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Merge lp:~percona-toolkit-dev/percona-toolkit/pt-pmp-gdb-risks-docs.

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Daniel Nichter
2012-01-31 08:50:20 -07:00
parent 0a81ddeaad 56c3545af1
commit f78866c2f6
1 changed files with 9 additions and 1 deletions
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@@ -201,7 +201,15 @@ whether known or unknown, of using this tool. The two main categories of risks
are those created by the nature of the tool (e.g. read-only tools vs. read-write
tools) and those created by bugs.
pt-pmp is a read-only tool. It should be very low-risk.
pt-pmp is a read-only tool. However, collecting GDB stacktraces is achieved by
attaching GDB to the program and printing stack traces from all threads. This
will freeze the program for some period of time, ranging from a second or so to
much longer on very busy systems with a lot of memory and many threads in the
program. In the tool's default usage as a MySQL profiling tool, this means that
MySQL will be unresponsive while the tool runs, although if you are using the
tool to diagnose an unresponsive server, there is really no reason not to do
this. In addition to freezing the server, there is also some risk of the server
crashing or performing badly after GDB detaches from it.
At the time of this release, we know of no bugs that could cause serious harm
to users.