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SubjectRe: [PATCH] Documentation/mm/page_owner.rst: update experimental data
On Thu, Aug 25, 2022 at 12:09:35PM -0600, Jonathan Corbet wrote:
> > - Without page owner::
> >
> > text data bss dec hex filename
> > - 48392 2333 644 51369 c8a9 mm/page_alloc.o
> > + 58581 3166 652 62399 f3bf mm/page_alloc.o
> >
> > - With page owner::
> >
> > text data bss dec hex filename
> > - 48800 2445 644 51889 cab1 mm/page_alloc.o
> > - 6662 108 29 6799 1a8f mm/page_owner.o
> > - 1025 8 8 1041 411 mm/page_ext.o
> > + 59085 3294 652 63031 f637 mm/page_alloc.o
> > + 7464 125 28 7617 1dc1 mm/page_owner.o
> > + 1396 32 8 1436 59c mm/page_ext.o
> >
> > -Although, roughly, 8 KB code is added in total, page_alloc.o increase by
> > -520 bytes and less than half of it is in hotpath. Building the kernel with
> > +Although, roughly, 9 KB code is added in total, page_alloc.o increase by
> > +632 bytes and less than half of it is in hotpath. Building the kernel with
> > page owner and turning it on if needed would be great option to debug
> > kernel memory problem.
>
> This seems like a fine patch...but I do have to wonder if it really
> makes sense to maintain this information, which will surely be subject
> to frequent change. Perhaps the whole thing is better replaced with a
> line saying that enabling page owner adds ~9KB?
>

The size figure above is from size(1) from binutils, for which the
command is run (maybe) against vmlinux.

So I would like to say "Enabling page owner increases vmlinux size by
several kilobytes."

Thanks.

--
An old man doll... just what I always wanted! - Clara
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