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Big thanks again for improving this.<br>
<br>
Tao<br>
<br>
On 8/23/13 4:05 PM, Yumin Qi wrote:
<blockquote cite="mid:5217EAC4.9090001@oracle.com" type="cite">
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Tao,<br>
<br>
Thanks for your review.<br>
<br>
<div class="moz-cite-prefix">On 8/23/2013 3:33 PM, Tao Mao wrote:<br>
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<blockquote cite="mid:5217E333.9020802@oracle.com" type="cite">
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Hi,<br>
<br>
I reviewed most of the code and test-ran a build from it. It's a
very cool and important improvement. <br>
<br>
Thank you for putting together these on our wishlist for long.<br>
<br>
Below are some comments.<br>
<br>
1. src/share/vm/runtime/arguments.cpp<br>
<br>
- 1853 "To enable GC log rotation, use -Xloggc:<filename>
-XX:+UseGCLogFileRotation
-XX:NumberOfGCLogFiles=<num_of_files>
-XX:GCLogFileSize=<num_of_size>[k|K|m|M]\n"<br>
+ 1853 "To enable GC log rotation, use -Xloggc:<filename>
-XX:+UseGCLogFileRotation
-XX:NumberOfGCLogFiles=<num_of_files>
-XX:GCLogFileSize=<num_of_size>[k|K|m|M|g|G]\n"<br>
<br>
Please consider adding [g|G] to GCLogFileSize suggestion.<br>
<br>
I worked on a problem of enabling gc log limit over 2G
(JDK-7122222). So it seems that customers sometimes want gc logs
to be very large.<br>
<br>
</blockquote>
Sure, will add.<br>
</blockquote>
Thank you.<br>
<blockquote cite="mid:5217EAC4.9090001@oracle.com" type="cite">
<blockquote cite="mid:5217E333.9020802@oracle.com" type="cite"> 2.
src/share/vm/runtime/arguments.hpp<br>
<br>
(1) with the current changeset, we only append date&time to
file_name w/ +UseGCLogFileRotation; if not, we won't have
date&time info. <br>
<br>
I think it would be useful to let both cases (w/ and w/o
UseGCLogFileRotation) have date&time in order to solve the
overwritten problem (e.g. JDK-8020667). In fact, having that, we
actually solve JDK-8020667.<br>
<br>
If you want to have that, basically you need to work on the
FileStream constructor methods fileStream().<br>
<br>
</blockquote>
I can change that, if no objection from others. This also will
simplify the setting of file name here.<br>
</blockquote>
Thank you. Let's see if anyone disagrees with a good reason.<br>
<blockquote cite="mid:5217EAC4.9090001@oracle.com" type="cite"> <br>
<blockquote cite="mid:5217E333.9020802@oracle.com" type="cite">
(2) Would it be better to rename method name reformat_filename()
to extend_filename()?<br>
<br>
(3) Typos and suggestion<br>
537 // rotate file in names filename.0, filename.1, ...,
filename.<NumberOfGCLogFiles - 1> <br>
<b>=> extended_filename.0</b><br>
<br>
538 // filename contains pid and time when the fist file
created. The current filename is <br>
<b>=> </b>the<b> first </b>file created.<br>
<br>
539 // gc_log_file_name + pid<pid> +
YYYY-MM-DD_HH-MM-SS.<i>.current, where i is current <br>
540 // rotation file number. After it reaches max file size, the
file will be saved and <br>
541 // renamed with .current removed from its tail.<br>
<br>
</blockquote>
Will change that.<br>
</blockquote>
Thank you.<br>
<blockquote cite="mid:5217EAC4.9090001@oracle.com" type="cite">
<blockquote cite="mid:5217E333.9020802@oracle.com" type="cite"> 3.
For your point 5), I don't quite get it. In my test-run, I tried
to change file permission to unreadable and unwritable, but VM
would later change the permission back anyway.<br>
<br>
So could you bring up some use cases of that functionality to
give more details?<br>
<br>
</blockquote>
Changing file permission will not stop the file create, in this
rotation, the file opened/saved/removed/renamed -> then repeat.
What I have done is change the while directory to read only, then
the create failed so rotation stopped.<br>
<br>
</blockquote>
So, when VM is already running and gc logs are rotating, how should
I make the rotation stop? Let me give one more try.<br>
<blockquote cite="mid:5217EAC4.9090001@oracle.com" type="cite">
<blockquote cite="mid:5217E333.9020802@oracle.com" type="cite"> 4.
Will you write jtreg tests for this functionality? It looks
possible to write some tests, at least checking the format of
log names.<br>
<br>
</blockquote>
Good suggestion, I will add one.<br>
</blockquote>
You may also want to check the number of gc logs created is what we
desire to have, when the Java process is completed.<br>
<br>
The example in the link
(<a class="moz-txt-link-freetext" href="http://stackoverflow.com/questions/5694385/getting-the-filenames-of-all-files-in-a-folder">http://stackoverflow.com/questions/5694385/getting-the-filenames-of-all-files-in-a-folder</a>)
basically describes a routine to list all filenames in a directory.
