WL#7894: Improve dtrace support on Oracle Linux 6
Affects: Server-5.7 — Status: Complete — Priority: Medium
Background dtrace was initially developed by Sun for Solaris 10, however original work has been ported to both FreeBSD and Mac OS X 10.5. MySQL has included support for userland dtrace tracing since MySQL 5.5. Current status dtrace support is enabled and built if the build system (cmake) detects the "dtrace" command on the system. Currently, shipped server builds on Solaris and Mac OS X have dtrace support included. We now start supporting dtrace in the Server 5.6 and newer packages we ship for Oracle Linux 6 and newer. Our cmake setup does not correctly detect dtrace on Linux even on machines that have the dtrace enabled kernel and tools. A patch exists for this. Scope The scope of dtrace support for this WL is limited to Oracle Linux 6 and newer with UEK kernel. No significant adverse effects (primarily compatibility, performance) must be observable on related platforms that do not support dtrace but use the same MySQL Server binaries (See the Status and Requirements sections) At least support for the original dtrace on Oracle Linux 6 and newer is required. More testing of the dtrace features in MySQL is also needed. When packages with original dtrace support on Linux are available, testing must be performed to check for any compatibility or performance issues. Details Improvements to cmake/dtrace.cmake is needed to improve detection of available dtrace technology and enable on the "OL 6 with UEK kernel platform". Testing Add tests to MTR checking availability and at least minimal functioning of dtrace features. Note: testing might need privileged user account. Check for any performance regressions, with special care of Linux on platforms with and without original dtrace support. Add SysQA tests to check release packages for included dtrace support. References : Enabled by default since FreeBSD 9.2. https://wiki.freebsd.org/DTrace : https://en.wikipedia.org/wiki/DTrace#Supported_platforms : https://dev.mysql.com/doc/refman/5.5/en/dba-dtrace-server.html User Documentation ================== http://dev.mysql.com/doc/relnotes/mysql/5.6/en/news-5-6-20.html http://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-5.html (these announce the new support) http://dev.mysql.com/doc/refman/5.6/en/dba-dtrace-server.html http://dev.mysql.com/doc/refman/5.7/en/dba-dtrace-server.html (these just add OL6/UEK to the list of supported platforms)
Requirements Enable server builds with dtrace on Oracle Linux 6 using default cmake values and/or cmake build options.
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