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Memory controller: add per cgroup LRU and reclaim

Browse source 
Add the page_cgroup to the per cgroup LRU.  The reclaim algorithm has
been modified to make the isolate_lru_pages() as a pluggable component.  The
scan_control data structure now accepts the cgroup on behalf of which
reclaims are carried out.  try_to_free_pages() has been extended to become
cgroup aware.

[akpm@linux-foundation.org: fix warning]
[Lee.Schermerhorn@hp.com: initialize all scan_control's isolate_pages member]
[bunk@kernel.org: make do_try_to_free_pages() static]
[hugh@veritas.com: memcgroup: fix try_to_free order]
[kamezawa.hiroyu@jp.fujitsu.com: this unlock_page_cgroup() is unnecessary]
Signed-off-by: Pavel Emelianov <xemul@openvz.org>
Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Paul Menage <menage@google.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Kirill Korotaev <dev@sw.ru>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: David Rientjes <rientjes@google.com>
Cc: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Balbir Singh 2008-02-07 00:13:56 -08:00 committed by Linus Torvalds
parent 67e465a77b
commit 66e1707bc3
6 changed files with 286 additions and 30 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
include/linux/memcontrol.h
View file

@ -32,6 +32,13 @@ extern void page_assign_page_cgroup(struct page *page,
extern struct page_cgroup *page_get_page_cgroup(struct page *page);
extern int mem_cgroup_charge(struct page *page, struct mm_struct *mm);
extern void mem_cgroup_uncharge(struct page_cgroup *pc);
extern void mem_cgroup_move_lists(struct page_cgroup *pc, bool active);
extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
struct list_head *dst,
unsigned long *scanned, int order,
int mode, struct zone *z,
struct mem_cgroup *mem_cont,
int active);
static inline void mem_cgroup_uncharge_page(struct page *page)
{
@ -71,6 +78,11 @@ static inline void mem_cgroup_uncharge_page(struct page *page)
{
}
static inline void mem_cgroup_move_lists(struct page_cgroup *pc,
bool active)
{
}
#endif /* CONFIG_CGROUP_MEM_CONT */
#endif /* _LINUX_MEMCONTROL_H */

23
include/linux/res_counter.h
View file

@ -99,4 +99,27 @@ int res_counter_charge(struct res_counter *counter, unsigned long val);
void res_counter_uncharge_locked(struct res_counter *counter, unsigned long val);
void res_counter_uncharge(struct res_counter *counter, unsigned long val);
static inline bool res_counter_limit_check_locked(struct res_counter *cnt)
{
if (cnt->usage < cnt->limit)
return true;
return false;
}
/*
* Helper function to detect if the cgroup is within it's limit or
* not. It's currently called from cgroup_rss_prepare()
*/
static inline bool res_counter_check_under_limit(struct res_counter *cnt)
{
bool ret;
unsigned long flags;
spin_lock_irqsave(&cnt->lock, flags);
ret = res_counter_limit_check_locked(cnt);
spin_unlock_irqrestore(&cnt->lock, flags);
return ret;
}
#endif

3
include/linux/swap.h
View file

@ -5,6 +5,7 @@
#include <linux/linkage.h>
#include <linux/mmzone.h>
#include <linux/list.h>
#include <linux/memcontrol.h>
#include <linux/sched.h>
#include <asm/atomic.h>
@ -182,6 +183,8 @@ extern void swap_setup(void);
/* linux/mm/vmscan.c */
extern unsigned long try_to_free_pages(struct zone **zones, int order,
gfp_t gfp_mask);
extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem);
extern int __isolate_lru_page(struct page *page, int mode);
extern unsigned long shrink_all_memory(unsigned long nr_pages);
extern int vm_swappiness;
extern int remove_mapping(struct address_space *mapping, struct page *page);

