From: Michal Hocko <mhocko@suse.com>
To: Suren Baghdasaryan <surenb@google.com>
Cc: "Pavel Machek" <pavel@ucw.cz>,
"Rasmus Villemoes" <linux@rasmusvillemoes.dk>,
"David Hildenbrand" <david@redhat.com>,
"John Hubbard" <jhubbard@nvidia.com>,
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"Dave Hansen" <dave.hansen@intel.com>,
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"Al Viro" <viro@zeniv.linux.org.uk>,
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"Eric W. Biederman" <ebiederm@xmission.com>,
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"Cyrill Gorcunov" <gorcunov@gmail.com>,
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"Viresh Kumar" <viresh.kumar@linaro.org>,
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Subject: Re: [PATCH v10 3/3] mm: add anonymous vma name refcounting
Date: Thu, 7 Oct 2021 18:40:39 +0200 [thread overview]
Message-ID: <YV8jB+kwU95hLqTq@dhcp22.suse.cz> (raw)
In-Reply-To: <CAJuCfpGp0D9p3KhOWhcxMO1wEbo-J_b2Anc-oNwdycx4NTRqoA@mail.gmail.com>
On Thu 07-10-21 09:04:09, Suren Baghdasaryan wrote:
> On Thu, Oct 7, 2021 at 3:15 AM Pavel Machek <pavel@ucw.cz> 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
next prev parent reply other threads:[~2021-10-07 16:40 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-01 20:56 [PATCH v10 1/3] mm: rearrange madvise code to allow for reuse Suren Baghdasaryan
2021-10-01 20:56 ` [PATCH v10 2/3] mm: add a field to store names for private anonymous memory Suren Baghdasaryan
2021-10-01 23:08 ` Andrew Morton
2021-10-02 0:52 ` Suren Baghdasaryan
2021-10-04 16:21 ` Suren Baghdasaryan
2021-10-07 2:39 ` Andrew Morton
2021-10-07 2:50 ` Suren Baghdasaryan
2021-10-01 20:56 ` [PATCH v10 3/3] mm: add anonymous vma name refcounting Suren Baghdasaryan
2021-10-05 18:42 ` Pavel Machek
2021-10-05 19:14 ` Suren Baghdasaryan
2021-10-05 19:21 ` Kees Cook
2021-10-05 20:04 ` Pavel Machek
2021-10-05 20:43 ` Suren Baghdasaryan
2021-10-06 6:57 ` John Hubbard
2021-10-06 8:27 ` Michal Hocko
2021-10-06 9:27 ` David Hildenbrand
2021-10-06 15:01 ` Suren Baghdasaryan
2021-10-06 15:07 ` David Hildenbrand
2021-10-06 15:20 ` Suren Baghdasaryan
2021-10-07 2:29 ` Andrew Morton
2021-10-07 2:46 ` Suren Baghdasaryan
2021-10-07 2:53 ` Andrew Morton
2021-10-07 3:01 ` Suren Baghdasaryan
2021-10-07 7:27 ` David Hildenbrand
2021-10-07 7:33 ` David Hildenbrand
2021-10-07 15:42 ` Suren Baghdasaryan
2021-10-06 17:58 ` Pavel Machek
2021-10-06 18:18 ` Suren Baghdasaryan
2021-10-07 8:10 ` Michal Hocko
2021-10-07 8:41 ` Pavel Machek
2021-10-07 8:47 ` Rasmus Villemoes
2021-10-07 10:15 ` Pavel Machek
2021-10-07 16:04 ` Suren Baghdasaryan
2021-10-07 16:40 ` Michal Hocko [this message]
2021-10-07 16:58 ` Suren Baghdasaryan
2021-10-07 17:31 ` Michal Hocko
2021-10-07 17:50 ` Suren Baghdasaryan
2021-10-07 18:12 ` Kees Cook
2021-10-07 18:50 ` Suren Baghdasaryan
2021-10-07 19:02 ` John Hubbard
2021-10-07 21:32 ` Suren Baghdasaryan
2021-10-08 1:04 ` Liam Howlett
2021-10-08 7:25 ` Rasmus Villemoes
2021-10-08 7:43 ` David Hildenbrand
2021-10-08 21:13 ` Kees Cook
2021-10-08 6:34 ` Michal Hocko
2021-10-08 14:14 ` Dave Hansen
2021-10-08 14:57 ` Michal Hocko
2021-10-08 16:10 ` Suren Baghdasaryan
2021-10-08 20:58 ` Kees Cook
2021-10-11 8:36 ` Michal Hocko
2021-10-12 1:18 ` Suren Baghdasaryan
2021-10-12 1:20 ` Suren Baghdasaryan
2021-10-12 3:00 ` Johannes Weiner
2021-10-12 5:36 ` Suren Baghdasaryan
2021-10-12 18:26 ` Johannes Weiner
2021-10-12 18:52 ` Suren Baghdasaryan
2021-10-12 20:41 ` Johannes Weiner
2021-10-12 20:59 ` Suren Baghdasaryan
2021-10-12 7:36 ` Michal Hocko
2021-10-12 16:50 ` Suren Baghdasaryan
2021-10-12 7:43 ` David Hildenbrand
2021-10-12 17:01 ` Suren Baghdasaryan
2021-10-14 20:16 ` Suren Baghdasaryan
2021-10-15 8:03 ` David Hildenbrand
2021-10-15 16:30 ` Suren Baghdasaryan
2021-10-15 16:39 ` David Hildenbrand
2021-10-15 18:33 ` Suren Baghdasaryan
2021-10-15 17:45 ` Kees Cook
2021-10-07 7:59 ` Michal Hocko
2021-10-07 15:45 ` Suren Baghdasaryan
2021-10-07 16:37 ` Michal Hocko
2021-10-07 16:43 ` Suren Baghdasaryan
2021-10-07 17:25 ` Michal Hocko
2021-10-07 17:30 ` Suren Baghdasaryan
2021-10-04 7:03 ` [PATCH v10 1/3] mm: rearrange madvise code to allow for reuse Rolf Eike Beer
2021-10-04 16:18 ` Suren Baghdasaryan
2021-10-05 21:00 ` Liam Howlett
2021-10-05 21:30 ` Suren Baghdasaryan
2021-10-06 17:33 ` Liam Howlett
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