Infrastructure to account dirty pages per cgroup + add memory.dirty_bytes limit
in cgroupfs.
Signed-off-by: Andrea Righi <ari...@develer.com>
---
include/linux/memcontrol.h | 31 ++++++
mm/memcontrol.c | 218 +++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 248 insertions(+), 1 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 1f9b119..ba3fe0d 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -25,6 +25,16 @@ struct page_cgroup;
struct page;
struct mm_struct;
+/* Cgroup memory statistics items exported to the kernel */
+enum memcg_page_stat_item {
+ MEMCG_NR_FREE_PAGES,
+ MEMCG_NR_RECLAIMABLE_PAGES,
+ MEMCG_NR_FILE_DIRTY,
+ MEMCG_NR_WRITEBACK,
+ MEMCG_NR_WRITEBACK_TEMP,
+ MEMCG_NR_UNSTABLE_NFS,
+};
+
#ifdef CONFIG_CGROUP_MEM_RES_CTLR
/*
* All "charge" functions with gfp_mask should use GFP_KERNEL or
@@ -48,6 +58,8 @@ extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup
*ptr);
extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask);
+extern void mem_cgroup_charge_dirty(struct page *page,
+ enum zone_stat_item idx, int charge);
extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru);
extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru);
extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru);
@@ -117,6 +129,10 @@ extern void mem_cgroup_print_oom_info(struct mem_cgroup
*memcg,
extern int do_swap_account;
#endif
+extern unsigned long mem_cgroup_dirty_bytes(void);
+
+extern u64 mem_cgroup_page_state(enum memcg_page_stat_item item);
+
static inline bool mem_cgroup_disabled(void)
{
if (mem_cgroup_subsys.disabled)
@@ -144,6 +160,11 @@ static inline int mem_cgroup_cache_charge(struct page
*page,
return 0;
}
+static inline void mem_cgroup_charge_dirty(struct page *page,
+ enum zone_stat_item idx, int charge)
+{
+}
+
static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)
{
@@ -312,6 +333,16 @@ unsigned long mem_cgroup_soft_limit_reclaim(struct zone
*zone, int order,
return 0;
}
+static inline unsigned long mem_cgroup_dirty_bytes(void)
+{
+ return vm_dirty_bytes;
+}
+
+static inline u64 mem_cgroup_page_state(enum memcg_page_stat_item item)
+{
+ return 0;
+}
+
#endif /* CONFIG_CGROUP_MEM_CONT */
#endif /* _LINUX_MEMCONTROL_H */
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 954032b..288b9a4 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -64,13 +64,18 @@ enum mem_cgroup_stat_index {
/*
* For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
*/
- MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */
+ MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */
MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */
MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */
MEM_CGROUP_STAT_PGPGIN_COUNT, /* # of pages paged in */
MEM_CGROUP_STAT_PGPGOUT_COUNT, /* # of pages paged out */
MEM_CGROUP_STAT_EVENTS, /* sum of pagein + pageout for internal use */
MEM_CGROUP_STAT_SWAPOUT, /* # of pages, swapped out */
+ MEM_CGROUP_STAT_FILE_DIRTY, /* # of dirty pages in page cache */
+ MEM_CGROUP_STAT_WRITEBACK, /* # of pages under writeback */
+ MEM_CGROUP_STAT_WRITEBACK_TEMP, /* # of pages under writeback using
+ temporary buffers */
+ MEM_CGROUP_STAT_UNSTABLE_NFS, /* # of NFS unstable pages */
MEM_CGROUP_STAT_NSTATS,
};
@@ -225,6 +230,9 @@ struct mem_cgroup {
/* set when res.limit == memsw.limit */
bool memsw_is_minimum;
+ /* control memory cgroup dirty pages */
+ unsigned long dirty_bytes;
+
/*
* statistics. This must be placed at the end of memcg.
