[tip:perf/core] perf bench futex: Sanitize numeric parameters

[tip-bot for Davidlohr Bueso]

Commit-ID:  60758d6668b3e2fa8e5fd143d24d0425203d007e
Gitweb:     http://git.kernel.org/tip/60758d6668b3e2fa8e5fd143d24d0425203d007e
Author:     Davidlohr Bueso <dave@xxxxxxxxxxxx>
AuthorDate: Mon, 24 Oct 2016 13:56:53 -0700
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 25 Oct 2016 09:50:53 -0300

perf bench futex: Sanitize numeric parameters

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 <dbueso@xxxxxxx>
Tested-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1477342613-9938-3-git-send-email-dave@xxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/bench/futex-hash.c          | 4 ++++
 tools/perf/bench/futex-lock-pi.c       | 3 +++
 tools/perf/bench/futex-requeue.c       | 2 ++
 tools/perf/bench/futex-wake-parallel.c | 4 ++++
 tools/perf/bench/futex-wake.c          | 3 +++
 tools/perf/bench/futex.h               | 4 ++++
 6 files changed, 20 insertions(+)

diff --git a/tools/perf/bench/futex-hash.c b/tools/perf/bench/futex-hash.c
index da04b8c..bfbb6b5 100644
--- a/tools/perf/bench/futex-hash.c
+++ b/tools/perf/bench/futex-hash.c
@@ -130,6 +130,8 @@ int bench_futex_hash(int argc, const char **argv,
 	}
 
 	ncpus = sysconf(_SC_NPROCESSORS_ONLN);
+	nsecs = futexbench_sanitize_numeric(nsecs);
+	nfutexes = futexbench_sanitize_numeric(nfutexes);
 
 	sigfillset(&act.sa_mask);
 	act.sa_sigaction = toggle_done;
@@ -137,6 +139,8 @@ int bench_futex_hash(int argc, const char **argv,
 
 	if (!nthreads) /* default to the number of CPUs */
 		nthreads = ncpus;
+	else
+		nthreads = futexbench_sanitize_numeric(nthreads);
 
 	worker = calloc(nthreads, sizeof(*worker));
 	if (!worker)
diff --git a/tools/perf/bench/futex-lock-pi.c b/tools/perf/bench/futex-lock-pi.c
index 7032e46..465012b 100644
--- a/tools/perf/bench/futex-lock-pi.c
+++ b/tools/perf/bench/futex-lock-pi.c
@@ -152,6 +152,7 @@ int bench_futex_lock_pi(int argc, const char **argv,
 		goto err;
 
 	ncpus = sysconf(_SC_NPROCESSORS_ONLN);
+	nsecs = futexbench_sanitize_numeric(nsecs);
 
 	sigfillset(&act.sa_mask);
 	act.sa_sigaction = toggle_done;
@@ -159,6 +160,8 @@ int bench_futex_lock_pi(int argc, const char **argv,
 
 	if (!nthreads)
 		nthreads = ncpus;
+	else
+		nthreads = futexbench_sanitize_numeric(nthreads);
 
 	worker = calloc(nthreads, sizeof(*worker));
 	if (!worker)
diff --git a/tools/perf/bench/futex-requeue.c b/tools/perf/bench/futex-requeue.c
index 2b9705a..fd4ee95 100644
--- a/tools/perf/bench/futex-requeue.c
+++ b/tools/perf/bench/futex-requeue.c
@@ -128,6 +128,8 @@ int bench_futex_requeue(int argc, const char **argv,
 
 	if (!nthreads)
 		nthreads = ncpus;
+	else
+		nthreads = futexbench_sanitize_numeric(nthreads);
 
 	worker = calloc(nthreads, sizeof(*worker));
 	if (!worker)
diff --git a/tools/perf/bench/futex-wake-parallel.c b/tools/perf/bench/futex-wake-parallel.c
index 2c8fa67..beaa6c1 100644
--- a/tools/perf/bench/futex-wake-parallel.c
+++ b/tools/perf/bench/futex-wake-parallel.c
@@ -217,8 +217,12 @@ int bench_futex_wake_parallel(int argc, const char **argv,
 	sigaction(SIGINT, &act, NULL);
 
 	ncpus = sysconf(_SC_NPROCESSORS_ONLN);
+	nwaking_threads = futexbench_sanitize_numeric(nwaking_threads);
+
 	if (!nblocked_threads)
 		nblocked_threads = ncpus;
+	else
+		nblocked_threads = futexbench_sanitize_numeric(nblocked_threads);
 
 	/* some sanity checks */
 	if (nwaking_threads > nblocked_threads || !nwaking_threads)
diff --git a/tools/perf/bench/futex-wake.c b/tools/perf/bench/futex-wake.c
index e246b1b..46efcb9 100644
--- a/tools/perf/bench/futex-wake.c
+++ b/tools/perf/bench/futex-wake.c
@@ -129,6 +129,7 @@ int bench_futex_wake(int argc, const char **argv,
 	}
 
 	ncpus = sysconf(_SC_NPROCESSORS_ONLN);
+	nwakes = futexbench_sanitize_numeric(nwakes);
 
 	sigfillset(&act.sa_mask);
 	act.sa_sigaction = toggle_done;
@@ -136,6 +137,8 @@ int bench_futex_wake(int argc, const char **argv,
 
 	if (!nthreads)
 		nthreads = ncpus;
+	else
+		nthreads = futexbench_sanitize_numeric(nthreads);
 
 	worker = calloc(nthreads, sizeof(*worker));
 	if (!worker)
diff --git a/tools/perf/bench/futex.h b/tools/perf/bench/futex.h
index b2e06d1..ba7c735 100644
--- a/tools/perf/bench/futex.h
+++ b/tools/perf/bench/futex.h
@@ -7,6 +7,7 @@
 #ifndef _FUTEX_H
 #define _FUTEX_H
 
+#include <stdlib.h>
 #include <unistd.h>
 #include <sys/syscall.h>
 #include <sys/types.h>
@@ -99,4 +100,7 @@ static inline int pthread_attr_setaffinity_np(pthread_attr_t *attr,
 }
 #endif
 
+/* User input sanitation */
+#define futexbench_sanitize_numeric(__n) abs((__n))
+
 #endif /* _FUTEX_H */