Adding upstream version 1.29.3.upstream/1.29.3upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 227 insertions, 0 deletions

diff --git a/collectors/charts.d.plugin/loopsleepms.sh.inc b/collectors/charts.d.plugin/loopsleepms.sh.inc
new file mode 100644
index 0000000..c386083
--- /dev/null
+++ b/collectors/charts.d.plugin/loopsleepms.sh.inc
@@ -0,0 +1,227 @@
+# no need for shebang - this file is included from other scripts
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+LOOPSLEEP_DATE="$(which date 2>/dev/null || command -v date 2>/dev/null)"
+if [ -z "$LOOPSLEEP_DATE" ]; then
+	echo >&2 "$0: ERROR: Cannot find the command 'date' in the system path."
+	exit 1
+fi
+
+# -----------------------------------------------------------------------------
+# use the date command as a high resolution timer
+
+# macOS 'date' doesnt support '%N' precision
+# echo $(/bin/date +"%N") is "N"
+if [ "$($LOOPSLEEP_DATE +"%N")" = "N" ]; then
+  LOOPSLEEP_DATE_FORMAT="%s * 1000"
+else
+  LOOPSLEEP_DATE_FORMAT="%s * 1000 + 10#%-N / 1000000"
+fi
+
+now_ms=
+LOOPSLEEPMS_HIGHRES=1
+test "$($LOOPSLEEP_DATE +%N)" = "%N" && LOOPSLEEPMS_HIGHRES=0
+test -z "$($LOOPSLEEP_DATE +%N)" && LOOPSLEEPMS_HIGHRES=0
+current_time_ms_from_date() {
+  if [ $LOOPSLEEPMS_HIGHRES -eq 0 ]; then
+    now_ms="$($LOOPSLEEP_DATE +'%s')000"
+  else
+    now_ms="$(($($LOOPSLEEP_DATE +"$LOOPSLEEP_DATE_FORMAT")))"
+  fi
+}
+
+# -----------------------------------------------------------------------------
+# use /proc/uptime as a high resolution timer
+
+current_time_ms_from_date
+current_time_ms_from_uptime_started="${now_ms}"
+current_time_ms_from_uptime_last="${now_ms}"
+current_time_ms_from_uptime_first=0
+current_time_ms_from_uptime() {
+	local up rest arr=() n
+
+	read up rest </proc/uptime
+	if [ $? -ne 0 ]; then
+		echo >&2 "$0: Cannot read /proc/uptime - falling back to current_time_ms_from_date()."
+		current_time_ms="current_time_ms_from_date"
+		current_time_ms_from_date
+		current_time_ms_accuracy=1
+		return
+	fi
+
+	arr=(${up//./ })
+
+	if [ ${#arr[1]} -lt 1 ]; then
+		n="${arr[0]}000"
+	elif [ ${#arr[1]} -lt 2 ]; then
+		n="${arr[0]}${arr[1]}00"
+	elif [ ${#arr[1]} -lt 3 ]; then
+		n="${arr[0]}${arr[1]}0"
+	else
+		n="${arr[0]}${arr[1]}"
+	fi
+
+	now_ms=$((current_time_ms_from_uptime_started - current_time_ms_from_uptime_first + n))
+
+	if [ "${now_ms}" -lt "${current_time_ms_from_uptime_last}" ]; then
+		echo >&2 "$0: Cannot use current_time_ms_from_uptime() - new time ${now_ms} is older than the last ${current_time_ms_from_uptime_last} - falling back to current_time_ms_from_date()."
+		current_time_ms="current_time_ms_from_date"
+		current_time_ms_from_date
+		current_time_ms_accuracy=1
+	fi
+
+	current_time_ms_from_uptime_last="${now_ms}"
+}
+current_time_ms_from_uptime
+current_time_ms_from_uptime_first="$((now_ms - current_time_ms_from_uptime_started))"
+current_time_ms_from_uptime_last="${current_time_ms_from_uptime_first}"
+current_time_ms="current_time_ms_from_uptime"
+current_time_ms_accuracy=10
+if [ "${current_time_ms_from_uptime_first}" -eq 0 ]; then
+	echo >&2 "$0: Invalid setup for current_time_ms_from_uptime() - falling back to current_time_ms_from_date()."
+	current_time_ms="current_time_ms_from_date"
+	current_time_ms_accuracy=1
+fi
+
+# -----------------------------------------------------------------------------
+# use read with timeout for sleep
+
+mysleep=""
+
+mysleep_fifo="${NETDATA_CACHE_DIR-/tmp}/.netdata_bash_sleep_timer_fifo"
+[ -f "${mysleep_fifo}" ] && rm "${mysleep_fifo}"
+[ ! -p "${mysleep_fifo}" ] && mkfifo "${mysleep_fifo}"
+[ -p "${mysleep_fifo}" ] && mysleep="mysleep_read"
+
+mysleep_read() {
+	read -t "${1}" <>"${mysleep_fifo}"
+	ret=$?
+	if [ $ret -le 128 ]; then
+		echo >&2 "$0: Cannot use read for sleeping (return code ${ret})."