*/
@@ -519,6 +527,67 @@ static void mem_cgroup_charge_statistics(struct mem_cgroup
*mem,
put_cpu();
}
+static struct mem_cgroup *get_mem_cgroup_from_page(struct page *page)
+{
+ struct page_cgroup *pc;
+ struct mem_cgroup *mem = NULL;
+
+ pc = lookup_page_cgroup(page);
+ if (unlikely(!pc))
+ return NULL;
+ lock_page_cgroup(pc);
+ if (PageCgroupUsed(pc)) {
+ mem = pc->mem_cgroup;
+ if (mem)
+ css_get(&mem->css);
+ }
+ unlock_page_cgroup(pc);
+ return mem;
+}
+
+void mem_cgroup_charge_dirty(struct page *page,
+ enum zone_stat_item idx, int charge)
+{
+ struct mem_cgroup *mem;
+ struct mem_cgroup_stat_cpu *cpustat;
+ unsigned long flags;
+ int cpu;
+
+ if (mem_cgroup_disabled())
+ return;
+ /* Translate the zone_stat_item into a mem_cgroup_stat_index */
+ switch (idx) {
+ case NR_FILE_DIRTY:
+ idx = MEM_CGROUP_STAT_FILE_DIRTY;
+ break;
+ case NR_WRITEBACK:
+ idx = MEM_CGROUP_STAT_WRITEBACK;
+ break;
+ case NR_WRITEBACK_TEMP:
+ idx = MEM_CGROUP_STAT_WRITEBACK_TEMP;
+ break;
+ case NR_UNSTABLE_NFS:
+ idx = MEM_CGROUP_STAT_UNSTABLE_NFS;
+ break;
+ default:
+ return;
+ }
+ /* Charge the memory cgroup statistics */
+ mem = get_mem_cgroup_from_page(page);
+ if (!mem) {
+ mem = root_mem_cgroup;
+ css_get(&mem->css);
+ }
+
+ local_irq_save(flags);
+ cpu = get_cpu();
+ cpustat = &mem->stat.cpustat[cpu];
+ __mem_cgroup_stat_add_safe(cpustat, idx, charge);
+ put_cpu();
+ local_irq_restore(flags);
+ css_put(&mem->css);
+}
+
static unsigned long mem_cgroup_get_local_zonestat(struct mem_cgroup *mem,
enum lru_list idx)
{
@@ -992,6 +1061,97 @@ static unsigned int get_swappiness(struct mem_cgroup
*memcg)
return swappiness;
}
+static unsigned long get_dirty_bytes(struct mem_cgroup *memcg)
+{
+ struct cgroup *cgrp = memcg->css.cgroup;
+ unsigned long dirty_bytes;
+
+ /* root ? */
+ if (cgrp->parent == NULL)
+ return vm_dirty_bytes;
+
+ spin_lock(&memcg->reclaim_param_lock);
+ dirty_bytes = memcg->dirty_bytes;
+ spin_unlock(&memcg->reclaim_param_lock);
+
+ return dirty_bytes;
+}
+
+unsigned long mem_cgroup_dirty_bytes(void)
+{
+ struct mem_cgroup *memcg;
+ unsigned long dirty_bytes;
+
+ if (mem_cgroup_disabled())
+ return vm_dirty_bytes;
+
+ rcu_read_lock();
+ memcg = mem_cgroup_from_task(current);
+ if (memcg == NULL)
+ dirty_bytes = vm_dirty_bytes;
+ else
+ dirty_bytes = get_dirty_bytes(memcg);
+ rcu_read_unlock();
+
+ return dirty_bytes;
+}
+
+u64 mem_cgroup_page_state(enum memcg_page_stat_item item)
+{
+ struct mem_cgroup *memcg;
+ struct cgroup *cgrp;
+ u64 ret = 0;
+
+ if (mem_cgroup_disabled())
+ return 0;
+
+ rcu_read_lock();
+ memcg = mem_cgroup_from_task(current);
+ if (memcg == NULL)
+ goto out;
+ cgrp = memcg->css.cgroup;
+ /* Use system-wide statistics for the root cgroup */
+ if (cgrp->parent == NULL)
+ goto out;
+ switch (item) {
+ case MEMCG_NR_FREE_PAGES:
+ ret = res_counter_read_u64(&memcg->res, RES_LIMIT) -
+ res_counter_read_u64(&memcg->res, RES_USAGE);
+ /*
+ * Translate free memory in pages and ensure we never return 0.
