[PATCH 0/6] Miscellaneous cyclictest patches

[PATCH 0/6] Miscellaneous cyclictest patches

[John Kacur]

Miscellany of cyclictest patches, most are just clean-ups

Slightly more important are fixes to set_latency_target to always print
a message if writing 0 to /dev/cpu_dma_latency fails and also an option
to allow you to not use this functionality if you wish.

Pushed to 

repo: https://www.kernel.org/pub/scm/linux/kernel/git/jkacur/rt-tests.git/
branch: v0.89-devel

Cheers!

John Kacur (6):
  lib: Rework err_msg_n to output strerror after message
  rt_numa.h: Suppress discards 'const' qualifier warning
  cyclictest: Always print an err message if write of 0 to
    cpu-dma_latency fails
  cyclictest: Change the output from function sighand() to stderr
  cyclictest: Fix help for long options only
  cyclictest: Add long option --laptop to preserve battery power

 src/cyclictest/cyclictest.c | 69 ++++++++++++++++++++++++++++++---------------
 src/cyclictest/rt_numa.h    |  2 +-
 src/lib/error.c             |  4 +--
 3 files changed, 49 insertions(+), 26 deletions(-)

-- 
1.8.1.4

[PATCH 1/6] lib: Rework err_msg_n to output strerror after message

[John Kacur]

Outputting the message first followed by the strerror makes
the error messages more readable.

Signed-off-by: John Kacur <jkacur@redhat.com>
---
 src/cyclictest/cyclictest.c | 4 ++--
 src/lib/error.c             | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/cyclictest/cyclictest.c b/src/cyclictest/cyclictest.c
index 4547831fedc9..01dfc75fd70c 100644
--- a/src/cyclictest/cyclictest.c
+++ b/src/cyclictest/cyclictest.c
@@ -669,7 +669,7 @@ static int raise_soft_prio(int policy, const struct sched_param *param)
 	err = getrlimit(RLIMIT_RTPRIO, &rlim);
 	if (err) {
 		err = errno;
-		err_msg_n(err, "WARN: getrlimit failed\n");
+		err_msg_n(err, "WARN: getrlimit failed");
 		return err;
 	}
 
@@ -681,7 +681,7 @@ static int raise_soft_prio(int policy, const struct sched_param *param)
 		err = setrlimit(RLIMIT_RTPRIO, &rlim);
 		if (err) {
 			err = errno;
-			err_msg_n(err, "WARN: setrlimit failed\n");
+			err_msg_n(err, "WARN: setrlimit failed");
 			/* return err; */
 		}
 	} else {
diff --git a/src/lib/error.c b/src/lib/error.c
index 1b5de5dabeaf..5eb63527659c 100644
--- a/src/lib/error.c
+++ b/src/lib/error.c
@@ -79,8 +79,8 @@ void fatal(char *fmt, ...)
 
 void err_doit(int err, const char *fmt, va_list ap)
 {
-	if (err)
-		fprintf(stderr, "%s\n", strerror(err));
 	vfprintf(stderr, fmt, ap);
+	if (err)
+		fprintf(stderr, ": %s\n", strerror(err));
 	return;
 }
-- 
1.8.1.4

[PATCH 2/6] rt_numa.h: Suppress discards 'const' qualifier warning

[John Kacur]

In rt-tests we try to use const where appropriate for read-only, but
we need to tell the compiler we are intentionally discarding const
when calling library functions that expect char *

Signed-off-by: John Kacur <jkacur@redhat.com>
---
 src/cyclictest/rt_numa.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/cyclictest/rt_numa.h b/src/cyclictest/rt_numa.h
index e64c44635380..60a143721da1 100644
--- a/src/cyclictest/rt_numa.h
+++ b/src/cyclictest/rt_numa.h
@@ -101,7 +101,7 @@ static inline struct bitmask* rt_numa_parse_cpustring(const char* s,
 	 * libnuma do not have this function.  A work around should be to run
 	 * your command with e.g. taskset -c 9-15 <command>
 	 */
-	return numa_parse_cpustring(s);
+	return numa_parse_cpustring((char *)s);
 #endif
 }
 
-- 
1.8.1.4

[PATCH 3/6] cyclictest: Always print an err message if write of 0 to cpu-dma_latency fails

[John Kacur]

In set_latency_target() there are some paths that don't print an error
message even when a write of 0 to /dev/cpu_dma_latency fails.

