Re: Syslets, Threadlets, generic AIO support, v6

[Jens Axboe <jens.axboe@oracle.com>]

On Thu, May 31 2007, Ingo Molnar wrote:
> 
> * Ingo Molnar <mingo@elte.hu> wrote:
> 
> > (i definitely remember having written code for that too, but i cannot 
> > find that in the archives. hm.) In theory we could avoid _all_ 
> > fd-bitmap overhead as well and use a per-process list/pool of struct 
> > file buffers plus a maximum-fd field as the 'non-linear fd allocator' 
> > (at the price of only deallocating them at process exit time).
> 
> btw., this also allows mostly-lockless fd allocation, which would 
> probably benefit threaded apps too. (we can just recycle it from a 
> per-CPU list of cached fds for that process)

See also:

http://lkml.org/lkml/2006/6/16/144

which originates from a much simpler patch I did to fix performance
regressions in this area for the SLES10 kernel.

-- 
Jens Axboe

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