148
mm/memcontrol.c
View file

@ -22,10 +22,15 @@
#include <linux/cgroup.h>
#include <linux/mm.h>
#include <linux/page-flags.h>
#include <linux/backing-dev.h>
#include <linux/bit_spinlock.h>
#include <linux/rcupdate.h>
#include <linux/swap.h>
#include <linux/spinlock.h>
#include <linux/fs.h>
struct cgroup_subsys mem_cgroup_subsys;
static const int MEM_CGROUP_RECLAIM_RETRIES = 5;
/*
* The memory controller data structure. The memory controller controls both
@ -51,6 +56,10 @@ struct mem_cgroup {
*/
struct list_head active_list;
struct list_head inactive_list;
/*
* spin_lock to protect the per cgroup LRU
*/
spinlock_t lru_lock;
};
/*
@ -141,6 +150,94 @@ void __always_inline unlock_page_cgroup(struct page *page)
bit_spin_unlock(PAGE_CGROUP_LOCK_BIT, &page->page_cgroup);
}
void __mem_cgroup_move_lists(struct page_cgroup *pc, bool active)
{
if (active)
list_move(&pc->lru, &pc->mem_cgroup->active_list);
else
list_move(&pc->lru, &pc->mem_cgroup->inactive_list);
}
/*
* This routine assumes that the appropriate zone's lru lock is already held
*/
void mem_cgroup_move_lists(struct page_cgroup *pc, bool active)
{
struct mem_cgroup *mem;
if (!pc)
return;
mem = pc->mem_cgroup;
spin_lock(&mem->lru_lock);
__mem_cgroup_move_lists(pc, active);
spin_unlock(&mem->lru_lock);
}
unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
struct list_head *dst,
unsigned long *scanned, int order,
int mode, struct zone *z,
struct mem_cgroup *mem_cont,
int active)
{
unsigned long nr_taken = 0;
struct page *page;
unsigned long scan;
LIST_HEAD(pc_list);
struct list_head *src;
struct page_cgroup *pc;
if (active)
src = &mem_cont->active_list;
else
src = &mem_cont->inactive_list;
spin_lock(&mem_cont->lru_lock);
for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) {
pc = list_entry(src->prev, struct page_cgroup, lru);
page = pc->page;
VM_BUG_ON(!pc);
if (PageActive(page) && !active) {
__mem_cgroup_move_lists(pc, true);
scan--;
continue;
}
if (!PageActive(page) && active) {
__mem_cgroup_move_lists(pc, false);
scan--;
continue;
}
/*
* Reclaim, per zone
* TODO: make the active/inactive lists per zone
*/
if (page_zone(page) != z)
continue;
/*
* Check if the meta page went away from under us
*/
if (!list_empty(&pc->lru))
list_move(&pc->lru, &pc_list);
else
continue;
if (__isolate_lru_page(page, mode) == 0) {
list_move(&page->lru, dst);
nr_taken++;
}
}
list_splice(&pc_list, src);
spin_unlock(&mem_cont->lru_lock);
*scanned = scan;
return nr_taken;
}
/*
* Charge the memory controller for page usage.
* Return
@ -151,6 +248,8 @@ int mem_cgroup_charge(struct page *page, struct mm_struct *mm)
{
struct mem_cgroup *mem;
struct page_cgroup *pc, *race_pc;
unsigned long flags;
unsigned long nr_retries = MEM_CGROUP_RECLAIM_RETRIES;
