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SubjectRe: [patch-2.4.0-test12-pre5] optimized get_empty_filp()

[Tigran Aivazian]
> The only reason one could think of was to "hold the lock for as short
> time as possible" but a minute's thought reveals that such reason is
> invalid (i.e. one is more likely to waste time spinning on the lock
> than to save it by dropping/retaking it, given the relative duration
> of the instructions we execute there without the lock).

If there is no contention, you do not spin, no time wasted

If there *is* contention, you deserialize the routine just a little
bit, which is generally a Good Thing.

Whether a memset of 92 bytes (on 32-bit arch), plus an atomic_set(),
are worth deserializing, I do not know.

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