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bcachefs: Don't call local_clock() twice in trans_begin()

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local_clock() is not as cheap as we'd like it to be, alas

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-06-16 18:55:07 -04:00
parent 962210b281
commit f375d6ca58
1 changed files with 5 additions and 2 deletions
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7
fs/bcachefs/btree_iter.c
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@ -2850,6 +2850,7 @@ static noinline void bch2_trans_reset_srcu_lock(struct btree_trans *trans)
u32 bch2_trans_begin(struct btree_trans *trans)
{
struct btree_path *path;
u64 now;
bch2_trans_reset_updates(trans);
@ -2878,13 +2879,16 @@ u32 bch2_trans_begin(struct btree_trans *trans)
path->preserve = false;
}
now = local_clock();
if (!trans->restarted &&
(need_resched() ||
local_clock() - trans->last_begin_time > BTREE_TRANS_MAX_LOCK_HOLD_TIME_NS)) {
now - trans->last_begin_time > BTREE_TRANS_MAX_LOCK_HOLD_TIME_NS)) {
bch2_trans_unlock(trans);
cond_resched();
bch2_trans_relock(trans);
now = local_clock();
}
trans->last_begin_time = now;
if (unlikely(time_after(jiffies, trans->srcu_lock_time + msecs_to_jiffies(10))))
bch2_trans_reset_srcu_lock(trans);
@ -2895,7 +2899,6 @@ u32 bch2_trans_begin(struct btree_trans *trans)
trans->notrace_relock_fail = false;
}
trans->last_begin_time = local_clock();
return trans->restart_count;
}