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Old 01-14-2013, 03:37 PM   #1
Valery Reznic
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Registered: Oct 2007
Posts: 666

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/proc/sys/vm/mmap_min_addr missing


Recently I stumbled upon some mystery that I can't understand.
My Google search bring no results.

I have 3 VM with different Linuxes that run under QEMU and now I noticed that
all of them don't have /proc/sys/vm/mmap_min_addr files (/proc is mounted)

I am sure that this file was here some time ago.
I didn't recompile kernel in any of those VMs, don't upgrade QEMU - nothing of the sort.

But those VMs where started and stopped multiple times.

So my questions:
1. What happened, where this file gone?
2. How can I get it back?

My host system (Fedora 12, x86-64) has this file.
One of VM is Fedora 12 ARM, another - Fedora Core 3 x86-64, ant yet another ARM OABI debian - all of them miss mmap_min_addr file.

Thank you,
Valery.
 
Old 01-15-2013, 07:12 PM   #2
padeen
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Registered: Sep 2009
Location: Perth, W.A.
Distribution: Slackware 14, Debian 7, FreeBSD, OpenBSD
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From within the VMs, what does 'sysctl vm.mmap_min_addr' show?

Admittedly for Debian, this Debian wiki entry on mmap_min_addr implies that older versions of Qemu needed mmap_min_addr set to zero to work (newer versions are ok). Are you running an older version?

Also, "Fedora qemu mmap_min_addr" throws up a lot of hits showing Fedora did once have an issue with mmap_min_addr set to 0. Are you convinced you remember accurately (not that I'm doubting you, I mis-remember things all the time).
 
Old 01-16-2013, 12:20 AM   #3
Valery Reznic
ELF Statifier author
 
Registered: Oct 2007
Posts: 666

Original Poster
Rep: Reputation: 133Reputation: 133
Quote:
Originally Posted by padeen View Post
From within the VMs, what does 'sysctl vm.mmap_min_addr' show?

Admittedly for Debian, this Debian wiki entry on mmap_min_addr implies that older versions of Qemu needed mmap_min_addr set to zero to work (newer versions are ok). Are you running an older version?

Also, "Fedora qemu mmap_min_addr" throws up a lot of hits showing Fedora did once have an issue with mmap_min_addr set to 0. Are you convinced you remember accurately (not that I'm doubting you, I mis-remember things all the time).
Turns out that you are quite right - I remembered wrong.
Now I boot QEMU with other (Ubuntu's) kernel for ARM and got my mmap_min_addr back.

Thank you anyway
 
  


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