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Date: Wed, 18 Sep 2002 13:32:29 -0300 (BRT)
From: Rik van Riel <riel@conectiva.com.br>
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To: Linus Torvalds <torvalds@transmeta.com>
Cc: Andries Brouwer <aebr@win.tue.nl>, Ingo Molnar <mingo@elte.hu>,
       William Lee Irwin III <wli@holomorphy.com>,
       <linux-kernel@vger.kernel.org>
Subject: Re: [patch] lockless, scalable get_pid(), for_each_process()
 elimination, 2.5.35-BK
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On Wed, 18 Sep 2002, Linus Torvalds wrote:

> I would suggest something like this:
>  - make pid_max start out at 32k or whatever, to make "ps" look nice if
>    nothing else.
>  - every time we have _any_ trouble at all with looking up a new pid, we
>    double pid_max.

> +		if (nr_threads > pid_max >> 4)
> +			pid_max <<= 1;

... but watch out for over/underflow.  ;)

It would also be nice if we had some known limit on pid_max (say 8
million, fits in 7 digits).

regards,

Rik
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