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Tommi Rantala 5e8dff9964 perf bench futex-wake: Restore thread count default to online CPU count 
commit f649bd9dd5d5004543bbc3c50b829577b49f5d75 upstream.

Since commit 3b2323c2c1 ("perf bench futex: Use cpumaps") the default
number of threads the benchmark uses got changed from number of online
CPUs to zero:

  $ perf bench futex wake
  # Running 'futex/wake' benchmark:
  Run summary [PID 15930]: blocking on 0 threads (at [private] futex 0x558b8ee4bfac), waking up 1 at a time.
  [Run 1]: Wokeup 0 of 0 threads in 0.0000 ms
  [...]
  [Run 10]: Wokeup 0 of 0 threads in 0.0000 ms
  Wokeup 0 of 0 threads in 0.0004 ms (+-40.82%)

Restore the old behavior by grabbing the number of online CPUs via
cpu->nr:

  $ perf bench futex wake
  # Running 'futex/wake' benchmark:
  Run summary [PID 18356]: blocking on 8 threads (at [private] futex 0xb3e62c), waking up 1 at a time.
  [Run 1]: Wokeup 8 of 8 threads in 0.0260 ms
  [...]
  [Run 10]: Wokeup 8 of 8 threads in 0.0270 ms
  Wokeup 8 of 8 threads in 0.0419 ms (+-24.35%)

Fixes: 3b2323c2c1 ("perf bench futex: Use cpumaps")
Signed-off-by: Tommi Rantala <tommi.t.rantala@nokia.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Darren Hart <dvhart@infradead.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lore.kernel.org/lkml/20200305083714.9381-3-tommi.t.rantala@nokia.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-03-18 07:14:24 +01:00
..
arch
bench perf bench futex-wake: Restore thread count default to online CPU count 2020-03-18 07:14:24 +01:00
Documentation
examples/bpf
include/bpf
jvmti
pmu-events perf jevents: Fix resource leak in process_mapfile() and main() 2019-12-31 16:35:43 +01:00
python
scripts
tests perf tests: Disable bp_signal testing for arm64 2019-12-31 16:35:21 +01:00
trace
ui perf hists browser: Restore ESC as "Zoom out" of DSO/thread/etc 2020-03-05 16:42:22 +01:00
util perf stat: Fix shadow stats for clock events 2020-03-05 16:42:22 +01:00
.gitignore
Build
builtin-annotate.c
builtin-bench.c
builtin-buildid-cache.c
builtin-buildid-list.c
builtin-c2c.c perf c2c: Fix return type for histogram sorting comparision functions 2020-02-05 14:43:34 +00:00
builtin-config.c
builtin-data.c
builtin-diff.c
builtin-evlist.c
builtin-ftrace.c
builtin-help.c
builtin-inject.c
builtin-kallsyms.c
builtin-kmem.c
builtin-kvm.c
builtin-list.c
builtin-lock.c
builtin-mem.c
builtin-probe.c
builtin-record.c
builtin-report.c perf report: Fix no libunwind compiled warning break s390 issue 2020-02-05 14:43:54 +00:00
builtin-sched.c
builtin-script.c perf script: Fix brstackinsn for AUXTRACE 2020-01-04 19:13:13 +01:00
builtin-stat.c
builtin-timechart.c
builtin-top.c
builtin-trace.c
builtin-version.c
builtin.h
check-headers.sh
command-list.txt
CREDITS
design.txt
Makefile
Makefile.config
Makefile.perf
MANIFEST
perf-archive.sh
perf-completion.sh
perf-read-vdso.c
perf-sys.h
perf-with-kcore.sh
perf.c
perf.h