Eric Wong wrote:
> Arve Hjønnevåg wrote:
> >
> > At some point the level triggered event has to get cleared. As far as
> > I can tell, your new code will drop new events that occur between
> > "revents = ep_item_poll(epi, &pt);" and "epi->state = EP_STATE_IDLE;"
> > in that case.
>
> Thanks for
Arve Hjønnevåg wrote:
> On Fri, Mar 22, 2013 at 3:31 AM, Eric Wong wrote:
> > Arve Hjønnevåg wrote:
> >> On Thu, Mar 21, 2013 at 8:24 PM, Eric Wong wrote:
> >> >
> >> > With EPOLLET and improper usage (not hitting EAGAIN), the event now
> >> > has a larger window to be lost (as mentioned in my
On Fri, Mar 22, 2013 at 12:24 PM, Eric Wong wrote:
...
> Perhaps just using epitem->ws and removing ep->ws can work.
>
> I think the following change to keep wakeup_source in sync with
> epi->state is sufficient to prevent suspend.
>
> But I'm not familiar with suspend. Is it possible to suspend
On Fri, Mar 22, 2013 at 3:31 AM, Eric Wong wrote:
> Arve Hjønnevåg wrote:
>> On Thu, Mar 21, 2013 at 8:24 PM, Eric Wong wrote:
>> >
>> > With EPOLLET and improper usage (not hitting EAGAIN), the event now
>> > has a larger window to be lost (as mentioned in my changelog).
>> >
>>
>> What about t
Eric Wong wrote:
> Arve Hjønnevåg wrote:
> > On Thu, Mar 21, 2013 at 8:24 PM, Eric Wong wrote:
> > >
> > > With EPOLLET and improper usage (not hitting EAGAIN), the event now
> > > has a larger window to be lost (as mentioned in my changelog).
> > >
> >
> > What about the case where EPOLLET is
Arve Hjønnevåg wrote:
> On Thu, Mar 21, 2013 at 8:24 PM, Eric Wong wrote:
> >
> > With EPOLLET and improper usage (not hitting EAGAIN), the event now
> > has a larger window to be lost (as mentioned in my changelog).
> >
>
> What about the case where EPOLLET is not set? The old code did not
> dr
On Thu, Mar 21, 2013 at 8:24 PM, Eric Wong wrote:
> Arve Hjønnevåg wrote:
>> On Thu, Mar 21, 2013 at 4:52 AM, Eric Wong wrote:
>> > Changes since v2:
>> > * epi->state is no longer atomic, we only cmpxchg in ep_poll_callback
>> > now and rely on implicit barriers in other places for reading.
>
Arve Hjønnevåg wrote:
> On Thu, Mar 21, 2013 at 4:52 AM, Eric Wong wrote:
> > Changes since v2:
> > * epi->state is no longer atomic, we only cmpxchg in ep_poll_callback
> > now and rely on implicit barriers in other places for reading.
> > * intermediate EP_STATE_DEQUEUE removed, this (with xc
On Thu, Mar 21, 2013 at 4:52 AM, Eric Wong wrote:
> This is still not a proper commit, I've lightly tested this.
>
> Replace the spinlock-protected linked list ready list with wfcqueue.
>
> This improves performance under heavy, multi-threaded workloads with
> multiple threads calling epoll_wait.
Eric Wong wrote:
> This is still not a proper commit, I've lightly tested this.
Btw, full series here (already sent to LKML and some in -mm)
http://yhbt.net/epoll-wfcqueue-v3.8.3-20130321.mbox
(should apply cleanly to all 3.8/3.9 kernels)
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This is still not a proper commit, I've lightly tested this.
Replace the spinlock-protected linked list ready list with wfcqueue.
This improves performance under heavy, multi-threaded workloads with
multiple threads calling epoll_wait.
Using my multi-threaded EPOLLONESHOT microbenchmark, perform
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