cgroup *lookup_swap_cgroup(swp_entry_t ent,
+ struct swap_cgroup_ctrl **ctrlp)
+{
+ pgoff_t offset = swp_offset(ent);
+ struct swap_cgroup_ctrl *ctrl;
+ struct page *mappage;
+
+ ctrl = &swap_cgroup_ctrl[swp_type(ent)];
+ if (ctrlp)
+ *ctrlp = ctrl;
+
+ mappage = ctrl->map[offset / SC_PER_PAGE];
+ return page_address(mappage) + offset % SC_PER_PAGE;
+}
+
/**
* swap_cgroup_cmpxchg - cmpxchg mem_cgroup's id for this swp_entry.
* @end: swap entry to be cmpxchged
@@ -388,21 +402,13 @@ not_enough_page:
unsigned short swap_cgroup_cmpxchg(swp_entry_t ent,
unsigned short old, unsigned short new)
{
- int type = swp_type(ent);
- unsigned long offset = swp_offset(ent);
- unsigned long idx = offset / SC_PER_PAGE;
- unsigned long pos = offset & SC_POS_MASK;
struct swap_cgroup_ctrl *ctrl;
- struct page *mappage;
struct swap_cgroup *sc;
unsigned long flags;
unsigned short retval;
- ctrl = &swap_cgroup_ctrl[type];
+ sc = lookup_swap_cgroup(ent, &ctrl);
- mappage = ctrl->map[idx];
- sc = page_address(mappage);
- sc += pos;
spin_lock_irqsave(&ctrl->lock, flags);
retval = sc->id;
if (retval == old)
@@ -423,21 +429,13 @@ unsigned short swap_cgroup_cmpxchg(swp_e
*/
unsigned short swap_cgroup_record(swp_entry_t ent, unsigned short id)
{
- int type = swp_type(ent);
- unsigned long offset = swp_offset(ent);
- unsigned long idx = offset / SC_PER_PAGE;
- unsigned long pos = offset & SC_POS_MASK;
struct swap_cgroup_ctrl *ctrl;
- struct page *mappage;
struct swap_cgroup *sc;
unsigned short old;
unsigned long flags;
- ctrl = &swap_cgroup_ctrl[type];
+ sc = lookup_swap_cgroup(ent, &ctrl);
- mappage = ctrl->map[idx];
- sc = page_address(mappage);
- sc += pos;
spin_lock_irqsave(&ctrl->lock, flags);
old = sc->id;
sc->id = id;
@@ -447,28 +445,14 @@ unsigned short swap_cgroup_record(swp_en
}
/**
- * lookup_swap_cgroup - lookup mem_cgroup tied to swap entry
+ * lookup_swap_cgroup_id - lookup mem_cgroup id tied to swap entry
* @ent: swap entry to be looked up.
*
* Returns CSS ID of mem_cgroup at success. 0 at failure. (0 is invalid ID)
*/
-unsigned short lookup_swap_cgroup(swp_entry_t ent)
+unsigned short lookup_swap_cgroup_id(swp_entry_t ent)
{
- int type = swp_type(ent);
- unsigned long offset = swp_offset(ent);
- unsigned long idx = offset / SC_PER_PAGE;
- unsigned long pos = offset & SC_POS_MASK;
- struct swap_cgroup_ctrl *ctrl;
- struct page *mappage;
- struct swap_cgroup *sc;
- unsigned short ret;
-
- ctrl = &swap_cgroup_ctrl[type];
- mappage = ctrl->map[idx];
- sc = page_address(mappage);
- sc += pos;
- ret = sc->id;
- return ret;
+ return lookup_swap_cgroup(ent, NULL)->id;
}
int swap_cgroup_swapon(int type, unsigned long max_pages)
_
Patches currently in -mm which might be from lliubbo@xxxxxxxxx are
origin.patch
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