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Memory controller: add per cgroup LRU and reclaim

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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
Download Patch File Download Diff File Expand all files Collapse all files

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;
}