Hi Lianbo,

-----Original Message-----

+=======================
+What is the VMCOREINFO?
+=======================
+
+VMCOREINFO is a special ELF note section. It contains various
+information from the kernel like structure size, page size, symbol
+values, field offsets, etc. These data are packed into an ELF note
+section and used by user-space tools like crash and makedumpfile to
+analyze a kernel's memory layout.
+
+To dump the VMCOREINFO contents, one can do:
+
+# makedumpfile -g VMCOREINFO -x vmlinux

again, this command does not dump the VMCOREINFO in ELF note section.
It converts the vmlinux's debug infomation into a VMCOREINFO-like data.
So I don't think this command is suitable to introduce here.

+PG_lru|PG_private|PG_swapcache|PG_swapbacked|PG_slab|
+PG_hwpoision|PG_head_mask
+-----------------------------------------------------
+
+Page attributes. These flags are used to filter free pages.

Some of these are not used to filter *free* pages, so

... used to filter various unnecessary pages.

+PAGE_BUDDY_MAPCOUNT_VALUE or ~PG_buddy
+--------------------------------------

then, this can be merged into the one above?

+======
+x86_64
+======

...

+PAGE_OFFLINE_MAPCOUNT_VALUE(~PG_offline)
+----------------------------------------

This looks not only for x86_64, and also can be merged into
the PG_* flags?

Thank you for your effort!
Kazu