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Subject[PATCH 4/8] Fragmentation Avoidance V17: 004_markfree
Date
This patch alters show_free_areas() to print out the number of free pages
for each reclaim type. Without this patch, only an aggregate number is
displayed. Before this patch, the output of show_free_area() would include
something like;

DMA: 2*4kB 1*8kB 5*16kB 3*32kB 3*64kB 3*128kB 2*256kB 0*512kB 1*1024kB 1*2048kB 2*4096kB = 12544kB
Normal: 34*4kB 57*8kB 14*16kB 4*32kB 4*64kB 2*128kB 2*256kB 2*512kB 2*1024kB 2*2048kB 210*4096kB = 869296kB
HighMem: 1*4kB 0*8kB 15*16kB 23*32kB 11*64kB 10*128kB 2*256kB 2*512kB 1*1024kB 1*2048kB 153*4096kB = 634260kB

After, it shows something like;

DMA: (2+0+0+0)2*4kB (1+0+0+0)1*8kB (5+0+0+0)5*16kB (3+0+0+0)3*32kB (3+0+0+0)3*64kB (3+0+0+0)3*128kB (2+0+0+0)2*256kB (0+0+0+0)0*512kB (1+0+0+0)1*1024kB (1+0+0+0)1*2048kB (2+0+0+0)2*4096kB = 12544kB
Normal: (21+0+13+0)34*4kB (52+1+4+0)57*8kB (12+0+2+0)14*16kB (2+1+1+0)4*32kB (3+1+0+0)4*64kB (1+0+1+0)2*128kB (1+1+0+0)2*256kB (1+1+0+0)2*512kB (1+0+1+0)2*1024kB (1+0+1+0)2*2048kB (210+0+0+0)210*4096kB = 869296kB
HighMem: (1+0+0+0)1*4kB (0+0+0+0)0*8kB (0+15+0+0)15*16kB (1+22+0+0)23*32kB (0+11+0+0)11*64kB (2+8+0+0)10*128kB (0+2+0+0)2*256kB (0+2+0+0)2*512kB (0+1+0+0)1*1024kB (1+0+0+0)1*2048kB (153+0+0+0)153*4096kB = 634260kB

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.14-rc3-003_fragcore/mm/page_alloc.c linux-2.6.14-rc3-004_markfree/mm/page_alloc.c
--- linux-2.6.14-rc3-003_fragcore/mm/page_alloc.c 2005-10-11 12:08:07.000000000 +0100
+++ linux-2.6.14-rc3-004_markfree/mm/page_alloc.c 2005-10-11 12:08:47.000000000 +0100
@@ -1524,12 +1524,14 @@ void show_free_areas(void)
}

for_each_zone(zone) {
- unsigned long nr = 0;
+ unsigned long tnr = 0;
unsigned long total = 0;
- unsigned long flags,order;
+ unsigned long nr,flags,order;
+
+

show_node(zone);
- printk("%s: ", zone->name);
+ printk("%s: (", zone->name);
if (!zone->present_pages) {
printk("empty\n");
continue;
@@ -1537,17 +1539,21 @@ void show_free_areas(void)

spin_lock_irqsave(&zone->lock, flags);
for_each_rclmtype_order(type, order) {
- nr += zone->free_area_lists[type][order].nr_free;
+ nr = zone->free_area_lists[type][order].nr_free;
+ tnr += nr;
total += nr << order;

+ printk("%lu", nr);
/*
* if type had reached RCLM_TYPE, the free pages
* for this order have been summed up
*/
if (type == RCLM_TYPES-1) {
- printk("%lu*%lukB ", nr, K(1UL) << order);
+ printk(")%lu*%lukB %s", tnr, K(1UL) << order,
+ order == MAX_ORDER-1 ? "" : "(");
nr = 0;
- }
+ } else
+ printk("+");
}
spin_unlock_irqrestore(&zone->lock, flags);
printk("= %lukB\n", K(total));
-
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