Avi Kivity wrote:
Anthony Liguori wrote:
Avi Kivity wrote:
Anthony Liguori wrote:
We don't use signalfd in upstream QEMU. Instead, we always emulate
it.
With an extra thread -> so an extra context switch.
We don't use an extra thread. We just install a signal handler that
writes to a pipe. At best, the added overhead is that we get EINTRs
more often but this is something we already handle.
Oh okay. But signal delivery is slow; for example the FPU needs to be
reset.
Is it really justified to add all of this extra code (including signalfd
emulation) for something that probably isn't even measurable?
I like using wiz-bang features of Linux as much as the next guy, but I
think we're stretching to justify it here :-)
--
Regards,
Anthony Liguori
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