On Tue, Jun 04, 2013 at 01:50:19PM +0530, Mahesh Jagannath Salgaonkar wrote: > On 05/30/2013 07:53 PM, Vivek Goyal wrote: > > On Thu, May 30, 2013 at 08:49:07AM +0200, Harald Hoyer wrote: > > > > [..] > >>> Sorry for restarting this discussion very late. I would like to know how > >>> safe is to rebuild kernel's default (boot) initramfs for an already > >>> installed kernel ? > >>> > >>> Also, Does dracut provides any of following mechanism? > >>> a) Mechanism where dracut can detect what options were used during first > >>> build for a given (exsisting) initramfs. (This mechanism may help one to > >>> regenerate similar initramfs with additional dracut modules.) > >> > >> currently dracut only stores which modules were used to generate the image in > >> usr/lib/dracut/modules.txt > >> > >> But yes, you are right. Would be nice to save all the options and have a > >> mechanism to regenerate it with those. > >> > > > > I am not sure how well it will work in the context of kdump. kdump > > options and original options might conflict. kdump might drop some of > > its own cmdline options in initramfs which might not make any sense > > in regular boot. > > > > Kdump will specify additional mount points. IIUC, then we will try > > to bring up those targets in regular boot too and mount at user > > specified mount point. And later init services might get confused > > when respective daemon tries to bring up same targets again. > > I think we should be able differentiate between regular boot and boot > after crash by checking existence of '/proc/vmcore' file, and do the > kdump specific configs/mount if this file exists. In regular boot we can > mute the kdump code path. Also what about kernel command line? Kernel command line can be very specific to kdump environment. It is atleast in x86. I am hoping that's not the case with firmware assisted dump. Also can you point me to some writeup of fadump again. I want to refresh what fadump is doing and how firmware is assisting and how does it make better than regular kdump. I suspect it is very similar to s390 firmware dump (zfcpdump). Does s390 kdump or s390 zfcpdump reboot after saving dump or they have mechanism to continue to boot and hotplug memory after saving dump. I am wondering how do they do it. CCing michael. Vivek -- 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
