kexec August 2015

kexec@lists.fedoraproject.org

6 participants
11 discussions

[PATCH RFC] module-setup.sh: install usb serial driver for ttyUSB0
by Dave Young 27 May '16

27 May '16

In case one want to use usb serial console, we need to pack the usb serial driver into kdump initramfs so that one can see the console output on the usb console. I only handled ttyUSB0, this is like a hard code, but it should be enough for most cases. Also only install the driver for the ttyUSB0 device. Tested with adding "console=ttyUSB0" in 2nd kernel commandline. Tested latest F22 kernel, there's CONFIG_USB_SERIAL_CONSOLE=y, kdump work ok. Signed-off-by: Dave Young <dyoung(a)redhat.com> --- dracut-module-setup.sh | 8 ++++++++ 1 file changed, 8 insertions(+) --- kexec-tools.orig/dracut-module-setup.sh +++ kexec-tools/dracut-module-setup.sh @@ -626,4 +626,12 @@ installkernel() { [ "$wdt" = "iTCO_wdt" ] && instmods lpc_ich instmods $wdt fi + + if [ -c /dev/ttyUSB0 ]; then + _majmin=$(get_maj_min /dev/ttyUSB0) + + _driver=$(readlink /sys/dev/char/$_majmin/device/driver) + _driver=$(basename $_driver) + instmods $_driver + fi }

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[PATCH v2] Add checking num-threads of makedumpfile
by Zhou Wenjian 08 Sep '15

08 Sep '15

A new feature that doing compressing and writing by multi-threads has been added in makedumpfile. The thread num is specified by "--num-threads NUM". According to its implementation, there will be performance degradation if the threads are more than cpus. So we should check it. Signed-off-by: Zhou wenjian <zhouwj-fnst(a)cn.fujitsu.com> --- kdumpctl | 15 +++++++++++++++ 1 files changed, 15 insertions(+), 0 deletions(-) diff --git a/kdumpctl b/kdumpctl index b504734..fd2abe4 100755 --- a/kdumpctl +++ b/kdumpctl @@ -259,6 +259,21 @@ check_config() esac done < $KDUMP_CONFIG_FILE + grep "^core_collector.*makedumpfile" $KDUMP_CONFIG_FILE | grep -q "num-threads" + if [ $? -eq 0 ];then + local nr_cpus=1 + local num_threads=0 + local core_collector=`grep "^core_collector" $KDUMP_CONFIG_FILE` + + num_threads=`echo ${core_collector#*--num-threads} | awk '{print $1}'` + nr_cpus=`echo ${KDUMP_COMMANDLINE_APPEND#*nr_cpus=} | awk '{print $1}'` + + if [ $num_threads -ge $nr_cpus ];then + echo "The num_threads:$num_threads(specified in /etc/kdump.conf) should be less than nr_cpus:$nr_cpus(specified in /etc/sysconfig/kdump)" + echo "or makedumpfile may have bad performance!" + fi + fi + check_fence_kdump_config || return 1 return 0 -- 1.7.1

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[PATCH] Add checking num-threads of makedumpfile
by Zhou Wenjian 25 Aug '15

25 Aug '15

A new feature that doing compressing and writing by multi-threads has been added in makedumpfile. The thread num is specified by "--num-threads NUM". According to its implementation, there will be performance degradation if the threads are more than cpus. So we should check it. Signed-off-by: Zhou wenjian <zhouwj-fnst(a)cn.fujitsu.com> --- kdumpctl | 16 ++++++++++++++++ 1 files changed, 16 insertions(+), 0 deletions(-) diff --git a/kdumpctl b/kdumpctl index b504734..a4b4681 100755 --- a/kdumpctl +++ b/kdumpctl @@ -259,6 +259,22 @@ check_config() esac done < $KDUMP_CONFIG_FILE + grep -v "^#" $KDUMP_CONFIG_FILE | grep -q "num-threads" + if [ $? -eq 0 ];then + local nr_cpus=1 + local num_threads=0 + local core_collector=`grep -v "^#" $KDUMP_CONFIG_FILE | grep "^core_collector"` + + num_threads=`echo ${core_collector#*--num-threads} | awk '{print $1}'` + nr_cpus=`echo ${KDUMP_COMMANDLINE_APPEND#*nr_cpus=} | awk '{print $1}'` + + test $num_threads -ge $nr_cpus &> /dev/null + if [ $? -eq 0 ];then + echo "The num_threads:$num_threads(specified in /etc/kdump.conf) should be less than nr_cpus:$nr_cpus(specified in /etc/sysconfig/kdump)" + echo "or makedumpfile may have bad performance!" + fi + fi + check_fence_kdump_config || return 1 return 0 -- 1.7.1

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[PATCH] kdumpctl: Remove slub_debug from cmdline
by Dangyi Liu 23 Aug '15

