Re: Inconsistent RSS on Red Hat 7 but not 6.

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On 07/12/2016 11:58 AM, Todd Rinaldo wrote:
> We keep metrics on our binaries with respect to how much memory
> they take up at startup time. So for instance if you run ./a.pl
> --basemem, it grabs the VmRSS value out of /proc/$$/status and
> exits.
> 
> When we added Red Hat 7 support to our product, we noticed that
> this value was VERY unstable. After much poking, I accidentally
> discovered that this was a side effect of having selinux enabled
> when doing the check.
> 
> When I disable selinux in /etc/selinux/config and reboot, I found
> that ./a.pl --basemem became much more stable.
> 
> I am guessing something changed between Red Hat 6 and 7 which
> caused libselinux to map differently into the address space. I'm
> however not ruling out a libc change. Can anyone shed light on this
> or point me to something that would indicate why? For reference,
> this is libselinux 2.2.2 vs 2.0.94.

Can you provide more details, e.g a reproducer without needing your
particular binaries or a.pl?


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