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Re: Thread model

From: olafBuddenhagen
Subject: Re: Thread model
Date: Wed, 19 Mar 2008 22:00:08 +0100
User-agent: Mutt/1.5.17+20080114 (2008-01-14)


On Wed, Mar 19, 2008 at 09:51:16AM -0400, Thomas Bushnell BSG wrote:

> The heap is demand paged virtual memory, for which the kernel must
> maintain memory maps, as Neal was saying.

Well yes; but that's true for any kind of memory allocation -- it's not
at all specific to the problem of having many pending requests...

Also, AIUI the maximal size of these memory maps is more or less
proportional to the amount of virtual memory available, and thus always
bounded; so this doesn't create any additional resource exhaustion
problems. The problem is that an enormous number of requests can simply
overflow the available anonymous memory; the fact that memory maps are
also necessary, doesn't really make it worse.


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