diff options
| -rw-r--r-- | mm/memcontrol.c | 184 |
1 files changed, 63 insertions, 121 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index a82464b..9c9dfcf 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -89,54 +89,8 @@ enum mem_cgroup_stat_index { struct mem_cgroup_stat_cpu { s64 count[MEM_CGROUP_STAT_NSTATS]; -} ____cacheline_aligned_in_smp; - -struct mem_cgroup_stat { - struct mem_cgroup_stat_cpu cpustat[0]; }; -static inline void -__mem_cgroup_stat_set_safe(struct mem_cgroup_stat_cpu *stat, - enum mem_cgroup_stat_index idx, s64 val) -{ - stat->count[idx] = val; -} - -static inline s64 -__mem_cgroup_stat_read_local(struct mem_cgroup_stat_cpu *stat, - enum mem_cgroup_stat_index idx) -{ - return stat->count[idx]; -} - -/* - * For accounting under irq disable, no need for increment preempt count. - */ -static inline void __mem_cgroup_stat_add_safe(struct mem_cgroup_stat_cpu *stat, - enum mem_cgroup_stat_index idx, int val) -{ - stat->count[idx] += val; -} - -static s64 mem_cgroup_read_stat(struct mem_cgroup_stat *stat, - enum mem_cgroup_stat_index idx) -{ - int cpu; - s64 ret = 0; - for_each_possible_cpu(cpu) - ret += stat->cpustat[cpu].count[idx]; - return ret; -} - -static s64 mem_cgroup_local_usage(struct mem_cgroup_stat *stat) -{ - s64 ret; - - ret = mem_cgroup_read_stat(stat, MEM_CGROUP_STAT_CACHE); - ret += mem_cgroup_read_stat(stat, MEM_CGROUP_STAT_RSS); - return ret; -} - /* * per-zone information in memory controller. */ @@ -270,9 +224,9 @@ struct mem_cgroup { unsigned long move_charge_at_immigrate; /* - * statistics. This must be placed at the end of memcg. + * percpu counter. */ - struct mem_cgroup_stat stat; + struct mem_cgroup_stat_cpu *stat; }; /* Stuffs for move charges at task migration. */ @@ -441,19 +395,14 @@ mem_cgroup_remove_exceeded(struct mem_cgroup *mem, static bool mem_cgroup_soft_limit_check(struct mem_cgroup *mem) { bool ret = false; - int cpu; s64 val; - struct mem_cgroup_stat_cpu *cpustat; - cpu = get_cpu(); - cpustat = &mem->stat.cpustat[cpu]; - val = __mem_cgroup_stat_read_local(cpustat, MEM_CGROUP_STAT_SOFTLIMIT); + val = this_cpu_read(mem->stat->count[MEM_CGROUP_STAT_SOFTLIMIT]); if (unlikely(val < 0)) { - __mem_cgroup_stat_set_safe(cpustat, MEM_CGROUP_STAT_SOFTLIMIT, + this_cpu_write(mem->stat->count[MEM_CGROUP_STAT_SOFTLIMIT], SOFTLIMIT_EVENTS_THRESH); ret = true; } - put_cpu(); return ret; } @@ -549,17 +498,31 @@ mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_zone *mctz) return mz; } +static s64 mem_cgroup_read_stat(struct mem_cgroup *mem, + enum mem_cgroup_stat_index idx) +{ + int cpu; + s64 val = 0; + + for_each_possible_cpu(cpu) + val += per_cpu(mem->stat->count[idx], cpu); + return val; +} + +static s64 mem_cgroup_local_usage(struct mem_cgroup *mem) +{ + s64 ret; + + ret = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_RSS); + ret += mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_CACHE); + return ret; +} + static void mem_cgroup_swap_statistics(struct mem_cgroup *mem, bool charge) { int val = (charge) ? 1 : -1; - struct mem_cgroup_stat *stat = &mem->stat; - struct mem_cgroup_stat_cpu *cpustat; - int cpu = get_cpu(); - - cpustat = &stat->cpustat[cpu]; - __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_SWAPOUT, val); - put_cpu(); + this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_SWAPOUT], val); } static void mem_cgroup_charge_statistics(struct mem_cgroup *mem, @@ -567,26 +530,22 @@ static void mem_cgroup_charge_statistics(struct mem_cgroup *mem, bool charge) { int val = (charge) ? 