From 7dd8a2f4d351ce8975c0af122732a2a12697c8cc Mon Sep 17 00:00:00 2001 From: Kairui Song Date: Wed, 8 Apr 2020 20:09:38 +0800 Subject: [PATCH] Add 99memstrack module memstrack is a new tool to track the overall memory usage and allocation, which can help off load the improve the builtin module memory tracing function in dracut. With this change, the rd.memdebug=4 behavior is similiar with before, but the report is defered to pre-pivot, so the memory usage info during the whole initramfs run is traced. And the ourput format is changed a bit: dracut-pre-pivot[519]: ======== Report format module_summary: ======== dracut-pre-pivot[519]: Module squashfs using 10.4MB (2658 pages), peak allocation 10.4MB (2671 pages) dracut-pre-pivot[519]: Module qxl using 3.4MB (865 pages), peak allocation 3.4MB (880 pages) dracut-pre-pivot[519]: Module crc32c_intel using 2.0MB (519 pages), peak allocation 3.0MB (769 pages) dracut-pre-pivot[519]: Module serio_raw using 2.0MB (505 pages), peak allocation 3.6MB (918 pages) dracut-pre-pivot[519]: Module virtio_console using 1.6MB (416 pages), peak allocation 1.6MB (419 pages) ... snip ... dracut-pre-pivot[519]: ======== Report format module_summary END ======== It now contains more detail and also includes the peak usage which could be more helpful. And now it have a rd.memdebug=5, which will print more detail about the stack trace of the top memory user, also printed on pri-pivot: dracut-pre-pivot[519]: ======== Report format module_top: ======== dracut-pre-pivot[519]: Top stack usage of module squashfs: dracut-pre-pivot[519]: (null) Pages: 2658 (peak: 2671) dracut-pre-pivot[519]: (null) Pages: 2658 (peak: 2671) dracut-pre-pivot[519]: async_page_fault (0xffffffff81a01149) Pages: 1448 (peak: 1461) dracut-pre-pivot[519]: do_async_page_fault (0xffffffff8105c509) Pages: 1448 (peak: 1461) dracut-pre-pivot[519]: do_page_fault (0xffffffff8106296a) Pages: 1448 (peak: 1461) dracut-pre-pivot[519]: do_user_addr_fault (0xffffffff810626bd) Pages: 1448 (peak: 1461) dracut-pre-pivot[519]: handle_mm_fault (0xffffffff812940c4) Pages: 1448 (peak: 1461) dracut-pre-pivot[519]: __handle_mm_fault (0xffffffff81293627) Pages: 1195 (peak: 1208) dracut-pre-pivot[519]: __do_fault (0xffffffff8128b07e) Pages: 1195 (peak: 1208) dracut-pre-pivot[519]: filemap_fault (0xffffffff8124c0b9) Pages: 1195 (peak: 1208) dracut-pre-pivot[519]: __do_page_cache_readahead (0xffffffff812585da) Pages: 1063 (peak: 1076) dracut-pre-pivot[519]: read_pages (0xffffffff812583c2) Pages: 1063 (peak: 1076) dracut-pre-pivot[519]: squashfs_readpage squashfs (0xffffffffc0022073) Pages: 1039 (peak: 1052) dracut-pre-pivot[519]: squashfs_readpage_block squashfs (0xffffffffc0024334) Pages: 744 (peak: 744) dracut-pre-pivot[519]: squashfs_copy_cache squashfs (0xffffffffc0021a3f) Pages: 744 (peak: 744) dracut-pre-pivot[519]: pagecache_get_page (0xffffffff8124abf7) Pages: 744 (peak: 744) dracut-pre-pivot[519]: __page_cache_alloc (0xffffffff81247df6) Pages: 744 (peak: 744) dracut-pre-pivot[519]: alloc_pages_current (0xffffffff812cdca7) Pages: 744 (peak: 744) dracut-pre-pivot[519]: __alloc_pages_nodemask (0xffffffff812b3107) Pages: 744 (peak: 744) dracut-pre-pivot[519]: __alloc_pages_nodemask (0xffffffff812b3107) Pages: 1488 (peak: 1488) dracut-pre-pivot[519]: Top stack usage of module qxl: dracut-pre-pivot[519]: (null) Pages: 865 (peak: 880) dracut-pre-pivot[519]: entry_SYSCALL_64_after_hwframe (0xffffffff81a0008c) Pages: 855 (peak: 858) dracut-pre-pivot[519]: do_syscall_64 (0xffffffff81002a5a) Pages: 855 (peak: 858) dracut-pre-pivot[519]: __x64_sys_finit_module (0xffffffff8117ccea) Pages: 811 (peak: 811) dracut-pre-pivot[519]: __do_sys_finit_module (0xffffffff8117cc6e) Pages: 811 (peak: 811) dracut-pre-pivot[519]: load_module (0xffffffff8117c6be) Pages: 802 (peak: 802) dracut-pre-pivot[519]: do_init_module (0xffffffff81179e72) Pages: 802 (peak: 802) dracut-pre-pivot[519]: do_one_initcall (0xffffffff81000d5a) Pages: 802 (peak: 802) dracut-pre-pivot[519]: serio_raw_poll serio_raw (0xffffffffc0200054) Pages: 802 (peak: 802) dracut-pre-pivot[519]: __pci_register_driver (0xffffffff81557804) Pages: 802 (peak: 802) dracut-pre-pivot[519]: driver_register (0xffffffff8167ed24) Pages: 802 (peak: 802) dracut-pre-pivot[519]: bus_add_driver (0xffffffff8167cbb2) Pages: 801 (peak: 801) dracut-pre-pivot[519]: driver_attach (0xffffffff8167d28e) Pages: 801 (peak: 801) dracut-pre-pivot[519]: bus_for_each_dev (0xffffffff8167b62c) Pages: 801 (peak: 801) dracut-pre-pivot[519]: __driver_attach (0xffffffff8167e18f) Pages: 801 (peak: 801) dracut-pre-pivot[519]: device_driver_attach (0xffffffff8167e0ed) Pages: 801 (peak: 801) dracut-pre-pivot[519]: driver_probe_device (0xffffffff8167de6c) Pages: 801 (peak: 801) dracut-pre-pivot[519]: really_probe (0xffffffff8167d9c9) Pages: 801 (peak: 801) dracut-pre-pivot[519]: pci_device_probe (0xffffffff81559627) Pages: 801 (peak: 801) dracut-pre-pivot[519]: local_pci_probe (0xffffffff81557f98) Pages: 801 (peak: 801) dracut-pre-pivot[519]: qxl_pci_probe qxl (0xffffffffc01f0387) Pages: 773 (peak: 773) dracut-pre-pivot[519]: drm_fbdev_generic_setup drm_kms_helper (0xffffffffc01b30c5) Pages: 773 (peak: 773) dracut-pre-pivot[519]: drm_fbdev_client_hotplug drm_kms_helper (0xffffffffc01b2656) Pages: 773 (peak: 773) dracut-pre-pivot[519]: __drm_fb_helper_initial_config_and_unlock drm_kms_helper (0xffffffffc01b1a28) Pages: 770 (peak: 770) dracut-pre-pivot[519]: drm_fb_helper_generic_probe drm_kms_helper (0xffffffffc01b2fa5) Pages: 770 (peak: 770) dracut-pre-pivot[519]: vzalloc (0xffffffff812aa39c) Pages: 770 (peak: 770) dracut-pre-pivot[519]: __vmalloc_node_range (0xffffffff812aa200) Pages: 768 (peak: 768) ... snip ... ======== Report format module_top END ======== This could be very helpful for debuging memory usage issues. --- dracut.cmdline.7.asc | 16 +++++--- dracut.spec | 2 + modules.d/99base/dracut-lib.sh | 2 +- modules.d/99memstrack/memstrack-report.sh | 23 +++++++++++ modules.d/99memstrack/memstrack-start.sh | 68 +++++++++++++++++++++++++++++++ modules.d/99memstrack/memstrack.service | 13 ++++++ modules.d/99memstrack/module-setup.sh | 27 ++++++++++++ 7 files changed, 144 insertions(+), 7 deletions(-) diff --git a/dracut.cmdline.7.asc b/dracut.cmdline.7.asc index c53601ea..4d4970c8 100644 --- a/dracut.cmdline.7.asc +++ b/dracut.cmdline.7.asc @@ -188,8 +188,8 @@ It should be attached to any report about dracut problems. _/run/initramfs/init.log_. If "quiet" is set, it also logs to the console. -**rd.memdebug=[0-3]**:: - Print memory usage info at various points, set the verbose level from 0 to 4. +**rd.memdebug=[0-5]**:: + Print memory usage info at various points, set the verbose level from 0 to 5. + Higher level means more debugging output: + @@ -198,10 +198,14 @@ It should be attached to any report about dracut problems. 