On 12/10/2013 09:21 AM, Baoquan He wrote: > On 08/09/2013 03:20 PM, Harald Hoyer wrote: >> On 08/05/2013 12:19 PM, Baoquan He wrote: >>> Hi Harald, >>> >>> Since some drivers do the soft kicking. That is if BIOS has enabled >>> watchdog, then kernel driver kicks the hardware till user space watchdog >>> daemon comes along. This can help sove the problem in kdump which kdump >>> kernel reboot before vmcore saving is finished. That problem is >>> triggered because watchdog started in 1st kernel and timeout because of >>> stopping being kicked. >>> >>> I noticed in 04watchdog the watchdog.sh will start watchdog if >>> /dev/watchdog exists. I am just wondering if it's needed to start >>> watchdog by accessing /dev/watchdog. If starting watchdog is not needed, >>> I want to make some code change of watchdog.sh. >>> >>> What's your suggestion? >>> >>> Baoquan >>> Thanks a lot >> >> Basically the 04watchdog module was used only in the testsuite. You might >> consider to use the systemd watchdog feature instead. >> >> http://0pointer.de/blog/projects/watchdog.html >> >> or, if 0pointer is down again: >> >> http://webcache.googleusercontent.com/search?q=cache:jYfJU_fFZy8J:0pointer.de/blog/projects/watchdog.html > > Hi, > > I tried your suggestion, systemd can't help. > > In /etc/systemd/system.conf, there are 2 options to control watchdog, > however it need watchdog hardware to be present. That means watchdog > driver need be loaded during startup. > > Baoquan > Thanks Why can't systemd help? dracut also uses the hardware watchdog. There is even a software watchdog device driver (softdog). Just load the module and systemd should start to make use of "/dev/watchdog". With udevd in the initramfs, module loading should happen automatically, you just have to add the watchdog modules to the initramfs. $ echo; echo -n "instmods"; modinfo char-major-10-130 | while read a b; do [[ $a == filename: ]] && (b=${b##*/}; echo -n " ${b%.ko}");done;echo instmods pcwd_pci wdt_pci pcwd_usb alim1535_wdt alim7101_wdt sp5100_tco sbc_fitpc2_wdt ib700wdt ibmasr i6300esb ie6xx_wdt iTCO_wdt it8712f_wdt it87_wdt hpwdt nv_tco sch311x_wdt w83627hf_wdt w83697hf_wdt w83697ug_wdt w83877f_wdt w83977f_wdt machzwd xen_wdt softdog -- To unsubscribe from this list: send the line "unsubscribe initramfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
