drivers/staging/zcache/debug.c

   1 #include <linux/atomic.h>
   2 #include "debug.h"
   3
   4 #ifdef CONFIG_ZCACHE_DEBUG
   5 #include <linux/debugfs.h>
   6
   7 #define ATTR(x)  { .name = #x, .val = &zcache_##x, }
   8 static struct debug_entry {
   9         const char *name;
  10         ssize_t *val;
  11 } attrs[] = {
  12         ATTR(obj_count), ATTR(obj_count_max),
  13         ATTR(objnode_count), ATTR(objnode_count_max),
  14         ATTR(flush_total), ATTR(flush_found),
  15         ATTR(flobj_total), ATTR(flobj_found),
  16         ATTR(failed_eph_puts), ATTR(failed_pers_puts),
  17         ATTR(failed_getfreepages), ATTR(failed_alloc),
  18         ATTR(put_to_flush),
  19         ATTR(compress_poor), ATTR(mean_compress_poor),
  20         ATTR(eph_ate_tail), ATTR(eph_ate_tail_failed),
  21         ATTR(pers_ate_eph), ATTR(pers_ate_eph_failed),
  22         ATTR(evicted_eph_zpages), ATTR(evicted_eph_pageframes),
  23         ATTR(eph_pageframes), ATTR(eph_pageframes_max),
  24         ATTR(eph_zpages), ATTR(eph_zpages_max),
  25         ATTR(pers_zpages), ATTR(pers_zpages_max),
  26         ATTR(last_active_file_pageframes),
  27         ATTR(last_inactive_file_pageframes),
  28         ATTR(last_active_anon_pageframes),
  29         ATTR(last_inactive_anon_pageframes),
  30         ATTR(eph_nonactive_puts_ignored),
  31         ATTR(pers_nonactive_puts_ignored),
  32 #ifdef CONFIG_ZCACHE_WRITEBACK
  33         ATTR(zcache_outstanding_writeback_pages),
  34         ATTR(zcache_writtenback_pages),
  35 #endif
  36 };
  37 #undef ATTR
  38 int zcache_debugfs_init(void)
  39 {
  40         unsigned int i;
  41         struct dentry *root = debugfs_create_dir("zcache", NULL);
  42         if (root == NULL)
  43                 return -ENXIO;
  44
  45         for (i = 0; i < ARRAY_SIZE(attrs); i++)
  46                 if (!debugfs_create_size_t(attrs[i].name, S_IRUGO, root, attrs[i].val))
  47                         goto out;
  48
  49         debugfs_create_u64("eph_zbytes", S_IRUGO, root, &zcache_eph_zbytes);
  50         debugfs_create_u64("eph_zbytes_max", S_IRUGO, root, &zcache_eph_zbytes_max);
  51         debugfs_create_u64("pers_zbytes", S_IRUGO, root, &zcache_pers_zbytes);
  52         debugfs_create_u64("pers_zbytes_max", S_IRUGO, root, &zcache_pers_zbytes_max);
  53
  54         return 0;
  55 out:
  56         return -ENODEV;
  57 }
  58
  59 /* developers can call this in case of ooms, e.g. to find memory leaks */
  60 void zcache_dump(void)
  61 {
  62         unsigned int i;
  63         for (i = 0; i < ARRAY_SIZE(attrs); i++)
  64                 pr_debug("zcache: %s=%zu\n", attrs[i].name, *attrs[i].val);
  65
  66         pr_debug("zcache: eph_zbytes=%llu\n", (unsigned long long)zcache_eph_zbytes);
  67         pr_debug("zcache: eph_zbytes_max=%llu\n", (unsigned long long)zcache_eph_zbytes_max);
  68         pr_debug("zcache: pers_zbytes=%llu\n", (unsigned long long)zcache_pers_zbytes);
  69         pr_debug("zcache: pers_zbytes_max=%llu\n", (unsigned long long)zcache_pers_zbytes_max);
  70 }
  71 #endif