On Tue, 28 May 2013 10:25:09 +0530, jack rule said:

I have to implement a dump utility which can dump the physical memory just before the crash/(crash +reboot). if anybody have worked with it pls share any info/structure as i din't find anything yet on google.

Why spend time re-inventing the wheel? Most distros already support a "crash kernel" for specifically this purpose. (It basically uses kexec to boot into the alternate kernel, which does the dump and then re-reboots into whatever your standard kernel is. This is in general a lot safer than trying to trust your crashing kernel to do a dump cleanly.