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| author | Keith Packard <keithp@keithp.com> | 2016-11-20 20:56:01 -0800 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2016-11-20 20:56:01 -0800 |
| commit | 83cfc271e37f568cb1d821cf6a96750f3ca3854c (patch) | |
| tree | 7e2f2811c3f65d1867067494a054e1e802da2f58 | |
| parent | 4ab6776034aeb9837b30e581526aeda07eebc6fe (diff) | |
altos: Don't wait while idle if trying to minimize interrupt latency
Keeping the scanout running reasonably means keeping interrupt latency
constant, and that requires leaving the CPU running. Don't wait for
interrupts when the system is running in this mode.
Signed-off-by: Keith Packard <keithp@keithp.com>
| -rw-r--r-- | src/kernel/ao_task.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/kernel/ao_task.c b/src/kernel/ao_task.c index e8a092aa..de23ea02 100644 --- a/src/kernel/ao_task.c +++ b/src/kernel/ao_task.c @@ -373,7 +373,11 @@ ao_yield(void) ao_arch_naked_define if (!ao_list_is_empty(&run_queue)) break; /* Wait for interrupts when there's nothing ready */ - ao_arch_wait_interrupt(); + if (ao_task_minimize_latency) { + ao_arch_release_interrupts(); + ao_arch_block_interrupts(); + } else + ao_arch_wait_interrupt(); } ao_cur_task = ao_list_first_entry(&run_queue, struct ao_task, queue); #else |