Re: operf not resulting in any samples
William Cohen <[email protected]>
| Newsgroups | gmane.linux.oprofile |
|---|---|
| Message-ID | <[email protected]> |
On 04/20/2018 06:02 PM, First Strike wrote: > To add, I am building the kernel with following configs: > CONFIG_OPROFILE=y > CONFIG_HAVE_OPROFILE=y > CONFIG_TRACING=y > CONFIG_TRACING_SUPPORT=y > > > On Fri, Apr 20, 2018 at 2:48 PM, First Strike <[email protected] <mailto:[email protected]>> wrote: > > Folks, > > I am running Windriver linux (4.8.22-WR9) on ARM Cortex A9 CPU with > # operf -v > operf: oprofile 1.1.0 > > I ran 'operf --system-wide' as well as for a specific process for approx 5mins followed by opreport. It complains with error "No Sample found". > > Can someone let me know what I could be missing out? > Hi, operf uses the perf interface rather than the older oprofile kernel support. If the kernel provides hardware event counting, you should see something like the following for the kernel perf tool (the cycles:u, instructions:u, branches:u, and branch-misses:u): $ perf stat true Performance counter stats for 'true': 9.324083 task-clock:u (msec) # 0.339 CPUs utilized 0 context-switches:u # 0.000 K/sec 0 cpu-migrations:u # 0.000 K/sec 38 page-faults:u # 0.004 M/sec 454,860 cycles:u # 0.049 GHz 174,579 instructions:u # 0.38 insn per cycle 16,555 branches:u # 1.776 M/sec 5,739 branch-misses:u # 34.67% of all branches 0.027514525 seconds time elapsed I suspect that you will need to compile the kernel with the following configure settings to provide pmu counters to operf: CONFIG_PERF_EVENTS=y CONFIG_HW_PERF_EVENTS=y -Will > > > > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > > _______________________________________________ > oprofile-list mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/oprofile-list ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ oprofile-list mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/oprofile-list