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More optimizations to VTs. 

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@14362 27425a3e-05d8-49a3-a47f-9c15f0e5edd8
This commit is contained in:
Giovanni Di Sirio 2021-05-10 12:32:13 +00:00
parent a16029ba40
commit 9b1eabb208
1 changed files with 42 additions and 11 deletions
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53
os/rt/src/chvt.c
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@ -61,6 +61,39 @@ static inline bool is_timer(ch_delta_list_t *dlhp, ch_delta_list_t *dlp) {
return (bool)(dlp != dlhp);
}
#if 0
/**
* @brief Delta list compression.
*
* @param[in] vtlp pointer to the delta list to be compressed
* @param[in] deltanow interval to be compacted starting from "lasttime"
*
* @notapi
*/
static void vt_list_compress(virtual_timers_list_t *vtlp,
sysinterval_t deltanow) {
ch_delta_list_t *dlp = vtlp->dlist.next;
vtlp->lasttime = chTimeAddX(vtlp->lasttime, deltanow);
/* The loop is bounded because the delta list header has the delta field
set to (sysinterval_t)-1 which is larger than all deltas.*/
while (dlp->delta < deltanow) {
deltanow -= dlp->delta;
dlp->delta = (sysinterval_t)0;
dlp = dlp->next;
}
/* Adjusting next timer in the list, if any.*/
if (is_timer(&vtlp->dlist, dlp)) {
chDbgAssert(deltanow <= dlp->delta, "invalid delta");
dlp->delta -= deltanow;
}
}
#endif
#endif
/**
@ -113,6 +146,7 @@ static void vt_enqueue(virtual_timers_list_t *vtlp,
delta is shortened to make it fit the numeric range, the timer
will be triggered "deltanow" cycles earlier.*/
if (delta < deltanow) {
// vt_list_compress(vtlp, deltanow);
delta = delay;
}
@ -455,22 +489,17 @@ void chVTDoTickI(void) {
vtp->func(vtp, vtp->par);
chSysLockFromISR();
/* Delta between current time and last execution time.*/
/* Delta between current time after callback and last execution time.*/
now = chVTGetSystemTimeX();
nowdelta = chTimeDiffX(vtlp->lasttime, now);
nowdelta = chTimeDiffX(lasttime, now);
/* If a reload is defined the timer needs to be restarted.*/
if (vtp->reload > (sysinterval_t)0) {
sysinterval_t skipped_delta;
/* Calculating how much the actual current time skipped past the
current deadline.*/
skipped_delta = chTimeDiffX(lasttime, now);
chDbgAssert(skipped_delta <= vtp->reload, "skipped deadline");
chDbgAssert(nowdelta <= vtp->reload, "skipped deadline");
/* Enqueuing the timer again using the calculated delta.*/
vt_enqueue(vtlp, vtp, now, vtp->reload - skipped_delta);
vt_enqueue(vtlp, vtp, now, vtp->reload - nowdelta);
}
/* Next element in the list.*/
@ -482,8 +511,10 @@ void chVTDoTickI(void) {
return;
}
/* Recalculating the next alarm time.*/
delta = dlp->delta - chTimeDiffX(vtlp->lasttime, now);
/* Calculating the next alarm time.*/
delta = dlp->delta - nowdelta;
/* For normal timers limit to CH_CFG_ST_TIMEDELTA.*/
if (delta < (sysinterval_t)CH_CFG_ST_TIMEDELTA) {
delta = (sysinterval_t)CH_CFG_ST_TIMEDELTA;
}