This patch does the following
- always print an error message if the write to /dev/cpu_dma_latency
fails
- Fix the error check with the write call. (a return of 0 or -1 indicate
 problems
- rename ret to err since this function is void and returns no value
- use err_msg_n instead of printf (which also prints to stderr)

Signed-off-by: John Kacur <jkacur@redhat.com>
---
 src/cyclictest/cyclictest.c | 34 ++++++++++++++++++++++------------
 1 file changed, 22 insertions(+), 12 deletions(-)

diff --git a/src/cyclictest/cyclictest.c b/src/cyclictest/cyclictest.c
index 01dfc75fd70c..64f1764681b0 100644
--- a/src/cyclictest/cyclictest.c
+++ b/src/cyclictest/cyclictest.c
@@ -233,20 +233,30 @@ static int32_t latency_target_value = 0;
 static void set_latency_target(void)
 {
 	struct stat s;
-	int ret;
+	int err;
 
-	if (stat("/dev/cpu_dma_latency", &s) == 0) {
-		latency_target_fd = open("/dev/cpu_dma_latency", O_RDWR);
-		if (latency_target_fd == -1)
-			return;
-		ret = write(latency_target_fd, &latency_target_value, 4);
-		if (ret == 0) {
-			printf("# error setting cpu_dma_latency to %d!: %s\n", latency_target_value, strerror(errno));
-			close(latency_target_fd);
-			return;
-		}
-		printf("# /dev/cpu_dma_latency set to %dus\n", latency_target_value);
+	errno = 0;
+	err = stat("/dev/cpu_dma_latency", &s);
+	if (err == -1) {
+		err_msg_n(errno, "WARN: stat /dev/cpu_dma_latency failed");
+		return;
+	}
+
+	errno = 0;
+	latency_target_fd = open("/dev/cpu_dma_latency", O_RDWR);
+	if (latency_target_fd == -1) {
+		err_msg_n(errno, "WARN: open /dev/cpu_dma_latency");
+		return;
+	}
+
+	errno = 0;
+	err = write(latency_target_fd, &latency_target_value, 4);
+	if (err < 1) {
+		err_msg_n(errno, "# error setting cpu_dma_latency to %d!", latency_target_value);
+		close(latency_target_fd);
+		return;
 	}
+	printf("# /dev/cpu_dma_latency set to %dus\n", latency_target_value);
 }
 
 
-- 
1.8.1.4

[PATCH 4/6] cyclictest: Change the output from function sighand() to stderr

[John Kacur]

cyclictest can be run from other tools such as rteval
in order to get current status on long runs, SIGUSR1 is sent to
cyclictest and caught by function sighand()

This creates difficulties for rteval when parsing cyclictest output, so
change the output to stderr.

Note, a RFC was sent out on Apr.15 2014 entitled
"RFC: SIGUSR1 to stderr"
to:	 RT <linux-rt-users@vger.kernel.org>
cc:	 Carsten Emde <C.Emde@osadl.org>,
	 Thomas Gleixner <tglx@linutronix.de>,
	  Clark Williams <williams@redhat.com>

Since I didn't receive any replies, I'm assumin there are no objections

Signed-off-by: John Kacur <jkacur@redhat.com>
---
 src/cyclictest/cyclictest.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/cyclictest/cyclictest.c b/src/cyclictest/cyclictest.c
index 64f1764681b0..ad7890ffaa95 100644
--- a/src/cyclictest/cyclictest.c
+++ b/src/cyclictest/cyclictest.c
@@ -1569,11 +1569,11 @@ static void sighand(int sig)
 		int oldquiet = quiet;
 
 		quiet = 0;
-		printf("#---------------------------\n");
-		printf("# cyclictest current status:\n");
+		fprintf(stderr, "#---------------------------\n");
+		fprintf(stderr, "# cyclictest current status:\n");
 		for (i = 0; i < num_threads; i++)
-			print_stat(stdout, parameters[i], i, 0, 0);
-		printf("#---------------------------\n");
+			print_stat(stderr, parameters[i], i, 0, 0);
+		fprintf(stderr, "#---------------------------\n");
 		quiet = oldquiet;
 		return;
 	}
-- 
1.8.1.4

[PATCH 5/6] cyclictest: Fix help for long options only

[John Kacur]

At some point in the history of cyclictest, a number of short options
were removed and changed to long only options. However the display_help
was not updated to reflect this and indicates short options that
no longer exist. Fix this. I also found a long option that wasn't listed
at all and added that.

