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Re: [Qemu-devel] [PATCH v2] Register Linux dyntick timer as per-thread s
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From: |
Richard Henderson |
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Subject: |
Re: [Qemu-devel] [PATCH v2] Register Linux dyntick timer as per-thread signal |
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Date: |
Fri, 17 Jun 2011 11:06:49 -0700 |
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User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110428 Fedora/3.1.10-1.fc15 Thunderbird/3.1.10 |
On 06/17/2011 02:25 AM, Jan Kiszka wrote:
> Derived from kvm-tool patch
> http://thread.gmane.org/gmane.comp.emulators.kvm.devel/74309
>
> 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 also using this pattern so far.
>
> Linux provides a (non-portable) way to restrict the signal to a single
> thread: We can 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.
>
> Signed-off-by: Jan Kiszka <address@hidden>
Reviewed-by: Richard Henderson <address@hidden>
r~