I_S.profiling has NULL for getrusage statistics

[Raghavendra D Prabhu]

While working on an issue, it took me sometime to figure out why I_S.profiling has NULL for getrusage statistics.

Finally, checking the code, I was able to find out.

bool PROFILING::enabled_getrusage()
{
  return ((thd->variables.log_slow_verbosity & (ULL(1) << SLOG_V_PROFILING_USE_GETRUSAGE)) != 0);
}

 (I didn't look/search for log_slow_verbosity earlier because profiling is not related to slow logging (point#2 below))

Now:

1. Introduce a different variable for profiling -- I see boolean variables -- profiling_server and profiling_use_getrusage (http://www.percona.com/doc/percona-server/5.1/diagnostics/slow_extended.html?id=percona-server:features:slow_extended_51&redirect=2#log_slow_verbosity) but they don't exist / work.

2. Add separate documentation for profiling and getrusage. Currently it is mentioned under slow query logging which is independent from query profiling.

[Alexey Kopytov (akopytov)]

It's another regression introduced in 5.5 -- profiling_use_getrusage should work as advertised in 5.1. The regression was introduced by http://bazaar.launchpad.net/~percona-core/percona-server/5.5/revision/33.1.5

[Shahriyar Rzayev (rzayev-sehriyar)]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PS-1246