On Fri, 1 Jul 2011 16:10:51 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:
> Sorry, this seems still buggy. I'll send a new one in the next week :(
>
tested with allnoconfig, allyesconfig, CONFIG_SWAP=y/n,
CONFIG_CGROUP_MEM_RES_CTLR=y/n
Patch is onto mmotm-0630.
==
>From 7daf93a277e19026bb6edef3e0ac01bbd31dcb5e Mon Sep 17 00:00:00 2001
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Date: Fri, 1 Jul 2011 10:35:57 +0900
Subject: [PATCH] export memory cgroup's swappines by mem_cgroup_swappiness()
Each memory cgroup has 'swappiness' value and it can be accessed by
get_swappiness(memcg). The major user is try_to_free_mem_cgroup_pages()
and swappiness is passed by argument. It's propagated by scan_control.
get_swappiness is static function but some planned updates will need to
get swappiness from files other than memcontrol.c
This patch exports get_swappiness() as mem_cgroup_swappiness().
By this, we can remove the argument of swapiness from try_to_free...
and drop swappiness from scan_control. only memcg uses it.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Changelog:
- move definistions out of CONFIG_SWAP.
- fixed/tested allyesconfig/allnoconfig compile failure.
- adjusted signedness to vm_swappiness.
- drop swappiness from scan_control
---
include/linux/swap.h | 13 +++++++++----
mm/memcontrol.c | 15 +++++++--------
mm/vmscan.c | 23 ++++++++++-------------
3 files changed, 26 insertions(+), 25 deletions(-)
Index: mmotm-0701/include/linux/swap.h
===================================================================
--- mmotm-0701.orig/include/linux/swap.h
+++ mmotm-0701/include/linux/swap.h
@@ -254,11 +254,9 @@ static inline void lru_cache_add_file(st
extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
gfp_t gfp_mask, nodemask_t *mask);
extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem,
- gfp_t gfp_mask, bool noswap,
- unsigned int swappiness);
+ gfp_t gfp_mask, bool noswap);
extern unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
gfp_t gfp_mask, bool noswap,
- unsigned int swappiness,
struct zone *zone,
unsigned long *nr_scanned);
extern int __isolate_lru_page(struct page *page, int mode, int file);
@@ -301,7 +299,14 @@ static inline void scan_unevictable_unre
extern int kswapd_run(int nid);
extern void kswapd_stop(int nid);
-
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+extern int mem_cgroup_swappiness(struct mem_cgroup *mem);
+#else
+static inline int mem_cgroup_swappiness(struct mem_cgroup *mem)
+{
+ return vm_swappiness;
+}
+#endif
#ifdef CONFIG_SWAP
/* linux/mm/page_io.c */
extern int swap_readpage(struct page *);
Index: mmotm-0701/mm/memcontrol.c
===================================================================
--- mmotm-0701.orig/mm/memcontrol.c
+++ mmotm-0701/mm/memcontrol.c
@@ -248,7 +248,7 @@ struct mem_cgroup {
atomic_t oom_lock;
atomic_t refcnt;
- unsigned int swappiness;
+ int swappiness;
/* OOM-Killer disable */
int oom_kill_disable;
@@ -1328,7 +1328,7 @@ static unsigned long mem_cgroup_margin(s
return margin >> PAGE_SHIFT;
}
-static unsigned int get_swappiness(struct mem_cgroup *memcg)
+int mem_cgroup_swappiness(struct mem_cgroup *memcg)
{
struct cgroup *cgrp = memcg->css.cgroup;
@@ -1775,12 +1775,11 @@ static int mem_cgroup_hierarchical_recla
/* we use swappiness of local cgroup */
if (check_soft) {
ret = mem_cgroup_shrink_node_zone(victim, gfp_mask,
- noswap, get_swappiness(victim), zone,
- &nr_scanned);
+ noswap, zone, &nr_scanned);
*total_scanned += nr_scanned;
} else
ret = try_to_free_mem_cgroup_pages(victim, gfp_mask,
- noswap, get_swappiness(victim));
+ noswap);
css_put(&victim->css);
/*
* At shrinking usage, we can't check we should stop here or
@@ -3776,7 +3775,7 @@ try_to_free:
goto out;
}
