5:28 a.m.
Kairui Song (2):
Disable device dump by default
kexec-kdump-howto.txt: Add notes about device dump
kdump.sysconfig | 2 +-
kdump.sysconfig.aarch64 | 2 +-
kdump.sysconfig.i386 | 2 +-
kdump.sysconfig.ppc64 | 2 +-
kdump.sysconfig.ppc64le | 2 +-
kdump.sysconfig.s390x | 2 +-
kdump.sysconfig.x86_64 | 2 +-
kexec-kdump-howto.txt | 16 ++++++++++++++++
8 files changed, 23 insertions(+), 7 deletions(-)
--
2.21.0
5:28 a.m.
New subject: [PATCH v2 1/2] Disable device dump by default
Device dump may use a log of memory and cause OOM issue, so append
"novmcoredd" option for second kernel and disable it by default.
To use device dump, user should remove the vmcoredd parameter
manually.
Signed-off-by: Kairui Song <kasong(a)redhat.com>
---
kdump.sysconfig | 2 +-
kdump.sysconfig.aarch64 | 2 +-
kdump.sysconfig.i386 | 2 +-
kdump.sysconfig.ppc64 | 2 +-
kdump.sysconfig.ppc64le | 2 +-
kdump.sysconfig.s390x | 2 +-
kdump.sysconfig.x86_64 | 2 +-
7 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/kdump.sysconfig b/kdump.sysconfig
index ffe1df8..df518d6 100644
--- a/kdump.sysconfig
+++ b/kdump.sysconfig
@@ -21,7 +21,7 @@ KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug
quiet"
# This variable lets us append arguments to the current kdump commandline
# after processed by KDUMP_COMMANDLINE_REMOVE
-KDUMP_COMMANDLINE_APPEND="irqpoll maxcpus=1 reset_devices"
+KDUMP_COMMANDLINE_APPEND="irqpoll maxcpus=1 reset_devices novmcoredd"
# Any additional kexec arguments required. In most situations, this should
# be left empty
diff --git a/kdump.sysconfig.aarch64 b/kdump.sysconfig.aarch64
index c72a040..d5d7624 100644
--- a/kdump.sysconfig.aarch64
+++ b/kdump.sysconfig.aarch64
@@ -21,7 +21,7 @@ KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug
quiet"
# This variable lets us append arguments to the current kdump commandline
# after processed by KDUMP_COMMANDLINE_REMOVE
-KDUMP_COMMANDLINE_APPEND="irqpoll nr_cpus=1 reset_devices cgroup_disable=memory
udev.children-max=2 panic=10 swiotlb=noforce"
+KDUMP_COMMANDLINE_APPEND="irqpoll nr_cpus=1 reset_devices cgroup_disable=memory
udev.children-max=2 panic=10 swiotlb=noforce novmcoredd"
# Any additional kexec arguments required. In most situations, this should
# be left empty
diff --git a/kdump.sysconfig.i386 b/kdump.sysconfig.i386
index b5ec653..c31a8cb 100644
--- a/kdump.sysconfig.i386
+++ b/kdump.sysconfig.i386
@@ -21,7 +21,7 @@ KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug
quiet"
# This variable lets us append arguments to the current kdump commandline
# after processed by KDUMP_COMMANDLINE_REMOVE
-KDUMP_COMMANDLINE_APPEND="irqpoll nr_cpus=1 reset_devices numa=off
udev.children-max=2 panic=10 transparent_hugepage=never"
+KDUMP_COMMANDLINE_APPEND="irqpoll nr_cpus=1 reset_devices numa=off
udev.children-max=2 panic=10 transparent_hugepage=never novmcoredd"
# Any additional kexec arguments required. In most situations, this should
# be left empty
diff --git a/kdump.sysconfig.ppc64 b/kdump.sysconfig.ppc64
index e142c6e..1f95452 100644
--- a/kdump.sysconfig.ppc64
+++ b/kdump.sysconfig.ppc64