/*
* Should page_cgroup's go to their own slab?
@ -159,14 +258,20 @@ int mem_cgroup_charge(struct page *page, struct mm_struct *mm)
* to see if the cgroup page already has a page_cgroup associated
* with it
*/
retry:
lock_page_cgroup(page);
pc = page_get_page_cgroup(page);
/*
* The page_cgroup exists and the page has already been accounted
*/
if (pc) {
atomic_inc(&pc->ref_cnt);
goto done;
if (unlikely(!atomic_inc_not_zero(&pc->ref_cnt))) {
/* this page is under being uncharged ? */
unlock_page_cgroup(page);
cpu_relax();
goto retry;
} else
goto done;
}
unlock_page_cgroup(page);
@ -197,7 +302,32 @@ int mem_cgroup_charge(struct page *page, struct mm_struct *mm)
* If we created the page_cgroup, we should free it on exceeding
* the cgroup limit.
*/
if (res_counter_charge(&mem->res, 1)) {
while (res_counter_charge(&mem->res, 1)) {
if (try_to_free_mem_cgroup_pages(mem))
continue;
/*
* try_to_free_mem_cgroup_pages() might not give us a full
* picture of reclaim. Some pages are reclaimed and might be
* moved to swap cache or just unmapped from the cgroup.
* Check the limit again to see if the reclaim reduced the
* current usage of the cgroup before giving up
*/
if (res_counter_check_under_limit(&mem->res))
continue;
/*
* Since we control both RSS and cache, we end up with a
* very interesting scenario where we end up reclaiming
* memory (essentially RSS), since the memory is pushed
* to swap cache, we eventually end up adding those
* pages back to our list. Hence we give ourselves a
* few chances before we fail
*/
else if (nr_retries--) {
congestion_wait(WRITE, HZ/10);
continue;
}
css_put(&mem->css);
goto free_pc;
}
@ -221,14 +351,16 @@ int mem_cgroup_charge(struct page *page, struct mm_struct *mm)
pc->page = page;
page_assign_page_cgroup(page, pc);
spin_lock_irqsave(&mem->lru_lock, flags);
list_add(&pc->lru, &mem->active_list);
spin_unlock_irqrestore(&mem->lru_lock, flags);
done:
unlock_page_cgroup(page);
return 0;
free_pc:
kfree(pc);
return -ENOMEM;
err:
unlock_page_cgroup(page);
return -ENOMEM;
}
@ -240,6 +372,7 @@ void mem_cgroup_uncharge(struct page_cgroup *pc)
{
struct mem_cgroup *mem;
struct page *page;
unsigned long flags;
if (!pc)
return;
@ -252,6 +385,10 @@ void mem_cgroup_uncharge(struct page_cgroup *pc)
page_assign_page_cgroup(page, NULL);
unlock_page_cgroup(page);
res_counter_uncharge(&mem->res, 1);
spin_lock_irqsave(&mem->lru_lock, flags);
list_del_init(&pc->lru);
spin_unlock_irqrestore(&mem->lru_lock, flags);
kfree(pc);
}
}
@ -310,6 +447,7 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
res_counter_init(&mem->res);
INIT_LIST_HEAD(&mem->active_list);
INIT_LIST_HEAD(&mem->inactive_list);
spin_lock_init(&mem->lru_lock);
return &mem->css;
}

