[PATCH] mm: add /proc/zoneinfo

Add /proc/zoneinfo file to display information about memory zones.  Useful
to analyze VM behaviour.

Signed-off-by: Nikita Danilov <nikita@clusterfs.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index a60a3b3d8a7b1c31870dee3d947fe119a5787a5d..63a9fbf1ac51be4f8bf06d772c70d2c6083cd833 100644 (file)
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -219,6 +219,19 @@ static struct file_operations fragmentation_file_operations = {
        .release        = seq_release,
 };
 
+extern struct seq_operations zoneinfo_op;
+static int zoneinfo_open(struct inode *inode, struct file *file)
+{
+       return seq_open(file, &zoneinfo_op);
+}
+
+static struct file_operations proc_zoneinfo_file_operations = {
+       .open           = zoneinfo_open,
+       .read           = seq_read,
+       .llseek         = seq_lseek,
+       .release        = seq_release,
+};
+
 static int version_read_proc(char *page, char **start, off_t off,
                                 int count, int *eof, void *data)
 {
@@ -589,6 +602,7 @@ void __init proc_misc_init(void)
        create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
        create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
        create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
+       create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
        create_seq_entry("diskstats", 0, &proc_diskstats_operations);
 #ifdef CONFIG_MODULES
        create_seq_entry("modules", 0, &proc_modules_operations);

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b1061b1962f86497a0deb83c2409b0e571fbf9d3..40169f0b7e9e681a01931f431a03d50c7da5449b 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1853,6 +1853,115 @@ struct seq_operations fragmentation_op = {
        .show   = frag_show,
 };
 
+/*
+ * Output information about zones in @pgdat.
+ */
+static int zoneinfo_show(struct seq_file *m, void *arg)
+{
+       pg_data_t *pgdat = arg;
+       struct zone *zone;
+       struct zone *node_zones = pgdat->node_zones;
+       unsigned long flags;
+
+       for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; zone++) {
+               int i;
+
+               if (!zone->present_pages)
+                       continue;
+
+               spin_lock_irqsave(&zone->lock, flags);
+               seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name);
+               seq_printf(m,
+                          "\n  pages free     %lu"
+                          "\n        min      %lu"
+                          "\n        low      %lu"
+                          "\n        high     %lu"
+                          "\n        active   %lu"
+                          "\n        inactive %lu"
+                          "\n        scanned  %lu (a: %lu i: %lu)"
+                          "\n        spanned  %lu"
+                          "\n        present  %lu",
+                          zone->free_pages,
+                          zone->pages_min,
+                          zone->pages_low,
+                          zone->pages_high,
+                          zone->nr_active,
+                          zone->nr_inactive,
+                          zone->pages_scanned,
+                          zone->nr_scan_active, zone->nr_scan_inactive,
+                          zone->spanned_pages,
+                          zone->present_pages);
+               seq_printf(m,
+                          "\n        protection: (%lu",
+                          zone->lowmem_reserve[0]);
+               for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++)
+                       seq_printf(m, ", %lu", zone->lowmem_reserve[i]);
+               seq_printf(m,
+                          ")"
+                          "\n  pagesets");
+               for (i = 0; i < ARRAY_SIZE(zone->pageset); i++) {
+                       struct per_cpu_pageset *pageset;
+                       int j;
+
+                       pageset = &zone->pageset[i];
+                       for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) {
+                               if (pageset->pcp[j].count)
+                                       break;
+                       }
+                       if (j == ARRAY_SIZE(pageset->pcp))
+                               continue;
+                       for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) {
+                               seq_printf(m,
+                                          "\n    cpu: %i pcp: %i"
+                                          "\n              count: %i"
+                                          "\n              low:   %i"
+                                          "\n              high:  %i"
+                                          "\n              batch: %i",
+                                          i, j,
+                                          pageset->pcp[j].count,
+                                          pageset->pcp[j].low,
+                                          pageset->pcp[j].high,
+                                          pageset->pcp[j].batch);
+                       }
+#ifdef CONFIG_NUMA
+                       seq_printf(m,
+                                  "\n            numa_hit:       %lu"
+                                  "\n            numa_miss:      %lu"
+                                  "\n            numa_foreign:   %lu"
+                                  "\n            interleave_hit: %lu"
+                                  "\n            local_node:     %lu"
+                                  "\n            other_node:     %lu",
+                                  pageset->numa_hit,
+                                  pageset->numa_miss,
+                                  pageset->numa_foreign,
+                                  pageset->interleave_hit,
+                                  pageset->local_node,
+                                  pageset->other_node);
+#endif
+               }
+               seq_printf(m,
+                          "\n  all_unreclaimable: %u"
+                          "\n  prev_priority:     %i"
+                          "\n  temp_priority:     %i"
+                          "\n  start_pfn:         %lu",
+                          zone->all_unreclaimable,
+                          zone->prev_priority,
+                          zone->temp_priority,
+                          zone->zone_start_pfn);
+               spin_unlock_irqrestore(&zone->lock, flags);
+               seq_putc(m, '\n');
+       }
+       return 0;
+}
+
+struct seq_operations zoneinfo_op = {
+       .start  = frag_start, /* iterate over all zones. The same as in
+                              * fragmentation. */
+       .next   = frag_next,
+       .stop   = frag_stop,
+       .show   = zoneinfo_show,
+};
+
 static char *vmstat_text[] = {
        "nr_dirty",
        "nr_writeback",
@@ -2058,10 +2167,10 @@ static void setup_per_zone_pages_min(void)
                                min_pages = 128;
                        zone->pages_min = min_pages;
                } else {
-                       /* if it's a lowmem zone, reserve a number of pages 
+                       /* if it's a lowmem zone, reserve a number of pages
                         * proportionate to the zone's size.
                         */
-                       zone->pages_min = (pages_min * zone->present_pages) / 
+                       zone->pages_min = (pages_min * zone->present_pages) /
                                           lowmem_pages;
                }