-----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. > > > > Thank you, Kazu. > > As you mentioned, makedumpfile in 'devel' branch can print VMCOREINFO in /proc/kcore, > can i add the following command to this document? > > #makedumpfile --mem-usage /proc/kcore -D I don't know whether we can add unreleased softwares to the document. Any comments on this? If it's OK, crash also can dump it, so --- To dump the VMCOREINFO contents, one can do: # crash vmlinux /proc/kcore ... > help -n or # makedumpfile -D --mem-usage /proc/kcore --- or remove that for now and update later? > > >> +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. > > > > Great. I will modify it in next post. > > And also merge the 'PG_buddy' and 'PG_offline' into the PG_* flag here. Thanks, I think your "PAGE_OFFLINE_MAPCOUNT_VALUE(~PG_offline)" style is good. Kazu > > Many thanks. > > Lianbo > > >> +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 > > > >
