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core/service: make restart delay increase more smoothly

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Suggested in https://github.com/systemd/systemd/pull/26902#issuecomment-1620400583.
This commit is contained in:
Yu Watanabe 2023-07-06 12:48:49 +09:00 committed by Lennart Poettering
parent eade959b90
commit ea792cacb9
1 changed files with 10 additions and 4 deletions
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14
src/core/service.c
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@ -294,6 +294,7 @@ usec_t service_restart_usec_next(Service *s) {
if (n_restarts_next <= 1 ||
s->restart_steps == 0 ||
s->restart_usec == 0 ||
s->restart_max_delay_usec == USEC_INFINITY ||
s->restart_usec >= s->restart_max_delay_usec)
value = s->restart_usec;
@ -303,10 +304,15 @@ usec_t service_restart_usec_next(Service *s) {
/* Enforced in service_verify() and above */
assert(s->restart_max_delay_usec > s->restart_usec);
/* ((restart_max_delay_usec - restart_usec)^(1/restart_steps))^(n_restart_next - 1) */
value = usec_add(s->restart_usec,
(usec_t) powl(s->restart_max_delay_usec - s->restart_usec,
(long double) (n_restarts_next - 1) / s->restart_steps));
/* r_i / r_0 = (r_n / r_0) ^ (i / n)
* where,
* r_0 : initial restart usec (s->restart_usec),
* r_i : i-th restart usec (value),
* r_n : maximum restart usec (s->restart_max_delay_usec),
* i : index of the next step (n_restarts_next - 1)
* n : num maximum steps (s->restart_steps) */
value = s->restart_usec * powl((long double) s->restart_max_delay_usec / s->restart_usec,
(long double) (n_restarts_next - 1) / s->restart_steps);
}
log_unit_debug(UNIT(s), "Next restart interval calculated as: %s", FORMAT_TIMESPAN(value, 0));