* Asias He <asias.hejun@xxxxxxxxx> wrote:
> Signed-off-by: Asias He <asias.hejun@xxxxxxxxx>
> ---
> tools/kvm/kvm-cpu.c | 7 ++-----
> 1 files changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/tools/kvm/kvm-cpu.c b/tools/kvm/kvm-cpu.c
> index 1fb1c74..782a3b2 100644
> --- a/tools/kvm/kvm-cpu.c
> +++ b/tools/kvm/kvm-cpu.c
> @@ -420,12 +420,8 @@ static void kvm_cpu__handle_coalesced_mmio(struct kvm_cpu *cpu)
>
> int kvm_cpu__start(struct kvm_cpu *cpu)
> {
> - sigset_t sigset;
>
> - sigemptyset(&sigset);
> - sigaddset(&sigset, SIGALRM);
> -
> - pthread_sigmask(SIG_BLOCK, &sigset, NULL);
> + sig_block(SIGALRM);
Is there no way to get a signal delivered to only one thread, instead
of trying to broadcast all threads?
Playing with the blocked mask has a performance disadvantage: the
kernel will iterate through all threads of the thread-group to find
the single one that 'can' receive the SIGALRM. This will be a real
scalability issue with 64 or more vcpus.
Thanks,
Ingo
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