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POTracing mysqld Using SystemTap
 

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    <p>I wanna use systemtap to trace MySQL.<br/> The problem is, after MySQL is configured and built and I start the server, I can't get the markers info that are present in the server:<br/></p> <p><code>[root@localhost]$ stap -l 'process("/home/mysql/mysql5.5.33/bin/mysqld").mark("*")'</code> <br/> <code>[root@localhost]$</code> <strong>(nothing ouput)</strong><br/></p> <p>My env as follows:<br/></p> <pre><code>1 stap version $ stap --version Systemtap translator/driver (version 1.7/0.152 non-git sources) Copyright (C) 2005-2012 Red Hat, Inc. and others This is free software; see the source for copying conditions. enabled features: AVAHI LIBRPM LIBSQLITE3 NSS BOOST_SHARED_PTR TR1_UNORDERED_MAP NLS </code></pre> <p>2 I configure MySQL using script as follows:<br/></p> <pre><code>cmake \ -DCMAKE_INSTALL_PREFIX=/home/mysql/mysql5.6.12 \ -DDEFAULT_CHARSET=utf8 \ -DDEFAULT_COLLATION=utf8_general_ci \ -DWITH_MYISAM_STORAGE_ENGINE=1 \ -DWITH_INNOBASE_STORAGE_ENGINE=1 \ -DENABLED_LOCAL_INFILE=1 \ -DENABLED_DTRACE=1 \ -DWITH_DEBUG=1 \ </code></pre> <p>BTW:I can get function output<br> <code>[root@localhost] stap -L 'process("/home/mysql/mysql5.6.12/bin/mysqld").function("main")'</code><br> <code>process("/home/mysql/mysql5.6.12/bin/mysqld").function("main@/home/mysql/mysql-5.6.12/sql/main.cc:23") $argc:int $argv:char**</code></p> <p>readelf -n /home/mysql/mysql5.6.12/bin/mysqld<br/> `Notes at offset 0x0000021c with length 0x00000020:<br/> Owner Data size Description<br/> GNU 0x00000010 NT_GNU_ABI_TAG (ABI version tag)<br/></p> <p>Notes at offset 0x0000023c with length 0x00000024:<br/> Owner Data size Description<br/> GNU 0x00000014 NT_GNU_BUILD_ID (unique build ID bitstring)`</p>
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    1. CODoes "readelf -n /home/mysql/mysql5.6.12/bin/mysqld" include some NT_STAPSDT bits?
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    2. COreadelf -n /home/mysql/mysql5.6.12/bin/mysqld Notes at offset 0x0000021c with length 0x00000020: Owner Data size Description GNU 0x00000010 NT_GNU_ABI_TAG (ABI version tag) Notes at offset 0x0000023c with length 0x00000024: Owner Data size Description GNU 0x00000014 NT_GNU_BUILD_ID (unique build ID bitstring)`
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