Messages in this thread Patch in this message | | | Date | Thu, 12 Jan 2017 02:06:45 -0800 | From | tip-bot for Pan Xinhui <> | Subject | [tip:locking/core] locking/pvqspinlock: Don't wait if vCPU is preempted |
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Commit-ID: 75437bb304b20a2b350b9a8e9f9238d5e24e12ba Gitweb: http://git.kernel.org/tip/75437bb304b20a2b350b9a8e9f9238d5e24e12ba Author: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> AuthorDate: Tue, 10 Jan 2017 02:56:46 -0500 Committer: Ingo Molnar <mingo@kernel.org> CommitDate: Thu, 12 Jan 2017 09:35:57 +0100
locking/pvqspinlock: Don't wait if vCPU is preempted
If prev node is not in running state or its vCPU is preempted, we can give up our vCPU slices in pv_wait_node() ASAP.
Signed-off-by: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: longman@redhat.com Link: http://lkml.kernel.org/r/1484035006-6787-1-git-send-email-xinhui.pan@linux.vnet.ibm.com [ Fixed typos in the changelog, removed ugly linebreak from the code. ] Signed-off-by: Ingo Molnar <mingo@kernel.org> --- kernel/locking/qspinlock_paravirt.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/locking/qspinlock_paravirt.h b/kernel/locking/qspinlock_paravirt.h index e3b5520..e6b2f7a 100644 --- a/kernel/locking/qspinlock_paravirt.h +++ b/kernel/locking/qspinlock_paravirt.h @@ -263,7 +263,7 @@ pv_wait_early(struct pv_node *prev, int loop) if ((loop & PV_PREV_CHECK_MASK) != 0) return false; - return READ_ONCE(prev->state) != vcpu_running; + return READ_ONCE(prev->state) != vcpu_running || vcpu_is_preempted(prev->cpu); } /*
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