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perf tools: Add more documentation to export-to-postgresql.py script
Add some comments to the script and some 'views' to the created database that better illustrate the database structure and how it can be used. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Link: http://lkml.kernel.org/r/1443186956-18718-8-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter
Arnaldo Carvalho de Melo
parent
a38f48e300
commit
35ca01c117
@ -61,6 +61,142 @@ import datetime
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#
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# An example of using the database is provided by the script
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# call-graph-from-postgresql.py. Refer to that script for details.
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#
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# Tables:
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#
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# The tables largely correspond to perf tools' data structures. They are largely self-explanatory.
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#
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# samples
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#
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# 'samples' is the main table. It represents what instruction was executing at a point in time
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# when something (a selected event) happened. The memory address is the instruction pointer or 'ip'.
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#
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# calls
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#
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# 'calls' represents function calls and is related to 'samples' by 'call_id' and 'return_id'.
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# 'calls' is only created when the 'calls' option to this script is specified.
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#
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# call_paths
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#
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# 'call_paths' represents all the call stacks. Each 'call' has an associated record in 'call_paths'.
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# 'calls_paths' is only created when the 'calls' option to this script is specified.
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#
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# branch_types
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#
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# 'branch_types' provides descriptions for each type of branch.
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#
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# comm_threads
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#
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# 'comm_threads' shows how 'comms' relates to 'threads'.
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#
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# comms
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#
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# 'comms' contains a record for each 'comm' - the name given to the executable that is running.
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#
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# dsos
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#
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# 'dsos' contains a record for each executable file or library.
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#
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# machines
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#
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# 'machines' can be used to distinguish virtual machines if virtualization is supported.
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#
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# selected_events
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#
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# 'selected_events' contains a record for each kind of event that has been sampled.
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#
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# symbols
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#
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# 'symbols' contains a record for each symbol. Only symbols that have samples are present.
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#
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# threads
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#
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# 'threads' contains a record for each thread.
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#
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# Views:
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#
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# Most of the tables have views for more friendly display. The views are:
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#
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# calls_view
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# call_paths_view
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# comm_threads_view
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# dsos_view
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# machines_view
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# samples_view
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# symbols_view
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# threads_view
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#
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# More examples of browsing the database with psql:
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# Note that some of the examples are not the most optimal SQL query.
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# Note that call information is only available if the script's 'calls' option has been used.
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#
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# Top 10 function calls (not aggregated by symbol):
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#
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# SELECT * FROM calls_view ORDER BY elapsed_time DESC LIMIT 10;
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#
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# Top 10 function calls (aggregated by symbol):
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#
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# SELECT symbol_id,(SELECT name FROM symbols WHERE id = symbol_id) AS symbol,
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# SUM(elapsed_time) AS tot_elapsed_time,SUM(branch_count) AS tot_branch_count
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# FROM calls_view GROUP BY symbol_id ORDER BY tot_elapsed_time DESC LIMIT 10;
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#
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# Note that the branch count gives a rough estimation of cpu usage, so functions
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# that took a long time but have a relatively low branch count must have spent time
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# waiting.
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#
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# Find symbols by pattern matching on part of the name (e.g. names containing 'alloc'):
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#
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# SELECT * FROM symbols_view WHERE name LIKE '%alloc%';
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#
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# Top 10 function calls for a specific symbol (e.g. whose symbol_id is 187):
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#
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# SELECT * FROM calls_view WHERE symbol_id = 187 ORDER BY elapsed_time DESC LIMIT 10;
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#
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# Show function calls made by function in the same context (i.e. same call path) (e.g. one with call_path_id 254):
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#
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# SELECT * FROM calls_view WHERE parent_call_path_id = 254;
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#
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# Show branches made during a function call (e.g. where call_id is 29357 and return_id is 29370 and tid is 29670)
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#
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# SELECT * FROM samples_view WHERE id >= 29357 AND id <= 29370 AND tid = 29670 AND event LIKE 'branches%';
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#
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# Show transactions:
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#
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# SELECT * FROM samples_view WHERE event = 'transactions';
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#
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# Note transaction start has 'in_tx' true whereas, transaction end has 'in_tx' false.
