Add poll in do_idle. For UP VM, if there are running task, it will not
goes into idle path, so we only enable poll in SMP VM.
Signed-off-by: Yang Zhang <yang.zhang...@gmail.com>
Signed-off-by: Quan Xu <quan....@gmail.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: "H. Peter Anvin" <h...@zytor.com>
Cc: x...@kernel.org
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Borislav Petkov <b...@alien8.de>
Cc: Kyle Huey <m...@kylehuey.com>
Cc: Andy Lutomirski <l...@kernel.org>
Cc: Len Brown <len.br...@intel.com>
Cc: linux-ker...@vger.kernel.org
---
arch/x86/kernel/process.c | 7 +++++++
kernel/sched/idle.c | 2 ++
2 files changed, 9 insertions(+)
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 3ca1980..def4113 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -332,6 +332,13 @@ void arch_cpu_idle(void)
x86_idle();
}
+#if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT)
+void arch_cpu_idle_poll(void)
+{
+ paravirt_idle_poll();
+}
+#endif
+
/*
* We use this if we don't have any better idle routine..
*/
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 6c23e30..b374744 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -74,6 +74,7 @@ static noinline int __cpuidle cpu_idle_poll(void)
}
/* Weak implementations for optional arch specific functions */
+void __weak arch_cpu_idle_poll(void) { }
void __weak arch_cpu_idle_prepare(void) { }
void __weak arch_cpu_idle_enter(void) { }
void __weak arch_cpu_idle_exit(void) { }
@@ -219,6 +220,7 @@ static void do_idle(void)
*/
__current_set_polling();
+ arch_cpu_idle_poll();
quiet_vmstat();
tick_nohz_idle_enter();
--
1.8.3.1
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