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Thu, 10 May 2007

Kevent strikes back?


Xavier Nicollet has sent me LWN article about yet another round of discussions about event delivery mechanisms in kernel.
After Davide Libenzi started his signalfd/timerfd/*fd patchset after eventfs and kevent, there were quite a bit of discussion about it, and eventually something new called pollfs (I did not follow that threads, since I'm not subscribed to linux-kernel@) appeared and started to fight for the place under the sun. Andrew Morton highlighted that likely eventfs by Davide will be included into 2.6.22, but strange things started to appear here...
Ulrich Drepper, glibc land monarch, said that he opposes against eventfd and similar patchsets because of lack of functionality for high-performance servers (mainly because of absence of special-purpose ring buffer implemented in kevent, there are also words about kevent possibility to carry more information and other small bits) and wants something similar to kevent to go in. Davide seems to be opposed to add such functionality (and actually it is not that simple task with old poll design).
As before - there is no active discussion and support developers for Ulrich's positions, but there are no developers against it too, so likely nothing will be included into mainline in 2.6.22 round.

Frankly, I removed kevent git tree from my machine, but I have backups...
So, I do not know should I dust off kevent patchset for yet another round of (empty as I predict) discussion or just forget it completely.
Let's see if new patchsets will appear in a near future, I will follow LWN kernel line, if nothing will be changed/added I will have a talk with Andrew about needs for this step at all.
We will see...

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