Hope that helps.<br>
<blockquote cite="mid:5217EAC4.9090001@oracle.com" type="cite"> <br>
<blockquote cite="mid:5217E333.9020802@oracle.com" type="cite">
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Thanks.<br>
Tao<br>
<br>
On 8/23/13 7:53 AM, Yumin Qi wrote:
<blockquote cite="mid:52177780.3040109@oracle.com" type="cite">
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Could I get a GC staff review the change? Need more reviewers
to push this in.<br>
<br>
Thanks<br>
Yumin<br>
<br>
<div class="moz-cite-prefix">On 8/21/2013 3:43 PM, Yumin Qi
wrote:<br>
</div>
<blockquote cite="mid:521542A3.3020906@oracle.com" type="cite">
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Hi, all<br>
<br>
This is second version after feedback from first round.<br>
The changes are:<br>
<br>
1) file name will be based on gc log file name
(-Xloggc:filename), pid (process id) and time when the first
rotation file created:<br>
<filename>-pid<pid>-YYYY-MM-DD_HH-MM-SS<br>
2) If rotate in same file, file name is as in 1), if
rotate in multiple files, .<i> will append to above
file name.<br>
3) every time file rotated, file name and time when file
created will be logged to head/tail, this is same as first
version.<br>
4) current file has name
<filename>-pid<pid>-YYYY-MM-DD_HH-MM-SS.<i>.current<br>
This is similar to first version.<br>
By adapting such name format we will never loss logs
in case apps stops and restart, the log files will not be
overwritten since time stamp in file names.<br>
5) If open file failed, turn off gc log rotation. <br>
If due to some reason, file operation failed (such
as permission changed etc), with log file opened, logging
still works, but at <br>
saving and renaming, the file operation will fail,
this will lead not all files saved.<br>
<br>
<a moz-do-not-send="true"
class="moz-txt-link-freetext"
href="http://cr.openjdk.java.net/%7Eminqi/7164841/webrev01">http://cr.openjdk.java.net/~minqi/7164841/webrev01</a><br>
<br>
Tested with jtreg, JPRT.<br>
<br>
Thanks<br>
Yumin<br>
<br>
<div class="moz-cite-prefix">On 8/15/2013 8:35 AM, Yumin Qi
wrote:<br>
</div>
<blockquote cite="mid:520CF52B.6050000@oracle.com"
type="cite">
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charset=UTF-8">
Hi, <br>
<br>
Can I have your review for this small changes?<br>
<a moz-do-not-send="true"
href="http://cr.openjdk.java.net/%7Eminqi/7164841/webrev00/">http://cr.openjdk.java.net/~minqi/7164841/webrev00/</a><br>
<br>
This is for a enhancement to add head/tail message to
the logging files to assist reading GC output.<br>
1. modified prompt message if invalid arguments used
for log rotating;<br>
2. add time and file name message to log file
head/tail.<br>
3. for easily identify which log file is current, use
file name like <filename>.n.current, after it
reaches maximum size, rename it to <filename>.n<br>
On Windows, there is no F_OK (existing test)
definition, F_OK is defined as "0" and for _access of
VC++, it just describes:<br>
<br>
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<p style="color: rgb(42, 42, 42); margin-top: 0px;
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line-height: 18px;"><span class="parameter"
style="font-style: italic;">mode</span><span
class="Apple-converted-space"> </span>value</p>
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<p style="color: rgb(42, 42, 42); margin-top: 0px;
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line-height: 18px;">Checks file for</p>
</th>
</tr>
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<td style="border: 1px solid rgb(187, 187, 187);
margin: 10px; padding: 10px 8px; color: rgb(42,
42, 42); vertical-align: top;">
<p style="color: rgb(42, 42, 42); margin-top: 0px;
margin-bottom: 0px; padding-bottom: 0px;
line-height: 18px;">00</p>
</td>
<td style="border: 1px solid rgb(187, 187, 187);
margin: 10px; padding: 10px 8px; color: rgb(42,
42, 42); vertical-align: top;">
<p style="color: rgb(42, 42, 42); margin-top: 0px;
margin-bottom: 0px; padding-bottom: 0px;
line-height: 18px;">Existence only</p>
</td>
</tr>
<tr>
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margin: 10px; padding: 10px 8px; color: rgb(42,
42, 42); vertical-align: top;">
<p style="color: rgb(42, 42, 42); margin-top: 0px;
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line-height: 18px;">02</p>
</td>
<td style="border: 1px solid rgb(187, 187, 187);
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42, 42); vertical-align: top;">
<p style="color: rgb(42, 42, 42); margin-top: 0px;
margin-bottom: 0px; padding-bottom: 0px;
line-height: 18px;">Write-only</p>
</td>
</tr>
<tr>
<td style="border: 1px solid rgb(187, 187, 187);
margin: 10px; padding: 10px 8px; color: rgb(42,
42, 42); vertical-align: top;">
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</td>
<td style="border: 1px solid rgb(187, 187, 187);
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42, 42); vertical-align: top;">
<p style="color: rgb(42, 42, 42); margin-top: 0px;
margin-bottom: 0px; padding-bottom: 0px;
line-height: 18px;">Read-only</p>
</td>
</tr>
<tr>
<td style="border: 1px solid rgb(187, 187, 187);
margin: 10px; padding: 10px 8px; color: rgb(42,
42, 42); vertical-align: top;">
<p style="color: rgb(42, 42, 42); margin-top: 0px;
margin-bottom: 0px; padding-bottom: 0px;
line-height: 18px;">06</p>
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<td style="border: 1px solid rgb(187, 187, 187);
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42, 42); vertical-align: top;">
<p style="color: rgb(42, 42, 42); margin-top: 0px;
margin-bottom: 0px; padding-bottom: 0px;
line-height: 18px;">Read and write</p>
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</tr>
</tbody>
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<br>
<a moz-do-not-send="true"
href="http://msdn.microsoft.com/en-us/library/1w06ktdy.aspx">http://msdn.microsoft.com/en-us/library/1w06ktdy.aspx</a><br>
The definition are consistent with unistd.h. <br>
<br>
Test: JPRT and jtreg.<br>
<br>
Thanks<br>
Yumin<br>
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