23 Aug '15

slub_debug parameter enables debug for slub, making each object take more memory than normal. During a typical kdump, "slub_debug=FZPU" will cost about 33MB additional memory. If users really want to enable this parameter, they should specify it in KDUMP_COMMANDLINE_APPEND. Signed-off-by: Dangyi Liu <dliu(a)redhat.com> --- kdumpctl | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kdumpctl b/kdumpctl index eaf7f67..9f7e56b 100755 --- a/kdumpctl +++ b/kdumpctl @@ -105,7 +105,7 @@ prepare_cmdline() else cmdline=${KDUMP_COMMANDLINE} fi - cmdline=`remove_cmdline_param "$cmdline" crashkernel hugepages hugepagesz panic_on_warn` + cmdline=`remove_cmdline_param "$cmdline" crashkernel hugepages hugepagesz panic_on_warn slub_debug` cmdline="${cmdline} ${KDUMP_COMMANDLINE_APPEND}" -- 2.4.3

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[PATCH v3] kdumpctl: Add man page for kdumpctl
by Dangyi Liu 18 Aug '15

18 Aug '15

kdumpctl is useful sometimes when users want to debug or setup ssh key authentication. So add a man page for it. Signed-off-by: Dangyi Liu <dliu(a)redhat.com> --- v2->v3: Trivial grammar fix v1->v2: Suggestion to use systemctl instead of kdumpctl Add mkdumprd to "SEE ALSO" kdumpctl.8 | 41 +++++++++++++++++++++++++++++++++++++++++ kexec-tools.spec | 2 ++ 2 files changed, 43 insertions(+) create mode 100644 kdumpctl.8 diff --git a/kdumpctl.8 b/kdumpctl.8 new file mode 100644 index 0000000..b446b81 --- /dev/null +++ b/kdumpctl.8 @@ -0,0 +1,41 @@ +.TH KDUMPCTL 8 2015-07-13 kexec-tools + +.SH NAME +kdumpctl \- control interface for kdump + +.SH SYNOPSIS +.B kdumpctl +.I COMMAND + +.SH DESCRIPTION +.B kdumpctl +is used to check or control the kdump service. +In most cases, you should use +.B systemctl +to start / stop / enable kdump service instead. However, +.B kdumpctl +provides more details for debug and a helper to setup ssh key authentication. + +.SH COMMANDS +.TP +.I start +Start the service. +.TP +.I stop +Stop the service. +.TP +.I status +Prints the current status of kdump service. +It returns non-zero value if kdump is not operational. +.TP +.I restart +Is equal to +.I start; stop +.TP +.I propagate +Helps to setup key authentication for ssh storage since it's +impossible to use password authentication during kdump. + +.SH "SEE ALSO" +.BR kdump.conf (5), +.BR mkdumprd (8) diff --git a/kexec-tools.spec b/kexec-tools.spec index a2e39f8..5b99c83 100644 --- a/kexec-tools.spec +++ b/kexec-tools.spec @@ -27,6 +27,7 @@ Source22: kdump-dep-generator.sh Source23: kdump-anaconda-addon-005-12-g60fa4c1.tar.gz Source24: kdump-lib-initramfs.sh Source25: kdump.sysconfig.ppc64le +Source26: kdumpctl.8 ####################################### # These are sources for mkdumpramfs @@ -159,6 +160,7 @@ install -m 755 %{SOURCE7} $RPM_BUILD_ROOT/sbin/mkdumprd install -m 644 %{SOURCE8} $RPM_BUILD_ROOT%{_sysconfdir}/kdump.conf install -m 644 kexec/kexec.8 $RPM_BUILD_ROOT%{_mandir}/man8/kexec.8 install -m 644 %{SOURCE12} $RPM_BUILD_ROOT%{_mandir}/man8/mkdumprd.8 +install -m 644 %{SOURCE26} $RPM_BUILD_ROOT%{_mandir}/man8/kdumpctl.8 install -m 755 %{SOURCE20} $RPM_BUILD_ROOT%{_prefix}/lib/kdump/kdump-lib.sh install -m 755 %{SOURCE24} $RPM_BUILD_ROOT%{_prefix}/lib/kdump/kdump-lib-initramfs.sh %ifnarch s390x -- 2.4.3

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[PATCH v2] kdumpctl: Add man page for kdumpctl
by Dangyi Liu 17 Aug '15

17 Aug '15

v2: Suggestion to use systemctl instead of kdumpctl Add mkdumprd to "SEE ALSO" v1: Create man page Dangyi Liu (1): kdumpctl: Add man page for kdumpctl kdumpctl.8 | 41 +++++++++++++++++++++++++++++++++++++++++ kexec-tools.spec | 2 ++ 2 files changed, 43 insertions(+) create mode 100644 kdumpctl.8 -- 2.4.3

