> > I fixed line up problem in v3 patch, please check v3 patch in my another mail.
> > The major problem here is ADDR-SPACE and PAGE-COUNT width is greater than long size on 32 bit kernel.
>
> OK, thanks. But as far as the output display goes, I don't particularly
> like the naming of the "PAGE-CNT" column header. I'd prefer that it be
> changed to reflect the "address_space.nrpages" member that it comes from.
> I also think that the page count should be right-justified. So with this
> additional patch:
>
> --- filesys.c_oliver 2015-06-25 15:30:44.549942532 -0400
> +++ filesys.c 2015-06-25 15:28:17.157947564 -0400
> @@ -2370,13 +2370,12 @@
> fill_task_struct(task);
>
> if (flags & PRINT_PAGES) {
> - sprintf(files_header, " FD%s%s%s%s%s%s%sTYPE%sPATH\n",
> + sprintf(files_header, " FD%s%s%s%s%sNRPAGES%sTYPE%sPATH\n",
> space(MINSPACE),
> mkstring(buf1, VADDR_PRLEN, CENTER|LJUST, "INODE"),
> space(MINSPACE),
> mkstring(buf2, VADDR_PRLEN, CENTER|LJUST, "MAPPING"),
> space(MINSPACE),
> - mkstring(buf3, LONG_PRLEN, CENTER|LJUST, "PAGE-CNT"),
> space(MINSPACE),
> space(MINSPACE));
> } else {
> @@ -2935,8 +2934,8 @@
> CENTER|RJUST|LONG_HEX,
> MKSTR(i_mapping)),
> space(MINSPACE),
> - mkstring(buf3, LONG_PRLEN,
> - CENTER|RJUST|LONG_DEC,
> + mkstring(buf3, strlen("NRPAGES"),
> + RJUST|LONG_DEC,
> MKSTR(count)),
> space(MINSPACE),
> type,

Merge above patch in my v4 patch.

Thanks a lot!

>
>
> >> And secondly, taking the address_space e6c6a754 from the task above,
> >> again, shouldn't the page count above be reflected in the number of
> >> shown by the address_space tree dump, where the page dump seems to
> >> be missing about 20000 pages?:
> >>
> >> crash> files -m e6c6a754 | wc -l
> >> 128825
> >> crash>
> >
> > I can't reproduce this issue on my 32bit kernel.
> >
> > Could you verify whether you can get the same number of pages by tree command?
> >
> > First step, get the page_tree address,
> >
> > address_space.page_tree e6c6a754
> >
> > Second step, using tree command dump pages,
> >
> > tree -t radix -N <page_tree address>
>
> As it turns out, that dumpfile was created with the "snap.so" extension module,
> which creates a vmcore while running on a live system. And since the kernel
> is running while the dumpfile is being created, you may see any number of
> odd outputs. Running the "tree" command above fails with a duplicate list entry
> failure, so the "files -a" command should also fail prematurely. So it's not a
> problem.

Thanks for confirmation. Yes, live memory dump can be this kind of problem.


> >>
> >> For that matter, displaying the address_space address is redundant
> >> since (1) it has to be entered as the command argument, and (2) it gets
> >> shown in every page line "MAPPING". On the other hand, perhaps the inode
> >> that contains the address_space structure would be helpful, say, like
> >> this:
> >
> > In my v3 patch, I files -a accept inode as parameter, instead of address space address.
>
> OK, although I suggested "-a" because it was taking an "address_space" address
> as an argument. So perhaps it should be "-i <inode-address>"?

I prefer -p option, as it indicates the memory mapping view for the output.

> > We decoupled two commands here.
>
> The first line of the page dump is kind of unusual:
>
> crash> files -a ffff8801085680b0
> Address space ffff8801085681f0, 35002 pages
>
> PAGE PHYSICAL MAPPING INDEX CNT FLAGS
> ffffea00072ca3c0 1cb28f000 ffff8801085681f0 0 1 5ff0000002006c referenced,uptodate,lru,active,mappedtodisk
> ffffea0000c1f340 307cd000 ffff8801085681f0 200 1 3ff0000002006c referenced,uptodate,lru,active,mappedtodisk
> ffffea00030dea40 c37a9000 ffff8801085681f0 201 1 3ff0000002006c referenced,uptodate,lru,active,mappedtodisk
> ...
>
> Can you make it show INODE, ADDRESS_SPACE, and NRPAGES values (in that order),
> similar to how I suggested before?
>
>
> > But how about using -p instead of -a for page dump?
>
> Yes, sure -- either -i or -p makes sense.

I will use -p in v4 patch as I mentioned above.

> OK, you've convinced me... ;-)
>
> So, aside from the patch I added above, the addition of the INODE, ADDRESS_SPACE
> and NRPAGES display to the top of the "files -i|p" command, and the help page additions,
> this is looking pretty good.

Sure. Please see my v4 patch.