Re: "Read my lips: no more merges" - aka Linux 2.6.14-rc1

David S. Miller
2005-09-15T04:06:46Z

From: Eric Dumazet <dada1@cosmosbay.com>
Date: Tue, 13 Sep 2005 09:04:32 +0200

> And if your process has many files opened, the cost (read : latency)
> of open() can be very high, finding a zero bit in a large bit array.
...
> I wish a process param could allow open() to take any free fd
> available, not > the lowest one. One can always use fcntl(fd, F_DUPFD,
> slot) to move a fd on a > specific high slot and always keep the 64
> first fd slots free to speedup the > kernel part at
> open()/dup()/socket() time.

Why not just remember the lowest available free slot and start each
bitmap search there? This is a quite common technique.