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* [PATCH 0/4] introduce memory hinting API for external process
@ 2020-01-10 21:34 Minchan Kim
  2020-01-10 21:34 ` [PATCH 1/4] mm: factor out madvise's core functionality Minchan Kim
                   ` (3 more replies)
  0 siblings, 4 replies; 26+ messages in thread
From: Minchan Kim @ 2020-01-10 21:34 UTC (permalink / raw)
  To: Andrew Morton
  Cc: LKML, linux-mm, linux-api, oleksandr, Suren Baghdasaryan,
	Tim Murray, Daniel Colascione, Sandeep Patil, Sonny Rao,
	Brian Geffon, Michal Hocko, Johannes Weiner, Shakeel Butt,
	John Dias, Minchan Kim

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



^ permalink raw reply	[flat|nested] 26+ messages in thread

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Thread overview: 26+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-01-10 21:34 [PATCH 0/4] introduce memory hinting API for external process Minchan Kim
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

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