diff options
Diffstat (limited to 'src/kernel/ao_sample_profile.c')
| -rw-r--r-- | src/kernel/ao_sample_profile.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/src/kernel/ao_sample_profile.c b/src/kernel/ao_sample_profile.c new file mode 100644 index 00000000..d3743d12 --- /dev/null +++ b/src/kernel/ao_sample_profile.c @@ -0,0 +1,173 @@ +/* + * Copyright © 2012 Keith Packard <keithp@keithp.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + */ + +#include <ao.h> +#include <ao_sample_profile.h> +#include <ao_task.h> + +#ifndef AO_SAMPLE_PROFILE_LOW_PC +#define AO_SAMPLE_PROFILE_LOW_PC 0x08002000 +#endif + +#ifndef AO_SAMPLE_PROFILE_HIGH_PC +#define AO_SAMPLE_PROFILE_HIGH_PC 0x0800f000 +#endif + +#ifndef AO_SAMPLE_PROFILE_SHIFT +#define AO_SAMPLE_PROFILE_SHIFT 6 +#endif + +#define AO_SAMPLE_PROFILE_RANGE (AO_SAMPLE_PROFILE_HIGH_PC - AO_SAMPLE_PROFILE_LOW_PC) +#define AO_SAMPLE_PROFILE_NUM (AO_SAMPLE_PROFILE_RANGE >> AO_SAMPLE_PROFILE_SHIFT) + +static uint16_t prev_tick; +static uint16_t samples[AO_SAMPLE_PROFILE_NUM]; +static uint8_t missed[AO_SAMPLE_PROFILE_NUM/8]; +static uint16_t max_miss; +static uint32_t task, isr, os, idle; + +extern uint8_t ao_idle_loc; + +void +ao_sample_profile_point(uint32_t pc, uint16_t tick, uint8_t in_isr) +{ + uint16_t delta = tick - prev_tick; + + if (pc < AO_SAMPLE_PROFILE_LOW_PC) + return; + if (pc >= AO_SAMPLE_PROFILE_HIGH_PC) + return; + if (ao_cur_task) { + uint8_t *sp; + int32_t sp_delta; + + asm("mov %0,sp" : "=&r" (sp)); + sp_delta = sp - (uint8_t *) ao_cur_task->stack; + if (-96 < sp_delta && sp_delta < 16) + ao_panic(AO_PANIC_STACK); + } + + if (in_isr) + isr += delta; + else if (ao_cur_task) { + ao_cur_task->ticks += delta; + task += delta; + } else if (pc == (uint32_t) &ao_idle_loc) + idle += delta; + else + os += delta; + + pc -= AO_SAMPLE_PROFILE_LOW_PC; + pc >>= AO_SAMPLE_PROFILE_SHIFT; + samples[pc] += delta; + + if (delta > 1) + missed[pc >> 3] |= (1 << (pc & 7)); + if (delta > max_miss) + max_miss = delta; + prev_tick = tick; +} + +static void +ao_sample_profile_start(void) +{ + prev_tick = ao_sample_profile_timer_start(); +} + +static void +ao_sample_profile_stop(void) +{ + ao_sample_profile_timer_stop(); +} + +static void +ao_sample_profile_dump(void) +{ + uint16_t a; + uint8_t t; + + printf ("task %6d\n", task); + printf ("isr %6d\n", isr); + printf ("os %6d\n", os); + printf ("idle %6d\n", idle); + printf ("irq blocked %d\n", max_miss); + for (t = 0; t < ao_num_tasks; t++) + printf ("task %6d %6d %6d %s\n", + ao_tasks[t]->ticks, + ao_tasks[t]->yields, + ao_tasks[t]->max_run, + ao_tasks[t]->name); + for (a = 0; a < AO_SAMPLE_PROFILE_NUM; a++) { + if (samples[a]) + printf ("%04x %c %u\n", + (a << AO_SAMPLE_PROFILE_SHIFT) + AO_SAMPLE_PROFILE_LOW_PC, + missed[a >> 3] & (1 << (a & 7)) ? '*' : ' ', + samples[a]); + } +} + +static void +ao_sample_profile_clear(void) +{ + int t; + + task = isr = os = idle = 0; + max_miss = 0; + memset(samples, '\0', sizeof (samples)); + memset(missed, '\0', sizeof (missed)); + for (t = 0; t < ao_num_tasks; t++) { + ao_tasks[t]->ticks = 0; + ao_tasks[t]->yields = 0; + ao_tasks[t]->max_run = 0; + } +} + +static void +ao_sample_profile_cmd(void) +{ + ao_cmd_white(); + switch (ao_cmd_lex_c) { + case '1': + ao_sample_profile_start(); + break; + case '0': + ao_sample_profile_stop(); + break; + case 'd': + ao_sample_profile_dump(); + break; + case 'c': + ao_sample_profile_clear(); + break; + default: + ao_cmd_status = ao_cmd_syntax_error; + break; + } +} + +static __code struct ao_cmds ao_sample_profile_cmds[] = { + { ao_sample_profile_cmd, "S <1 start,0 stop, d dump,c clear>\0Sample profile" }, + { 0, NULL } +}; + +void +ao_sample_profile_init(void) +{ + ao_sample_profile_timer_init(); + ao_cmd_register(&ao_sample_profile_cmds[0]); + ao_sample_profile_clear(); +} |