The patch titled
memcg: export memory cgroup's swappiness
has been added to the -mm tree. Its filename is
memcg-export-memory-cgroups-swappiness.patch
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------------------------------------------------------
Subject: memcg: export memory cgroup's swappiness
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Each memory cgroup has a 'swappiness' value whcih 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 a 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(). With 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>
Reviewed-by: Michal Hocko <mhocko@xxxxxxx>
Acked-by: Balbir Singh <bsingharora@xxxxxxxxx>
Cc: Ying Han <yinghan@xxxxxxxxxx>
Cc: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/swap.h | 10 +++++++---
mm/memcontrol.c | 13 ++++++-------
mm/vmscan.c | 23 ++++++++++-------------
3 files changed, 23 insertions(+), 23 deletions(-)
diff -puN include/linux/swap.h~memcg-export-memory-cgroups-swappiness include/linux/swap.h
--- a/include/linux/swap.h~memcg-export-memory-cgroups-swappiness
+++ a/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);
@@ -367,11 +365,17 @@ static inline void put_swap_token(struct
extern void
mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout);
extern int mem_cgroup_count_swap_user(swp_entry_t ent, struct page **pagep);
+extern unsigned int mem_cgroup_swappiness(struct mem_cgroup *mem);
#else
static inline void
mem_cgroup_uncharge_swapcache(struct page *page, swp_entry_t ent, bool swapout)
{
}
+
+static inline unsigned int mem_cgroup_swappiness(struct mem_cgroup *mem)
+{
+ return vm_swappiness;
+}
#endif
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
extern void mem_cgroup_uncharge_swap(swp_entry_t ent);
diff -puN mm/memcontrol.c~memcg-export-memory-cgroups-swappiness mm/memcontrol.c
--- a/mm/memcontrol.c~memcg-export-memory-cgroups-swappiness
+++ a/mm/memcontrol.c
@@ -1329,7 +1329,7 @@ static unsigned long mem_cgroup_margin(s
return margin >> PAGE_SHIFT;
}
-static unsigned int get_swappiness(struct mem_cgroup *memcg)
+unsigned int mem_cgroup_swappiness(struct mem_cgroup *memcg)
{
struct cgroup *cgrp = memcg->css.cgroup;
@@ -1776,12 +1776,11 @@ 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
@@ -3777,7 +3776,7 @@ 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 */
@@ -4239,7 +4238,7 @@ 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,
@@ -4948,7 +4947,7 @@ 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);
diff -puN mm/vmscan.c~memcg-export-memory-cgroups-swappiness mm/vmscan.c
--- a/mm/vmscan.c~memcg-export-memory-cgroups-swappiness
+++ a/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 = {
_
Patches currently in -mm which might be from kamezawa.hiroyu@xxxxxxxxxxxxxx are
memcg-fix-reclaimable-lru-check-in-memcg.patch
memcg-fix-reclaimable-lru-check-in-memcg-checkpatch-fixes.patch
memcg-fix-reclaimable-lru-check-in-memcg-fix.patch
memcg-fix-numa-scan-information-update-to-be-triggered-by-memory-event.patch
memcg-fix-numa-scan-information-update-to-be-triggered-by-memory-event-fix.patch
mm-preallocate-page-before-lock_page-at-filemap-cow.patch
mm-preallocate-page-before-lock_page-at-filemap-cow-fix.patch
mm-page_cgroupc-simplify-code-by-using-section_align_up-and-section_align_down-macros.patch
memcg-export-memory-cgroups-swappiness.patch
memcg-do-not-expose-uninitialized-mem_cgroup_per_node-to-world.patch
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