1 - partial /proc/meminfo 2 - /proc/meminfo 3 - /proc/meminfo + /proc/slabinfo - 4 - /proc/meminfo + /proc/slabinfo + tracekomem - NOTE: tracekomem is a shell script utilizing kernel trace to track - the rough total memory consumption of kernel modules during - loading. It may override other trace configurations. + 4 - /proc/meminfo + /proc/slabinfo + memstrack summary + NOTE: memstrack is a memory tracing tool that tracks the total memory + consumption, and peak memory consumption of each kernel modules + and userspace progress during the whole initramfs runtime, report + is genereted and the end of initramsfs run. + 5 - /proc/meminfo + /proc/slabinfo + memstrack (with top memory stacktrace) + NOTE: memstrack (with top memory stacktrace) will print top memory + allocation stack traces during the whole initramfs runtime. ---- **rd.break**:: diff --git a/dracut.spec b/dracut.spec index 0369dde6..1eb47402 100644 --- a/dracut.spec +++ b/dracut.spec @@ -77,6 +77,7 @@ Requires: xz Requires: gzip %if 0%{?fedora} || 0%{?rhel} +Recommends: memstrack Recommends: hardlink Recommends: pigz Recommends: kpartx @@ -403,6 +404,7 @@ install -m 0755 51-dracut-rescue-postinst.sh $RPM_BUILD_ROOT%{_sysconfdir}/kerne %{dracutlibdir}/modules.d/98syslog %{dracutlibdir}/modules.d/98usrmount %{dracutlibdir}/modules.d/99base +%{dracutlibdir}/modules.d/99memstrack %{dracutlibdir}/modules.d/99fs-lib %{dracutlibdir}/modules.d/99shutdown %attr(0644,root,root) %ghost %config(missingok,noreplace) %{_localstatedir}/log/dracut.log diff --git a/modules.d/99base/dracut-lib.sh b/modules.d/99base/dracut-lib.sh index b7020892..e602bacb 100755 --- a/modules.d/99base/dracut-lib.sh +++ b/modules.d/99base/dracut-lib.sh @@ -1187,7 +1187,7 @@ are_lists_eq() { setmemdebug() { if [ -z "$DEBUG_MEM_LEVEL" ]; then - export DEBUG_MEM_LEVEL=$(getargnum 0 0 3 rd.memdebug) + export DEBUG_MEM_LEVEL=$(getargnum 0 0 5 rd.memdebug) fi } diff --git a/modules.d/99memstrack/memstrack-report.sh b/modules.d/99memstrack/memstrack-report.sh new file mode 100755 index 00000000..241e8621 --- /dev/null +++ b/modules.d/99memstrack/memstrack-report.sh @@ -0,0 +1,23 @@ +#!/usr/bin/env bash +. /lib/dracut-lib.sh + +if ! [ "$DEBUG_MEM_LEVEL" -ge 4 ]; then + exit 0 +fi + +if type -P systemctl >/dev/null; then + systemctl stop memstrack.service +else + get_pid_of_tracer () { + local _user _pid _rest + read _user _pid _rest <<< $(ps aux | grep [m]emstrack | head -1) + echo $_pid + } + + kill -s INT $(get_pid_of_tracer) + while [[ -n $(get_pid_of_tracer) ]]; do + sleep 1 + done +fi + +cat /.memstrack diff --git a/modules.d/99memstrack/memstrack-start.sh b/modules.d/99memstrack/memstrack-start.sh new file mode 100755 index 00000000..5aa73efe --- /dev/null +++ b/modules.d/99memstrack/memstrack-start.sh @@ -0,0 +1,68 @@ +#!