From c7828731318d3d91400a634afb29edce0083a6cc Mon Sep 17 00:00:00 2001 From: Sasha Levin Date: Wed, 15 Jun 2011 17:33:06 -0400 Subject: [PATCH] kvm tools: Signal only one thread when injecting console interrupts Send signals only to the thread which handles console injection instead of the entire process. This prevents every single thread from having to ignore SIGALRM and will help scaling when running large amount of VCPU threads. Tested-by: Asias He Acked-by: Ingo Molnar Suggested-by: Ingo Molnar Signed-off-by: Sasha Levin Signed-off-by: Pekka Enberg --- kvm.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/kvm.c b/kvm.c index 8874cf9..c400c70 100644 --- a/kvm.c +++ b/kvm.c @@ -28,6 +28,7 @@ #include #include #include +#include #define DEFINE_KVM_EXIT_REASON(reason) [reason] = #reason @@ -529,8 +530,9 @@ void kvm__start_timer(struct kvm *kvm) memset(&sev, 0, sizeof(struct sigevent)); sev.sigev_value.sival_int = 0; - sev.sigev_notify = SIGEV_SIGNAL; + sev.sigev_notify = SIGEV_THREAD_ID; sev.sigev_signo = SIGALRM; + sev._sigev_un._tid = syscall(__NR_gettid); if (timer_create(CLOCK_REALTIME, &sev, &kvm->timerid) < 0) die("timer_create()");