linux.git/tools/perf/bench, branch master

perf bench futex: Fix lock-pi help string

2016-12-20T12:37:40+00:00

Obvious copy/paste typo from the requeue program. Signed-off-by: Davidlohr Bueso Cc: Davidlohr Bueso Link: http://lkml.kernel.org/r/1481830584-30909-1-git-send-email-dave@stgolabs.net Signed-off-by: Arnaldo Carvalho de Melo

perf bench futex: Sanitize numeric parameters

2016-10-25T12:50:53+00:00

This gets rid of oddities such as: perf bench futex hash -t -4 perf: calloc: Cannot allocate memory Runtime (and many more) are equally busted, i.e. run for bogus amounts of time. Just use the abs, instead of, for example errorring out. Committer note: After the patch: $ perf bench futex hash -t -4 # Running 'futex/hash' benchmark: Run summary [PID 10178]: 4 threads, each operating on 1024 [private] futexes for 10 secs. [thread 0] futexes: 0x34f9fa0 ... 0x34faf9c [ 4702208 ops/sec ] [thread 1] futexes: 0x34fb140 ... 0x34fc13c [ 4707020 ops/sec ] [thread 2] futexes: 0x34fc2e0 ... 0x34fd2dc [ 4711526 ops/sec ] [thread 3] futexes: 0x34fd480 ... 0x34fe47c [ 4709683 ops/sec ] Averaged 4707609 operations/sec (+- 0.04%), total secs = 10 $ Signed-off-by: Davidlohr Bueso Tested-by: Arnaldo Carvalho de Melo Link: http://lkml.kernel.org/r/1477342613-9938-3-git-send-email-dave@stgolabs.net Signed-off-by: Arnaldo Carvalho de Melo

perf bench futex: Avoid worker cacheline bouncing

2016-10-25T12:50:47+00:00

Sebastian noted that overhead for worker thread ops (throughput) accounting was producing 'perf' to appear in the profiles, consuming a non-trivial (i.e. 13%) amount of CPU. This is due to cacheline bouncing due to the increment of w->ops. We can easily fix this by just working on a local copy and updating the actual worker once done running, and ready to show the program summary. There is no danger of the worker being concurrent, so we can trust that no stale value is being seen by another thread. This also gets rid of the unnecessary cache alignment hack; its not worth it. Reported-by: Sebastian Andrzej Siewior Signed-off-by: Davidlohr Bueso Acked-by: Sebastian Andrzej Siewior Link: http://lkml.kernel.org/r/1477342613-9938-2-git-send-email-dave@stgolabs.net Signed-off-by: Arnaldo Carvalho de Melo

perf bench futex: Cache align the worker struct

2016-10-24T14:07:45+00:00

It popped up in perf testing that the worker consumes some amount of CPU. It boils down to the increment of `ops` which causes cache line bouncing between the individual threads. This patch aligns the struct by 256 bytes to ensure that not a cache line is shared among CPUs. 128 byte is the x86 worst case and grep says that L1_CACHE_SHIFT is set to 8 on s390. Signed-off-by: Sebastian Andrzej Siewior Cc: Davidlohr Bueso Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20161016190803.3392-1-bigeasy@linutronix.de Signed-off-by: Arnaldo Carvalho de Melo

perf bench mem: Move boilerplate memory allocation to the infrastructure

2016-10-24T14:07:43+00:00

Instead of having all tests perform alloc/free, do it in the code that calls the do_cycles() and do_gettimeofday() functions. Cc: Adrian Hunter Cc: David Ahern Cc: Hitoshi Mitake Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-lywj4mbdb1m9x1z9asivwuuy@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf bench futex: Use NSEC_PER_USEC

2016-08-23T18:37:33+00:00

Following kernel practices and better documentin Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Steven Rostedt Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-xncwqxegjp13g2nxih3lp9mx@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf bench sched-messaging: Use USEC_PER_MSEC

2016-08-23T18:37:33+00:00

Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Steven Rostedt Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-xhyoyxejvorrgmwjx9k3j8k2@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf bench mem: Use USEC_PER_SEC

2016-08-23T18:37:33+00:00

Following kernel practices, using linux/time64.h Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Steven Rostedt Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-xdtmguafva17wp023sxojiib@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf bench sched-pipe: Use linux/time64.h, USEC_PER_SEC

2016-08-23T18:37:33+00:00

Following kernel practices. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Steven Rostedt Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-wgfu1h1pnw8lc919o2tan58y@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

perf bench numa: Use NSEC_PER_U?SEC

2016-08-23T18:37:33+00:00

Following kernel practices, using linux/time64.h Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Steven Rostedt Cc: Wang Nan Link: http://lkml.kernel.org/n/tip-7vnv15263y50qku76p4w5xk6@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo