Re: [PATCH v10 3/3] mm: add anonymous vma name refcounting

[Michal Hocko]

On Thu 07-10-21 09:04:09, Suren Baghdasaryan wrote:
> On Thu, Oct 7, 2021 at 3:15 AM Pavel Machek <pavel@xxxxxx> wrote:
> >
> > Hi!
> >
> > > >> Hmm, so the suggestion is to have some directory which contains files
> > > >> representing IDs, each containing the string name of the associated
> > > >> vma? Then let's say we are creating a new VMA and want to name it. We
> > > >> would have to scan that directory, check all files and see if any of
> > > >> them contain the name we want to reuse the same ID.
> > > >
> > > > I believe Pavel meant something as simple as
> > > > $ YOUR_FILE=$YOUR_IDS_DIR/my_string_name
> > > > $ touch $YOUR_FILE
> > > > $ stat -c %i $YOUR_FILE
> 
> Ah, ok, now I understand the proposal. Thanks for the clarification!
> So, this would use filesystem as a directory for inode->name mappings.
> One rough edge for me is that the consumer would still need to parse
> /proc/$pid/maps and convert [anon:inode] into [anon:name] instead of
> just dumping the content for the user. Would it be acceptable if we
> require the ID provided by prctl() to always be a valid inode and
> show_map_vma() would do the inode-to-filename conversion when
> generating maps/smaps files? I know that inode->dentry is not
> one-to-one mapping but we can simply output the first dentry name.
> WDYT?

No. You do not want to dictate any particular way of the mapping. The
above is just one way to do that without developing any actual mapping
yourself. You just use a filesystem for that. Kernel doesn't and
shouldn't understand the meaning of those numbers. It has no business in
that.

In a way this would be pushing policy into the kernel.

-- 
Michal Hocko
SUSE Labs