[PATCH tip/core/rcu 12/20] rcutorture: Simplify logging

["Paul E. McKenney" <paulmck@linux.vnet.ibm.com>]

From: SeongJae Park <sj38.park@gmail.com>

Both the 'kvm.sh' and 'kvm-test-1-run.sh' scripts log messages by printing
the message to 'stdout' and then also printing it into the log file.
Generation of the message thus occurs twice, once for 'stdout' and once
for the log file.  Moreover, many of the messages contain 'date' output,
which results in date being invoked twice (once for stdout print, once
for log file write).  As a result, the date information in stdout and
log file can differ, which could cause confusion.

This commit therefore simplifies the logging procedure by using 'tee'.

Signed-off-by: SeongJae Park <sj38.park@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
 .../selftests/rcutorture/bin/kvm-test-1-run.sh     |  4 +--
 tools/testing/selftests/rcutorture/bin/kvm.sh      | 32 ++++++++--------------
 2 files changed, 12 insertions(+), 24 deletions(-)

diff --git a/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
index ab14b97c942c..0406c67378cb 100755
--- a/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh
@@ -154,9 +154,7 @@ cpu_count=`configfrag_boot_cpus "$boot_args" "$config_template" "$cpu_count"`
 vcpus=`identify_qemu_vcpus`
 if test $cpu_count -gt $vcpus
 then
-	echo CPU count limited from $cpu_count to $vcpus
-	touch $resdir/Warnings
-	echo CPU count limited from $cpu_count to $vcpus >> $resdir/Warnings
+	echo CPU count limited from $cpu_count to $vcpus | tee -a $resdir/Warnings
 	cpu_count=$vcpus
 fi
 qemu_args="`specify_qemu_cpus "$QEMU" "$qemu_args" "$cpu_count"`"
diff --git a/tools/testing/selftests/rcutorture/bin/kvm.sh b/tools/testing/selftests/rcutorture/bin/kvm.sh
index d2a4fd94de6a..7d1f607f0f76 100755
--- a/tools/testing/selftests/rcutorture/bin/kvm.sh
+++ b/tools/testing/selftests/rcutorture/bin/kvm.sh
@@ -331,8 +331,7 @@ awk < $T/cfgcpu.pack \
 # Dump out the scripting required to run one test batch.
 function dump(first, pastlast, batchnum)
 {
-	print "echo ----Start batch " batchnum ": `date`";
-	print "echo ----Start batch " batchnum ": `date` >> " rd "/log";
+	print "echo ----Start batch " batchnum ": `date` | tee -a " rd "log";
 	print "needqemurun="
 	jn=1
 	for (j = first; j < pastlast; j++) {
@@ -349,21 +348,18 @@ function dump(first, pastlast, batchnum)
 			ovf = "-ovf";
 		else
 			ovf = "";
-		print "echo ", cfr[jn], cpusr[jn] ovf ": Starting build. `date`";
-		print "echo ", cfr[jn], cpusr[jn] ovf ": Starting build. `date` >> " rd "/log";
+		print "echo ", cfr[jn], cpusr[jn] ovf ": Starting build. `date` | tee -a " rd "log";
 		print "rm -f " builddir ".*";
 		print "touch " builddir ".wait";
 		print "mkdir " builddir " > /dev/null 2>&1 || :";
 		print "mkdir " rd cfr[jn] " || :";
 		print "kvm-test-1-run.sh " CONFIGDIR cf[j], builddir, rd cfr[jn], dur " \"" TORTURE_QEMU_ARG "\" \"" TORTURE_BOOTARGS "\" > " rd cfr[jn]  "/kvm-test-1-run.sh.out 2>&1 &"
-		print "echo ", cfr[jn], cpusr[jn] ovf ": Waiting for build to complete. `date`";
-		print "echo ", cfr[jn], cpusr[jn] ovf ": Waiting for build to complete. `date` >> " rd "/log";
+		print "echo ", cfr[jn], cpusr[jn] ovf ": Waiting for build to complete. `date` | tee -a " rd "log";
 		print "while test -f " builddir ".wait"
 		print "do"
 		print "\tsleep 1"
 		print "done"
-		print "echo ", cfr[jn], cpusr[jn] ovf ": Build complete. `date`";
-		print "echo ", cfr[jn], cpusr[jn] ovf ": Build complete. `date` >> " rd "/log";
+		print "echo ", cfr[jn], cpusr[jn] ovf ": Build complete. `date` | tee -a " rd "log";
 		jn++;
 	}
 	for (j = 1; j < jn; j++) {
@@ -371,8 +367,7 @@ function dump(first, pastlast, batchnum)
 		print "rm -f " builddir ".ready"
 		print "if test -f \"" rd cfr[j] "/builtkernel\""
 		print "then"
-		print "\techo ----", cfr[j], cpusr[j] ovf ": Kernel present. `date`";
-		print "\techo ----", cfr[j], cpusr[j] ovf ": Kernel present. `date` >> " rd "/log";
+		print "\techo ----", cfr[j], cpusr[j] ovf ": Kernel present. `date` | tee -a " rd "log";
 		print "\tneedqemurun=1"
 		print "fi"
 	}
@@ -386,31 +381,26 @@ function dump(first, pastlast, batchnum)
 		njitter = ja[1];
 	if (TORTURE_BUILDONLY && njitter != 0) {
 		njitter = 0;
-		print "echo Build-only run, so suppressing jitter >> " rd "/log"
+		print "echo Build-only run, so suppressing jitter | tee -a " rd "log"
 	}
 	if (TORTURE_BUILDONLY) {
 		print "needqemurun="
 	}
 	print "if test -n \"$needqemurun\""
 	print "then"
-	print "\techo ---- Starting kernels. `date`";
-	print "\techo ---- Starting kernels. `date` >> " rd "/log";
+	print "\techo ---- Starting kernels. `date` | tee -a " rd "log";
 	for (j = 0; j < njitter; j++)
 		print "\tjitter.sh " j " " dur " " ja[2] " " ja[3] "&"
 	print "\twait"
-	print "\techo ---- All kernel runs complete. `date`";
-	print "\techo ---- All kernel runs complete. `date` >> " rd "/log";
+	print "\techo ---- All kernel runs complete. `date` | tee -a " rd "log";
 	print "else"
 	print "\twait"
-	print "\techo ---- No kernel runs. `date`";
-	print "\techo ---- No kernel runs. `date` >> " rd "/log";
+	print "\techo ---- No kernel runs. `date` | tee -a " rd "log";
 	print "fi"
 	for (j = 1; j < jn; j++) {
 		builddir=KVM "/b" j
-		print "echo ----", cfr[j], cpusr[j] ovf ": Build/run results:";
-		print "echo ----", cfr[j], cpusr[j] ovf ": Build/run results: >> " rd "/log";
-		print "cat " rd cfr[j]  "/kvm-test-1-run.sh.out";
-		print "cat " rd cfr[j]  "/kvm-test-1-run.sh.out >> " rd "/log";
+		print "echo ----", cfr[j], cpusr[j] ovf ": Build/run results: | tee -a " rd "log";
+		print "cat " rd cfr[j]  "/kvm-test-1-run.sh.out | tee -a " rd "log";
 	}
 }
 
-- 
2.5.2