Messages in this thread | | | Date | Fri, 27 Aug 2010 01:02:09 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCH] hrtimer: make epoll_wait() use the hrtimer range feature |
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On Thu, 26 Aug 2010, Davide Libenzi wrote: > On Sun, 8 Aug 2010, Shawn Bohrer wrote: > > > This make epoll use hrtimers for the timeout value which prevents > > epoll_wait() from timing out up to a millisecond early. > > > > This mirrors the behavior of select() and poll(). > > I saw this now, since I got notifications from Andrew's patch machine. > Is this really needed?
Yes, as it is the last user space interface which is jiffies based.
> Is that really worth the extra code in the fast path?
It's not that much overhead and we had no complaints when we converted everything else
> Aren't we breaking existing behavior?
We had no problems when we moved all the other interfaces over
> I have some doubts.
/me not - though I need to look at the patch itself
Thanks,
tglx
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