kexec January 2016

kexec@lists.fedoraproject.org

3 participants
3 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 }

3 4

[PATCH] kexec-kdump-howto: Add the description of parallel dump's limitation.
by Zhou Wenjian 21 Jan '16

21 Jan '16

In the current implementation, parallel dump won't perform well in --num-threads 1 or -d 31. So this patch add the description of it. Signed-off-by: Zhou Wenjian <zhouwj-fnst(a)cn.fujitsu.com> --- kexec-kdump-howto.txt | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kexec-kdump-howto.txt b/kexec-kdump-howto.txt index b4cdc22..00ab96b 100644 --- a/kexec-kdump-howto.txt +++ b/kexec-kdump-howto.txt @@ -627,6 +627,9 @@ For example: 1 has better performance than 2, if THREAD_NUM is larger than two and the usable cpus number is larger than THREAD_NUM. +Limitation: Parallel feature will introduce extra costs to each page(including +filtered page). So it will always have worse performance when the THREAD_NUM +is 1 or -d 31 is specified. Notes on how to use multiple cpus on a capture kernel on x86 system: -- 1.8.3.1

1 0

where can I get the develop branch of fedora kexec?
by 呃呃 20 Jan '16

20 Jan '16

Hi, Could anyone help me? Thanks Wang

2 1

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

kexec January 2016