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[PATCH v2] mkdumprd: Remove ifcfg from dracut's modules
by Dangyi Liu 13 Aug '15

13 Aug '15

Ifcfg depends on network module, which is quite large and useless when using a local dump target. Also we don't really need ifcfg to setup network interfaces. So just remove it. On fedora22, the uncompressed dumprd would decrease about 20MB when using a local dump target. A regression testing is also conducted with targets of nfs and ssh. Signed-off-by: Dangyi Liu <dliu(a)redhat.com> --- mkdumprd | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mkdumprd b/mkdumprd index 28ecdd7..6e3d975 100644 --- a/mkdumprd +++ b/mkdumprd @@ -17,7 +17,7 @@ SAVE_PATH=$(grep ^path $conf_file| cut -d' ' -f2) SAVE_PATH=$(echo $SAVE_PATH | tr -s /) extra_modules="" -dracut_args=("--hostonly" "-o" "plymouth dash resume") +dracut_args=("--hostonly" "-o" "plymouth dash resume ifcfg") OVERRIDE_RESETTABLE=0 perror_exit() { -- 2.4.3

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[PATCH] module-setup: Choose the first matched gateway in kdump_static_ip
by Minfei Huang 13 Aug '15

13 Aug '15

The system may have multiple default route entry. Following is an example to show the details. # ip -6 route list dev eth0 2620:52:0:1040::/64 proto kernel metric 256 expires 2591978sec fe80::/64 proto kernel metric 256 default via fe80:52:0:1040::1 proto ra metric 1024 expires 1778sec hoplimit 64 default via fe80:52:0:1040::2 proto ra metric 1024 expires 1778sec hoplimit 64 Choose the first matched entry. Signed-off-by: Minfei Huang <mhuang(a)redhat.com> --- dracut-module-setup.sh | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh index c37f7c0..a615124 100755 --- a/dracut-module-setup.sh +++ b/dracut-module-setup.sh @@ -99,7 +99,8 @@ kdump_static_ip() { fi if [ -n "$_ipaddr" ]; then - _gateway=$(ip $_ipv6_flag route list dev $_netdev | awk '/^default /{print $3}') + _gateway=$(ip $_ipv6_flag route list dev $_netdev | \ + awk '/^default /{print $3}' | head -n 1) if [ "x" != "x"$_ipv6_flag ]; then # _ipaddr="2002::56ff:feb6:56d5/64", _netmask is the number after "/" -- 2.1.0

2 1

[PATCH] mkdumprd: Remove ifcfg from dracut's modules
by Dangyi Liu 08 Aug '15

08 Aug '15

Ifcfg depends on network module, which is quite large (20M) and useless when using a local kdump target. Also we don't really need ifcfg to setup network interfaces. So just remove it. Signed-off-by: Dangyi Liu <dliu(a)redhat.com> --- mkdumprd | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mkdumprd b/mkdumprd index 28ecdd7..6e3d975 100644 --- a/mkdumprd +++ b/mkdumprd @@ -17,7 +17,7 @@ SAVE_PATH=$(grep ^path $conf_file| cut -d' ' -f2) SAVE_PATH=$(echo $SAVE_PATH | tr -s /) extra_modules="" -dracut_args=("--hostonly" "-o" "plymouth dash resume") +dracut_args=("--hostonly" "-o" "plymouth dash resume ifcfg") OVERRIDE_RESETTABLE=0 perror_exit() { -- 2.4.3

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[PATCH] module-setup: Add permanent option to detect static ip address or not
by Minfei Huang 06 Aug '15

06 Aug '15

Dracut will die in the situation that dracut detects to use dhcp to setup ip address, but kdump passes the ip address to it. In commit 7ea50dc7a38d14009b9be36f6d6ca59a89a430be, we start to use option permanent to get the ip address in kdump_static_ip. If the network is setuped by static, we will get the ip address, otherwise getting none. In commit c994a80698b6b12e50791b36fe40ae36485098d0 which it used to support ipv6 protocol, I miss the option permanent. This patch is not a fixing patch, just pulls back something to make kdump work as original. Signed-off-by: Minfei Huang <mhuang(a)redhat.com> --- dracut-module-setup.sh | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh index c37f7c0..dbe9b10 100755 --- a/dracut-module-setup.sh +++ b/dracut-module-setup.sh @@ -92,7 +92,7 @@ kdump_static_ip() { local _netdev="$1" _srcaddr="$2" _ipv6_flag local _netmask _gateway _ipaddr _target _nexthop - _ipaddr=$(ip addr show dev $_netdev | awk "/ $_srcaddr\/.* /{print \$2}") + _ipaddr=$(ip addr show dev $_netdev permanent | awk "/ $_srcaddr\/.* /{print \$2}") if is_ipv6_address $_srcaddr; then _ipv6_flag="-6" -- 2.1.0

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kexec August 2015