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Date: Tue, 20 Apr 2004 22:10:08 +0100
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Subject: limit for mmaping for readfile (Bug #19749)
From: wez@thebrainroom.com ("Wez Furlong")

http://bugs.php.net/bug.php?id=19749

It's been playing on my mind recently that this bug
hasn't been addressed; the problem was how to guess
precisely what limit to set for mmaping when doing
something like readfile().
[note that some comments are missing from the bugdb
for that bug]

Well, we can solve the problem by allowing the
sysadmin to decide, as you can see in my patch
against PHP 5:

http://www.php.net/~wez/mmap-limit.diff

The default limit is 8MB. If the limit is set to 0,
no limit is applied.

This is separate from memory_limit, so PHP could 
potentially use double the default memory amount for a 
short period of time.  This is still better than allowing
it to eat all the RAM when someone decides to readfile()
large media files for example.

--Wez.