Linux-mm Archive on lore.kernel.org
 help / color / Atom feed
From: Minchan Kim <minchan@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	linux-mm <linux-mm@kvack.org>,
	linux-api@vger.kernel.org, oleksandr@redhat.com,
	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>, Michal Hocko <mhocko@suse.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Shakeel Butt <shakeelb@google.com>,
	John Dias <joaodias@google.com>, Minchan Kim <minchan@kernel.org>
Subject: [PATCH 0/4] introduce memory hinting API for external process
Date: Fri, 10 Jan 2020 13:34:29 -0800
Message-ID: <20200110213433.94739-1-minchan@kernel.org> (raw)

Now, we have MADV_PAGEOUT and MADV_COLD as madvise hinting API. With that,
application could give hints to kernel what memory range are preferred to be
reclaimed. However, in some platform(e.g., Android), the information
required to make the hinting decision is not known to the app.
Instead, it is known to a centralized userspace daemon(e.g., ActivityManagerService),
and that daemon must be able to initiate reclaim on its own without any app
involvement.

To solve the concern, this patch introduces new syscall - process_madvise(2).
Bascially, it's same with madvise(2) syscall but it has some differences.

1. It needs pidfd of target process to provide the hint
2. It supports only MADV_{COLD|PAGEOUT|MERGEABLE|UNMEREABLE} at this moment.
   Other hints in madvise will be opened when there are explicit requests from
   community to prevent unexpected bugs we couldn't support.
3. Only privileged processes can do something for other process's address
   space.

Minchan Kim (2):
  mm: factor out madvise's core functionality
  mm: introduce external memory hinting API

Oleksandr Natalenko (2):
  mm/madvise: employ mmget_still_valid for write lock
  mm/madvise: allow KSM hints for remote API

 arch/alpha/kernel/syscalls/syscall.tbl      |   1 +
 arch/arm/tools/syscall.tbl                  |   1 +
 arch/arm64/include/asm/unistd.h             |   2 +-
 arch/arm64/include/asm/unistd32.h           |   2 +
 arch/ia64/kernel/syscalls/syscall.tbl       |   1 +
 arch/m68k/kernel/syscalls/syscall.tbl       |   1 +
 arch/microblaze/kernel/syscalls/syscall.tbl |   1 +
 arch/mips/kernel/syscalls/syscall_n32.tbl   |   1 +
 arch/mips/kernel/syscalls/syscall_n64.tbl   |   1 +
 arch/parisc/kernel/syscalls/syscall.tbl     |   1 +
 arch/powerpc/kernel/syscalls/syscall.tbl    |   1 +
 arch/s390/kernel/syscalls/syscall.tbl       |   1 +
 arch/sh/kernel/syscalls/syscall.tbl         |   1 +
 arch/sparc/kernel/syscalls/syscall.tbl      |   1 +
 arch/x86/entry/syscalls/syscall_32.tbl      |   1 +
 arch/x86/entry/syscalls/syscall_64.tbl      |   1 +
 arch/xtensa/kernel/syscalls/syscall.tbl     |   1 +
 include/linux/syscalls.h                    |   2 +
 include/uapi/asm-generic/unistd.h           |   5 +-
 kernel/sys_ni.c                             |   1 +
 mm/madvise.c                                | 263 ++++++++++++++------
 21 files changed, 205 insertions(+), 85 deletions(-)

-- 
2.25.0.rc1.283.g88dfdc4193-goog



             reply index

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-10 21:34 Minchan Kim [this message]
2020-01-10 21:34 ` [PATCH 1/4] mm: factor out madvise's core functionality Minchan Kim
2020-01-11  7:37   ` SeongJae Park
2020-01-13 18:11     ` Minchan Kim
2020-01-13 18:22       ` SeongJae Park
2020-01-10 21:34 ` [PATCH 2/4] mm: introduce external memory hinting API Minchan Kim
2020-01-11  7:34   ` SeongJae Park
2020-01-13 18:02     ` Minchan Kim
2020-01-13  8:47   ` Kirill Tkhai
2020-01-13 10:42     ` Christian Brauner
2020-01-13 18:44       ` Minchan Kim
2020-01-13 19:10         ` Christian Brauner
2020-01-13 19:27           ` Daniel Colascione
2020-01-13 20:42             ` Christian Brauner
2020-01-13 21:04               ` Daniel Colascione
2020-01-14 19:20                 ` Christian Brauner
2020-01-14 18:59           ` Minchan Kim
2020-01-14 19:22             ` Christian Brauner
2020-01-13 18:39     ` Minchan Kim
2020-01-13 19:18     ` Daniel Colascione
2020-01-14  8:39       ` Kirill Tkhai
2020-01-14 19:12         ` Minchan Kim
2020-01-15  9:38           ` Kirill Tkhai
2020-01-10 21:34 ` [PATCH 3/4] mm/madvise: employ mmget_still_valid for write lock Minchan Kim
2020-01-10 21:34 ` [PATCH 4/4] mm/madvise: allow KSM hints for remote API Minchan Kim
2020-01-11  7:42   ` SeongJae Park

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200110213433.94739-1-minchan@kernel.org \
    --to=minchan@kernel.org \
    --cc=akpm@linux-foundation.org \
    --cc=bgeffon@google.com \
    --cc=dancol@google.com \
    --cc=hannes@cmpxchg.org \
    --cc=joaodias@google.com \
    --cc=linux-api@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=mhocko@suse.com \
    --cc=oleksandr@redhat.com \
    --cc=shakeelb@google.com \
    --cc=sonnyrao@google.com \
    --cc=sspatil@google.com \
    --cc=surenb@google.com \
    --cc=timmurray@google.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-mm Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-mm/0 linux-mm/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-mm linux-mm/ https://lore.kernel.org/linux-mm \
		linux-mm@kvack.org
	public-inbox-index linux-mm

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kvack.linux-mm


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git