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Date: Wed, 11 Sep 2002 18:54:47 -0700
From: Andrew Morton <akpm@digeo.com>
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To: Andries Brouwer <aebr@win.tue.nl>
CC: "Hanumanthu. H" <hanumanthu.hanok@wipro.com>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] pid_max hang again...
References: <Pine.LNX.4.33.0209111428280.20725-100000@ccvsbarc.wipro.com> <20020911171934.GA12449@win.tue.nl>
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Andries Brouwer wrote:
> 
> ...
> Again. We have 2^30 = 10^9 pids. In reality there are fewer than 10^4
> processes. So once in 10^5 pid allocations do we make a scan over
> these 10^4 processes,

Inside tasklist_lock?  That's pretty bad from a latency point of
view.  A significant number of users would take the slower common
case to avoid this.
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