+		mysleep="sleep"
+		${mysleep} "${1}"
+	fi
+}
+
+# -----------------------------------------------------------------------------
+# use bash loadable module for sleep
+
+mysleep_builtin() {
+	builtin sleep "${1}"
+	ret=$?
+	if [ $ret -ne 0 ]; then
+		echo >&2 "$0: Cannot use builtin sleep for sleeping (return code ${ret})."
+		mysleep="sleep"
+		${mysleep} "${1}"
+	fi
+}
+
+if [ -z "${mysleep}" -a "$((BASH_VERSINFO[0] + 0))" -ge 3 -a "${NETDATA_BASH_LOADABLES}" != "DISABLE" ]; then
+	# enable modules only for bash version 3+
+
+	for bash_modules_path in ${BASH_LOADABLES_PATH//:/ } "$(pkg-config bash --variable=loadablesdir 2>/dev/null)" "/usr/lib/bash" "/lib/bash" "/lib64/bash" "/usr/local/lib/bash" "/usr/local/lib64/bash"; do
+		[ -z "${bash_modules_path}" -o ! -d "${bash_modules_path}" ] && continue
+
+		# check for sleep
+		for bash_module_sleep in "sleep" "sleep.so"; do
+			if [ -f "${bash_modules_path}/${bash_module_sleep}" ]; then
+				if enable -f "${bash_modules_path}/${bash_module_sleep}" sleep 2>/dev/null; then
+					mysleep="mysleep_builtin"
+					# echo >&2 "$0: Using bash loadable ${bash_modules_path}/${bash_module_sleep} for sleep"
+					break
+				fi
+			fi
+
+		done
+
+		[ ! -z "${mysleep}" ] && break
+	done
+fi
+
+# -----------------------------------------------------------------------------
+# fallback to external sleep
+
+[ -z "${mysleep}" ] && mysleep="sleep"
+
+# -----------------------------------------------------------------------------
+# this function is used to sleep a fraction of a second
+# it calculates the difference between every time is called
+# and tries to align the sleep time to give you exactly the
+# loop you need.
+
+LOOPSLEEPMS_LASTRUN=0
+LOOPSLEEPMS_NEXTRUN=0
+LOOPSLEEPMS_LASTSLEEP=0
+LOOPSLEEPMS_LASTWORK=0
+
+loopsleepms() {
+	local tellwork=0 t="${1}" div s m now mstosleep
+
+	if [ "${t}" = "tellwork" ]; then
+		tellwork=1
+		shift
+		t="${1}"
+	fi
+
+	# $t = the time in seconds to wait
+
+	# if high resolution is not supported
+	# just sleep the time requested, in seconds
+	if [ ${LOOPSLEEPMS_HIGHRES} -eq 0 ]; then
+		sleep ${t}
+		return
+	fi
+
+	# get the current time, in ms in ${now_ms}
+	${current_time_ms}
+
+	# calculate ms since last run
+	[ ${LOOPSLEEPMS_LASTRUN} -gt 0 ] &&
+		LOOPSLEEPMS_LASTWORK=$((now_ms - LOOPSLEEPMS_LASTRUN - LOOPSLEEPMS_LASTSLEEP + current_time_ms_accuracy))
+	# echo "# last loop's work took $LOOPSLEEPMS_LASTWORK ms"
+
+	# remember this run
+	LOOPSLEEPMS_LASTRUN=${now_ms}
+
+	# calculate the next run
+	LOOPSLEEPMS_NEXTRUN=$(((now_ms - (now_ms % (t * 1000))) + (t * 1000)))
+
+	# calculate ms to sleep
+	mstosleep=$((LOOPSLEEPMS_NEXTRUN - now_ms + current_time_ms_accuracy))
+	# echo "# mstosleep is $mstosleep ms"
+
+	# if we are too slow, sleep some time
+	test ${mstosleep} -lt 200 && mstosleep=200
+
+	s=$((mstosleep / 1000))
+	m=$((mstosleep - (s * 1000)))
+	[ "${m}" -lt 100 ] && m="0${m}"
+	[ "${m}" -lt 10 ] && m="0${m}"
+
+	test $tellwork -eq 1 && echo >&2 " >>> PERFORMANCE >>> WORK TOOK ${LOOPSLEEPMS_LASTWORK} ms ( $((LOOPSLEEPMS_LASTWORK * 100 / 1000)).$((LOOPSLEEPMS_LASTWORK % 10))% cpu ) >>> SLEEPING ${mstosleep} ms"
+
+	# echo "# sleeping ${s}.${m}"
+	# echo
+	${mysleep} ${s}.${m}
+
+	# keep the values we need
+	# for our next run
+	LOOPSLEEPMS_LASTSLEEP=$mstosleep
+}
+
+# test it
+#while [ 1 ]
+#do
+#    r=$(( (RANDOM * 2000 / 32767) ))
+#    s=$((r / 1000))
+#    m=$((r - (s * 1000)))
+#    [ "${m}" -lt 100 ] && m="0${m}"
+#    [ "${m}" -lt 10  ] && m="0${m}"
+#    echo "${r} = ${s}.${m}"
+#
+#    # the work
+#    ${mysleep} ${s}.${m}
+#
+#    # the alignment loop
+#    loopsleepms tellwork 1
+#done