Messages in this thread | | | Date | Tue, 23 Jun 2009 13:59:07 -0700 (PDT) | From | Davide Libenzi <> | Subject | Re: [patch] eventfd - revised interface and cleanups (2nd rev) |
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On Tue, 23 Jun 2009, Andrew Morton wrote:
> On Tue, 23 Jun 2009 12:25:36 -0700 (PDT) > Davide Libenzi <davidel@xmailserver.org> wrote: > > > Another cleanup this patch does, is making AIO select EVENTFD, instead of > > adding a bunch of empty function stubs inside eventfd.h in order to > > handle the (AIO && !EVENTFD) case. > > Given that we're trying to squeak this patch into 2.6.31, it's quite > unfortunate to include unrelated changes. Especially ones which > involve the always-problematic "select". Although this one looks less > than usually deadly due to the simple dependencies of AIO and eventfd. > > However... > > Is this a good way of fixing the (AIO && !EVENTFD) case? Surely if the > developer selected this combination, he doesn't want to carry the > overhead of including eventfd. IOW, if AIO can work acceptably without > eventfd being compiled into the kernel then adding the stubs is a > superior solution.
IMO when someone says "AIO included in the kernel", should get the whole AIO functionality and not part of it. People already started using KAIO+eventfd, and a (AIO && !EVENTFD) config will make their code fail.
- Davide
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