linux-kernel - [DEBUG 21/21] selftests/powerpc: Add a script to perform random VMA migrations

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Date:   Mon, 30 Jan 2017 09:06:02 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     mhocko@...e.com, vbabka@...e.cz, mgorman@...e.de,
        minchan@...nel.org, aneesh.kumar@...ux.vnet.ibm.com,
        bsingharora@...il.com, srikar@...ux.vnet.ibm.com,
        haren@...ux.vnet.ibm.com, jglisse@...hat.com,
        dave.hansen@...el.com, dan.j.williams@...el.com
Subject: [DEBUG 21/21] selftests/powerpc: Add a script to perform random VMA migrations

This is a test script which creates a workload (e.g ebizzy) and go through
it's VMAs (/proc/pid/maps) and initiate migration to random nodes which can
be either system memory node or coherent memory node.

Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
---
 tools/testing/selftests/vm/cdm_migration.sh | 77 +++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100755 tools/testing/selftests/vm/cdm_migration.sh

diff --git a/tools/testing/selftests/vm/cdm_migration.sh b/tools/testing/selftests/vm/cdm_migration.sh
new file mode 100755
index 0000000..3ded302
--- /dev/null
+++ b/tools/testing/selftests/vm/cdm_migration.sh
@@ -0,0 +1,77 @@
+#!/usr/bin/bash
+#
+# Should work with any workoad and workload commandline.
+# But for now ebizzy should be installed. Please run it
+# as root.
+#
+# Copyright (C) Anshuman Khandual 2016, IBM Corporation
+#
+# Licensed under GPL V2
+
+# Unload, build and reload modules
+if [ "$1" = "reload" ]
+then
+	rmmod coherent_memory_demo
+	rmmod coherent_hotplug_demo
+	cd ../../../../
+	make -s -j 64 modules
+	insmod drivers/char/coherent_hotplug_demo.ko
+	insmod drivers/char/coherent_memory_demo.ko
+	cd -
+fi
+
+# Workload
+workload=ebizzy
+work_cmd="ebizzy -T -z -m -t 128 -n 100000 -s 32768 -S 10000"
+
+pkill $workload
+$work_cmd &
+
+# File
+if [ -e input_file.txt ]
+then
+	rm input_file.txt
+fi
+
+# Inputs
+pid=`pidof ebizzy`
+cp /proc/$pid/maps input_file.txt
+if [ ! -e input_file.txt ]
+then
+	echo "Input file was not created"
+	exit
+fi
+input=input_file.txt
+
+# Migrations
+dmesg -C
+while read line
+do
+	addr_start=$(echo $line | cut -d '-' -f1)
+	addr_end=$(echo $line | cut -d '-' -f2 | cut -d ' ' -f1)
+	node=`expr $RANDOM % 5`
+
+	echo $pid,0x$addr_start,0x$addr_end,$node > \
+			/sys/kernel/debug/coherent_debug
+done < "$input"
+
+# Analyze dmesg output
+passed=`dmesg | grep "migration_passed" | wc -l`
+failed=`dmesg | grep "migration_failed" | wc -l`
+queuef=`dmesg | grep "queue_pages_range_failed" | wc -l`
+empty=`dmesg | grep "list_empty" | wc -l`
+missing=`dmesg | grep "vma_missing" | wc -l`
+
+# Stats
+echo passed	$passed
+echo failed	$failed
+echo queuef	$queuef
+echo empty	$empty
+echo missing	$missing
+
+# Cleanup
+rm input_file.txt
+if pgrep -x $workload > /dev/null
+then
+	pkill $workload
+fi
-- 
2.9.3