/bin/sh +# Mount kernel debug fs so debug tools can work. +# memdebug=4 and memdebug=5 requires debug fs to be mounted. +# And there is no need to umount it. + +type getargnum >/dev/null 2>&1 || . /lib/dracut-lib.sh + +# "sys/kernel/tracing" has the priority if exists. +get_trace_base() { + # trace access through debugfs would be obsolete if "/sys/kernel/tracing" is available. + if [ -d "/sys/kernel/tracing" ]; then + echo "/sys/kernel" + else + echo "/sys/kernel/debug" + fi +} + +is_debugfs_ready() { + [ -f "$(get_trace_base)/tracing/trace" ] +} + +prepare_debugfs() { + local trace_base + + trace_base=$(get_trace_base) + # old debugfs interface case. + if ! [ -d "$trace_base/tracing" ]; then + mount none -t debugfs $trace_base + # new tracefs interface case. + elif ! [ -f "$trace_base/tracing/trace" ]; then + mount none -t tracefs "$trace_base/tracing" + fi + + if ! [ -f "$trace_base/tracing/trace" ]; then + echo "WARN: failed to mount debugfs" + return 1 + fi +} + +if ! is_debugfs_ready ; then + prepare_debugfs +fi + +if [ -n "$DEBUG_MEM_LEVEL" ]; then + if [ "$DEBUG_MEM_LEVEL" -ge 5 ]; then + echo "memstrack - will report kernel module memory usage summary and top allocation stack" + memstrack --report module_summary,module_top --notui --throttle 80 -o /.memstrack & + elif [ "$DEBUG_MEM_LEVEL" -ge 4 ]; then + echo "memstrack - will report memory usage summary" + memstrack --report module_summary --notui --throttle 80 -o /.memstrack & + else + exit 0; + fi +fi + +PID=$! +RET=$? + +if [ $RET -ne 0 ]; then + echo "Failed to start memstrack, exit status: $RET" + exit $RET +fi + +# Wait a second for memstrack to setup everything, avoid missing any event +sleep 1 + +echo $PID > /run/memstrack.pid +disown diff --git a/modules.d/99memstrack/memstrack.service b/modules.d/99memstrack/memstrack.service new file mode 100644 index 00000000..6b47adef --- /dev/null +++ b/modules.d/99memstrack/memstrack.service @@ -0,0 +1,13 @@ +[Unit] +Description=Memstrack Anylazing Service +DefaultDependencies=no +Before=dracut-cmdline.service systemd-udevd.service local-fs-pre.target +IgnoreOnIsolate=true + +[Service] +Type=simple +ExecStart=/bin/memstrack-start +PIDFile=/run/memstrack.pid +StandardInput=null +StandardOutput=syslog+console +StandardError=syslog+console diff --git a/modules.d/99memstrack/module-setup.sh b/modules.d/99memstrack/module-setup.sh new file mode 100755 index 00000000..d5bacb4d --- /dev/null +++ b/modules.d/99memstrack/module-setup.sh @@ -0,0 +1,27 @@ +#!/usr/bin/bash + +check() { + if type -P memstrack >/dev/null; then + dinfo "memstrack is available" + return 0 + fi + + dinfo "memstrack is not available" + dinfo "If you need to use rd.memdebug>=4, please install memstrack" + + return 1 +} + +depends() { + return 0 +} + +install() { + inst "/bin/memstrack" "/bin/memstrack" + + inst "$moddir/memstrack-start.sh" "/bin/memstrack-start" + inst_hook cleanup 99 "$moddir/memstrack-report.sh" + + inst "$moddir/memstrack.service" "$systemdsystemunitdir/memstrack.service" + systemctl -q --root "$initdir" add-wants initrd.target memstrack.service +}