Signed-off-by: John Kacur <jkacur@redhat.com>
---
 src/cyclictest/cyclictest.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/cyclictest/cyclictest.c b/src/cyclictest/cyclictest.c
index ad7890ffaa95..b45041e01f3a 100644
--- a/src/cyclictest/cyclictest.c
+++ b/src/cyclictest/cyclictest.c
@@ -1009,7 +1009,7 @@ static void display_help(int error)
 	       "-D       --duration=t      specify a length for the test run\n"
 	       "                           default is in seconds, but 'm', 'h', or 'd' maybe added\n"
 	       "                           to modify value to minutes, hours or days\n"
-	       "-e       --latency=PM_QOS  write PM_QOS to /dev/cpu_dma_latency\n"
+	       "	 --latency=PM_QOS  write PM_QOS to /dev/cpu_dma_latency\n"
 	       "-E       --event           event tracing (used with -b)\n"
 	       "-f       --ftrace          function trace (when -b is active)\n"
 	       "-F       --fifo=<path>     create a named pipe at path and write stats to it\n"
@@ -1023,13 +1023,14 @@ static void display_help(int error)
 	       "-m       --mlockall        lock current and future memory allocations\n"
 	       "-M       --refresh_on_max  delay updating the screen until a new max latency is hit\n"
 	       "-n       --nanosleep       use clock_nanosleep\n"
+	       "	 --notrace	   suppress tracing\n"
 	       "-N       --nsecs           print results in ns instead of us (default us)\n"
 	       "-o RED   --oscope=RED      oscilloscope mode, reduce verbose output by RED\n"
 	       "-O TOPT  --traceopt=TOPT   trace option\n"
 	       "-p PRIO  --prio=PRIO       priority of highest prio thread\n"
 	       "-P       --preemptoff      Preempt off tracing (used with -b)\n"
 	       "-q       --quiet           print only a summary on exit\n"
-	       "-Q       --priospread       spread priority levels starting at specified value\n"
+	       "	 --priospread       spread priority levels starting at specified value\n"
 	       "-r       --relative        use relative timer instead of absolute\n"
 	       "-R       --resolution      check clock resolution, calling clock_gettime() many\n"
 	       "                           times.  list of clock_gettime() values will be\n"
@@ -1052,8 +1053,8 @@ static void display_help(int error)
 	       "                           format: n:c:v n=tasknum c=count v=value in us\n"
 	       "-w       --wakeup          task wakeup tracing (used with -b)\n"
 	       "-W       --wakeuprt        rt task wakeup tracing (used with -b)\n"
-	       "-X       --dbg_cyclictest  print info useful for debugging cyclictest\n"
-	       "-y POLI  --policy=POLI     policy of realtime thread, POLI may be fifo(default) or rr\n"
+	       "	 --dbg_cyclictest  print info useful for debugging cyclictest\n"
+	       "	 --policy=POLI     policy of realtime thread, POLI may be fifo(default) or rr\n"
 	       "                           format: --policy=fifo(default) or --policy=rr\n",
 	       tracers
 		);
-- 
1.8.1.4

Re: [PATCH 5/6] cyclictest: Fix help for long options only

[Michael]

Hi John,

I submitted an almost identical patch to this one a few weeks ago, but 
haven't heard anything:
http://www.spinics.net/lists/linux-rt-users/msg12140.html

I thought I might follow-up with some more patches to bring the 
comments/docs in sync with the code, but I didn't see anything happening 
with my first submission, so I haven't bothered.

What to do?  Can I resubmit mine to add the one change you made which I 
didn't (--notrace)?

