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SubjectRe: "Read my lips: no more merges" - aka Linux 2.6.14-rc1
On Tue, Sep 13, 2005 at 09:04:32AM +0200, Eric Dumazet wrote:
> 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.

The overhead is easy to avoid by making use of dup2() and close() to keep
the lowest file descriptors in the table free, allowing open() and socket()
to always return 3 or 4.

Alternatively, the kernel could track available file descriptors using a
tree to efficiently insert freed slots into an ordered list of free
regions (something similar to the avl tree used in vmas). Is it worth

"Time is what keeps everything from happening all at once." -- John Wheeler
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