@@ -21,7 +21,7 @@ KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug
quiet"
# This variable lets us append arguments to the current kdump commandline
# after processed by KDUMP_COMMANDLINE_REMOVE
-KDUMP_COMMANDLINE_APPEND="irqpoll maxcpus=1 noirqdistrib reset_devices
cgroup_disable=memory numa=off udev.children-max=2 ehea.use_mcs=0 panic=10
kvm_cma_resv_ratio=0 transparent_hugepage=never"
+KDUMP_COMMANDLINE_APPEND="irqpoll maxcpus=1 noirqdistrib reset_devices
cgroup_disable=memory numa=off udev.children-max=2 ehea.use_mcs=0 panic=10
kvm_cma_resv_ratio=0 transparent_hugepage=never novmcoredd"
# Any additional kexec arguments required. In most situations, this should
# be left empty
diff --git a/kdump.sysconfig.ppc64le b/kdump.sysconfig.ppc64le
index e142c6e..1f95452 100644
--- a/kdump.sysconfig.ppc64le
+++ b/kdump.sysconfig.ppc64le
@@ -21,7 +21,7 @@ KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug
quiet"
# This variable lets us append arguments to the current kdump commandline
# after processed by KDUMP_COMMANDLINE_REMOVE
-KDUMP_COMMANDLINE_APPEND="irqpoll maxcpus=1 noirqdistrib reset_devices
cgroup_disable=memory numa=off udev.children-max=2 ehea.use_mcs=0 panic=10
kvm_cma_resv_ratio=0 transparent_hugepage=never"
+KDUMP_COMMANDLINE_APPEND="irqpoll maxcpus=1 noirqdistrib reset_devices
cgroup_disable=memory numa=off udev.children-max=2 ehea.use_mcs=0 panic=10
kvm_cma_resv_ratio=0 transparent_hugepage=never novmcoredd"
# Any additional kexec arguments required. In most situations, this should
# be left empty
diff --git a/kdump.sysconfig.s390x b/kdump.sysconfig.s390x
index 6edc2fa..abd45a2 100644
--- a/kdump.sysconfig.s390x
+++ b/kdump.sysconfig.s390x
@@ -21,7 +21,7 @@ KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug
quiet"
# This variable lets us append arguments to the current kdump commandline
# after processed by KDUMP_COMMANDLINE_REMOVE
-KDUMP_COMMANDLINE_APPEND="nr_cpus=1 cgroup_disable=memory numa=off
udev.children-max=2 panic=10 transparent_hugepage=never"
+KDUMP_COMMANDLINE_APPEND="nr_cpus=1 cgroup_disable=memory numa=off
udev.children-max=2 panic=10 transparent_hugepage=never novmcoredd"
# Any additional /sbin/mkdumprd arguments required.
MKDUMPRD_ARGS=""
diff --git a/kdump.sysconfig.x86_64 b/kdump.sysconfig.x86_64
index 4a5ec1c..0ceed1f 100644
--- a/kdump.sysconfig.x86_64
+++ b/kdump.sysconfig.x86_64
@@ -21,7 +21,7 @@ KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug
quiet"
# This variable lets us append arguments to the current kdump commandline
# after processed by KDUMP_COMMANDLINE_REMOVE
-KDUMP_COMMANDLINE_APPEND="irqpoll nr_cpus=1 reset_devices cgroup_disable=memory
mce=off numa=off udev.children-max=2 panic=10 acpi_no_memhotplug
transparent_hugepage=never nokaslr"
+KDUMP_COMMANDLINE_APPEND="irqpoll nr_cpus=1 reset_devices cgroup_disable=memory
mce=off numa=off udev.children-max=2 panic=10 acpi_no_memhotplug
transparent_hugepage=never nokaslr novmcoredd"
# Any additional kexec arguments required. In most situations, this should
# be left empty
--
2.21.0
5:28 a.m.
