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List:       linux-kernel
Subject:    Re: [Patch] Scale pidhash_shift/pidhash_size up based on num_possible_cpus().
From:       ebiederm () xmission ! com (Eric W !  Biederman)
Date:       2008-07-31 22:04:56
Message-ID: m1bq0d1zhz.fsf () frodo ! ebiederm ! org
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Robin Holt <holt@sgi.com> writes:

> Like so???
>
> I have not tested this yet.

Looks reasonable to me.

In what circumstances was the lookup in the pid hash table with
long changes causing a performance slowdown?.  We don't perform
a lot of lookups.


> -	pidhash_shift = min(12, pidhash_shift);
> +	pidhash_shift = min(fls(PID_MAX_LIMIT) - 6, pidhash_shift);
>  	pidhash_size = 1 << pidhash_shift;
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