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[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>
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05b7438475
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295ab93497
@ -219,6 +219,19 @@ static struct file_operations fragmentation_file_operations = {
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.release = seq_release,
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};
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extern struct seq_operations zoneinfo_op;
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static int zoneinfo_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &zoneinfo_op);
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}
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static struct file_operations proc_zoneinfo_file_operations = {
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.open = zoneinfo_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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static int version_read_proc(char *page, char **start, off_t off,
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int count, int *eof, void *data)
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{
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@ -589,6 +602,7 @@ void __init proc_misc_init(void)
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create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
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create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
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create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
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create_seq_entry("zoneinfo",S_IRUGO, &proc_zoneinfo_file_operations);
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create_seq_entry("diskstats", 0, &proc_diskstats_operations);
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#ifdef CONFIG_MODULES
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create_seq_entry("modules", 0, &proc_modules_operations);
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113
mm/page_alloc.c
113
mm/page_alloc.c
@ -1853,6 +1853,115 @@ struct seq_operations fragmentation_op = {
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.show = frag_show,
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};
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/*
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* Output information about zones in @pgdat.
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*/
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static int zoneinfo_show(struct seq_file *m, void *arg)
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{
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pg_data_t *pgdat = arg;
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struct zone *zone;
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struct zone *node_zones = pgdat->node_zones;
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unsigned long flags;
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for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; zone++) {
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int i;
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if (!zone->present_pages)
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continue;
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spin_lock_irqsave(&zone->lock, flags);
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seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name);
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seq_printf(m,
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"\n pages free %lu"
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"\n min %lu"
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"\n low %lu"
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"\n high %lu"
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"\n active %lu"
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"\n inactive %lu"
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"\n scanned %lu (a: %lu i: %lu)"
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"\n spanned %lu"
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"\n present %lu",
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zone->free_pages,
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zone->pages_min,
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zone->pages_low,
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zone->pages_high,
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zone->nr_active,
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zone->nr_inactive,
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zone->pages_scanned,
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zone->nr_scan_active, zone->nr_scan_inactive,
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zone->spanned_pages,
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zone->present_pages);
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seq_printf(m,
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"\n protection: (%lu",
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zone->lowmem_reserve[0]);
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for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++)
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seq_printf(m, ", %lu", zone->lowmem_reserve[i]);
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seq_printf(m,
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")"
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"\n pagesets");
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for (i = 0; i < ARRAY_SIZE(zone->pageset); i++) {
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struct per_cpu_pageset *pageset;
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int j;
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pageset = &zone->pageset[i];
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for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) {
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if (pageset->pcp[j].count)
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break;
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}
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if (j == ARRAY_SIZE(pageset->pcp))
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continue;
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for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) {
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seq_printf(m,
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"\n cpu: %i pcp: %i"
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"\n count: %i"
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"\n low: %i"
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"\n high: %i"
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"\n batch: %i",
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i, j,
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pageset->pcp[j].count,
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pageset->pcp[j].low,
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pageset->pcp[j].high,
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pageset->pcp[j].batch);
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}
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#ifdef CONFIG_NUMA
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seq_printf(m,
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"\n numa_hit: %lu"
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"\n numa_miss: %lu"
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"\n numa_foreign: %lu"
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"\n interleave_hit: %lu"
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"\n local_node: %lu"
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"\n other_node: %lu",
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pageset->numa_hit,
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pageset->numa_miss,
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pageset->numa_foreign,
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pageset->interleave_hit,
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pageset->local_node,
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pageset->other_node);
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#endif
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}
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seq_printf(m,
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"\n all_unreclaimable: %u"
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"\n prev_priority: %i"
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"\n temp_priority: %i"
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"\n start_pfn: %lu",
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zone->all_unreclaimable,
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zone->prev_priority,
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zone->temp_priority,
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zone->zone_start_pfn);
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spin_unlock_irqrestore(&zone->lock, flags);
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seq_putc(m, '\n');
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}
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return 0;
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}
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struct seq_operations zoneinfo_op = {
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.start = frag_start, /* iterate over all zones. The same as in
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* fragmentation. */
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.next = frag_next,
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.stop = frag_stop,
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.show = zoneinfo_show,
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};
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static char *vmstat_text[] = {
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"nr_dirty",
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"nr_writeback",
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@ -2058,10 +2167,10 @@ static void setup_per_zone_pages_min(void)
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min_pages = 128;
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zone->pages_min = min_pages;
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} else {
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/* if it's a lowmem zone, reserve a number of pages
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/* if it's a lowmem zone, reserve a number of pages
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* proportionate to the zone's size.
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*/
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zone->pages_min = (pages_min * zone->present_pages) /
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zone->pages_min = (pages_min * zone->present_pages) /
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lowmem_pages;
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}
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