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<div><span></span>According my test,malloc amount greater than available memory,then invoke the oom-killer.</div><div>#man free </div><div><b style="background-color: rgb(204, 232, 207);">Estimation of how much memory is available for starting new applications, without swapping.</b></div><div><br></div><div><div style="background-color: rgb(204, 232, 207);"> [root@liuxp mywork]# head /proc/meminfo</div><div style="background-color: rgb(204, 232, 207);"> MemTotal: 198101744 kB</div><div style="background-color: rgb(204, 232, 207);"> MemFree: 189303148 kB</div><div style="background-color: rgb(204, 232, 207);"> MemAvailable: 188566732 kB</div></div>
<blockquote style="margin-Top: 0px; margin-Bottom: 0px; margin-Left: 0.5em; margin-Right: inherit"><div><br></div><div><span style="color: rgb(63, 70, 77); font-family: 'Microsoft YaHei UI', Tahoma; font-size: 16px; font-weight: bold; line-height: 24px; background-color: rgb(219, 226, 232);">Set safety margin to larger value, may be not sensible.</span></div><div><br></div><div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"><div style="PADDING-RIGHT: 8px; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-FAMILY:tahoma;COLOR:#000000; BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDING-TOP: 8px"><div><b>From:</b> <a href="mailto:chrubis@suse.cz">Cyril Hrubis</a></div><div><b>Date:</b> 2021-01-27 20:03</div><div><b>To:</b> <a href="mailto:mdoucha@suse.cz">Martin Doucha</a></div><div><b>CC:</b> <a href="mailto:liuxp11@chinatelecom.cn">liuxp11</a>; <a href="mailto:ltp@lists.linux.it">ltp</a></div><div><b>Subject:</b> Re: [LTP] [PATCH] Fix tst_pollute_memory() safety margin for huge systems</div></div></div><div><div>Hi!</div>
<div>Actually I've been thinking about this one and since this is a strictly</div>
<div>best effort action I think we should be more aggressive about the safety</div>
<div>margin.</div>
<div> </div>
<div>I also started to talk to kernel developers about this and generally</div>
<div>about tests that try to allocate maximal amount of memory without</div>
<div>triggering OOM since we have a few in the tree. I will send the results</div>
<div>of this discussion once I have any here as well.</div>
<div> </div>
<div>-- </div>
<div>Cyril Hrubis</div>
<div>chrubis@suse.cz</div>
</div></blockquote>
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