* Jan Kiszka <[email protected]> wrote:
> Ingo Molnar pointed out that sending the timer signal to the whole
> process, just blocking it everywhere, is suboptimal with an increasing
> number of threads. QEMU is using this pattern so far.
>
> But Linux provides a (non-portable) way to restrict the signal to a
> single thread: Use SIGEV_THREAD_ID unless we are forced to emulate
> signalfd via an additional thread. That case could theoretically be
> optimized as well, but it doesn't look worth bothering.
Would be nice to mention it in the changelog that the context and
motivation for my remark was a patch sent for tools/kvm/ by Asias He:
kvm tools: Block SIGALRM for vcpu thread using sig_block() helper
Thanks,
Ingo
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