[stgt] [PATCH 1/2] add signalfd support

[FUJITA Tomonori]

On Wed, 09 Sep 2009 13:30:44 +0200
Florian Haas <florian.haas at linbit.com> wrote:

> On 09/09/2009 01:29 PM, FUJITA Tomonori wrote:
> > On Wed, 09 Sep 2009 13:17:10 +0200
> > Florian Haas <florian.haas at linbit.com> wrote:
> > 
> >> On 09/09/2009 12:44 PM, FUJITA Tomonori wrote:
> >>> We use threads and pipe for event notification (I/O completion); I/O
> >>> threads signal the main thread when I/Os are complete. signalfd is
> >>> faster than it (signalfd is supported as of 2.6.22).
> >> Tomo-san,
> >>
> >> AFAICS signalfd has not been backported to Red Hat's RHEL 5 kernels. So
> >> if I understand correctly, this patch would break building tgt on that
> >> platform (and presumably others, like Debian etch and SLES 10). Would
> >> you mind employing ifdefs so that when signalfd is not available on the
> >> platform tgt is being built on, it reverts to the old behavior?
> > 
> > This patch works in the old way on a box where signalfd is not
> > supported. I have not try this patch with systems that doesn't support
> > signalfd. Can anyone test this patch on such system?
> 
> I can try and see if it builds. What would I need to look out for when I
> actually use it?

If it works on such system (an initiator connects to it and does
I/Os), then should be ok.

Thanks,
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