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
..
accounting
arch
bpf
build
cgroup
firewire
gpio
hv
iio
include
kvm/kvm_stat
laptop
leds
lib
memory-model
nfsd
objtool	x86/decoder: Add TEST opcode to Group3-2	2020-02-24 08:34:50 +01:00
pci
pcmcia
perf	perf bench futex-wake: Restore thread count default to online CPU count	2020-03-18 07:14:24 +01:00
power
scripts
spi
testing	ktest: Add timeout for ssh sync testing	2020-03-18 07:14:20 +01:00
thermal/tmon
time
usb
virtio
vm
wmi
Makefile