New subject: [PATCH v2 2/2] kexec-kdump-howto.txt: Add notes about device dump
Currently there are two issues with device dump:
- It may use too much memory
- kdump won't automatically include required driver in second kernel
User should manually reserve enough memory, and include the required
driver by using extra_modules. Add some notes about the issues in
kexec-kdump-howto.txt
Signed-off-by: Kairui Song <kasong(a)redhat.com>
---
kexec-kdump-howto.txt | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/kexec-kdump-howto.txt b/kexec-kdump-howto.txt
index 7e9e58a..109b13d 100644
--- a/kexec-kdump-howto.txt
+++ b/kexec-kdump-howto.txt
@@ -698,6 +698,22 @@ crash kernel according, or update your encryption setup.
It's recommanded to use a non-encrypted target (eg. remote target)
instead.
+Notes on device dump:
+
+Device dump allows drivers to append dump data to vmcore, so you can
+collect driver specified debug info. The drivers could append the
+data without any limit, and the data is stored in memory, this may
+bring a significant memory stress. So device dump is disabled by default
+by passing "novmcoredd" command line option to the kdump capture kernel.
+If you want to collect debug data with device dump, you need to modify
+"KDUMP_COMMANDLINE_APPEND=" value in /etc/sysconfig/kdump and remove the
+"novmcoredd" option. You also need to increase the reserved enough memory
+in case of OOM issue.
+Besides, kdump initramfs won't include the kernel modules which supports
+device dump automatically. So to ensure the device dump data you are
+interested is included in the vmcore, you have to force include the module
+by giving the module name in extra_modules list in /etc/kdump.conf
+
Parallel Dumping Operation
==========================
Kexec allows kdump using multiple cpus. So parallel feature can accelerate
--
2.21.0
6:38 a.m.
New subject: [PATCH v2 2/2] kexec-kdump-howto.txt: Add notes about device dump
Hi Kairui,
On 05/29/19 at 06:28pm, Kairui Song wrote:
Currently there are two issues with device dump:
- It may use too much memory
- kdump won't automatically include required driver in second kernel
User should manually reserve enough memory, and include the required
driver by using extra_modules. Add some notes about the issues in
kexec-kdump-howto.txt
Signed-off-by: Kairui Song <kasong(a)redhat.com>
---
kexec-kdump-howto.txt | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/kexec-kdump-howto.txt b/kexec-kdump-howto.txt
index 7e9e58a..109b13d 100644
--- a/kexec-kdump-howto.txt
+++ b/kexec-kdump-howto.txt
@@ -698,6 +698,22 @@ crash kernel according, or update your encryption setup.
It's recommanded to use a non-encrypted target (eg. remote target)
instead.
+Notes on device dump:
+
+Device dump allows drivers to append dump data to vmcore, so you can
+collect driver specified debug info. The drivers could append the
+data without any limit, and the data is stored in memory, this may
+bring a significant memory stress. So device dump is disabled by default
+by passing "novmcoredd" command line option to the kdump capture kernel.
+If you want to collect debug data with device dump, you need to modify
+"KDUMP_COMMANDLINE_APPEND=" value in /etc/sysconfig/kdump and remove the
+"novmcoredd" option. You also need to increase the reserved enough memory
+in case of OOM issue.
+Besides, kdump initramfs won't include the kernel modules which supports
+device dump automatically. So to ensure the device dump data you are
Better to add more words eg. below:
kdump initramfs only includes device drivers which are required by the
dump target setups, you can force include the device drivers for device
dump by using extra_modules option in /etc/kdump.conf
+interested is included in the vmcore, you have to force include the
module
+by giving the module name in extra_modules list in /etc/kdump.conf
+
Parallel Dumping Operation
==========================
Kexec allows kdump using multiple cpus. So parallel feature can accelerate
--
2.21.0
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Thanks
Dave
1788
days inactive
1788
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3 comments
2 participants
participants (2)
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Dave Young -
Kairui Song