On Wed, 10 Sep 2025 14:10:37 +0200, Johannes Berg wrote: > On Sun, 2025-08-10 at 13:51 +0800, Tiwei Bie wrote: > > From: Tiwei Bie <tiwei....@antgroup.com> > > > > With SMP and NO_HZ enabled, the CPU may still need to sleep even > > if the timer is disarmed. Switch to deciding whether to sleep based > > on pending resched. This is a preparation for adding SMP support. > > What's the rationale for need_resched()? Is that somehow defined for > this? Is it what other architectures use? I guess I'm just not entirely > sure what it means.
Here is a relevant document: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/scheduler/sched-arch.rst?h=v6.17-rc5#n37 There is a similar check on x86: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/kernel/process.c?h=v6.17-rc5#n916 Regards, Tiwei
