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-rw-r--r--mm/memcontrol.c122
1 files changed, 82 insertions, 40 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 10846b9656aa..031682e7ef0c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -157,12 +157,46 @@ struct page_cgroup {
struct list_head lru; /* per cgroup LRU list */
struct page *page;
struct mem_cgroup *mem_cgroup;
- int flags;
+ unsigned long flags;
+};
+
+enum {
+ /* flags for mem_cgroup */
+ PCG_CACHE, /* charged as cache */
+ /* flags for LRU placement */
+ PCG_ACTIVE, /* page is active in this cgroup */
+ PCG_FILE, /* page is file system backed */
+ PCG_UNEVICTABLE, /* page is unevictableable */
};
-#define PAGE_CGROUP_FLAG_CACHE (0x1) /* charged as cache */
-#define PAGE_CGROUP_FLAG_ACTIVE (0x2) /* page is active in this cgroup */
-#define PAGE_CGROUP_FLAG_FILE (0x4) /* page is file system backed */
-#define PAGE_CGROUP_FLAG_UNEVICTABLE (0x8) /* page is unevictableable */
+
+#define TESTPCGFLAG(uname, lname) \
+static inline int PageCgroup##uname(struct page_cgroup *pc) \
+ { return test_bit(PCG_##lname, &pc->flags); }
+
+#define SETPCGFLAG(uname, lname) \
+static inline void SetPageCgroup##uname(struct page_cgroup *pc)\
+ { set_bit(PCG_##lname, &pc->flags); }
+
+#define CLEARPCGFLAG(uname, lname) \
+static inline void ClearPageCgroup##uname(struct page_cgroup *pc) \
+ { clear_bit(PCG_##lname, &pc->flags); }
+
+
+/* Cache flag is set only once (at allocation) */
+TESTPCGFLAG(Cache, CACHE)
+
+/* LRU management flags (from global-lru definition) */
+TESTPCGFLAG(File, FILE)
+SETPCGFLAG(File, FILE)
+CLEARPCGFLAG(File, FILE)
+
+TESTPCGFLAG(Active, ACTIVE)
+SETPCGFLAG(Active, ACTIVE)
+CLEARPCGFLAG(Active, ACTIVE)
+
+TESTPCGFLAG(Unevictable, UNEVICTABLE)
+SETPCGFLAG(Unevictable, UNEVICTABLE)
+CLEARPCGFLAG(Unevictable, UNEVICTABLE)
static int page_cgroup_nid(struct page_cgroup *pc)
{
@@ -177,15 +211,25 @@ static enum zone_type page_cgroup_zid(struct page_cgroup *pc)
enum charge_type {
MEM_CGROUP_CHARGE_TYPE_CACHE = 0,
MEM_CGROUP_CHARGE_TYPE_MAPPED,
- MEM_CGROUP_CHARGE_TYPE_FORCE, /* used by force_empty */
MEM_CGROUP_CHARGE_TYPE_SHMEM, /* used by page migration of shmem */
+ MEM_CGROUP_CHARGE_TYPE_FORCE, /* used by force_empty */
+ NR_CHARGE_TYPE,
+};
+
+static const unsigned long
+pcg_default_flags[NR_CHARGE_TYPE] = {
+ ((1 << PCG_CACHE) | (1 << PCG_FILE)),
+ ((1 << PCG_ACTIVE)),
+ ((1 << PCG_ACTIVE) | (1 << PCG_CACHE)),
+ 0,
};
/*
* Always modified under lru lock. Then, not necessary to preempt_disable()
*/
-static void mem_cgroup_charge_statistics(struct mem_cgroup *mem, int flags,
- bool charge)
+static void mem_cgroup_charge_statistics(struct mem_cgroup *mem,
+ struct page_cgroup *pc,
+ bool charge)
{
int val = (charge)? 1 : -1;
struct mem_cgroup_stat *stat = &mem->stat;
@@ -194,7 +238,7 @@ static void mem_cgroup_charge_statistics(struct mem_cgroup *mem, int flags,
VM_BUG_ON(!irqs_disabled());
cpustat = &stat->cpustat[smp_processor_id()];
- if (flags & PAGE_CGROUP_FLAG_CACHE)
+ if (PageCgroupCache(pc))
__mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_CACHE, val);
else
__mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_RSS, val);
@@ -295,18 +339,18 @@ static void __mem_cgroup_remove_list(struct mem_cgroup_per_zone *mz,
{
int lru = LRU_BASE;
- if (pc->flags & PAGE_CGROUP_FLAG_UNEVICTABLE)
+ if (PageCgroupUnevictable(pc))
lru = LRU_UNEVICTABLE;
else {
- if (pc->flags & PAGE_CGROUP_FLAG_ACTIVE)
+ if (PageCgroupActive(pc))
lru += LRU_ACTIVE;
- if (pc->flags & PAGE_CGROUP_FLAG_FILE)
+ if (PageCgroupFile(pc))
lru += LRU_FILE;
}
MEM_CGROUP_ZSTAT(mz, lru) -= 1;
- mem_cgroup_charge_statistics(pc->mem_cgroup, pc->flags, false);
