diff options
author | Kent Overstreet <kent.overstreet@gmail.com> | 2022-08-21 23:08:53 -0400 |
---|---|---|
committer | Kent Overstreet <kent.overstreet@linux.dev> | 2022-10-03 23:52:57 -0400 |
commit | dfdfd3543da65ad3f67459e11c89f376021ab9e2 (patch) | |
tree | 0490912efb38adb53d2e6fd37afd515656b54c44 | |
parent | a56778bc181dd6e5e26c83d8af8ee845635ed04e (diff) |
six locks: Improve six_lock_count
six_lock_count now counts up whether a write lock held, and this patch
now also correctly counts six_lock->intent_lock_recurse.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
-rw-r--r-- | fs/bcachefs/btree_locking.c | 12 | ||||
-rw-r--r-- | include/linux/six.h | 3 | ||||
-rw-r--r-- | include/trace/events/bcachefs.h | 8 | ||||
-rw-r--r-- | kernel/locking/six.c | 10 |
4 files changed, 20 insertions, 13 deletions
diff --git a/fs/bcachefs/btree_locking.c b/fs/bcachefs/btree_locking.c index 69e20140f91f..962f40c0b192 100644 --- a/fs/bcachefs/btree_locking.c +++ b/fs/bcachefs/btree_locking.c @@ -22,15 +22,19 @@ struct six_lock_count bch2_btree_node_lock_counts(struct btree_trans *trans, unsigned level) { struct btree_path *path; - struct six_lock_count ret = { 0, 0 }; + struct six_lock_count ret; + + memset(&ret, 0, sizeof(ret)); if (IS_ERR_OR_NULL(b)) return ret; trans_for_each_path(trans, path) if (path != skip && path->l[level].b == b) { - ret.read += btree_node_read_locked(path, level); - ret.intent += btree_node_intent_locked(path, level); + int t = btree_node_locked_type(path, level); + + if (t != BTREE_NODE_UNLOCKED) + ret.n[t]++; } return ret; @@ -48,7 +52,7 @@ void bch2_btree_node_unlock_write(struct btree_trans *trans, void __bch2_btree_node_lock_write(struct btree_trans *trans, struct btree *b) { - int readers = bch2_btree_node_lock_counts(trans, NULL, b, b->c.level).read; + int readers = bch2_btree_node_lock_counts(trans, NULL, b, b->c.level).n[SIX_LOCK_read]; /* * Must drop our read locks before calling six_lock_write() - diff --git a/include/linux/six.h b/include/linux/six.h index 41ddf63b7470..52e668cb7be9 100644 --- a/include/linux/six.h +++ b/include/linux/six.h @@ -201,8 +201,7 @@ void six_lock_pcpu_free(struct six_lock *); void six_lock_pcpu_alloc(struct six_lock *); struct six_lock_count { - unsigned read; - unsigned intent; + unsigned n[3]; }; struct six_lock_count six_lock_counts(struct six_lock *); diff --git a/include/trace/events/bcachefs.h b/include/trace/events/bcachefs.h index 32ea634f02a0..deaca44e7378 100644 --- a/include/trace/events/bcachefs.h +++ b/include/trace/events/bcachefs.h @@ -453,11 +453,11 @@ TRACE_EVENT(btree_node_upgrade_fail, __entry->locked = btree_node_locked(path, level); c = bch2_btree_node_lock_counts(trans, NULL, path->l[level].b, level), - __entry->self_read_count = c.read; - __entry->self_intent_count = c.intent; + __entry->self_read_count = c.n[SIX_LOCK_read]; + __entry->self_intent_count = c.n[SIX_LOCK_intent]; c = six_lock_counts(&path->l[level].b->c.lock); - __entry->read_count = c.read; - __entry->intent_count = c.intent; + __entry->read_count = c.n[SIX_LOCK_read]; + __entry->intent_count = c.n[SIX_LOCK_read]; ), TP_printk("%s %pS btree %s pos %llu:%llu:%u, locked %u held %u:%u lock count %u:%u", diff --git a/kernel/locking/six.c b/kernel/locking/six.c index 5b2d92c6e91c..4350ed408fe9 100644 --- a/kernel/locking/six.c +++ b/kernel/locking/six.c @@ -763,15 +763,19 @@ EXPORT_SYMBOL_GPL(six_lock_pcpu_alloc); */ struct six_lock_count six_lock_counts(struct six_lock *lock) { - struct six_lock_count ret = { 0, lock->state.intent_lock }; + struct six_lock_count ret; + + ret.n[SIX_LOCK_read] = 0; + ret.n[SIX_LOCK_intent] = lock->state.intent_lock + lock->intent_lock_recurse; + ret.n[SIX_LOCK_write] = lock->state.seq & 1; if (!lock->readers) - ret.read += lock->state.read_lock; + ret.n[SIX_LOCK_read] += lock->state.read_lock; else { int cpu; for_each_possible_cpu(cpu) - ret.read += *per_cpu_ptr(lock->readers, cpu); + ret.n[SIX_LOCK_read] += *per_cpu_ptr(lock->readers, cpu); } return ret; |