Re: [RFC] sched: make callers check lock contention for cond_resched_lock()

Peter Zijlstra
2012-05-03T12:29:10Z

On Thu, 2012-05-03 at 21:22 +0900, Takuya Yoshikawa wrote:
> Although the real use case is out of this RFC patch, we are now discussing
> a case in which we may hold a spin_lock for long time, ms order, depending
> on workload; and in that case, other threads -- VCPU threads -- should be
> given higher priority for that problematic lock.

Firstly, if you can hold a lock that long, it shouldn't be a spinlock,
secondly why isn't TIF_RESCHED being set if its running that long? That
should still make cond_resched_lock() break.