diff options
| author | Idan Horowitz <idan.horowitz@gmail.com> | 2022-01-14 02:43:58 +0200 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2022-06-21 09:24:34 -0700 |
| commit | 3f42906c9ab2c777a895b48b87b8107167e4a275 (patch) | |
| tree | cec32653c9fb4186f83926f26fac3489fc815aca /util/qemu-timer.c | |
| parent | 18b8c47f8e66c1c45a0fb59cfd6ed4dfeb25c6f6 (diff) | |
qemu-timer: Skip empty timer lists before locking in qemu_clock_deadline_ns_all
This decreases qemu_clock_deadline_ns_all's share from 23.2% to 13% in a
profile of icount-enabled aarch64-softmmu.
Signed-off-by: Idan Horowitz <idan.horowitz@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220114004358.299534-2-idan.horowitz@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'util/qemu-timer.c')
| -rw-r--r-- | util/qemu-timer.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/util/qemu-timer.c b/util/qemu-timer.c index a670a57881..6a0de33dd2 100644 --- a/util/qemu-timer.c +++ b/util/qemu-timer.c @@ -261,6 +261,9 @@ int64_t qemu_clock_deadline_ns_all(QEMUClockType type, int attr_mask) } QLIST_FOREACH(timer_list, &clock->timerlists, list) { + if (!qatomic_read(&timer_list->active_timers)) { + continue; + } qemu_mutex_lock(&timer_list->active_timers_lock); ts = timer_list->active_timers; /* Skip all external timers */ |