Commit 295ab934 authored by Nikita Danilov's avatar Nikita Danilov Committed by Linus Torvalds
Browse files

[PATCH] mm: add /proc/zoneinfo 



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

Signed-off-by: default avatarNikita Danilov <nikita@clusterfs.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 05b74384

fs/proc/proc_misc.c

+14 −0
Original line number Diff line number Diff line
@@ -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);

mm/page_alloc.c

+111 −2
Original line number Diff line number Diff line
@@ -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",