Re: [Patch] Scale pidhash_shift/pidhash_size up based on num_possible_cpus().

[Eric W. Biederman]

Robin Holt <holt@xxxxxxx> 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;
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/