#!/bin/sh

################################################################################
# options 

while getopts ckh flag
do
	case $flag in
		c)
			RUN_COMBINED=true
			;;
		k)
			KEEP_EXISTING_DATA=true
			;;
		h)
			echo "Usage: $0 [-c] [case-*]"
			exit
			;;
	esac
done
shift $(($OPTIND - 1))

[ $(whoami) != root ] && echo "root privilege required" && exit

################################################################################
# stats

reset_stats () {
	echo 0 > /proc/lock_stat
	echo 1 > /sys/kernel/debug/gcov/reset
}

save_stats () {
	base_dir=$(pwd)
	mkdir -p $1
	(
	cd $1
	cp /proc/lock_stat . && chmod go+r lock_stat
	$base_dir/gcov-mm
	$base_dir/gcov-fun  mm/*.?.gcov | sort -nr     > top-functions
	$base_dir/gcov-lock mm/*.?.gcov | sort -nr -k4 > top-locks
	rm mm/*.gcno mm/*.gcda
	)
}

perf_events="
cpu-cycles
instructions
cache-references
cache-misses
branch-instructions
branch-misses
bus-cycles
cpu-clock
task-clock
page-faults
minor-faults
major-faults
context-switches
cpu-migrations
LLC-loads
LLC-load-misses
LLC-stores
LLC-store-misses
LLC-prefetches
LLC-prefetch-misses
dTLB-loads
dTLB-load-misses
dTLB-stores
dTLB-store-misses
lock:lock_acquire
lock:lock_release
lock:lock_contended
lock:lock_acquired
syscalls:sys_enter_mmap
syscalls:sys_enter_mmap_pgoff
syscalls:sys_enter_brk
syscalls:sys_enter_msync
syscalls:sys_enter_mremap
syscalls:sys_enter_mprotect
syscalls:sys_enter_mbind
syscalls:sys_enter_migrate_pages
syscalls:sys_enter_mlock
syscalls:sys_enter_munlock
syscalls:sys_enter_mlockall
syscalls:sys_enter_munlockall
syscalls:sys_enter_remap_file_pages
"
perf_events=$(echo $perf_events | sed 's/ / -e /g')

################################################################################
# run it

. ./hw_vars

OUT_DIR=$(hostname)-${nr_task}c-$(((mem + (1<<29))>>30))g
TEST_CASES=${@:-$(echo case-*)}

echo $((1<<30)) > /proc/sys/vm/max_map_count
echo $((1<<20)) > /proc/sys/kernel/threads-max
echo 1 > /proc/sys/vm/overcommit_memory
echo 3 > /proc/sys/vm/drop_caches

mount_tmpfs
create_sparse_root

for testcase in $TEST_CASES
do
	[ "${testcase#*000}" != "$testcase" ] && continue
	[ -x "./$testcase" ] || continue
	[[ -n $KEEP_EXISTING_DATA && -d $OUT_DIR/$testcase ]] && continue
	reset_stats
	echo $testcase
	./$testcase || break
	save_stats $OUT_DIR/$testcase

	# run again to collect perf stats
	perf stat -a -e $perf_events -o $OUT_DIR/$testcase/perf-stat ./$testcase

	perf record -afg -o $TMPFS_MNT/perf.data ./$testcase 2>/dev/null || continue
	perf report -g fractal,5 -i $TMPFS_MNT/perf.data 2>/dev/null > $OUT_DIR/$testcase/perf-report
done

./elapsed-time $OUT_DIR

remove_tmpfs
remove_sparse_root

################################################################################
# run combined

[ -z "$RUN_COMBINED" ] && exit # only run combined cases when asked

kill_detached() {
	for pidfile in $SPARSE_ROOT/*.pid
	do
		[ -s "$pidfile" ] && kill -INT $(cat $pidfile)
		rm $pidfile
	done
}

for testcase in $TEST_CASES
do
	for testcase2 in $TEST_CASES
	do
		[ -x "./$testcase" ] || continue
		[ -x "./$testcase2" ] || continue
		[ $testcase = $testcase2 ] && continue
		order="$testcase\n$testcase2"
		order2=$(echo $order | sort)
		[ $order != $order2 ] && continue
		[ "${testcase2#*000}" != "$testcase2" ] && continue
		reset_stats
		if [ "${testcase#*000}" != "$testcase" ]; then
			./$testcase  # take some memory (mem/3)
			./$testcase2 # flush memory (mem*10)
		else
			./$testcase  &
			./$testcase2 &
			wait
		fi
		save_stats $OUT_DIR/$testcase-$testcase2
		kill_detached
	done
done