Evgeniy Polyakov wrote:
Mmap ring buffer implementation was stopped by Andrew Morton and Ulrich
Drepper, process' memory is used instead. copy_to_user() is slower (and
some times noticebly), but there are major advantages of such approach.
hmmmm. I say there are advantages to both.
Perhaps create a "kevent_direct_limit" resource limit for each thread.
By default, each thread could mmap $n pinned pagecache pages. Sysadmin
can tune certain app resource limits to permit more.
I would think that retaining the option to avoid copy_to_user()
-somehow- in -some- cases would be wise.
Jeff
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