linux-kernel - [PATCH v3 rcu 7/8] rcutorture: Avoid torture.sh compressing identical files

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Date:   Wed, 19 Oct 2022 16:02:05 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com,
        rostedt@...dmis.org, "Paul E. McKenney" <paulmck@...nel.org>
Subject: [PATCH v3 rcu 7/8] rcutorture: Avoid torture.sh compressing identical files

Currently, torture.sh will compress the vmlinux files for KASAN and
KCSAN runs.  But it will compress all of the files, including those
copied verbatim by the kvm-again.sh script.  Compression takes around ten
minutes, so this is not a good thing.  This commit therefore compresses
only one of a given set of identical vmlinux files, and then hard-links
it to the directories produced by kvm-again.sh.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 .../selftests/rcutorture/bin/torture.sh       | 21 ++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/rcutorture/bin/torture.sh b/tools/testing/selftests/rcutorture/bin/torture.sh
index b376688fe280a..fc63539377147 100755
--- a/tools/testing/selftests/rcutorture/bin/torture.sh
+++ b/tools/testing/selftests/rcutorture/bin/torture.sh
@@ -536,7 +536,10 @@ if test -n "$tdir" && test $compress_concurrency -gt 0
 then
 	# KASAN vmlinux files can approach 1GB in size, so compress them.
 	echo Looking for K[AC]SAN files to compress: `date` > "$tdir/log-xz" 2>&1
-	find "$tdir" -type d -name '*-k[ac]san' -print > $T/xz-todo
+	find "$tdir" -type d -name '*-k[ac]san' -print > $T/xz-todo-all
+	find "$tdir" -type f -name 're-run' -print | sed -e 's,/re-run,,' |
+		grep -e '-k[ac]san$' > $T/xz-todo-copy
+	sort $T/xz-todo-all $T/xz-todo-copy | uniq -u > $T/xz-todo
 	ncompresses=0
 	batchno=1
 	if test -s $T/xz-todo
@@ -568,6 +571,22 @@ then
 			echo Waiting for final batch $batchno of $ncompresses compressions `date` | tee -a "$tdir/log-xz" | tee -a $T/log
 		fi
 		wait
+		if test -s $T/xz-todo-copy
+		then
+			echo Linking vmlinux.xz files to re-use scenarios `date` | tee -a "$tdir/log-xz" | tee -a $T/log
+			dirstash="`pwd`"
+			for i in `cat $T/xz-todo-copy`
+			do
+				cd $i
+				find "$i" -name vmlinux -print > $T/xz-todo-copy-vmlinux
+				for v in `cat $T/xz-todo-copy-vmlinux`
+				do
+					rm -f "$v"
+					cp -l "$i/$v".xz "`dirname "$v"`"
+				done
+				cd "$dirstash"
+			done
+		fi
 		echo Size after compressing $n2compress files: `du -sh $tdir | awk '{ print $1 }'` `date` 2>&1 | tee -a "$tdir/log-xz" | tee -a $T/log
 		echo Total duration `get_starttime_duration $starttime`. | tee -a $T/log
 	else
-- 
2.31.1.189.g2e36527f23