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| author | Kent Overstreet <kmo@daterainc.com> | 2013-08-09 21:14:13 -0700 |
|---|---|---|
| committer | Kent Overstreet <kmo@daterainc.com> | 2014-01-08 13:05:07 -0800 |
| commit | d56d000a1f424aa77538bd5aad18b43037ed20cc (patch) | |
| tree | 77a303f11e2462546f0e621fa9a5a4d840d23dba /drivers/md | |
| parent | b0f32a56f27eb0df4124dbfc8eb6f09f423eed99 (diff) | |
| download | linux-d56d000a1f424aa77538bd5aad18b43037ed20cc.tar.gz linux-d56d000a1f424aa77538bd5aad18b43037ed20cc.tar.bz2 linux-d56d000a1f424aa77538bd5aad18b43037ed20cc.zip | |
bcache: Don't touch bucket gen for dirty ptrs
Unnecessary since a bucket that has dirty pointers pointing to it can
never be invalidated - and skipping it is a measurable performance
boost, since the bucket gen will usually be a cache miss.
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/bcache/bset.c | 6 | ||||
| -rw-r--r-- | drivers/md/bcache/request.c | 3 |
2 files changed, 7 insertions, 2 deletions
diff --git a/drivers/md/bcache/bset.c b/drivers/md/bcache/bset.c index 16958704af3b..e51a739f7514 100644 --- a/drivers/md/bcache/bset.c +++ b/drivers/md/bcache/bset.c @@ -176,10 +176,14 @@ bool bch_ptr_bad(struct btree *b, const struct bkey *k) bch_ptr_invalid(b, k)) return true; - for (i = 0; i < KEY_PTRS(k); i++) { + for (i = 0; i < KEY_PTRS(k); i++) if (!ptr_available(b->c, k, i)) return true; + if (!expensive_debug_checks(b->c) && KEY_DIRTY(k)) + return false; + + for (i = 0; i < KEY_PTRS(k); i++) { g = PTR_BUCKET(b->c, k, i); stale = ptr_stale(b->c, k, i); diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c index 5878cdb39529..59b3d6df100b 100644 --- a/drivers/md/bcache/request.c +++ b/drivers/md/bcache/request.c @@ -630,7 +630,8 @@ static void bch_cache_read_endio(struct bio *bio, int error) if (error) s->iop.error = error; - else if (ptr_stale(s->iop.c, &b->key, 0)) { + else if (!KEY_DIRTY(&b->key) && + ptr_stale(s->iop.c, &b->key, 0)) { atomic_long_inc(&s->iop.c->cache_read_races); s->iop.error = -EINTR; } |