From: Oleksandr Natalenko <oleksandr@redhat.com>
To: Minchan Kim <minchan@kernel.org>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>,
Michal Hocko <mhocko@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
linux-api@vger.kernel.org, Suren Baghdasaryan <surenb@google.com>,
Tim Murray <timmurray@google.com>,
Daniel Colascione <dancol@google.com>,
Sandeep Patil <sspatil@google.com>,
Sonny Rao <sonnyrao@google.com>,
Brian Geffon <bgeffon@google.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Shakeel Butt <shakeelb@google.com>,
John Dias <joaodias@google.com>,
ktkhai@virtuozzo.com, christian.brauner@ubuntu.com,
sjpark@amazon.de
Subject: Re: [PATCH v2 2/5] mm: introduce external memory hinting API
Date: Thu, 23 Jan 2020 08:29:04 +0100 [thread overview]
Message-ID: <20200123072904.ludphxkxseyg2qli@butterfly.localdomain> (raw)
In-Reply-To: <20200123014316.GB249784@google.com>
On Wed, Jan 22, 2020 at 05:43:16PM -0800, Minchan Kim wrote:
> > It seems I've overlooked an important piece of this submission: one
> > cannot apply the hint to all the anonymous mapping regardless of address
> > range. For KSM I'd rather either have a possibility to hint all the
> > anonymous mappings, or, as it was suggested previously, be able to iterate
> > over existing mappings using some (fd-based?) API.
>
> Thing is how you could identify a certan range is better for KSM than
> others from external process?
I think the info like this is kinda available via /proc/pid/smaps. It
lists the ranges and the vmflags. But using it raises 2 concerns: one is
the absence of guarantee the mappings won't change after smaps is read
and the second one is that there's no separate vmflag for marking a vma
as non-meregable (and IIRC from previous attempts on addressing this,
we've already exhausted all the flags on 32-bit arches, so it is not
something that can be trivially addressed).
--
Best regards,
Oleksandr Natalenko (post-factum)
Senior Software Maintenance Engineer
next prev parent reply other threads:[~2020-01-23 7:29 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-16 23:59 [PATCH v2 0/5] introduce memory hinting API for external process Minchan Kim
2020-01-16 23:59 ` [PATCH v2 1/5] mm: factor out madvise's core functionality Minchan Kim
2020-01-17 10:02 ` Kirill Tkhai
2020-01-17 18:14 ` Minchan Kim
2020-01-16 23:59 ` [PATCH v2 2/5] mm: introduce external memory hinting API Minchan Kim
2020-01-17 11:52 ` Michal Hocko
2020-01-17 15:58 ` Kirill A. Shutemov
2020-01-17 17:32 ` Minchan Kim
2020-01-17 21:26 ` Kirill A. Shutemov
2020-01-18 9:40 ` SeongJae Park
2020-01-19 16:14 ` sspatil
2020-01-20 7:58 ` Michal Hocko
2020-01-20 10:39 ` Kirill Tkhai
2020-01-21 18:32 ` Minchan Kim
2020-01-22 8:28 ` Michal Hocko
2020-01-22 9:36 ` SeongJae Park
2020-01-22 10:02 ` Michal Hocko
2020-01-22 13:28 ` SeongJae Park
2020-01-23 1:41 ` Minchan Kim
2020-01-23 9:13 ` Michal Hocko
2020-01-21 18:11 ` Minchan Kim
2020-01-22 10:44 ` Oleksandr Natalenko
2020-01-23 1:43 ` Minchan Kim
2020-01-23 7:29 ` Oleksandr Natalenko [this message]
2020-01-17 17:25 ` Minchan Kim
2020-01-20 8:03 ` Michal Hocko
2020-01-20 10:24 ` Kirill Tkhai
2020-01-20 11:27 ` Michal Hocko
2020-01-20 12:39 ` Kirill A. Shutemov
2020-01-20 13:24 ` Michal Hocko
2020-01-20 14:21 ` Kirill A. Shutemov
2020-01-20 15:44 ` Michal Hocko
2020-01-21 18:43 ` Minchan Kim
2020-01-16 23:59 ` [PATCH v2 3/5] mm/madvise: employ mmget_still_valid for write lock Minchan Kim
2020-01-16 23:59 ` [PATCH v2 4/5] mm/madvise: allow KSM hints for remote API Minchan Kim
2020-01-17 10:13 ` Kirill Tkhai
2020-01-17 12:34 ` Oleksandr Natalenko
2020-01-21 17:45 ` Minchan Kim
2020-01-16 23:59 ` [PATCH v2 5/5] mm: support both pid and pidfd for process_madvise Minchan Kim
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