diff options
Diffstat (limited to 'mm/vmstat.c')
| -rw-r--r-- | mm/vmstat.c | 85 |
1 files changed, 46 insertions, 39 deletions
diff --git a/mm/vmstat.c b/mm/vmstat.c index 6afc892a148a..78d53378db99 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1084,7 +1084,8 @@ int fragmentation_index(struct zone *zone, unsigned int order) } #endif -#if defined(CONFIG_PROC_FS) || defined(CONFIG_SYSFS) || defined(CONFIG_NUMA) +#if defined(CONFIG_PROC_FS) || defined(CONFIG_SYSFS) || \ + defined(CONFIG_NUMA) || defined(CONFIG_MEMCG) #ifdef CONFIG_ZONE_DMA #define TEXT_FOR_DMA(xx) xx "_dma", #else @@ -1134,7 +1135,7 @@ const char * const vmstat_text[] = { "numa_other", #endif - /* Node-based counters */ + /* enum node_stat_item counters */ "nr_inactive_anon", "nr_active_anon", "nr_inactive_file", @@ -1172,7 +1173,7 @@ const char * const vmstat_text[] = { "nr_dirty_threshold", "nr_dirty_background_threshold", -#ifdef CONFIG_VM_EVENT_COUNTERS +#if defined(CONFIG_VM_EVENT_COUNTERS) || defined(CONFIG_MEMCG) /* enum vm_event_item counters */ "pgpgin", "pgpgout", @@ -1291,9 +1292,9 @@ const char * const vmstat_text[] = { "swap_ra", "swap_ra_hit", #endif -#endif /* CONFIG_VM_EVENTS_COUNTERS */ +#endif /* CONFIG_VM_EVENT_COUNTERS || CONFIG_MEMCG */ }; -#endif /* CONFIG_PROC_FS || CONFIG_SYSFS || CONFIG_NUMA */ +#endif /* CONFIG_PROC_FS || CONFIG_SYSFS || CONFIG_NUMA || CONFIG_MEMCG */ #if (defined(CONFIG_DEBUG_FS) && defined(CONFIG_COMPACTION)) || \ defined(CONFIG_PROC_FS) @@ -1383,12 +1384,29 @@ static void pagetypeinfo_showfree_print(struct seq_file *m, unsigned long freecount = 0; struct free_area *area; struct list_head *curr; + bool overflow = false; area = &(zone->free_area[order]); - list_for_each(curr, &area->free_list[mtype]) - freecount++; - seq_printf(m, "%6lu ", freecount); + list_for_each(curr, &area->free_list[mtype]) { + /* + * Cap the free_list iteration because it might + * be really large and we are under a spinlock + * so a long time spent here could trigger a + * hard lockup detector. Anyway this is a + * debugging tool so knowing there is a handful + * of pages of this order should be more than + * sufficient. + */ + if (++freecount >= 100000) { + overflow = true; + break; + } + } + seq_printf(m, "%s%6lu ", overflow ? ">" : "", freecount); + spin_unlock_irq(&zone->lock); + cond_resched(); + spin_lock_irq(&zone->lock); } seq_putc(m, '\n'); } @@ -1547,10 +1565,8 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, if (is_zone_first_populated(pgdat, zone)) { seq_printf(m, "\n per-node stats"); for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) { - seq_printf(m, "\n %-12s %lu", - vmstat_text[i + NR_VM_ZONE_STAT_ITEMS + - NR_VM_NUMA_STAT_ITEMS], - node_page_state(pgdat, i)); + seq_printf(m, "\n %-12s %lu", node_stat_name(i), + node_page_state(pgdat, i)); } } seq_printf(m, @@ -1583,14 +1599,13 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat, } for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) - seq_printf(m, "\n %-12s %lu", vmstat_text[i], - zone_page_state(zone, i)); + seq_printf(m, "\n %-12s %lu", zone_stat_name(i), + zone_page_state(zone, i)); #ifdef CONFIG_NUMA for (i = 0; i < NR_VM_NUMA_STAT_ITEMS; i++) - seq_printf(m, "\n %-12s %lu", - vmstat_text[i + NR_VM_ZONE_STAT_ITEMS], - zone_numa_state_snapshot(zone, i)); + seq_printf(m, "\n %-12s %lu", numa_stat_name(i), + zone_numa_state_snapshot(zone, i)); #endif seq_printf(m, "\n pagesets"); @@ -1641,31 +1656,23 @@ static const struct seq_operations zoneinfo_op = { .show = zoneinfo_show, }; -enum writeback_stat_item { - NR_DIRTY_THRESHOLD, - NR_DIRTY_BG_THRESHOLD, - NR_VM_WRITEBACK_STAT_ITEMS, -}; +#define NR_VMSTAT_ITEMS (NR_VM_ZONE_STAT_ITEMS + \ + NR_VM_NUMA_STAT_ITEMS + \ + NR_VM_NODE_STAT_ITEMS + \ + NR_VM_WRITEBACK_STAT_ITEMS + \ + (IS_ENABLED(CONFIG_VM_EVENT_COUNTERS) ? \ + NR_VM_EVENT_ITEMS : 0)) static void *vmstat_start(struct seq_file *m, loff_t *pos) { unsigned long *v; - int i, stat_items_size; + int i; - if (*pos >= ARRAY_SIZE(vmstat_text)) + if (*pos >= NR_VMSTAT_ITEMS) return NULL; - stat_items_size = NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) + - NR_VM_NUMA_STAT_ITEMS * sizeof(unsigned long) + - NR_VM_NODE_STAT_ITEMS * sizeof(unsigned long) + - NR_VM_WRITEBACK_STAT_ITEMS * sizeof(unsigned long); - -#ifdef CONFIG_VM_EVENT_COUNTERS - stat_items_size += sizeof(struct vm_event_state); -#endif - BUILD_BUG_ON(stat_items_size != - ARRAY_SIZE(vmstat_text) * sizeof(unsigned long)); - v = kmalloc(stat_items_size, GFP_KERNEL); + BUILD_BUG_ON(ARRAY_SIZE(vmstat_text) < NR_VMSTAT_ITEMS); + v = kmalloc_array(NR_VMSTAT_ITEMS, sizeof(unsigned long), GFP_KERNEL); m->private = v; if (!v) return ERR_PTR(-ENOMEM); @@ -1698,7 +1705,7 @@ static void *vmstat_start(struct seq_file *m, loff_t *pos) static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos) { (*pos)++; - if (*pos >= ARRAY_SIZE(vmstat_text)) + if (*pos >= NR_VMSTAT_ITEMS) return NULL; return (unsigned long *)m->private + *pos; } @@ -1764,7 +1771,7 @@ int vmstat_refresh(struct ctl_table *table, int write, val = atomic_long_read(&vm_zone_stat[i]); if (val < 0) { pr_warn("%s: %s %ld\n", - __func__, vmstat_text[i], val); + __func__, zone_stat_name(i), val); err = -EINVAL; } } @@ -1773,7 +1780,7 @@ int vmstat_refresh(struct ctl_table *table, int write, val = atomic_long_read(&vm_numa_stat[i]); if (val < 0) { pr_warn("%s: %s %ld\n", - __func__, vmstat_text[i + NR_VM_ZONE_STAT_ITEMS], val); + __func__, numa_stat_name(i), val); err = -EINVAL; } } @@ -1972,7 +1979,7 @@ void __init init_mm_internals(void) #endif #ifdef CONFIG_PROC_FS proc_create_seq("buddyinfo", 0444, NULL, &fragmentation_op); - proc_create_seq("pagetypeinfo", 0444, NULL, &pagetypeinfo_op); + proc_create_seq("pagetypeinfo", 0400, NULL, &pagetypeinfo_op); proc_create_seq("vmstat", 0444, NULL, &vmstat_op); proc_create_seq("zoneinfo", 0444, NULL, &zoneinfo_op); #endif |