Michael

On 08/14/2014 06:18 PM, John Kacur wrote:
> At some point in the history of cyclictest, a number of short options
> were removed and changed to long only options. However the display_help
> was not updated to reflect this and indicates short options that
> no longer exist. Fix this. I also found a long option that wasn't listed
> at all and added that.
>
> Signed-off-by: John Kacur <jkacur@redhat.com>
> ---
>   src/cyclictest/cyclictest.c | 9 +++++----
>   1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/src/cyclictest/cyclictest.c b/src/cyclictest/cyclictest.c
> index ad7890ffaa95..b45041e01f3a 100644
> --- a/src/cyclictest/cyclictest.c
> +++ b/src/cyclictest/cyclictest.c
> @@ -1009,7 +1009,7 @@ static void display_help(int error)
>   	       "-D       --duration=t      specify a length for the test run\n"
>   	       "                           default is in seconds, but 'm', 'h', or 'd' maybe added\n"
>   	       "                           to modify value to minutes, hours or days\n"
> -	       "-e       --latency=PM_QOS  write PM_QOS to /dev/cpu_dma_latency\n"
> +	       "	 --latency=PM_QOS  write PM_QOS to /dev/cpu_dma_latency\n"
>   	       "-E       --event           event tracing (used with -b)\n"
>   	       "-f       --ftrace          function trace (when -b is active)\n"
>   	       "-F       --fifo=<path>     create a named pipe at path and write stats to it\n"
> @@ -1023,13 +1023,14 @@ static void display_help(int error)
>   	       "-m       --mlockall        lock current and future memory allocations\n"
>   	       "-M       --refresh_on_max  delay updating the screen until a new max latency is hit\n"
>   	       "-n       --nanosleep       use clock_nanosleep\n"
> +	       "	 --notrace	   suppress tracing\n"
>   	       "-N       --nsecs           print results in ns instead of us (default us)\n"
>   	       "-o RED   --oscope=RED      oscilloscope mode, reduce verbose output by RED\n"
>   	       "-O TOPT  --traceopt=TOPT   trace option\n"
>   	       "-p PRIO  --prio=PRIO       priority of highest prio thread\n"
>   	       "-P       --preemptoff      Preempt off tracing (used with -b)\n"
>   	       "-q       --quiet           print only a summary on exit\n"
> -	       "-Q       --priospread       spread priority levels starting at specified value\n"
> +	       "	 --priospread       spread priority levels starting at specified value\n"
>   	       "-r       --relative        use relative timer instead of absolute\n"
>   	       "-R       --resolution      check clock resolution, calling clock_gettime() many\n"
>   	       "                           times.  list of clock_gettime() values will be\n"
> @@ -1052,8 +1053,8 @@ static void display_help(int error)
>   	       "                           format: n:c:v n=tasknum c=count v=value in us\n"
>   	       "-w       --wakeup          task wakeup tracing (used with -b)\n"
>   	       "-W       --wakeuprt        rt task wakeup tracing (used with -b)\n"
> -	       "-X       --dbg_cyclictest  print info useful for debugging cyclictest\n"
> -	       "-y POLI  --policy=POLI     policy of realtime thread, POLI may be fifo(default) or rr\n"
> +	       "	 --dbg_cyclictest  print info useful for debugging cyclictest\n"
> +	       "	 --policy=POLI     policy of realtime thread, POLI may be fifo(default) or rr\n"
>   	       "                           format: --policy=fifo(default) or --policy=rr\n",
>   	       tracers
>   		);
>

Re: [PATCH 5/6] cyclictest: Fix help for long options only

[John Kacur]

----- Original Message -----
> Hi John,
> 
> I submitted an almost identical patch to this one a few weeks ago, but
> haven't heard anything:
> http://www.spinics.net/lists/linux-rt-users/msg12140.html
> 
> I thought I might follow-up with some more patches to bring the
> comments/docs in sync with the code, but I didn't see anything happening
> with my first submission, so I haven't bothered.
> 
> What to do?  Can I resubmit mine to add the one change you made which I
> didn't (--notrace)?
> 

Sorry about that, we probably missed it because of a combination of being
busy with other things and vacations, but yes please, if you have another
patch on top of what's already there, then please submit it.

You can get my development branch here:
Repo: git://git.kernel.org/pub/scm/linux/kernel/git/jkacur/rt-tests.git
Branch: v0.89-devel

Thanks

[PATCH 6/6] cyclictest: Add long option --laptop to preserve battery power

[John Kacur]

Some people running cyclictest on laptops don't want to automatically
take advantage of the trick that prevents the power management to
transistion to high cstates, since it eats up their battery power.

Allow them to suppress this feature with --laptop

This will result in power latency results of course.

