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| author |   Dominik Dingel <dingel@linux.vnet.ibm.com> | 2015-09-18 11:27:45 +0200 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2015-09-18 13:47:59 +0200 |
| commit | 00cc1633816de8c95f337608a1ea64e228faf771 (patch) | |
| tree | e2d7d478433a78a135df3aa575cfad98a34c950a /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | Merge tag 'kvm-arm-for-4.3-rc2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into kvm-master (diff) | |
| download | wireguard-linux-00cc1633816de8c95f337608a1ea64e228faf771.tar.xz wireguard-linux-00cc1633816de8c95f337608a1ea64e228faf771.zip | |
sched: access local runqueue directly in single_task_running
Commit 2ee507c47293 ("sched: Add function single_task_running to let a task
check if it is the only task running on a cpu") referenced the current
runqueue with the smp_processor_id. When CONFIG_DEBUG_PREEMPT is enabled,
that is only allowed if preemption is disabled or the currrent task is
bound to the local cpu (e.g. kernel worker).
With commit f78195129963 ("kvm: add halt_poll_ns module parameter") KVM
calls single_task_running. If CONFIG_DEBUG_PREEMPT is enabled that
generates a lot of kernel messages.
To avoid adding preemption in that cases, as it would limit the usefulness,
we change single_task_running to access directly the cpu local runqueue.
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: <stable@vger.kernel.org>
Fixes: 2ee507c472939db4b146d545352b8a7c79ef47f8
Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions