diff options
| -rw-r--r-- | sys/mips/mips/tick.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/sys/mips/mips/tick.c b/sys/mips/mips/tick.c index 51270b4..5432c42 100644 --- a/sys/mips/mips/tick.c +++ b/sys/mips/mips/tick.c @@ -127,9 +127,6 @@ void mips_timer_init_params(uint64_t platform_counter_freq, int double_count) { - stathz = hz; - profhz = hz; - /* * XXX: Do not use printf here: uart code 8250 may use DELAY so this * function should be called before cninit. @@ -143,6 +140,17 @@ mips_timer_init_params(uint64_t platform_counter_freq, int double_count) if (double_count != 0) counter_freq /= 2; + /* + * We want to run stathz in the neighborhood of 128hz. We would + * like profhz to run as often as possible, so we let it run on + * each clock tick. We try to honor the requested 'hz' value as + * much as possible. + * + * If 'hz' is above 1500, then we just let the timer + * (and profhz) run at hz. If 'hz' is below 1500 but above + * 750, then we let the timer run at 2 * 'hz'. If 'hz' + * is below 750 then we let the timer run at 4 * 'hz'. + */ if (hz >= 1500) timer1hz = hz; else if (hz >= 750) @@ -150,6 +158,12 @@ mips_timer_init_params(uint64_t platform_counter_freq, int double_count) else timer1hz = hz * 4; + if (timer1hz < 128) + stathz = timer1hz; + else + stathz = timer1hz / (timer1hz / 128); + profhz = timer1hz; + cycles_per_tick = counter_freq / timer1hz; cycles_per_usec = counter_freq / (1 * 1000 * 1000); @@ -285,7 +299,6 @@ clock_intr(void *arg) while (lost_ticks >= cycles_per_tick) { timer1clock(TRAPF_USERMODE(tf), tf->pc); - timer2clock(TRAPF_USERMODE(tf), tf->pc); lost_ticks -= cycles_per_tick; } DPCPU_SET(lost_ticks, lost_ticks); @@ -301,7 +314,6 @@ clock_intr(void *arg) (*cyclic_clock_func[cpu])(tf); #endif timer1clock(TRAPF_USERMODE(tf), tf->pc); - timer2clock(TRAPF_USERMODE(tf), tf->pc); critical_exit(); return (FILTER_HANDLED); } |
