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Print out statistics in relation to fragmentation avoidance to /proc/pagetypeinfo
This patch provides fragmentation avoidance statistics via /proc/pagetypeinfo. The information is collected only on request so there is no runtime overhead. The statistics are in three parts: The first part prints information on the size of blocks that pages are being grouped on and looks like Page block order: 10 Pages per block: 1024 The second part is a more detailed version of /proc/buddyinfo and looks like Free pages count per migrate type at order 0 1 2 3 4 5 6 7 8 9 10 Node 0, zone DMA, type Unmovable 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA, type Reclaimable 1 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA, type Movable 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone DMA, type Reserve 0 4 4 0 0 0 0 1 0 1 0 Node 0, zone Normal, type Unmovable 111 8 4 4 2 3 1 0 0 0 0 Node 0, zone Normal, type Reclaimable 293 89 8 0 0 0 0 0 0 0 0 Node 0, zone Normal, type Movable 1 6 13 9 7 6 3 0 0 0 0 Node 0, zone Normal, type Reserve 0 0 0 0 0 0 0 0 0 0 4 The third part looks like Number of blocks type Unmovable Reclaimable Movable Reserve Node 0, zone DMA 0 1 2 1 Node 0, zone Normal 3 17 94 4 To walk the zones within a node with interrupts disabled, walk_zones_in_node() is introduced and shared between /proc/buddyinfo, /proc/zoneinfo and /proc/pagetypeinfo to reduce code duplication. It seems specific to what vmstat.c requires but could be broken out as a general utility function in mmzone.c if there were other other potential users. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Acked-by: Andy Whitcroft <apw@shadowen.org> Acked-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman
Linus Torvalds
parent
d9c2340052
commit
467c996c1e
@ -229,6 +229,19 @@ static const 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 pagetypeinfo_op;
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static int pagetypeinfo_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &pagetypeinfo_op);
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}
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static const struct file_operations pagetypeinfo_file_ops = {
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.open = pagetypeinfo_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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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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@ -724,6 +737,7 @@ void __init proc_misc_init(void)
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#endif
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#endif
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create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
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create_seq_entry("pagetypeinfo", S_IRUGO, &pagetypeinfo_file_ops);
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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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#ifdef CONFIG_BLOCK
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@ -104,6 +104,18 @@ struct vm_area_struct;
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/* 4GB DMA on some platforms */
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#define GFP_DMA32 __GFP_DMA32
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/* Convert GFP flags to their corresponding migrate type */
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static inline int allocflags_to_migratetype(gfp_t gfp_flags)
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{
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WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
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if (unlikely(page_group_by_mobility_disabled))
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return MIGRATE_UNMOVABLE;
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/* Group based on mobility */
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return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) |
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((gfp_flags & __GFP_RECLAIMABLE) != 0);
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}
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static inline enum zone_type gfp_zone(gfp_t flags)
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{
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@ -43,6 +43,16 @@
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for (order = 0; order < MAX_ORDER; order++) \
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for (type = 0; type < MIGRATE_TYPES; type++)
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extern int page_group_by_mobility_disabled;
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static inline int get_pageblock_migratetype(struct page *page)
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{
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if (unlikely(page_group_by_mobility_disabled))
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return MIGRATE_UNMOVABLE;
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return get_pageblock_flags_group(page, PB_migrate, PB_migrate_end);
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}
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struct free_area {
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struct list_head free_list[MIGRATE_TYPES];
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unsigned long nr_free;
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@ -164,32 +164,12 @@ EXPORT_SYMBOL(nr_node_ids);
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int page_group_by_mobility_disabled __read_mostly;
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static inline int get_pageblock_migratetype(struct page *page)
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{
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if (unlikely(page_group_by_mobility_disabled))
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return MIGRATE_UNMOVABLE;
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return get_pageblock_flags_group(page, PB_migrate, PB_migrate_end);
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}
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static void set_pageblock_migratetype(struct page *page, int migratetype)
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{
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set_pageblock_flags_group(page, (unsigned long)migratetype,
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PB_migrate, PB_migrate_end);
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}
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static inline int allocflags_to_migratetype(gfp_t gfp_flags)
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{
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WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
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if (unlikely(page_group_by_mobility_disabled))
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return MIGRATE_UNMOVABLE;
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/* Cluster based on mobility */
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return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) |
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((gfp_flags & __GFP_RECLAIMABLE) != 0);
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}
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#ifdef CONFIG_DEBUG_VM
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static int page_outside_zone_boundaries(struct zone *zone, struct page *page)
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{
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170
mm/vmstat.c
170
mm/vmstat.c
@ -398,6 +398,13 @@ void zone_statistics(struct zonelist *zonelist, struct zone *z)
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#include <linux/seq_file.h>
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static char * const migratetype_names[MIGRATE_TYPES] = {
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"Unmovable",
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"Reclaimable",
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"Movable",
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"Reserve",
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};
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static void *frag_start(struct seq_file *m, loff_t *pos)
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{
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pg_data_t *pgdat;
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@ -422,28 +429,144 @@ static void frag_stop(struct seq_file *m, void *arg)
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{
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}
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/*
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* This walks the free areas for each zone.