+ mem_cgroup_charge_statistics(pc->mem_cgroup, pc, false);
list_del(&pc->lru);
}
@@ -315,27 +359,27 @@ static void __mem_cgroup_add_list(struct mem_cgroup_per_zone *mz,
{
int lru = LRU_BASE;
- if (pc->flags & PAGE_CGROUP_FLAG_UNEVICTABLE)
+ if (PageCgroupUnevictable(pc))
lru = LRU_UNEVICTABLE;
else {
- if (pc->flags & PAGE_CGROUP_FLAG_ACTIVE)
+ if (PageCgroupActive(pc))
lru += LRU_ACTIVE;
- if (pc->flags & PAGE_CGROUP_FLAG_FILE)
+ if (PageCgroupFile(pc))
lru += LRU_FILE;
}
MEM_CGROUP_ZSTAT(mz, lru) += 1;
list_add(&pc->lru, &mz->lists[lru]);
- mem_cgroup_charge_statistics(pc->mem_cgroup, pc->flags, true);
+ mem_cgroup_charge_statistics(pc->mem_cgroup, pc, true);
}
static void __mem_cgroup_move_lists(struct page_cgroup *pc, enum lru_list lru)
{
struct mem_cgroup_per_zone *mz = page_cgroup_zoneinfo(pc);
- int active = pc->flags & PAGE_CGROUP_FLAG_ACTIVE;
- int file = pc->flags & PAGE_CGROUP_FLAG_FILE;
- int unevictable = pc->flags & PAGE_CGROUP_FLAG_UNEVICTABLE;
+ int active = PageCgroupActive(pc);
+ int file = PageCgroupFile(pc);
+ int unevictable = PageCgroupUnevictable(pc);
enum lru_list from = unevictable ? LRU_UNEVICTABLE :
(LRU_FILE * !!file + !!active);
@@ -343,16 +387,20 @@ static void __mem_cgroup_move_lists(struct page_cgroup *pc, enum lru_list lru)
return;
MEM_CGROUP_ZSTAT(mz, from) -= 1;
-
+ /*
+ * However this is done under mz->lru_lock, another flags, which
+ * are not related to LRU, will be modified from out-of-lock.
+ * We have to use atomic set/clear flags.
+ */
if (is_unevictable_lru(lru)) {
- pc->flags &= ~PAGE_CGROUP_FLAG_ACTIVE;
- pc->flags |= PAGE_CGROUP_FLAG_UNEVICTABLE;
+ ClearPageCgroupActive(pc);
+ SetPageCgroupUnevictable(pc);
} else {
if (is_active_lru(lru))
- pc->flags |= PAGE_CGROUP_FLAG_ACTIVE;
+ SetPageCgroupActive(pc);
else
- pc->flags &= ~PAGE_CGROUP_FLAG_ACTIVE;
- pc->flags &= ~PAGE_CGROUP_FLAG_UNEVICTABLE;
+ ClearPageCgroupActive(pc);
+ ClearPageCgroupUnevictable(pc);
}
MEM_CGROUP_ZSTAT(mz, lru) += 1;
@@ -589,16 +637,7 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
* If a page is accounted as a page cache, insert to inactive list.
* If anon, insert to active list.
*/
- if (ctype == MEM_CGROUP_CHARGE_TYPE_CACHE) {
- pc->flags = PAGE_CGROUP_FLAG_CACHE;
- if (page_is_file_cache(page))
- pc->flags |= PAGE_CGROUP_FLAG_FILE;
- else
- pc->flags |= PAGE_CGROUP_FLAG_ACTIVE;
- } else if (ctype == MEM_CGROUP_CHARGE_TYPE_MAPPED)
- pc->flags = PAGE_CGROUP_FLAG_ACTIVE;
- else /* MEM_CGROUP_CHARGE_TYPE_SHMEM */
- pc->flags = PAGE_CGROUP_FLAG_CACHE | PAGE_CGROUP_FLAG_ACTIVE;
+ pc->flags = pcg_default_flags[ctype];
lock_page_cgroup(page);
if (unlikely(page_get_page_cgroup(page))) {
@@ -677,8 +716,12 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
if (unlikely(!mm))
mm = &init_mm;
- return mem_cgroup_charge_common(page, mm, gfp_mask,
+ if (page_is_file_cache(page))
+ return mem_cgroup_charge_common(page, mm, gfp_mask,
MEM_CGROUP_CHARGE_TYPE_CACHE, NULL);
+ else
+ return mem_cgroup_charge_common(page, mm, gfp_mask,
+ MEM_CGROUP_CHARGE_TYPE_SHMEM, NULL);
}
/*
@@ -706,8 +749,7 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
VM_BUG_ON(pc->page != page);
if ((ctype == MEM_CGROUP_CHARGE_TYPE_MAPPED)
- && ((pc->flags & PAGE_CGROUP_FLAG_CACHE)
- || page_mapped(page)))
+ && ((PageCgroupCache(pc) || page_mapped(page))))
goto unlock;
mz = page_cgroup_zoneinfo(pc);
@@ -758,7 +800,7 @@ int mem_cgroup_prepare_migration(struct page *page, struct page *newpage)
if (pc) {
mem = pc->mem_cgroup;
css_get(&mem->css);
- if (pc->flags & PAGE_CGROUP_FLAG_CACHE) {
+ if (PageCgroupCache(pc)) {
if (page_is_file_cache(page))
ctype = MEM_CGROUP_CHARGE_TYPE_CACHE;
else
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 13:42:51 +0000