linux-kernel - [PATCH] cyclictest: set "tracing

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Date:	Thu, 28 Jan 2010 14:50:59 +0800
From:	Yi Li <yi.li@...log.com>
To:	jkacur@...hat.com
CC:	williams@...hat.com, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	Yi Li <yi.li@...log.com>
Subject: [PATCH] cyclictest: set "tracing_thresh" optionally (resend)

Add an option "--tracing_thresh=THRESH" to set "tracing_thresh" of
current tracer, so it is not set to "tracelimit" by default.

Signed-off-by: Yi Li <yi.li@...log.com>
---
 src/cyclictest/cyclictest.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/cyclictest/cyclictest.c b/src/cyclictest/cyclictest.c
index dc86b49..1d32ec4 100644
--- a/src/cyclictest/cyclictest.c
+++ b/src/cyclictest/cyclictest.c
@@ -146,6 +146,7 @@ struct thread_stat {
 
 static int shutdown;
 static int tracelimit = 0;
+static int tracing_thresh = 0;
 static int ftrace = 0;
 static int kernelversion;
 static int verbose = 0;
@@ -387,8 +388,10 @@ static void setup_tracer(void)
 		char buffer[32];
 		int ret;
 
-		sprintf(buffer, "%d", tracelimit);
-		setkernvar("tracing_thresh", buffer);
+		if (tracing_thresh >= 0 && tracing_thresh <= tracelimit) {
+			sprintf(buffer, "%d", tracing_thresh);
+			setkernvar("tracing_thresh", buffer);
+		}
 
 		/* ftrace_enabled is a sysctl variable */
 		fileprefix = procfileprefix;
@@ -770,6 +773,7 @@ static void display_help(int error)
 	       "                           without -t default = 1\n"
 	       "-T TRACE --tracer=TRACER   set tracing function\n"
 	       "    configured tracers: %s\n"
+	       "--tracing_thresh=THRESH    set tracing_thresh of current tracer to THRESH\n"
 	       "-u       --unbuffered      force unbuffered output for live processing\n"
 	       "-v       --verbose         output values on stdout for statistics\n"
 	       "                           format: n:c:v n=tasknum c=count v=value in us\n"
@@ -903,6 +907,7 @@ static void process_options (int argc, char *argv[])
 			{"help", no_argument, NULL, '?'},
 			{"tracer", required_argument, NULL, 'T'},
 			{"traceopt", required_argument, NULL, 'O'},
+			{"tracing_thresh", required_argument, NULL, 1},
 			{"smp", no_argument, NULL, 'S'},
 			{"numa", no_argument, NULL, 'U'},
 			{NULL, 0, NULL, 0}
@@ -995,6 +1000,7 @@ static void process_options (int argc, char *argv[])
 #endif
 			break;
 		case '?': display_help(0); break;
+		case 1: tracing_thresh = atoi(optarg); break;
 		}
 	}
 
-- 
1.6.0.4

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