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sd-event: try to move each wakeup to the same spot within every 10s
In addition to the same spot within every 1min, every 1s, every 250s
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@ -1379,8 +1379,9 @@ static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) {
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We implement this by waking up everywhere at the same time
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within any given minute if we can, synchronised via the
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perturbation value determined from the boot ID. If we can't,
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then we try to find the same spot in every 1s and then 250ms
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step. Otherwise, we pick the last possible time to wake up.
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then we try to find the same spot in every 10s, then 1s and
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then 250ms step. Otherwise, we pick the last possible time
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to wake up.
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*/
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c = (b / USEC_PER_MINUTE) * USEC_PER_MINUTE + e->perturb;
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@ -1391,6 +1392,17 @@ static usec_t sleep_between(sd_event *e, usec_t a, usec_t b) {
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c -= USEC_PER_MINUTE;
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}
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if (c >= a)
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return c;
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c = (b / (USEC_PER_SEC*10)) * (USEC_PER_SEC*10) + (e->perturb % (USEC_PER_SEC*10));
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if (c >= b) {
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if (_unlikely_(c < USEC_PER_SEC*10))
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return b;
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c -= USEC_PER_SEC*10;
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}
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if (c >= a)
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return c;
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