+ */
+ ret = (ret >> PAGE_SHIFT) + 1;
+ break;
+ case MEMCG_NR_RECLAIMABLE_PAGES:
+ ret = mem_cgroup_read_stat(&memcg->stat, LRU_ACTIVE_ANON) +
+ mem_cgroup_read_stat(&memcg->stat, LRU_ACTIVE_FILE) +
+ mem_cgroup_read_stat(&memcg->stat, LRU_INACTIVE_ANON) +
+ mem_cgroup_read_stat(&memcg->stat, LRU_INACTIVE_FILE);
+ break;
+ case MEMCG_NR_FILE_DIRTY:
+ ret = mem_cgroup_read_stat(&memcg->stat,
+ MEM_CGROUP_STAT_FILE_DIRTY);
+ break;
+ case MEMCG_NR_WRITEBACK:
+ ret = mem_cgroup_read_stat(&memcg->stat,
+ MEM_CGROUP_STAT_WRITEBACK);
+ break;
+ case MEMCG_NR_WRITEBACK_TEMP:
+ ret = mem_cgroup_read_stat(&memcg->stat,
+ MEM_CGROUP_STAT_WRITEBACK_TEMP);
+ break;
+ case MEMCG_NR_UNSTABLE_NFS:
+ ret = mem_cgroup_read_stat(&memcg->stat,
+ MEM_CGROUP_STAT_UNSTABLE_NFS);
+ break;
+ default:
+ WARN_ON(1);
+ }
+out:
+ rcu_read_unlock();
+ return ret;
+}
+
static int mem_cgroup_count_children_cb(struct mem_cgroup *mem, void *data)
{
int *val = data;
@@ -2874,6 +3034,10 @@ enum {
MCS_PGPGIN,
MCS_PGPGOUT,
MCS_SWAP,
+ MCS_FILE_DIRTY,
+ MCS_WRITEBACK,
+ MCS_WRITEBACK_TEMP,
+ MCS_UNSTABLE_NFS,
MCS_INACTIVE_ANON,
MCS_ACTIVE_ANON,
MCS_INACTIVE_FILE,
@@ -2896,6 +3060,10 @@ struct {
{"pgpgin", "total_pgpgin"},
{"pgpgout", "total_pgpgout"},
{"swap", "total_swap"},
+ {"filedirty", "dirty_pages"},
+ {"writeback", "writeback_pages"},
+ {"writeback_tmp", "writeback_temp_pages"},
+ {"nfs", "nfs_unstable"},
{"inactive_anon", "total_inactive_anon"},
{"active_anon", "total_active_anon"},
{"inactive_file", "total_inactive_file"},
@@ -2924,6 +3092,14 @@ static int mem_cgroup_get_local_stat(struct mem_cgroup
*mem, void *data)
val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_SWAPOUT);
s->stat[MCS_SWAP] += val * PAGE_SIZE;
}
+ val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_FILE_DIRTY);
+ s->stat[MCS_FILE_DIRTY] += val;
+ val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_WRITEBACK);
+ s->stat[MCS_WRITEBACK] += val;
+ val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_WRITEBACK_TEMP);
+ s->stat[MCS_WRITEBACK_TEMP] += val;
+ val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_UNSTABLE_NFS);
+ s->stat[MCS_UNSTABLE_NFS] += val;
/* per zone stat */
val = mem_cgroup_get_local_zonestat(mem, LRU_INACTIVE_ANON);
@@ -3049,6 +3225,41 @@ static int mem_cgroup_swappiness_write(struct cgroup
*cgrp, struct cftype *cft,
return 0;
}
+static u64 mem_cgroup_dirty_bytes_read(struct cgroup *cgrp, struct cftype *cft)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
+
+ return get_dirty_bytes(memcg);
+}
+
+static int mem_cgroup_dirty_bytes_write(struct cgroup *cgrp, struct cftype
*cft,
+ u64 val)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
+ struct mem_cgroup *parent;
+
+ if (cgrp->parent == NULL)
+ return -EINVAL;
+
+ parent = mem_cgroup_from_cont(cgrp->parent);
+
+ cgroup_lock();
+
+ /* If under hierarchy, only empty-root can set this value */
+ if ((parent->use_hierarchy) ||
+ (memcg->use_hierarchy && !list_empty(&cgrp->children))) {
+ cgroup_unlock();
+ return -EINVAL;
+ }
+
+ spin_lock(&memcg->reclaim_param_lock);
+ memcg->dirty_bytes = val;
+ spin_unlock(&memcg->reclaim_param_lock);
+
+ cgroup_unlock();
+
+ return 0;
+}
static struct cftype mem_cgroup_files[] = {
{
@@ -3098,6 +3309,11 @@ static struct cftype mem_cgroup_files[] = {
.read_u64 = mem_cgroup_swappiness_read,
.write_u64 = mem_cgroup_swappiness_write,
},
+ {
+ .name = "dirty_bytes",
+ .read_u64 = mem_cgroup_dirty_bytes_read,
+ .write_u64 = mem_cgroup_dirty_bytes_write,
+ },
};
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
--
1.6.3.3
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