pid hash question

From: Borislav Deianov (borislav@lix.polytechnique.fr)
Date: Thu Mar 16 2000 - 18:21:15 EST

Hi,

The pid hash function in include/linux/sched.h looks like this:

#define pid_hashfn(x) ((((x) >> 8) ^ (x)) & (PIDHASH_SZ - 1))

What is the point of the >> 8 ? Since pids are assigned linearly (more
or less), wouldn't ((x) & (PIDHASH_SZ - 1)) be just as good?

Thanks,
Borislav

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