[LTP] [PATCH] Fix tst_pollute_memory() safety margin for huge systems

[liuxp11@chinatelecom.cn]

According my test,malloc amount greater than available memory,then invoke the oom-killer.
#man free  
Estimation of how much memory is available for starting new applications, without swapping.

    [root@liuxp mywork]# head /proc/meminfo
    MemTotal:       198101744 kB
    MemFree:        189303148 kB
    MemAvailable:   188566732 kB

Set safety margin to larger value, may be not sensible.

From: Cyril Hrubis
Date: 2021-01-27 20:03
To: Martin Doucha
CC: liuxp11; ltp
Subject: Re: [LTP] [PATCH] Fix tst_pollute_memory() safety margin for huge systems
Hi!
Actually I've been thinking about this one and since this is a strictly
best effort action I think we should be more aggressive about the safety
margin.
 
I also started to talk to kernel developers about this and generally
about tests that try to allocate maximal amount of memory without
triggering OOM since we have a few in the tree. I will send the results
of this discussion once I have any here as well.
 
-- 
Cyril Hrubis
chrubis@suse.cz
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