[stgt] [PATCH 1/2] add signalfd support
fujita.tomonori at lab.ntt.co.jp
Wed Sep 9 13:29:22 CEST 2009
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).
> 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?
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