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*/
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static int frag_show(struct seq_file *m, void *arg)
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/* Walk all the zones in a node and print using a callback */
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static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat,
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void (*print)(struct seq_file *m, pg_data_t *, struct zone *))
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{
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pg_data_t *pgdat = (pg_data_t *)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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int order;
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for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
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if (!populated_zone(zone))
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continue;
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spin_lock_irqsave(&zone->lock, flags);
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print(m, pgdat, zone);
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spin_unlock_irqrestore(&zone->lock, flags);
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}
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}
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static void frag_show_print(struct seq_file *m, pg_data_t *pgdat,
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struct zone *zone)
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{
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int order;
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seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name);
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for (order = 0; order < MAX_ORDER; ++order)
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seq_printf(m, "%6lu ", zone->free_area[order].nr_free);
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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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/*
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* This walks the free areas for each zone.
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*/
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static int frag_show(struct seq_file *m, void *arg)
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{
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pg_data_t *pgdat = (pg_data_t *)arg;
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walk_zones_in_node(m, pgdat, frag_show_print);
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return 0;
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}
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static void pagetypeinfo_showfree_print(struct seq_file *m,
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pg_data_t *pgdat, struct zone *zone)
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{
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int order, mtype;
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for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) {
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seq_printf(m, "Node %4d, zone %8s, type %12s ",
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pgdat->node_id,
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zone->name,
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migratetype_names[mtype]);
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for (order = 0; order < MAX_ORDER; ++order) {
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unsigned long freecount = 0;
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struct free_area *area;
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struct list_head *curr;
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area = &(zone->free_area[order]);
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list_for_each(curr, &area->free_list[mtype])
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freecount++;
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seq_printf(m, "%6lu ", freecount);
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}
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seq_putc(m, '\n');
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}
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}
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/* Print out the free pages at each order for each migatetype */
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static int pagetypeinfo_showfree(struct seq_file *m, void *arg)
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{
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int order;
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pg_data_t *pgdat = (pg_data_t *)arg;
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/* Print header */
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seq_printf(m, "%-43s ", "Free pages count per migrate type at order");
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for (order = 0; order < MAX_ORDER; ++order)
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seq_printf(m, "%6d ", order);
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seq_putc(m, '\n');
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walk_zones_in_node(m, pgdat, pagetypeinfo_showfree_print);
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return 0;
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}
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static void pagetypeinfo_showblockcount_print(struct seq_file *m,
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pg_data_t *pgdat, struct zone *zone)
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{
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int mtype;
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unsigned long pfn;
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unsigned long start_pfn = zone->zone_start_pfn;
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unsigned long end_pfn = start_pfn + zone->spanned_pages;
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unsigned long count[MIGRATE_TYPES] = { 0, };
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for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) {
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struct page *page;
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if (!pfn_valid(pfn))
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continue;
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page = pfn_to_page(pfn);
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mtype = get_pageblock_migratetype(page);
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count[mtype]++;
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}
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/* Print counts */
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seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name);
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for (mtype = 0; mtype < MIGRATE_TYPES; mtype++)
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seq_printf(m, "%12lu ", count[mtype]);
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seq_putc(m, '\n');
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}
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/* Print out the free pages at each order for each migratetype */
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static int pagetypeinfo_showblockcount(struct seq_file *m, void *arg)
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{
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int mtype;
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pg_data_t *pgdat = (pg_data_t *)arg;
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seq_printf(m, "\n%-23s", "Number of blocks type ");
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for (mtype = 0; mtype < MIGRATE_TYPES; mtype++)
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seq_printf(m, "%12s ", migratetype_names[mtype]);
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seq_putc(m, '\n');
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walk_zones_in_node(m, pgdat, pagetypeinfo_showblockcount_print);
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return 0;
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}
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/*
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* This prints out statistics in relation to grouping pages by mobility.
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* It is expensive to collect so do not constantly read the file.
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*/
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static int pagetypeinfo_show(struct seq_file *m, void *arg)
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{
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pg_data_t *pgdat = (pg_data_t *)arg;
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seq_printf(m, "Page block order: %d\n", pageblock_order);
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seq_printf(m, "Pages per block: %lu\n", pageblock_nr_pages);
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seq_putc(m, '\n');
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pagetypeinfo_showfree(m, pgdat);
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pagetypeinfo_showblockcount(m, pgdat);
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return 0;
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}
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@ -454,6 +577,13 @@ const struct seq_operations fragmentation_op = {
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.show = frag_show,
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};
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const struct seq_operations pagetypeinfo_op = {
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.start = frag_start,
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.next = frag_next,
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.stop = frag_stop,
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.show = pagetypeinfo_show,
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};
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#ifdef CONFIG_ZONE_DMA
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#define TEXT_FOR_DMA(xx) xx "_dma",
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#else
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@ -532,23 +662,10 @@ static const char * const vmstat_text[] = {
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#endif
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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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static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
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struct zone *zone)
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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 (!populated_zone(zone))
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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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@ -607,9 +724,16 @@ static int zoneinfo_show(struct seq_file *m, void *arg)
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zone->all_unreclaimable,
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zone->prev_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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/*
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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 = (pg_data_t *)arg;
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walk_zones_in_node(m, pgdat, zoneinfo_show_print);
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return 0;
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}
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