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| author | Peter Zijlstra <peterz@infradead.org> | 2024-10-04 14:47:02 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2024-11-05 12:55:37 +0100 |
| commit | 26baa1f1c4bdc34b8d698c1900b407d863ad0e69 (patch) | |
| tree | 410e81cac79d2f31d7734efc4ac79c3a2003a1d8 /kernel/entry | |
| parent | sched/ext: Remove sched_fork() hack (diff) | |
| download | linux-26baa1f1c4bdc34b8d698c1900b407d863ad0e69.tar.gz linux-26baa1f1c4bdc34b8d698c1900b407d863ad0e69.zip | |
sched: Add TIF_NEED_RESCHED_LAZY infrastructure
Add the basic infrastructure to split the TIF_NEED_RESCHED bit in two.
Either bit will cause a resched on return-to-user, but only
TIF_NEED_RESCHED will drive IRQ preemption.
No behavioural change intended.
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lkml.kernel.org/r/20241007075055.219540785@infradead.org
Diffstat (limited to 'kernel/entry')
| -rw-r--r-- | kernel/entry/common.c | 2 | ||||
| -rw-r--r-- | kernel/entry/kvm.c | 4 |
2 files changed, 3 insertions, 3 deletions
diff --git a/kernel/entry/common.c b/kernel/entry/common.c index 5b6934e23c21..e33691d5adf7 100644 --- a/kernel/entry/common.c +++ b/kernel/entry/common.c @@ -98,7 +98,7 @@ __always_inline unsigned long exit_to_user_mode_loop(struct pt_regs *regs, local_irq_enable_exit_to_user(ti_work); - if (ti_work & _TIF_NEED_RESCHED) + if (ti_work & (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY)) schedule(); if (ti_work & _TIF_UPROBE) diff --git a/kernel/entry/kvm.c b/kernel/entry/kvm.c index 2e0f75bcb7fd..8485f63863af 100644 --- a/kernel/entry/kvm.c +++ b/kernel/entry/kvm.c @@ -13,7 +13,7 @@ static int xfer_to_guest_mode_work(struct kvm_vcpu *vcpu, unsigned long ti_work) return -EINTR; } - if (ti_work & _TIF_NEED_RESCHED) + if (ti_work & (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY)) schedule(); if (ti_work & _TIF_NOTIFY_RESUME) @@ -24,7 +24,7 @@ static int xfer_to_guest_mode_work(struct kvm_vcpu *vcpu, unsigned long ti_work) return ret; ti_work = read_thread_flags(); - } while (ti_work & XFER_TO_GUEST_MODE_WORK || need_resched()); + } while (ti_work & XFER_TO_GUEST_MODE_WORK); return 0; } |