Messages in this thread | | | Date | Wed, 23 Aug 2006 23:42:20 +0400 | From | Evgeniy Polyakov <> | Subject | Re: [take13 0/3] kevent: Generic event handling mechanism. |
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On Wed, Aug 23, 2006 at 10:56:24PM +0400, Evgeniy Polyakov (johnpol@2ka.mipt.ru) wrote: > > It can be done by selecting special event type, which in turn will reuse > > special fields as length. > > But variable-sized members can not be put into cache and without > > knowledge of it's size it is impossible to put htem into mapped buffer. > > And thinking more about this issue, I can say that I'm again > variable-sized structures - they can not be placed into ring buffer (at > least into simple one), they do not allow allocation from cache, it is > impossible to get them correctly from userspace if there is now exact > knowledge about nature of that events and a lot of other problems. > If one strongly feels that it is required, it is possible to provide > userspace pointer in the ukevent structure, which then can be read in > ->enqueue callback by kernelside (there is similar trick in network > AIO).
I've reread my text - sorry for tons of errors, I use extremely slow GPRS link, so it is almost impossible to return and correct errors using it, I think it is simple to understand what I meant :)
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