https://wiki.skytech.dk/index.php?action=history&feed=atom&title=Page_allocation_failure._order%3A0%2C_mode%3A0x20Page allocation failure. order:0, mode:0x20 - Revision history2026-07-05T09:36:45ZRevision history for this page on the wikiMediaWiki 1.46.0https://wiki.skytech.dk/index.php?title=Page_allocation_failure._order:0,_mode:0x20&diff=1850&oldid=prevMartin: Created page with "Category:Linux = page allocation failure. order:0, mode:0x20 = If you constantly get errors like the above and stuff like: <pre> java: page allocation failure. order:0, ..."2012-10-25T18:44:19Z<p>Created page with "<a href="/index.php/Category:Linux" title="Category:Linux">Category:Linux</a> = page allocation failure. order:0, mode:0x20 = If you constantly get errors like the above and stuff like: <pre> java: page allocation failure. order:0, ..."</p>
<p><b>New page</b></p><div>[[Category:Linux]]<br />
<br />
= page allocation failure. order:0, mode:0x20 =<br />
If you constantly get errors like the above and stuff like:<br />
<br />
<pre><br />
java: page allocation failure. order:0, mode:0x20<br />
</pre><br />
instead of java: insert any random application.<br />
<br />
Try having a look the <br />
<pre><br />
/proc/sys/vm/min_free_kbytes<br />
</pre> <br />
<br />
value.<br />
<br />
It is the min. value of free memory the kernel will reserve for itself doing sudden [heavy] swapping (more info here: http://www.kernel.org/doc/Documentation/sysctl/vm.txt )<br />
<br />
In our system, a 24gb 8-core intel xeon monster with SAN-disks we were getting this multiple times a day usually killing a random java thread. Sometimes another random program would be terminated though.<br />
<br />
Eventually we adjusted the value from 20000 -> 64000 and the errors went away.<br />
<br />
You can use<br />
<pre><br />
slabtop<br />
</pre><br />
<br />
to get an idea about actual kernel memory usage/distribution.</div>Martin