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mm: vmscan: Add a debug file for shrinkers 

This patch adds a debugfs file called "shrinker" when read this calls
all the shrinkers in the system with nr_to_scan set to zero and prints
the result.  These results are the number of objects the shrinkers have
available and can thus be used an indication of the total memory
that would be availble to the system if a shrink occurred.

Change-Id: Ied0ee7caff3d2fc1cb4bb839aaafee81b5b0b143
Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
This commit is contained in:
Rebecca Schultz Zavin 2012-10-05 13:54:59 -07:00 committed by Arve Hjønnevåg
parent 148984e00a
commit ad42da0cc7
1 changed files with 44 additions and 0 deletions
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44
mm/vmscan.c
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@ -43,6 +43,7 @@
#include <linux/sysctl.h>
#include <linux/oom.h>
#include <linux/prefetch.h>
#include <linux/debugfs.h>
#include <asm/tlbflush.h>
#include <asm/div64.h>
@ -154,6 +155,40 @@ static unsigned long get_lru_size(struct lruvec *lruvec, enum lru_list lru)
return zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru);
}
struct dentry *debug_file;
static int debug_shrinker_show(struct seq_file *s, void *unused)
{
struct shrinker *shrinker;
struct shrink_control sc;
sc.gfp_mask = -1;
sc.nr_to_scan = 0;
down_read(&shrinker_rwsem);
list_for_each_entry(shrinker, &shrinker_list, list) {
char name[64];
int num_objs;
num_objs = shrinker->shrink(shrinker, &sc);
seq_printf(s, "%pf %d\n", shrinker->shrink, num_objs);
}
up_read(&shrinker_rwsem);
return 0;
}
static int debug_shrinker_open(struct inode *inode, struct file *file)
{
return single_open(file, debug_shrinker_show, inode->i_private);
}
static const struct file_operations debug_shrinker_fops = {
.open = debug_shrinker_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
/*
* Add a shrinker callback to be called from the vm
*/
@ -166,6 +201,15 @@ void register_shrinker(struct shrinker *shrinker)
}
EXPORT_SYMBOL(register_shrinker);
static int __init add_shrinker_debug(void)
{
debugfs_create_file("shrinker", 0644, NULL, NULL,
&debug_shrinker_fops);
return 0;
}
late_initcall(add_shrinker_debug);
/*
* Remove one
*/