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<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>LKML: Alan Cox: Re: [PATCH] strict VM overcommit accounting for 2.4.32/2.4.33-pre1</title><link href="/css/message.css" rel="stylesheet" type="text/css" /><link href="/favicon.ico" rel="shortcut icon" /><link rel="canonical" href="/lkml/2005/12/30/212" /><meta name="robots" content="noindex,follow" /></head><body><table border="0" cellpadding="0" cellspacing="0"><tr><td width="180" align="center"><a href="/"><img style="border:0;width:135px;height:32px" src="/images/toprowlk.gif" alt="lkml.org" /></a></td><td width="32">聽</td><td class="nb"><div><a class="nb" href="/lkml/fancy"> [lkml]</a> 聽 <a class="nb" href="/lkml/fancy/2005"> [2005]</a> 聽 <a class="nb" href="/lkml/fancy/2005/12"> [Dec]</a> 聽 <a class="nb" href="/lkml/fancy/2005/12/30"> [30]</a> 聽 <a class="nb" href="/lkml/fancy/last100"> [last100]</a> 聽 <a href="/rss.php"><img src="/images/rss-or.gif" border="0" alt="RSS-feed" /></a></div><div>Views: <a href="/lkml/fancy/2005/12/30/212">[more markup]</a>聽 <a href="/lkml/2005/12/30/212">[less markup]</a>聽 <a class="nb" href="/lkml/mheaders/2005/12/30/212" onclick="this.href='/lkml/headers'+'/2005/12/30/212';">[headers]</a>聽 <a href="/lkml/bounce/2005/12/30/212">[forward]</a>聽 </div></td><td width="32">聽</td></tr><tr><td valign="top"><div class="calendar"></div><div class="threadlist">Messages in this thread</div><ul class="threadlist"><li><a href="/lkml/fancy/2005/12/30/122">Al Boldi</a><ul><li><a href="/lkml/fancy/2005/12/30/123">"Barry K. Nathan"</a><ul><li><a href="/lkml/fancy/2005/12/30/128">Al Boldi</a><ul><li><a href="/lkml/fancy/2005/12/30/138">Willy TARREAU</a></li></ul></li></ul></li><li class="origin"><a href="/lkml/fancy/2005/12/30/243">Alan Cox</a><ul><li><a href="/lkml/fancy/2005/12/30/243">Al Boldi</a><ul><li><a href="/lkml/fancy/2005/12/31/14">Willy Tarreau</a><ul><li><a href="/lkml/fancy/2005/12/31/64">Al Boldi</a></li></ul></li></ul></li></ul></li></ul></li></ul><a href="http://testing.lkml.org/slashdot.php?mid=634971">Complete thread (EXPERIMENTAL)</a></td><td width="32" rowspan="2" class="c" valign="top"><img src="/images/icornerl.gif" width="32" height="32" alt="/" /></td><td class="c" rowspan="2" valign="top" style="padding-top: 1em"><script type="text/javascript"></script><div align="left"><script type="text/javascript" src="https://pagead2.googlesyndication.com/pagead/show_ads.js">聽 </script></div><table><tr><td class="lp">Subject</td><td class="rp">Re: [PATCH] strict VM overcommit accounting for 2.4.32/2.4.33-pre1</td></tr><tr><td class="lp">From</td><td class="rp">Alan Cox <></td></tr><tr><td class="lp">Date</td><td class="rp">Sat, 31 Dec 2005 00:55:02 +0000</td></tr><tr><td colspan="2" align="center"><a href="http://digg.com/submit?phase=2&url=http%3A%2F%2Flkml.org%2Flkml%2F2005%2F12%2F30%2F212&title=Alan%20Cox%3A%20Re%3A%20%5BPATCH%5D%20strict%20VM%20overcommit%20accounting%20for%202.4.32%2F2.4.33-pre1&topic=linux_unix"><img src="/images/digg.png" alt="Digg This" border="0" /></a></td></tr></table>On Gwe, 2005-12-30 at 23:06 +0300, Al Boldi wrote:<br /> <div class="excerpt"><div class="excerpt">+3 - (NEW) paranoid overcommit The total address space commit<br /> + for the system is not permitted to exceed swap. The machine<br /> + will never kill a process accessing pages it has mapped<br /> + except due to a bug (ie report it!)</div><br /> <br /> This one isn't in 2.6, which is critical for a stable system.</div><br /> <br /> Actually it is<br /> <br /> In the 2.4 case we took "50% RAM + swap" as the safe sane world 'never<br /> OOM kill' and to all intents and purposes it works. We also had a 100%<br /> paranoia mode.<br /> <br /> When it was ported to 2.6 (not by me) whoever did it very sensibly made<br /> the percentage tunable and removed "mode 3" since its mode 2 0% ram and<br /> can be set that way.<br /> <br /> Alan<br /> <br /> -<br /> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in<br /> the body of a message to majordomo@vger.kernel.org<br /> More majordomo info at <a href="http://vger.kernel.org/majordomo-info.html">http://vger.kernel.org/majordomo-info.html</a><br /> Please read the FAQ at <a href="http://www.tux.org/lkml/">http://www.tux.org/lkml/</a><br /> <br /> </td><td width="32" rowspan="2" class="c" valign="top"><img src="/images/icornerr.gif" width="32" height="32" alt="\" /></td></tr><tr><td align="right" valign="bottom"><a href="http://www.isp-services.nl"><img src="/images/ispslogo.png" alt="ISP Services" style="border:0; width:160px; height:70px" /></a></td></tr><tr><td align="right" valign="bottom"><a href="http://validator.w3.org/check/referer"><img src="http://www.w3.org/Icons/valid-xhtml10" style="border:0;width:88px;height:31px" alt="Valid XHTML 1.0!" /></a></td><td class="c" valign="bottom" style="padding-bottom: 0px"><img src="/images/bcornerl.gif" width="32" height="32" alt="\" /></td><td class="c">聽</td><td class="c" valign="bottom" style="padding-bottom: 0px"><img src="/images/bcornerr.gif" width="32" height="32" alt="/" /></td></tr><tr><td align="right" valign="top"><a href="http://jigsaw.w3.org/css-validator/check/referer"><img style="border:0;width:88px;height:31px" src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!" /></a></td><td>聽</td><td class="lm">Last update: 2005-12-31 01:55 聽聽 [W:0.323 / U:0.875 seconds]<br />漏2003-2005 <a href="http://jasper.es/">Jasper Spaans</a></td><td>聽</td></tr></table></body></html>