On Wed, Jul 31, 2024 at 10:07:53AM +0800, Jinjie Ruan wrote: > On 2024/6/20 17:00, Jinjie Ruan wrote: > > Enable support for PREEMPT_DYNAMIC on arm32, allowing the preemption model > > to be chosen at boot time. > > > > Similar to arm64, arm32 does not yet use the generic entry code, we must > > define our own `sk_dynamic_irqentry_exit_cond_resched`, which will be > > enabled/disabled by the common code in kernel/sched/core.c. > > > > And arm32 use generic preempt.h, so declare > > `sk_dynamic_irqentry_exit_cond_resched` if the arch do not use generic > > entry. Other architectures which use generic preempt.h but not use generic > > entry can benefit from it. > > > > Test ok with the below cmdline parameters on Qemu versatilepb board: > > `preempt=none` > > `preempt=voluntary` > > `preempt=full` > > > > Update preempt mode with debugfs interface on above Qemu board is also > > tested ok: > > # cd /sys/kernel/debug/sched > > # echo none > preempt > > # echo voluntary > preempt > > # echo full > preempt Do you have a use case for this feature? -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