Feature-requested-by:  Joakim Hernberg <jhernberg@alchemy.lu>
Signed-off-by: John Kacur <jkacur@redhat.com>
---
 src/cyclictest/cyclictest.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/cyclictest/cyclictest.c b/src/cyclictest/cyclictest.c
index b45041e01f3a..a3e7b1d6c377 100644
--- a/src/cyclictest/cyclictest.c
+++ b/src/cyclictest/cyclictest.c
@@ -186,6 +186,7 @@ static int use_fifo = 0;
 static pthread_t fifo_threadid;
 static int aligned = 0;
 static int offset = 0;
+static int laptop = 0;
 
 static pthread_cond_t refresh_on_max_cond = PTHREAD_COND_INITIALIZER;
 static pthread_mutex_t refresh_on_max_lock = PTHREAD_MUTEX_INITIALIZER;
@@ -235,6 +236,11 @@ static void set_latency_target(void)
 	struct stat s;
 	int err;
 
+	if (laptop) {
+		warn("not setting cpu_dma_latency to save battery power\n");
+		return;
+	}
+
 	errno = 0;
 	err = stat("/dev/cpu_dma_latency", &s);
 	if (err == -1) {
@@ -1020,6 +1026,9 @@ static void display_help(int error)
 	       "-i INTV  --interval=INTV   base interval of thread in us default=1000\n"
 	       "-I       --irqsoff         Irqsoff tracing (used with -b)\n"
 	       "-l LOOPS --loops=LOOPS     number of loops: default=0(endless)\n"
+	       "	 --laptop	   Save battery when running cyclictest\n"
+	       "			   This will give you poorer realtime results\n"
+	       "			   but will not drain your battery so quickly\n"
 	       "-m       --mlockall        lock current and future memory allocations\n"
 	       "-M       --refresh_on_max  delay updating the screen until a new max latency is hit\n"
 	       "-n       --nanosleep       use clock_nanosleep\n"
@@ -1183,7 +1192,7 @@ enum option_values {
 	OPT_QUIET, OPT_PRIOSPREAD, OPT_RELATIVE, OPT_RESOLUTION, OPT_SYSTEM,
 	OPT_SMP, OPT_THREADS, OPT_TRACER, OPT_UNBUFFERED, OPT_NUMA, OPT_VERBOSE,
 	OPT_WAKEUP, OPT_WAKEUPRT, OPT_DBGCYCLIC, OPT_POLICY, OPT_HELP, OPT_NUMOPTS,
-	OPT_ALIGNED,
+	OPT_ALIGNED, OPT_LAPTOP,
 };
 
 /* Process commandline options */
@@ -1216,6 +1225,7 @@ static void process_options (int argc, char *argv[], int max_cpus)
 			{"histofall",        required_argument, NULL, OPT_HISTOFALL },
 			{"interval",         required_argument, NULL, OPT_INTERVAL },
 			{"irqsoff",          no_argument,       NULL, OPT_IRQSOFF },
+			{"laptop",	     no_argument,	NULL, OPT_LAPTOP },
 			{"loops",            required_argument, NULL, OPT_LOOPS },
 			{"mlockall",         no_argument,       NULL, OPT_MLOCKALL },
 			{"refresh_on_max",   no_argument,       NULL, OPT_REFRESH },
@@ -1445,6 +1455,8 @@ static void process_options (int argc, char *argv[], int max_cpus)
 			handlepolicy(optarg); break;
 		case OPT_DBGCYCLIC:
 			ct_debug = 1; break;
+		case OPT_LAPTOP:
+			laptop = 1; break;
 		}
 	}
 
-- 
1.8.1.4

Re: [PATCH 6/6] cyclictest: Add long option --laptop to preserve battery power

[John Kacur]

On Thu, 14 Aug 2014, John Kacur wrote:

> Some people running cyclictest on laptops don't want to automatically
> take advantage of the trick that prevents the power management to
> transistion to high cstates, since it eats up their battery power.
> 
> Allow them to suppress this feature with --laptop
> 
> This will result in power latency results of course.

