Messages in this thread | | | Date | Mon, 24 Aug 2015 10:00:17 +0300 | From | Adrian Hunter <> | Subject | Re: [PATCH V8 10/25] perf tools: Add example call-graph script |
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On 21/08/15 18:28, Arnaldo Carvalho de Melo wrote: > Em Fri, Aug 21, 2015 at 12:21:25PM -0300, Arnaldo Carvalho de Melo escreveu: >> Em Fri, Aug 21, 2015 at 12:11:33PM -0300, Arnaldo Carvalho de Melo escreveu: >>> [acme@zoo ~]$ perf script -s ~/libexec/perf-core/scripts/python/export-to-postgresql.py bts_example branches calls >>> 2015-08-21 12:10:00.504126 Creating database... >>> QSqlDatabase: QPSQL driver not loaded >>> QSqlDatabase: available drivers: QSQLITE >>> QSqlDatabase: an instance of QCoreApplication is required for loading driver plugins >>> QSqlQuery::exec: database not open >>> Traceback (most recent call last): >>> File "/home/acme/libexec/perf-core/scripts/python/export-to-postgresql.py", line 87, in <module> >>> do_query(query, 'CREATE DATABASE ' + dbname) >>> File "/home/acme/libexec/perf-core/scripts/python/export-to-postgresql.py", line 78, in do_query >>> raise Exception("Query failed: " + q.lastError().text()) >>> Exception: Query failed: Driver not loaded Driver not loaded >>> Error running python script /home/acme/libexec/perf-core/scripts/python/export-to-postgresql.py >>> [acme@zoo ~]$ >> >> A-ha, this was missing: >> >> [root@zoo ~]# rpm -ql qt-postgresql >> /usr/lib64/qt4/plugins/sqldrivers/libqsqlpsql.so >> [root@zoo ~]# >> >> [acme@zoo ~]$ perf script -s ~/libexec/perf-core/scripts/python/export-to-postgresql.py bts_example branches calls >> 2015-08-21 12:20:01.841677 Creating database... >> 2015-08-21 12:20:02.556853 Writing to intermediate files... >> 2015-08-21 12:20:03.262814 Copying to database... >> 2015-08-21 12:20:03.783109 Removing intermediate files... >> 2015-08-21 12:20:03.790282 Adding primary keys >> 2015-08-21 12:20:04.294342 Adding foreign keys >> 2015-08-21 12:20:04.718238 Done >> [acme@zoo ~]$ >> >> Now to the next steps... Lets see how this looks like with BTS... > > So, after running: > > [acme@zoo linux]$ python > tools/perf/scripts/python/call-graph-from-postgresql.py bts_example > > I got a GUI and after expanding some callchains I took this screenshot: > > http://vger.kernel.org/~acme/perf/call_graph_example_intel_bts.png > > Cool stuff! But it seems the COMM got messed up? I.e. that "1380:1380" > first level after "ls".
That is, in fact, correct. The top-level is the process (comm). The next level is the threads (pid/tid) for that process. Currently, each thread is reported separately.
For the future, there ought to be an option to combine the data for all threads of a process, or all processes with the same comm. Also presently it is not tracking if a thread sets it's own comm (e.g. some multi-threaded applications name each thread).
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