1 : -1; - struct mem_cgroup_stat *stat = &mem->stat; - struct mem_cgroup_stat_cpu *cpustat; - int cpu = get_cpu(); - cpustat = &stat->cpustat[cpu]; + preempt_disable(); + if (PageCgroupCache(pc)) - __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_CACHE, val); + __this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_CACHE], val); else - __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_RSS, val); + __this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_RSS], val); if (charge) - __mem_cgroup_stat_add_safe(cpustat, - MEM_CGROUP_STAT_PGPGIN_COUNT, 1); + __this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_PGPGIN_COUNT]); else - __mem_cgroup_stat_add_safe(cpustat, - MEM_CGROUP_STAT_PGPGOUT_COUNT, 1); - __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_SOFTLIMIT, -1); - __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_THRESHOLDS, -1); + __this_cpu_inc(mem->stat->count[MEM_CGROUP_STAT_PGPGOUT_COUNT]); + __this_cpu_dec(mem->stat->count[MEM_CGROUP_STAT_SOFTLIMIT]); + __this_cpu_dec(mem->stat->count[MEM_CGROUP_STAT_THRESHOLDS]); - put_cpu(); + preempt_enable(); } static unsigned long mem_cgroup_get_local_zonestat(struct mem_cgroup *mem, @@ -1244,7 +1203,7 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem, } } } - if (!mem_cgroup_local_usage(&victim->stat)) { + if (!mem_cgroup_local_usage(victim)) { /* this cgroup's local usage == 0 */ css_put(&victim->css); continue; @@ -1310,9 +1269,6 @@ static void record_last_oom(struct mem_cgroup *mem) void mem_cgroup_update_file_mapped(struct page *page, int val) { struct mem_cgroup *mem; - struct mem_cgroup_stat *stat; - struct mem_cgroup_stat_cpu *cpustat; - int cpu; struct page_cgroup *pc; pc = lookup_page_cgroup(page); @@ -1328,13 +1284,10 @@ void mem_cgroup_update_file_mapped(struct page *page, int val) goto done; /* - * Preemption is already disabled, we don't need get_cpu() + * Preemption is already disabled. We can use __this_cpu_xxx */ - cpu = smp_processor_id(); - stat = &mem->stat; - cpustat = &stat->cpustat[cpu]; + __this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED], val); - __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_FILE_MAPPED, val); done: unlock_page_cgroup(pc); } @@ -1761,9 +1714,6 @@ static void __mem_cgroup_move_account(struct page_cgroup *pc, struct mem_cgroup *from, struct mem_cgroup *to, bool uncharge) { struct page *page; - int cpu; - struct mem_cgroup_stat *stat; - struct mem_cgroup_stat_cpu *cpustat; VM_BUG_ON(from == to); VM_BUG_ON(PageLRU(pc->page)); @@ -1773,18 +1723,11 @@ static void __mem_cgroup_move_account(struct page_cgroup *pc, page = pc->page; if (page_mapped(page) && !PageAnon(page)) { - cpu = smp_processor_id(); - /* Update mapped_file data for mem_cgroup "from" */ - stat = &from->stat; - cpustat = &stat->cpustat[cpu]; - __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_FILE_MAPPED, - -1); - - /* Update mapped_file data for mem_cgroup "to" */ - stat = &to->stat; - cpustat = &stat->cpustat[cpu]; - __mem_cgroup_stat_add_safe(cpustat, MEM_CGROUP_STAT_FILE_MAPPED, - 1); + /* Update mapped_file data for mem_cgroup */ + preempt_disable(); + __this_cpu_dec(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]); + __this_cpu_inc(to->stat->count[MEM_CGROUP_STAT_FILE_MAPPED]); + preempt_enable(); } mem_cgroup_charge_statistics(from, pc, false); if (uncharge) @@ -2885,7 +2828,7 @@ static int mem_cgroup_get_idx_stat(struct mem_cgroup *mem, void *data) { struct mem_cgroup_idx_data *d = data; - d->val += mem_cgroup_read_stat(&mem->stat, d->idx); + d->val += mem_cgroup_read_stat(mem, d->idx); return 0; } @@ -3134,18 +3077,18 @@ static int mem_cgroup_get_local_stat(struct mem_cgroup *mem, void *data) s64 val; /* per cpu stat */ - val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_CACHE); + val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_CACHE); s->stat[MCS_CACHE] += val * PAGE_SIZE; - val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_RSS); + val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_RSS); s->stat[MCS_RSS] += val * PAGE_SIZE; - val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_FILE_MAPPED); + val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_FILE_MAPPED); s->stat[MCS_FILE_MAPPED] += val * PAGE_SIZE; - val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_PGPGIN_COUNT); + val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_PGPGIN_COUNT); s->stat[MCS_PGPGIN] += val; - val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_PGPGOUT_COUNT); + val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_PGPGOUT_COUNT); s->stat[MCS_PGPGOUT] += val; if (do_swap_account) { - val = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_SWAPOUT); + val = mem_cgroup_read_stat(mem, MEM_CGROUP_STAT_SWAPOUT); s->stat[MCS_SWAP] += val * PAGE_SIZE; } @@ -3276,19 +3219,14 @@ static int mem_cgroup_swappiness_write(struct cgroup *cgrp, struct cftype *cft, static bool mem_cgroup_threshold_check(struct mem_cgroup *mem) { bool ret = false; - int cpu; s64 val; - struct mem_cgroup_stat_cpu *cpustat; - cpu = get_cpu(); - cpustat = &mem->stat.cpustat[cpu]; - val = __mem_cgroup_stat_read_local(cpustat, MEM_CGROUP_STAT_THRESHOLDS); + val = this_cpu_read(mem->stat->count[MEM_CGROUP_STAT_THRESHOLDS]); if (unlikely(val < 0)) { - __mem_cgroup_stat_set_safe(cpustat, MEM_CGROUP_STAT_THRESHOLDS, + this_cpu_write(mem->stat->count[MEM_CGROUP_STAT_THRESHOLDS], THRESHOLDS_EVENTS_THRESH); ret = true; } - put_cpu(); return ret; } @@ -3676,17 +3614,12 @@ static void free_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node) kfree(mem->info.nodeinfo[node]); } -static int mem_cgroup_size(void) -{ - int cpustat_size = nr_cpu_ids * sizeof(struct mem_cgroup_stat_cpu); - return sizeof(struct mem_cgroup) + cpustat_size; -} - static struct mem_cgroup *mem_cgroup_alloc(void) { struct mem_cgroup *mem; - int size = mem_cgroup_size(); + int size = sizeof(struct mem_cgroup); + /* Can be very big if MAX_NUMNODES is very big */ if (size < PAGE_SIZE) mem = kmalloc(size, GFP_KERNEL); else @@ -3694,6 +3627,14 @@ static struct mem_cgroup *mem_cgroup_alloc(void) if (mem) memset(mem, 0, size); + mem->stat = alloc_percpu(struct mem_cgroup_stat_cpu); + if (!mem->stat) { + if (size < PAGE_SIZE) + kfree(mem); + else + vfree(mem); + mem = NULL; + } return mem; } @@ -3718,7 +3659,8 @@ static void __mem_cgroup_free(struct mem_cgroup *mem) for_each_node_state(node, N_POSSIBLE) free_mem_cgroup_per_zone_info(mem, node); - if (mem_cgroup_size() < PAGE_SIZE) + free_percpu(mem->stat); + if (sizeof(struct mem_cgroup) < PAGE_SIZE) kfree(mem); else vfree(mem); |
