diff options
Diffstat (limited to 'kernel/sched/ext.c')
| -rw-r--r-- | kernel/sched/ext.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index 85bb052459ec..b5c87a03f112 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -3712,6 +3712,24 @@ void scx_softlockup(u32 dur_s) } /** + * scx_hardlockup - sched_ext hardlockup handler + * + * A poorly behaving BPF scheduler can trigger hard lockup by e.g. putting + * numerous affinitized tasks in a single queue and directing all CPUs at it. + * Try kicking out the current scheduler in an attempt to recover the system to + * a good state before taking more drastic actions. + */ +bool scx_hardlockup(void) +{ + if (!handle_lockup("hard lockup - CPU %d", smp_processor_id())) + return false; + + printk_deferred(KERN_ERR "sched_ext: Hard lockup - CPU %d, disabling BPF scheduler\n", + smp_processor_id()); + return true; +} + +/** * scx_bypass - [Un]bypass scx_ops and guarantee forward progress * @bypass: true for bypass, false for unbypass * |