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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: "Amanulla G": RE: /proc on 2.4.21 & 2.6 kernels....</title><link href="/css/message.css" rel="stylesheet" type="text/css" /><link href="/css/wrap.css" rel="alternate stylesheet" type="text/css" title="wrap" /><link href="/css/nowrap.css" rel="stylesheet" type="text/css" title="nowrap" /><link href="/favicon.ico" rel="shortcut icon" /><script src="/js/simple-calendar.js" type="text/javascript"></script><script src="/js/styleswitcher.js" type="text/javascript"></script><link rel="alternate" type="application/rss+xml" title="lkml.org : last 100 messages" href="/rss.php" /><link rel="alternate" type="application/rss+xml" title="lkml.org : last messages by "Amanulla G"" href="/groupie.php?aid=28640" /><script> var _paq = window._paq = window._paq || []; /* tracker methods like "setCustomDimension" should be called before "trackPageView" */ _paq.push(["setDoNotTrack", true]); _paq.push(["disableCookies"]); _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function() { var u="//m.lkml.org/"; _paq.push(['setTrackerUrl', u+'matomo.php']); _paq.push(['setSiteId', '1']); var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0]; g.async=true; g.src=u+'matomo.js'; s.parentNode.insertBefore(g,s); })(); </script></head><body onload="es.jasper.simpleCalendar.init();" itemscope="itemscope" itemtype="http://schema.org/BlogPosting"><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"> [lkml]</a> 聽 <a class="nb" href="/lkml/2005"> [2005]</a> 聽 <a class="nb" href="/lkml/2005/5"> [May]</a> 聽 <a class="nb" href="/lkml/2005/5/3"> [3]</a> 聽 <a class="nb" href="/lkml/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="#" class="nowrap" onclick="setActiveStyleSheet('wrap');return false;">[wrap]</a><a href="#" class="wrap" onclick="setActiveStyleSheet('nowrap');return false;">[no wrap]</a> 聽 <a class="nb" href="/lkml/mheaders/2005/5/3/128" onclick="this.href='/lkml/headers'+'/2005/5/3/128';">[headers]</a>聽 <a href="/lkml/bounce/2005/5/3/128">[forward]</a>聽 </div></td><td width="32">聽</td></tr><tr><td valign="top"><div class="es-jasper-simpleCalendar" baseurl="/lkml/"></div><div class="threadlist">Messages in this thread</div><ul class="threadlist"><li class="root"><a href="/lkml/2005/4/5/178">First message in thread</a></li><li><a href="/lkml/2005/4/5/206">"Amanulla G"</a><ul><li><a href="/lkml/2005/4/5/209">Arjan van de Ven</a><ul><li class="origin"><a href="">"Amanulla G"</a></li></ul></li></ul></li></ul></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"><table><tr><td><table><tr><td class="lp">From</td><td class="rp" itemprop="author">"Amanulla G" <></td></tr><tr><td class="lp">Subject</td><td class="rp" itemprop="name">RE: /proc on 2.4.21 & 2.6 kernels....</td></tr><tr><td class="lp">Date</td><td class="rp" itemprop="datePublished">Wed, 4 May 2005 00:05:44 +0530</td></tr></table></td><td></td></tr></table><pre itemprop="articleBody">Hi, <br />Sorry for the late follow up on this.<br /><br />Re:<br />>> My second part of question was:<br />>> On 2.6 kernels, we have /proc/<tgid>/task/xxx <br />>> My question is /proc/<tgid> stats reflect resource utilization of the<br />>> threads it has created? <br /><br />> yes afaik it's cumulative over the threads there.<br /><br /><br />I just wrote a small program which creates a thread. The thread just hogs<br />cpu and does nothing else.<br /><br />***********************************************<br />#include <pthread.h><br />#include <stdio.h><br />void *foo(void *p)<br />{<br /> printf ("Thread ");<br /> fflush(stdout);<br /> while (1);<br />}<br />int main(void){<br /> int ret;<br /> pthread_t p1 ;<br /> ret = pthread_create(&p1, NULL, foo, NULL);<br /> pthread_join(p1,NULL);<br />} <br />***********************************************<br /><br />I checked the above program on a machine with 2.6.9-5.EL running.<br /><br />I checked the top output, it says, global cpu util is 99.% but the cpu<br />utilization of a.out is 0.0!!<br /><br />None of the processes that top showed has had more than 0.2% of CPU<br />utilization, but still global cpu utilization is 99.9%.<br />Interestingly, /proc/pid related to a.out process had two entries under<br />/proc/pid/task directory<br />1) Entry related to a.out<br />2) Entry related to thread created by a.out<br /><br />But the statistics under /proc/pid/stat related to a.out process do not<br />reflect the resource utilization of the thread it has created. <br /><br />Could you please look into this issue? <br /><br />With Best Regards,<br />Amanulla<br /><br /><br /><br /><br />-----Original Message-----<br />From: Arjan van de Ven [mailto:arjan@infradead.org] <br />Sent: Tuesday, April 05, 2005 10:05 PM<br />To: Amanulla G<br />Cc: linux-kernel@vger.kernel.org; jdp@india.hp.com<br />Subject: RE: /proc on 2.4.21 & 2.6 kernels....<br /><br />On Tue, 2005-04-05 at 21:52 +0530, Amanulla G wrote:<br />> Hi, <br />> Thanks for the mail.<br />> May be I didn't put my question correctly.<br />> On 2.4.21 based kernels /proc has got hidden directories which has got the<br />> thread related statistics.<br /><br />I understood your question. <br />However 2.4.21 kernels from kernel.org do not have such hidden<br />directories.<br /><br />> My second part of question was:<br />> On 2.6 kernels, we have /proc/<tgid>/task/xxx <br />> My question is /proc/<tgid> stats reflect resource utilization of the<br />> threads it has created? <br /><br />yes afaik it's cumulative over the threads there.<br /><br /><br /><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 /></pre></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"> 聽 </td></tr><tr><td align="right" valign="bottom">聽</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" colspan="2"> 聽 </td><td class="lm">Last update: 2005-05-03 20:44 聽聽 [from the cache]<br />漏2003-2020 <a href="http://blog.jasper.es/"><span itemprop="editor">Jasper Spaans</span></a>|hosted at <a href="https://www.digitalocean.com/?refcode=9a8e99d24cf9">Digital Ocean</a> and my Meterkast|<a href="http://blog.jasper.es/categories.html#lkml-ref">Read the blog</a></td><td>聽</td></tr></table><script language="javascript" src="/js/styleswitcher.js" type="text/javascript"></script></body></html>