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Jungwoo,<br>
<br>
I forwarded the webrev to the runtime mailing list and got this<br>
back. In case you are not on that mailing list, here it is.<br>
<br>
Jon<br>
<div class="moz-forward-container"><br>
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">Subject:
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<td>Re: Better default for ParallelGCThreads and
ConcGCThreads by using number of physical cores and CPU
mask.</td>
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">Date: </th>
<td>Fri, 22 Nov 2013 09:58:18 -0800</td>
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">From: </th>
<td>Brandon Mitchell <a class="moz-txt-link-rfc2396E" href="mailto:brandon@twitter.com"><brandon@twitter.com></a></td>
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">To: </th>
<td>Jon Masamitsu <a class="moz-txt-link-rfc2396E" href="mailto:jon.masamitsu@oracle.com"><jon.masamitsu@oracle.com></a></td>
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<th nowrap="nowrap" valign="BASELINE" align="RIGHT">CC: </th>
<td><a class="moz-txt-link-abbreviated" href="mailto:hotspot-runtime-dev@openjdk.java.net">hotspot-runtime-dev@openjdk.java.net</a></td>
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<div dir="ltr">On Fri, Nov 22, 2013 at 9:24 AM, Jon Masamitsu <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:jon.masamitsu@oracle.com" target="_blank">jon.masamitsu@oracle.com</a>></span>
wrote:<br>
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<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF"> This is a
contribution regarding the number of GC worker threads
to<br>
use. Part of the change queries /proc on linux to get
the number of <br>
active cores on the platform. The changes are in<br>
<br>
<a moz-do-not-send="true"
href="http://cr.openjdk.java.net/%7Ejmasa/8028554/webrev.00/hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.cpp.frames.html"
target="_blank">http://cr.openjdk.java.net/~jmasa/8028554/webrev.00/hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.cpp.frames.html</a><br>
<br>
Can someone familiar with this code take a look to see<br>
if it is reasonable and done in a way that is consistent<br>
with other /proc queries.<br>
</div>
</blockquote>
<div><br>
</div>
<div>/sys/devices/system/cpu/cpu<N>/topology/thread_siblings_list
might be somewhat easier to parse for this information.</div>
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