bcache: Improve priority_stats
Break down data into clean data/dirty data/metadata.
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index d8458d4..662b948 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -761,7 +761,9 @@
int cmp(const void *l, const void *r)
{ return *((uint16_t *) r) - *((uint16_t *) l); }
- size_t n = ca->sb.nbuckets, i, unused, btree;
+ struct bucket *b;
+ size_t n = ca->sb.nbuckets, i;
+ size_t unused = 0, available = 0, dirty = 0, meta = 0;
uint64_t sum = 0;
/* Compute 31 quantiles */
uint16_t q[31], *p, *cached;
@@ -772,6 +774,17 @@
return -ENOMEM;
mutex_lock(&ca->set->bucket_lock);
+ for_each_bucket(b, ca) {
+ if (!GC_SECTORS_USED(b))
+ unused++;
+ if (GC_MARK(b) == GC_MARK_RECLAIMABLE)
+ available++;
+ if (GC_MARK(b) == GC_MARK_DIRTY)
+ dirty++;
+ if (GC_MARK(b) == GC_MARK_METADATA)
+ meta++;
+ }
+
for (i = ca->sb.first_bucket; i < n; i++)
p[i] = ca->buckets[i].prio;
mutex_unlock(&ca->set->bucket_lock);
@@ -786,10 +799,7 @@
while (cached < p + n &&
*cached == BTREE_PRIO)
- cached++;
-
- btree = cached - p;
- n -= btree;
+ cached++, n--;
for (i = 0; i < n; i++)
sum += INITIAL_PRIO - cached[i];
@@ -805,12 +815,16 @@
ret = scnprintf(buf, PAGE_SIZE,
"Unused: %zu%%\n"
+ "Clean: %zu%%\n"
+ "Dirty: %zu%%\n"
"Metadata: %zu%%\n"
"Average: %llu\n"
"Sectors per Q: %zu\n"
"Quantiles: [",
unused * 100 / (size_t) ca->sb.nbuckets,
- btree * 100 / (size_t) ca->sb.nbuckets, sum,
+ available * 100 / (size_t) ca->sb.nbuckets,
+ dirty * 100 / (size_t) ca->sb.nbuckets,
+ meta * 100 / (size_t) ca->sb.nbuckets, sum,
n * ca->sb.bucket_size / (ARRAY_SIZE(q) + 1));
for (i = 0; i < ARRAY_SIZE(q); i++)