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# Transaction aborts have branch_type_name 'transaction abort'
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#
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# Show transaction aborts:
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#
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# SELECT * FROM samples_view WHERE event = 'transactions' AND branch_type_name = 'transaction abort';
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#
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# To print a call stack requires walking the call_paths table. For example this python script:
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# #!/usr/bin/python2
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#
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# import sys
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# from PySide.QtSql import *
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#
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# if __name__ == '__main__':
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# if (len(sys.argv) < 3):
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# print >> sys.stderr, "Usage is: printcallstack.py <database name> <call_path_id>"
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# raise Exception("Too few arguments")
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# dbname = sys.argv[1]
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# call_path_id = sys.argv[2]
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# db = QSqlDatabase.addDatabase('QPSQL')
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# db.setDatabaseName(dbname)
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# if not db.open():
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# raise Exception("Failed to open database " + dbname + " error: " + db.lastError().text())
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# query = QSqlQuery(db)
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# print " id ip symbol_id symbol dso_id dso_short_name"
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# while call_path_id != 0 and call_path_id != 1:
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# ret = query.exec_('SELECT * FROM call_paths_view WHERE id = ' + str(call_path_id))
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# if not ret:
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# raise Exception("Query failed: " + query.lastError().text())
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# if not query.next():
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# raise Exception("Query failed")
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# print "{0:>6} {1:>10} {2:>9} {3:<30} {4:>6} {5:<30}".format(query.value(0), query.value(1), query.value(2), query.value(3), query.value(4), query.value(5))
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# call_path_id = query.value(6)
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from PySide.QtSql import *
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@ -244,6 +380,91 @@ if perf_db_export_calls:
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'parent_call_path_id bigint,'
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'flags integer)')
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do_query(query, 'CREATE VIEW machines_view AS '
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'SELECT '
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'id,'
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'pid,'
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'root_dir,'
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'CASE WHEN id=0 THEN \'unknown\' WHEN pid=-1 THEN \'host\' ELSE \'guest\' END AS host_or_guest'
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' FROM machines')
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do_query(query, 'CREATE VIEW dsos_view AS '
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'SELECT '
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'id,'
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'machine_id,'
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'(SELECT host_or_guest FROM machines_view WHERE id = machine_id) AS host_or_guest,'
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'short_name,'
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'long_name,'
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'build_id'
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' FROM dsos')
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do_query(query, 'CREATE VIEW symbols_view AS '
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'SELECT '
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'id,'
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'name,'
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'(SELECT short_name FROM dsos WHERE id=dso_id) AS dso,'
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'dso_id,'
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'sym_start,'
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'sym_end,'
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'CASE WHEN binding=0 THEN \'local\' WHEN binding=1 THEN \'global\' ELSE \'weak\' END AS binding'
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' FROM symbols')
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do_query(query, 'CREATE VIEW threads_view AS '
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'SELECT '
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'id,'
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'machine_id,'
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'(SELECT host_or_guest FROM machines_view WHERE id = machine_id) AS host_or_guest,'
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'process_id,'
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'pid,'
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'tid'
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' FROM threads')
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do_query(query, 'CREATE VIEW comm_threads_view AS '
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'SELECT '
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'comm_id,'
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'(SELECT comm FROM comms WHERE id = comm_id) AS command,'
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'thread_id,'
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'(SELECT pid FROM threads WHERE id = thread_id) AS pid,'
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'(SELECT tid FROM threads WHERE id = thread_id) AS tid'
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' FROM comm_threads')
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if perf_db_export_calls:
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do_query(query, 'CREATE VIEW call_paths_view AS '
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'SELECT '
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'c.id,'
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'to_hex(c.ip) AS ip,'
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'c.symbol_id,'
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'(SELECT name FROM symbols WHERE id = c.symbol_id) AS symbol,'
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'(SELECT dso_id FROM symbols WHERE id = c.symbol_id) AS dso_id,'
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'(SELECT dso FROM symbols_view WHERE id = c.symbol_id) AS dso_short_name,'
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'c.parent_id,'
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'to_hex(p.ip) AS parent_ip,'
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'p.symbol_id AS parent_symbol_id,'
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'(SELECT name FROM symbols WHERE id = p.symbol_id) AS parent_symbol,'
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'(SELECT dso_id FROM symbols WHERE id = p.symbol_id) AS parent_dso_id,'
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'(SELECT dso FROM symbols_view WHERE id = p.symbol_id) AS parent_dso_short_name'
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' FROM call_paths c INNER JOIN call_paths p ON p.id = c.parent_id')
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do_query(query, 'CREATE VIEW calls_view AS '
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'SELECT '
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'calls.id,'
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'thread_id,'
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'(SELECT pid FROM threads WHERE id = thread_id) AS pid,'
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'(SELECT tid FROM threads WHERE id = thread_id) AS tid,'
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'(SELECT comm FROM comms WHERE id = comm_id) AS command,'
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'call_path_id,'
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'to_hex(ip) AS ip,'
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'symbol_id,'
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'(SELECT name FROM symbols WHERE id = symbol_id) AS symbol,'
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'call_time,'
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'return_time,'
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'return_time - call_time AS elapsed_time,'
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'branch_count,'
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'call_id,'
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'return_id,'
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'CASE WHEN flags=1 THEN \'no call\' WHEN flags=2 THEN \'no return\' WHEN flags=3 THEN \'no call/return\' ELSE \'\' END AS flags,'
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'parent_call_path_id'
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' FROM calls INNER JOIN call_paths ON call_paths.id = call_path_id')
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do_query(query, 'CREATE VIEW samples_view AS '
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'SELECT '
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'id,'
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