2
mm/swap.c
View file

@ -29,6 +29,7 @@
#include <linux/cpu.h>
#include <linux/notifier.h>
#include <linux/backing-dev.h>
#include <linux/memcontrol.h>
/* How many pages do we try to swap or page in/out together? */
int page_cluster;
@ -175,6 +176,7 @@ void activate_page(struct page *page)
SetPageActive(page);
add_page_to_active_list(zone, page);
__count_vm_event(PGACTIVATE);
mem_cgroup_move_lists(page_get_page_cgroup(page), true);
}
spin_unlock_irq(&zone->lru_lock);
}

128
mm/vmscan.c
View file

@ -37,6 +37,7 @@
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/memcontrol.h>
#include <asm/tlbflush.h>
#include <asm/div64.h>
@ -68,6 +69,15 @@ struct scan_control {
int all_unreclaimable;
int order;
/* Which cgroup do we reclaim from */
struct mem_cgroup *mem_cgroup;
/* Pluggable isolate pages callback */
unsigned long (*isolate_pages)(unsigned long nr, struct list_head *dst,
unsigned long *scanned, int order, int mode,
struct zone *z, struct mem_cgroup *mem_cont,
int active);
};
#define lru_to_page(_head) (list_entry((_head)->prev, struct page, lru))
@ -626,7 +636,7 @@ keep:
*
* returns 0 on success, -ve errno on failure.
*/
static int __isolate_lru_page(struct page *page, int mode)
int __isolate_lru_page(struct page *page, int mode)
{
int ret = -EINVAL;
@ -760,6 +770,21 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
return nr_taken;
}
static unsigned long isolate_pages_global(unsigned long nr,
struct list_head *dst,
unsigned long *scanned, int order,
int mode, struct zone *z,
struct mem_cgroup *mem_cont,
int active)
{
if (active)
return isolate_lru_pages(nr, &z->active_list, dst,
scanned, order, mode);
else
return isolate_lru_pages(nr, &z->inactive_list, dst,
scanned, order, mode);
}
/*
* clear_active_flags() is a helper for shrink_active_list(), clearing
* any active bits from the pages in the list.
@ -801,11 +826,11 @@ static unsigned long shrink_inactive_list(unsigned long max_scan,
unsigned long nr_freed;
unsigned long nr_active;
nr_taken = isolate_lru_pages(sc->swap_cluster_max,
&zone->inactive_list,
nr_taken = sc->isolate_pages(sc->swap_cluster_max,
&page_list, &nr_scan, sc->order,
(sc->order > PAGE_ALLOC_COSTLY_ORDER)?
ISOLATE_BOTH : ISOLATE_INACTIVE);
ISOLATE_BOTH : ISOLATE_INACTIVE,
zone, sc->mem_cgroup, 0);
nr_active = clear_active_flags(&page_list);
__count_vm_events(PGDEACTIVATE, nr_active);
@ -1018,8 +1043,9 @@ force_reclaim_mapped:
lru_add_drain();
spin_lock_irq(&zone->lru_lock);
pgmoved = isolate_lru_pages(nr_pages, &zone->active_list,
&l_hold, &pgscanned, sc->order, ISOLATE_ACTIVE);
pgmoved = sc->isolate_pages(nr_pages, &l_hold, &pgscanned, sc->order,
ISOLATE_ACTIVE, zone,
sc->mem_cgroup, 1);
zone->pages_scanned += pgscanned;
__mod_zone_page_state(zone, NR_ACTIVE, -pgmoved);
spin_unlock_irq(&zone->lru_lock);
@ -1051,6 +1077,7 @@ force_reclaim_mapped:
ClearPageActive(page);
list_move(&page->lru, &zone->inactive_list);
mem_cgroup_move_lists(page_get_page_cgroup(page), false);
pgmoved++;
if (!pagevec_add(&pvec, page)) {
__mod_zone_page_state(zone, NR_INACTIVE, pgmoved);
@ -1079,6 +1106,7 @@ force_reclaim_mapped:
SetPageLRU(page);
VM_BUG_ON(!PageActive(page));
list_move(&page->lru, &zone->active_list);
mem_cgroup_move_lists(page_get_page_cgroup(page), true);
pgmoved++;
if (!pagevec_add(&pvec, page)) {
__mod_zone_page_state(zone, NR_ACTIVE, pgmoved);
@ -1206,7 +1234,8 @@ static unsigned long shrink_zones(int priority, struct zone **zones,
* holds filesystem locks which prevent writeout this might not work, and the
* allocation attempt will fail.
*/
unsigned long try_to_free_pages(struct zone **zones, int order, gfp_t gfp_mask)
static unsigned long do_try_to_free_pages(struct zone **zones, gfp_t gfp_mask,
struct scan_control *sc)
{
int priority;
int ret = 0;
@ -1215,14 +1244,6 @@ unsigned long try_to_free_pages(struct zone **zones, int order, gfp_t gfp_mask)
