MAYDAY_INITIAL_TIMEOUT is defined as HZ / 100 and depending on configuration may end up 0 or 1. Even when it's 1, depending on when the mayday timer is added in the current jiffy interval, it may expire way before a jiffy has passed. Make sure MAYDAY_INITIAL_TIMEOUT is at least two to guarantee that at least a full jiffy has passed before calling rescuers.
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| @@ -79,7 +79,9 @@ enum { · 78 unmodified lines | |||
| 79 | MAX_IDLE_WORKERS_RATIO = 4, /* 1/4 of busy can be idle */ | 79 | MAX_IDLE_WORKERS_RATIO = 4, /* 1/4 of busy can be idle */ |
| 80 | IDLE_WORKER_TIMEOUT = 300 * HZ, /* keep idle ones for 5 mins */ | 80 | IDLE_WORKER_TIMEOUT = 300 * HZ, /* keep idle ones for 5 mins */ |
| 81 | 81 | ||
| 82 | MAYDAY_INITIAL_TIMEOUT = HZ / 100, /* call for help after 10ms */ | 82 | MAYDAY_INITIAL_TIMEOUT = HZ / 100 >= 2 ? HZ / 100 : 2, |
| 83 | /* call for help after 10ms | ||
| 84 | (min two ticks) */ | ||
| 83 | MAYDAY_INTERVAL = HZ / 10, /* and then every 100ms */ | 85 | MAYDAY_INTERVAL = HZ / 10, /* and then every 100ms */ |
| 84 | CREATE_COOLDOWN = HZ, /* time to breath after fail */ | 86 | CREATE_COOLDOWN = HZ, /* time to breath after fail */ |
| 85 | TRUSTEE_COOLDOWN = HZ / 10, /* for trustee draining */ | 87 | TRUSTEE_COOLDOWN = HZ / 10, /* for trustee draining */ |