Port mkdumprd memory trace functions wrote by [email protected]
For kdump, memory usage tracing is important because there's limited
memory in kdump 2nd kernel.
Add a rd.memdebug cmdline for this. set rd.memdebug=<X> will set the
debug level to X which is the debug verbose level.
the format of cmdline is like below:
<level>[+]:<type>
<level> is the debug level
[+] means debug level >= <level>
<type> is the debug info type, as for this patch I added mem, iomem, slab
mem is for /proc/meminfo, iomem is for /proc/iomem, slab is for /proc/slabinfo
Also shortmem is the stripped /proc/meminfo which only includes 3 lines of
Memfree, Cached and Slab, for example:
MemFree: 6327176 kB
Cached: 741916 kB
Slab: 77284 kB
I added several trace point to the begin of several init hooks
At cmdline hooks I'm adding trace of "1+:mem 1+:iomem 3+:slab"
For other hooks I'm adding trace of "1:shortmem 2+:mem 3+:slab"
This means:
rd.memdebug=1)
cmdline hook: print mem and iomem
other hooks: print shortmem
rd.memdebug=2)
cmdline hook: print mem and iomem
other hooks: print mem
rd.memdebug=3):
cmdline hook: print mem iomem, and slabinfo
other hooks: print mem and slabinfo
*):
do not print any mem debug info
[v1->v2]: update to use getargnum with <minval> as argument
print iomem info at cmdline hook as well
Signed-off-by: Dave Young <[email protected]>
---
dracut.cmdline.7.asc | 4 +
modules.d/98systemd/dracut-cmdline.sh | 1
modules.d/98systemd/dracut-initqueue.sh | 1
modules.d/98systemd/dracut-pre-pivot.sh | 1
modules.d/98systemd/dracut-pre-trigger.sh | 1
modules.d/98systemd/dracut-pre-udev.sh | 1
modules.d/99base/dracut-lib.sh | 90 ++++++++++++++++++++++++++++++
7 files changed, 99 insertions(+)
--- dracut.orig/modules.d/98systemd/dracut-cmdline.sh
+++ dracut/modules.d/98systemd/dracut-cmdline.sh
@@ -18,6 +18,7 @@ type getarg >/dev/null 2>&1 || . /lib/dr
source_conf /etc/conf.d
+make_trace_mem "hook cmdline" 1+:mem 1+:iomem 3+:slab
# run scriptlets to parse the command line
getarg 'rd.break=cmdline' -d 'rdbreak=cmdline' && emergency_shell -n cmdline
"Break before cmdline"
source_hook cmdline
--- dracut.orig/modules.d/98systemd/dracut-initqueue.sh
+++ dracut/modules.d/98systemd/dracut-initqueue.sh
@@ -10,6 +10,7 @@ type getarg >/dev/null 2>&1 || . /lib/dr
source_conf /etc/conf.d
+make_trace_mem "hook initqueue" 1:shortmem 2+:mem 3+:slab
getarg 'rd.break=initqueue' -d 'rdbreak=initqueue' && emergency_shell -n
initqueue "Break before initqueue"
RDRETRY=$(getarg rd.retry -d 'rd_retry=')
--- dracut.orig/modules.d/98systemd/dracut-pre-pivot.sh
+++ dracut/modules.d/98systemd/dracut-pre-pivot.sh
@@ -10,6 +10,7 @@ type getarg >/dev/null 2>&1 || . /lib/dr
source_conf /etc/conf.d
+make_trace_mem "hook pre-pivot" 1:shortmem 2+:mem 3+:slab
# pre pivot scripts are sourced just before we doing cleanup and switch over
# to the new root.
getarg 'rd.break=pre-pivot' 'rdbreak=pre-pivot' && emergency_shell -n
pre-pivot "Break pre-pivot"
--- dracut.orig/modules.d/98systemd/dracut-pre-trigger.sh
+++ dracut/modules.d/98systemd/dracut-pre-trigger.sh
@@ -10,6 +10,7 @@ type getarg >/dev/null 2>&1 || . /lib/dr
source_conf /etc/conf.d
+make_trace_mem "hook pre-trigger" 1:shortmem 2+:mem 3+:slab
getargbool 0 rd.udev.info -n -y rdudevinfo && udevadm control
--log-priority=info
getargbool 0 rd.udev.debug -n -y rdudevdebug && udevadm control
--log-priority=debug
udevproperty "hookdir=$hookdir"
--- dracut.orig/modules.d/98systemd/dracut-pre-udev.sh
+++ dracut/modules.d/98systemd/dracut-pre-udev.sh
@@ -9,6 +9,7 @@ type getarg >/dev/null 2>&1 || . /lib/dr
source_conf /etc/conf.d
+make_trace_mem "hook pre-udev" 1:shortmem 2+:mem 3+:slab
# pre pivot scripts are sourced just before we doing cleanup and switch over
# to the new root.
getarg 'rd.break=pre-udev' 'rdbreak=pre-udev' && emergency_shell -n pre-udev
"Break pre-udev"
--- dracut.orig/dracut.cmdline.7.asc
+++ dracut/dracut.cmdline.7.asc
@@ -134,6 +134,10 @@ Debug
set -x for the dracut shell and logs to dmesg, console and
_/run/initramfs/init.log_
+**rd.memdebug=[0-3]**::
+ print memory usage debug info, set the verbose level from 1 to 3
+ print nothing when set rd.memdebug=0
+
**rd.break**::
drop to a shell at the end
--- dracut.orig/modules.d/99base/dracut-lib.sh
+++ dracut/modules.d/99base/dracut-lib.sh
@@ -998,3 +998,93 @@ listlist() {
are_lists_eq() {
listlist "$1" "$2" "$3" "$4" && listlist "$1" "$3" "$2" "$4"
}
+
+setmemdebug() {
+ if [ -z "$DEBUG_MEM_LEVEL" ]; then
+ export DEBUG_MEM_LEVEL=$(getargnum 0 0 3 rd.memdebug)
+ fi
+}
+
+setmemdebug
+
+# parameters: msg [trace_level:trace]...
+function make_trace_mem()
+{
+ msg=$1
+ shift
+ if [ "$DEBUG_MEM_LEVEL" -gt 0 ]; then
+ make_trace show_memstats $DEBUG_MEM_LEVEL "[debug_mem]" "$msg" "$@"
+ fi
+}
+
+# parameters: func log_level prefix msg [trace_level:trace]...
+function make_trace()
+{
+ func=$1
+ shift
+
+ log_level=`echo "$1" | grep -o '^[0-9]\+'`
+ shift
+
+ prefix=$1
+ shift
+
+ msg=$1
+ shift
+
+ if [ -z "$log_level" ]; then
+ return
+ fi
+
+ msg=`echo "$msg" | sed 's/^\s\+//'`
+
+ msg_printed=0
+ while [ $# -gt 0 ]; do
+ trace_level=`echo "$1" | grep -o '^[0-9]\+'`
+ trace_in_higher_levels=`echo "$1" | grep -o '+'`
+ trace=`echo $1 | sed "s/^.*://"`
+
+ if [ -z "$trace_level" ]; then
+ trace_level=0
+ fi
+
+ insert_trace=0
+ if [ -n "$trace_in_higher_levels" ]; then
+ if [ "$log_level" -ge "$trace_level" ]; then
+ insert_trace=1
+ fi
+ else
+ if [ "$log_level" -eq "$trace_level" ]; then
+ insert_trace=1
+ fi
+ fi
+
+ if [ $insert_trace -eq 1 ]; then
+ if [ $msg_printed -eq 0 ]; then
+ echo "$prefix $msg"
+ msg_printed=1
+ fi
+ $func $trace
+ fi
+ shift
+ done
+}
+
+# parameters: type
+show_memstats()
+{
+ case $1 in
+ shortmem)
+ cat /proc/meminfo | grep -e "^MemFree" -e "^Cached" -e "^Slab"
+ ;;
+ mem)
+ cat /proc/meminfo
+ ;;
+ slab)
+ cat /proc/slabinfo
+ ;;
+ iomem)
+ cat /proc/iomem
+ ;;
+ esac
+}
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