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linux/kernel/events
Peter Zijlstra cd9626e9eb sched/fair: Fix external p->on_rq users
Sean noted that ever since commit 152e11f6df ("sched/fair: Implement
delayed dequeue") KVM's preemption notifiers have started
mis-classifying preemption vs blocking.

Notably p->on_rq is no longer sufficient to determine if a task is
runnable or blocked -- the aforementioned commit introduces tasks that
remain on the runqueue even through they will not run again, and
should be considered blocked for many cases.

Add the task_is_runnable() helper to classify things and audit all
external users of the p->on_rq state. Also add a few comments.

Fixes: 152e11f6df ("sched/fair: Implement delayed dequeue")
Reported-by: Sean Christopherson <seanjc@google.com>
Tested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20241010091843.GK33184@noisy.programming.kicks-ass.net
2024-10-14 09:14:35 +02:00
..
callchain.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
core.c sched/fair: Fix external p->on_rq users 2024-10-14 09:14:35 +02:00
hw_breakpoint_test.c
hw_breakpoint.c perf/hw_breakpoint: Remove arch breakpoint hooks 2023-08-16 23:54:50 +10:00
internal.h perf/aux: Fix AUX buffer serialization 2024-09-04 18:22:56 +02:00
Makefile
ring_buffer.c perf/aux: Fix AUX buffer serialization 2024-09-04 18:22:56 +02:00
uprobes.c uprobes: fix kernel info leak via "[uprobes]" vma 2024-09-30 08:19:11 +09:00