Query on /proc/vmcore

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I am using kexec/kdump in my system for any crash. As we know, when the system crashes, the capture kernel copies the /proc/vmcore file into a predefined dump location (/var/log/dump) in the file system. 
I gone through the source code fs/proc/vmcore.c. Is this the file which creates the /proc/vmcore after a system crash because /proc/vmcore should be the image of whole physical memory and ELF fomatted? If not, can anybody let me know the source file name?
I think the pages in the vmcore should be in the following order.
1. Dump putbuf (header)
2. Kernel pages
3. Buffer cache pages
4. User pages
5. Free pages
Am I correct?
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