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-rw-r--r--drivers/md/bcache/bcache.h2
-rw-r--r--drivers/md/bcache/journal.c47
-rw-r--r--drivers/md/bcache/util.h2
3 files changed, 36 insertions, 15 deletions
diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
index b98d7705acb6..a857eb3c10de 100644
--- a/drivers/md/bcache/bcache.h
+++ b/drivers/md/bcache/bcache.h
@@ -679,6 +679,8 @@ struct cache_set {
#define BUCKET_HASH_BITS 12
struct hlist_head bucket_hash[1 << BUCKET_HASH_BITS];
+
+ DECLARE_HEAP(struct btree *, flush_btree);
};
struct bbio {
diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
index f5296007a9d5..1b736b860739 100644
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -368,6 +368,12 @@ err:
}
/* Journalling */
+#define journal_max_cmp(l, r) \
+ (fifo_idx(&c->journal.pin, btree_current_write(l)->journal) < \
+ fifo_idx(&(c)->journal.pin, btree_current_write(r)->journal))
+#define journal_min_cmp(l, r) \
+ (fifo_idx(&c->journal.pin, btree_current_write(l)->journal) > \
+ fifo_idx(&(c)->journal.pin, btree_current_write(r)->journal))
static void btree_flush_write(struct cache_set *c)
{
@@ -375,25 +381,35 @@ static void btree_flush_write(struct cache_set *c)
* Try to find the btree node with that references the oldest journal
* entry, best is our current candidate and is locked if non NULL:
*/
- struct btree *b, *best;
- unsigned i;
+ struct btree *b;
+ int i;
atomic_long_inc(&c->flush_write);
+
retry:
- best = NULL;
-
- for_each_cached_btree(b, c, i)
- if (btree_current_write(b)->journal) {
- if (!best)
- best = b;
- else if (journal_pin_cmp(c,
- btree_current_write(best)->journal,
- btree_current_write(b)->journal)) {
- best = b;
+ spin_lock(&c->journal.lock);
+ if (heap_empty(&c->flush_btree)) {
+ for_each_cached_btree(b, c, i)
+ if (btree_current_write(b)->journal) {
+ if (!heap_full(&c->flush_btree))
+ heap_add(&c->flush_btree, b,
+ journal_max_cmp);
+ else if (journal_max_cmp(b,
+ heap_peek(&c->flush_btree))) {
+ c->flush_btree.data[0] = b;
+ heap_sift(&c->flush_btree, 0,
+ journal_max_cmp);
+ }
}
- }
- b = best;
+ for (i = c->flush_btree.used / 2 - 1; i >= 0; --i)
+ heap_sift(&c->flush_btree, i, journal_min_cmp);
+ }
+
+ b = NULL;
+ heap_pop(&c->flush_btree, b, journal_min_cmp);
+ spin_unlock(&c->journal.lock);
+
if (b) {
mutex_lock(&b->write_lock);
if (!btree_current_write(b)->journal) {
@@ -824,7 +840,8 @@ int bch_journal_alloc(struct cache_set *c)
j->w[0].c = c;
j->w[1].c = c;
- if (!(init_fifo(&j->pin, JOURNAL_PIN, GFP_KERNEL)) ||
+ if (!(init_heap(&c->flush_btree, 128, GFP_KERNEL)) ||
+ !(init_fifo(&j->pin, JOURNAL_PIN, GFP_KERNEL)) ||
!(j->w[0].data = (void *) __get_free_pages(GFP_KERNEL, JSET_BITS)) ||
!(j->w[1].data = (void *) __get_free_pages(GFP_KERNEL, JSET_BITS)))
return -ENOMEM;
diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h
index 4df4c5c1cab2..a6763db7f061 100644
--- a/drivers/md/bcache/util.h
+++ b/drivers/md/bcache/util.h
@@ -112,6 +112,8 @@ do { \
#define heap_full(h) ((h)->used == (h)->size)
+#define heap_empty(h) ((h)->used == 0)
+
#define DECLARE_FIFO(type, name) \
struct { \
size_t front, back, size, mask; \