struct reclaim_state *reclaim_state = current->reclaim_state;
unsigned long lru_pages = 0;
int i;
struct scan_control sc = {
.gfp_mask = gfp_mask,
.may_writepage = !laptop_mode,
.swap_cluster_max = SWAP_CLUSTER_MAX,
.may_swap = 1,
.swappiness = vm_swappiness,
.order = order,
};
count_vm_event(ALLOCSTALL);
@ -1237,17 +1258,22 @@ unsigned long try_to_free_pages(struct zone **zones, int order, gfp_t gfp_mask)
}
for (priority = DEF_PRIORITY; priority >= 0; priority--) {
sc.nr_scanned = 0;
sc->nr_scanned = 0;
if (!priority)
disable_swap_token();
nr_reclaimed += shrink_zones(priority, zones, &sc);
shrink_slab(sc.nr_scanned, gfp_mask, lru_pages);
nr_reclaimed += shrink_zones(priority, zones, sc);
/*
* Don't shrink slabs when reclaiming memory from
* over limit cgroups
*/
if (sc->mem_cgroup == NULL)
shrink_slab(sc->nr_scanned, gfp_mask, lru_pages);
if (reclaim_state) {
nr_reclaimed += reclaim_state->reclaimed_slab;
reclaim_state->reclaimed_slab = 0;
}
total_scanned += sc.nr_scanned;
if (nr_reclaimed >= sc.swap_cluster_max) {
total_scanned += sc->nr_scanned;
if (nr_reclaimed >= sc->swap_cluster_max) {
ret = 1;
goto out;
}
@ -1259,18 +1285,18 @@ unsigned long try_to_free_pages(struct zone **zones, int order, gfp_t gfp_mask)
* that's undesirable in laptop mode, where we *want* lumpy
* writeout. So in laptop mode, write out the whole world.
*/
if (total_scanned > sc.swap_cluster_max +
sc.swap_cluster_max / 2) {
if (total_scanned > sc->swap_cluster_max +
sc->swap_cluster_max / 2) {
wakeup_pdflush(laptop_mode ? 0 : total_scanned);
sc.may_writepage = 1;
sc->may_writepage = 1;
}
/* Take a nap, wait for some writeback to complete */
if (sc.nr_scanned && priority < DEF_PRIORITY - 2)
if (sc->nr_scanned && priority < DEF_PRIORITY - 2)
congestion_wait(WRITE, HZ/10);
}
/* top priority shrink_caches still had more to do? don't OOM, then */
if (!sc.all_unreclaimable)
if (!sc->all_unreclaimable && sc->mem_cgroup == NULL)
ret = 1;
out:
/*
@ -1293,6 +1319,54 @@ out:
return ret;
}
unsigned long try_to_free_pages(struct zone **zones, int order, gfp_t gfp_mask)
{
struct scan_control sc = {
.gfp_mask = gfp_mask,
.may_writepage = !laptop_mode,
.swap_cluster_max = SWAP_CLUSTER_MAX,
.may_swap = 1,
.swappiness = vm_swappiness,
.order = order,
.mem_cgroup = NULL,
.isolate_pages = isolate_pages_global,
};
return do_try_to_free_pages(zones, gfp_mask, &sc);
}
#ifdef CONFIG_CGROUP_MEM_CONT
#ifdef CONFIG_HIGHMEM
#define ZONE_USERPAGES ZONE_HIGHMEM
#else
#define ZONE_USERPAGES ZONE_NORMAL
#endif
unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont)
{
struct scan_control sc = {
.gfp_mask = GFP_KERNEL,
.may_writepage = !laptop_mode,
.may_swap = 1,
.swap_cluster_max = SWAP_CLUSTER_MAX,
.swappiness = vm_swappiness,
.order = 0,
.mem_cgroup = mem_cont,
.isolate_pages = mem_cgroup_isolate_pages,
};
int node;
struct zone **zones;
for_each_online_node(node) {
zones = NODE_DATA(node)->node_zonelists[ZONE_USERPAGES].zones;
if (do_try_to_free_pages(zones, sc.gfp_mask, &sc))
return 1;
}
return 0;
}
#endif
/*
* For kswapd, balance_pgdat() will work across all this node's zones until
* they are all at pages_high.
@ -1328,6 +1402,8 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order)
.swap_cluster_max = SWAP_CLUSTER_MAX,
.swappiness = vm_swappiness,
.order = order,
.mem_cgroup = NULL,
.isolate_pages = isolate_pages_global,
};
/*
* temp_priority is used to remember the scanning priority at which
@ -1649,6 +1725,7 @@ unsigned long shrink_all_memory(unsigned long nr_pages)
.swap_cluster_max = nr_pages,
.may_writepage = 1,
.swappiness = vm_swappiness,
.isolate_pages = isolate_pages_global,
};
current->reclaim_state = &reclaim_state;
@ -1834,6 +1911,7 @@ static int __zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
SWAP_CLUSTER_MAX),
.gfp_mask = gfp_mask,
.swappiness = vm_swappiness,
.isolate_pages = isolate_pages_global,
};
unsigned long slab_reclaimable;