Well perf should work itself OK using the fallback timer-based method,
it's specifically this -e mode.
The hardware counters are in there and do stuff, the problem is (IIRC
overflow) interrupts are prone to get lost, distorting the numbers to
uselessness, and that problem is in the ARM core and lay undiscovered
for a long while so is in all (AFAIK) shipping chips. So we disabled
them, as I say normal perf should be workable.
I think we have to, as you suggest, do a WONTFIX on it.
** Changed in: linaro-landing-team-ti
Status: New => Incomplete
** Changed in: linaro-landing-team-ti
Status: Incomplete => Won't Fix
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https://bugs.launchpad.net/bugs/1018092
Title:
Perf test fails on Pandaboard (3.4 TILT)
Status in Linaro Texas Instruments Landing Team:
Won't Fix
Status in Linaro Ubuntu Evaluation Builds:
Confirmed
Status in “linux-ti-omap4” package in Ubuntu:
Confirmed
Bug description:
Test case available at lava-tests, and which can also be used from
https://code.launchpad.net/~linaro-maintainers/lava-test/lava-test-
perf.
./run-perf-test.sh
+ whoami
+ [ root != root ]
+ uname -r
+ cut -f 1 -d-
+ KERNELVER=3.4.0
+ apt-cache search linux-linaro-tools-3.4.0
+ head -1
+ cut -f 1 -d
+ PKGNAME=linux-linaro-tools-3.4.0-1-linaro-llt-origen
+ PERFBIN_PREFIX=/usr/bin/perf_
+ uname -r
+ awk -F - {print $1"-"$2}
+ PERFBIN_VER=3.4.0-1
+ [ ! -e /usr/bin/perf_3.4.0-1 ]
+ echo Performing perf record test...
Performing perf record test...
+ TCID=perf record test
+ perf record -e cycles -o perf-lava-test.data stress -c 4 -t 10
+ tee perf-record.log
stress: info: [5325] dispatching hogs: 4 cpu, 0 io, 0 vm, 0 hdd
stress: info: [5325] successful run completed in 10s
[ perf record: Woken up 3 times to write data ]
[ perf record: Captured and wrote 0.766 MB perf-lava-test.data (~33480
samples) ]
+ grep -ao [0-9]\+[ ]\+samples perf-record.log
+ cut -f 1 -d
+ samples=33480
+ [ 33480 -gt 1 ]
+ echo perf record test : PASS
perf record test : PASS
+ rm perf-record.log
+ echo Performing perf report test...
Performing perf report test...
+ TCID=perf report test
+ perf+ tee perf-report.log
report -i perf-lava-test.data
# ========
# captured on: Tue Jun 26 20:03:22 2012
# hostname : linaro-ubuntu-desktop
# os release : 3.4.0-1-linaro-lt-omap
# perf version : 3.4.0
# arch : armv7l
# nrcpus online : 2
# nrcpus avail : 2
# cpudesc : ARMv7 Processor rev 10 (v7l)
# total memory : 974156 kB
# cmdline : /usr/bin/perf_3.4.0-1 record -e cycles -o perf-lava-test.data
stress -c 4 -t 10
# event : name = cycles, type = 1, config = 0x0, config1 = 0x0, config2 =
0x0, excl_usr = 0, excl_kern = 0, id = { 15, 16 }
# HEADER_CPU_TOPOLOGY info available, use -I to display
# ========
#
# Events: 19K cpu-clock
#
# Overhead Command Shared Object Symbol
# ........ ....... ................. ...............................
#
38.10% stress libc-2.15.so [.] random_r
36.33% stress libc-2.15.so [.] random
20.79% stress stress [.] atoll_b
3.69% stress libc-2.15.so [.] rand
0.85% stress stress [.] main
0.16% stress [kernel.kallsyms] [k] _raw_spin_unlock_irqrestore
0.04% stress [kernel.kallsyms] [k] _raw_spin_unlock_irq
0.03% stress [kernel.kallsyms] [k] __do_softirq
0.01% stress [kernel.kallsyms] [k] vfp_support_entry
0.01% stress [kernel.kallsyms] [k] vfp_save_state
0.01% stress [kernel.kallsyms] [k] lock_acquire
0.01% stress [kernel.kallsyms] [k] rcu_process_gp_end.isra.23
0.01% stress [kernel.kallsyms] [k] kfree_skbmem
0.00% stress [kernel.kallsyms] [k] debug_check_no_locks_freed
0.00% stress [kernel.kallsyms] [k] filemap_fault
0.00% stress [kernel.kallsyms] [k] proc_flush_task_mnt
#
# (For a higher level overview, try: perf report --sort comm,dso)
#
+ grep -c -e ^[ ]\+[0-9]\+.[0-9]\+% perf-report.log
+ pcnt_samples=16
+ [ 16 -gt 1 ]
+ echo perf report test : PASS
perf report test : PASS
+ rm perf-report.log perf-lava-test.data
+ echo Performing perf stat test...
Performing perf stat test...
+ TCID=perf stat test
+ perf stat -e cycles stress -c 4 -t 10
+ tee perf-stat.log
Error: open_counter returned with 19 (No such device). /bin/dmesg may
provide additional information.
Fatal: Not all events could be opened.
+ grep -o [0-9,]\+[ ]\+cycles perf-stat.log
+ sed s/,//g
+ cut -f 1 -d
+ cycles=
+ [ -gt 1 ]
./run-perf-test.sh: 71: [: -gt: unexpected operator
+ echo perf stat test : FAIL
perf stat test : FAIL
+ rm perf-stat.log
+ echo Performing 'perf test'...
Performing 'perf test'...
+ TCID=perf test
+ perf test
+ sed -e s/FAILED!/FAIL/g -e s/Ok/PASS/g -e s/ [0-9]\+:/perf test -/g -e s/:/
:/g
perf test - vmlinux symtab matches kallsyms : FAIL
perf test - detect open syscall event : FAIL
perf test - detect open syscall event on all cpus : FAIL
perf test - read samples using the mmap interface : FAIL
perf test - parse events tests :invalid or unsupported event : 'syscalls
:sys_enter_open'
Run 'perf list' for a list of valid events
FAIL
perf test - Validate PERF_RECORD_* events & perf_sample fields : FAIL
perf test - Test perf pmu format parsing : PASS
Using:
Hwpack: hwpack_linaro-lt-panda-x11-base_20120626-139_armhf_supported.tar.gz
Rootfs: linaro-precise-ubuntu-desktop-20120626-247.tar.gz
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