progress = try_to_free_mem_cgroup_pages(mem, GFP_KERNEL,
- false, get_swappiness(mem));
+ false);
if (!progress) {
nr_retries--;
/* maybe some writeback is necessary */
@@ -4238,7 +4237,7 @@ static u64 mem_cgroup_swappiness_read(st
{
struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
- return get_swappiness(memcg);
+ return mem_cgroup_swappiness(memcg);
}
static int mem_cgroup_swappiness_write(struct cgroup *cgrp, struct cftype *cft,
@@ -4947,7 +4946,7 @@ mem_cgroup_create(struct cgroup_subsys *
INIT_LIST_HEAD(&mem->oom_notify);
if (parent)
- mem->swappiness = get_swappiness(parent);
+ mem->swappiness = mem_cgroup_swappiness(parent);
atomic_set(&mem->refcnt, 1);
mem->move_charge_at_immigrate = 0;
mutex_init(&mem->thresholds_lock);
Index: mmotm-0701/mm/vmscan.c
===================================================================
--- mmotm-0701.orig/mm/vmscan.c
+++ mmotm-0701/mm/vmscan.c
@@ -95,8 +95,6 @@ struct scan_control {
/* Can pages be swapped as part of reclaim? */
int may_swap;
- int swappiness;
-
int order;
/*
@@ -1729,6 +1727,13 @@ static unsigned long shrink_list(enum lr
return shrink_inactive_list(nr_to_scan, zone, sc, priority, file);
}
+static int vmscan_swappiness(struct scan_control *sc)
+{
+ if (scanning_global_lru(sc))
+ return vm_swappiness;
+ return mem_cgroup_swappiness(sc->mem_cgroup);
+}
+
/*
* Determine how aggressively the anon and file LRU lists should be
* scanned. The relative value of each set of LRU lists is determined
@@ -1789,8 +1794,8 @@ static void get_scan_count(struct zone *
* With swappiness at 100, anonymous and file have the same priority.
* This scanning priority is essentially the inverse of IO cost.
*/
- anon_prio = sc->swappiness;
- file_prio = 200 - sc->swappiness;
+ anon_prio = vmscan_swappiness(sc);
+ file_prio = 200 - vmscan_swappiness(sc);
/*
* OK, so we have swap space and a fair amount of page cache
@@ -2179,7 +2184,6 @@ unsigned long try_to_free_pages(struct z
.nr_to_reclaim = SWAP_CLUSTER_MAX,
.may_unmap = 1,
.may_swap = 1,
- .swappiness = vm_swappiness,
.order = order,
.mem_cgroup = NULL,
.nodemask = nodemask,
@@ -2203,7 +2207,6 @@ unsigned long try_to_free_pages(struct z
unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
gfp_t gfp_mask, bool noswap,
- unsigned int swappiness,
struct zone *zone,
unsigned long *nr_scanned)
{
@@ -2213,7 +2216,6 @@ unsigned long mem_cgroup_shrink_node_zon
.may_writepage = !laptop_mode,
.may_unmap = 1,
.may_swap = !noswap,
- .swappiness = swappiness,
.order = 0,
.mem_cgroup = mem,
};
@@ -2242,8 +2244,7 @@ unsigned long mem_cgroup_shrink_node_zon
unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
gfp_t gfp_mask,
- bool noswap,
- unsigned int swappiness)
+ bool noswap)
{
struct zonelist *zonelist;
unsigned long nr_reclaimed;
@@ -2253,7 +2254,6 @@ unsigned long try_to_free_mem_cgroup_pag
.may_unmap = 1,
.may_swap = !noswap,
.nr_to_reclaim = SWAP_CLUSTER_MAX,
- .swappiness = swappiness,
.order = 0,
.mem_cgroup = mem_cont,
.nodemask = NULL, /* we don't care the placement */
@@ -2403,7 +2403,6 @@ static unsigned long balance_pgdat(pg_da
* we want to put equal scanning pressure on each zone.
*/
.nr_to_reclaim = ULONG_MAX,
- .swappiness = vm_swappiness,
.order = order,
.mem_cgroup = NULL,
};
@@ -2873,7 +2872,6 @@ unsigned long shrink_all_memory(unsigned
.may_writepage = 1,
.nr_to_reclaim = nr_to_reclaim,
.hibernation_mode = 1,
- .swappiness = vm_swappiness,
.order = 0,
};
struct shrink_control shrink = {
@@ -3060,7 +3058,6 @@ static int __zone_reclaim(struct zone *z
.nr_to_reclaim = max_t(unsigned long, nr_pages,
SWAP_CLUSTER_MAX),
.gfp_mask = gfp_mask,
- .swappiness = vm_swappiness,
.order = order,
};
struct shrink_control shrink = {
--
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