The above should read: "This will result in poorer latency results of 
course."
> 
> Feature-requested-by:  Joakim Hernberg <jhernberg@alchemy.lu>
> Signed-off-by: John Kacur <jkacur@redhat.com>
> ---
>  src/cyclictest/cyclictest.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/src/cyclictest/cyclictest.c b/src/cyclictest/cyclictest.c
> index b45041e01f3a..a3e7b1d6c377 100644
> --- a/src/cyclictest/cyclictest.c
> +++ b/src/cyclictest/cyclictest.c
> @@ -186,6 +186,7 @@ static int use_fifo = 0;
>  static pthread_t fifo_threadid;
>  static int aligned = 0;
>  static int offset = 0;
> +static int laptop = 0;
>  
>  static pthread_cond_t refresh_on_max_cond = PTHREAD_COND_INITIALIZER;
>  static pthread_mutex_t refresh_on_max_lock = PTHREAD_MUTEX_INITIALIZER;
> @@ -235,6 +236,11 @@ static void set_latency_target(void)
>  	struct stat s;
>  	int err;
>  
> +	if (laptop) {
> +		warn("not setting cpu_dma_latency to save battery power\n");
> +		return;
> +	}
> +
>  	errno = 0;
>  	err = stat("/dev/cpu_dma_latency", &s);
>  	if (err == -1) {
> @@ -1020,6 +1026,9 @@ static void display_help(int error)
>  	       "-i INTV  --interval=INTV   base interval of thread in us default=1000\n"
>  	       "-I       --irqsoff         Irqsoff tracing (used with -b)\n"
>  	       "-l LOOPS --loops=LOOPS     number of loops: default=0(endless)\n"
> +	       "	 --laptop	   Save battery when running cyclictest\n"
> +	       "			   This will give you poorer realtime results\n"
> +	       "			   but will not drain your battery so quickly\n"
>  	       "-m       --mlockall        lock current and future memory allocations\n"
>  	       "-M       --refresh_on_max  delay updating the screen until a new max latency is hit\n"
>  	       "-n       --nanosleep       use clock_nanosleep\n"
> @@ -1183,7 +1192,7 @@ enum option_values {
>  	OPT_QUIET, OPT_PRIOSPREAD, OPT_RELATIVE, OPT_RESOLUTION, OPT_SYSTEM,
>  	OPT_SMP, OPT_THREADS, OPT_TRACER, OPT_UNBUFFERED, OPT_NUMA, OPT_VERBOSE,
>  	OPT_WAKEUP, OPT_WAKEUPRT, OPT_DBGCYCLIC, OPT_POLICY, OPT_HELP, OPT_NUMOPTS,
> -	OPT_ALIGNED,
> +	OPT_ALIGNED, OPT_LAPTOP,
>  };
>  
>  /* Process commandline options */
> @@ -1216,6 +1225,7 @@ static void process_options (int argc, char *argv[], int max_cpus)
>  			{"histofall",        required_argument, NULL, OPT_HISTOFALL },
>  			{"interval",         required_argument, NULL, OPT_INTERVAL },
>  			{"irqsoff",          no_argument,       NULL, OPT_IRQSOFF },
> +			{"laptop",	     no_argument,	NULL, OPT_LAPTOP },
>  			{"loops",            required_argument, NULL, OPT_LOOPS },
>  			{"mlockall",         no_argument,       NULL, OPT_MLOCKALL },
>  			{"refresh_on_max",   no_argument,       NULL, OPT_REFRESH },
> @@ -1445,6 +1455,8 @@ static void process_options (int argc, char *argv[], int max_cpus)
>  			handlepolicy(optarg); break;
>  		case OPT_DBGCYCLIC:
>  			ct_debug = 1; break;
> +		case OPT_LAPTOP:
> +			laptop = 1; break;
>  		}
>  	}
>  
> -- 
> 1.8.1.4
> 
> 

Re: [PATCH 6/6] cyclictest: Add long option --laptop to preserve battery power

[Michael]

On 08/14/2014 06:18 PM, John Kacur wrote:
> Some people running cyclictest on laptops don't want to automatically
> take advantage of the trick that prevents the power management to
> transistion to high cstates, since it eats up their battery power.

s/transistion/transition/

Re: [PATCH 6/6] cyclictest: Add long option --laptop to preserve battery power

[John Kacur]

----- Original Message -----
> On 08/14/2014 06:18 PM, John Kacur wrote:
> > Some people running cyclictest on laptops don't want to automatically
> > take advantage of the trick that prevents the power management to
> > transistion to high cstates, since it eats up their battery power.
> 
> s/transistion/transition/
> 

Thanks