From: Mark_H_Johnson@Raytheon.com
To: hahn@coffee.psychology.mcmaster.ca
Cc: linux-mm@kvack.org, Wichert Akkerman <wichert@cistron.nl>
Subject: Re: Running out of memory in 1 easy step
Date: Fri, 15 Sep 2000 08:22:48 -0500 [thread overview]
Message-ID: <OF197FE829.51802B4B-ON8625695B.0048CCDB@hou.us.ray.com> (raw)
I hate to ask, but where is this behavior described? I can't find any hint
of this behavior in the man page. I'm concerned because we would not have
taken the "guard pages" into account when sizing our application's memory
usage. We have a real time application where we will also lock the pages
into memory - running out of physical memory in this case is "very bad".
Thanks.
--Mark H Johnson
<mailto:Mark_H_Johnson@raytheon.com>
Mark Hahn
<hahn@coffee.psychology.mc To: Wichert Akkerman <wichert@cistron.nl>
master.ca> cc: linux-mm@kvack.org, (bcc: Mark H Johnson/RTS/Raytheon/US)
Subject: Re: Running out of memory in 1 easy step
09/14/00 06:03 PM
> Not likely, there were still a couple hundreds of megabytes free and
> the process had allocated about 1.5Gb of data.
mmaping 1 to 4096 bytes consumes 8K from your address space:
one for the mmaped page, and one (virtual) guard page (unless
you use MAP_FIXED, of course.) 4G / 8K is approximately the 458878
you reported. actually, since maps begin at 1G, I would have
expected you to run out sooner...
regards, mark hahn.
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next reply other threads:[~2000-09-15 13:22 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-09-15 13:22 Mark_H_Johnson [this message]
2000-09-15 16:35 ` Mark Hahn
-- strict thread matches above, loose matches on Subject: below --
2000-09-15 16:53 Mark_H_Johnson
2000-09-14 12:59 Wichert Akkerman
2000-09-14 15:56 ` Andi Kleen
2000-09-14 16:08 ` Wichert Akkerman
2000-09-14 18:43 ` Andi Kleen
2000-09-14 19:20 ` Wichert Akkerman
2000-09-14 23:03 ` Mark Hahn
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