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Hugh Dickins ece369c7e1 mm/munlock: add lru_add_drain() to fix memcg_stat_test 
Mike reports that LTP memcg_stat_test usually leads to

  memcg_stat_test 3 TINFO: Test unevictable with MAP_LOCKED
  memcg_stat_test 3 TINFO: Running memcg_process --mmap-lock1 -s 135168
  memcg_stat_test 3 TINFO: Warming up pid: 3460
  memcg_stat_test 3 TINFO: Process is still here after warm up: 3460
  memcg_stat_test 3 TFAIL: unevictable is 122880, 135168 expected

but may also lead to

  memcg_stat_test 4 TINFO: Test unevictable with mlock
  memcg_stat_test 4 TINFO: Running memcg_process --mmap-lock2 -s 135168
  memcg_stat_test 4 TINFO: Warming up pid: 4271
  memcg_stat_test 4 TINFO: Process is still here after warm up: 4271
  memcg_stat_test 4 TFAIL: unevictable is 122880, 135168 expected

or both.  A wee bit flaky.

follow_page_pte() used to have an lru_add_drain() per each page mlocked,
and the test came to rely on accurate stats.  The pagevec to be drained
is different now, but still covered by lru_add_drain(); and, never mind
the test, I believe it's in everyone's interest that a bulk faulting
interface like populate_vma_page_range() or faultin_vma_page_range()
should drain its local pagevecs at the end, to save others sometimes
needing the much more expensive lru_add_drain_all().

This does not absolutely guarantee exact stats - the mlocking task can
be migrated between CPUs as it proceeds - but it's good enough and the
tests pass.

Link: https://lkml.kernel.org/r/47f6d39c-a075-50cb-1cfb-26dd957a48af@google.com
Fixes: b67bf49ce7 ("mm/munlock: delete FOLL_MLOCK and FOLL_POPULATE")
Signed-off-by: Hugh Dickins <hughd@google.com>
Reported-by: Mike Galbraith <efault@gmx.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-04-01 11:46:09 -07:00
arch This pull request contains the following changes for UML: 2022-03-31 16:16:58 -07:00
block ptrace: Cleanups for v5.18 2022-03-28 17:29:53 -07:00
certs Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
crypto for-5.18/64bit-pi-2022-03-25 2022-03-26 12:01:35 -07:00
Documentation This pull request contains the following changes for UML: 2022-03-31 16:16:58 -07:00
drivers This pull request contains fixes for JFFS2, UBI and UBIFS 2022-03-31 16:09:41 -07:00
fs nilfs2: get rid of nilfs_mapping_init() 2022-04-01 11:46:09 -07:00
include Netfs prep for write helpers 2022-03-31 15:49:36 -07:00
init Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
ipc fs: allocate inode by using alloc_inode_sb() 2022-03-22 15:57:03 -07:00
kernel Networking fixes for 5.18-rc1 and rethook patches. 2022-03-31 11:23:31 -07:00
lib This pull request contains the following changes for UML: 2022-03-31 16:16:58 -07:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm/munlock: add lru_add_drain() to fix memcg_stat_test 2022-04-01 11:46:09 -07:00
net Networking fixes for 5.18-rc1 and rethook patches. 2022-03-31 11:23:31 -07:00
samples dma-mapping updates for Linux 5.18 2022-03-29 08:50:14 -07:00
scripts Some late-arriving documentation improvements. This is mostly build-system 2022-03-31 12:10:42 -07:00
security hardening updates for v5.18-rc1-fix1 2022-03-31 11:43:01 -07:00
sound xen: branch for v5.18-rc1 2022-03-28 14:32:39 -07:00
tools virtio: features, fixes 2022-03-31 13:57:15 -07:00
usr Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
virt KVM: compat: riscv: Prevent KVM_COMPAT from being selected 2022-03-11 19:02:15 +05:30
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap Char/Misc and other driver updates for 5.18-rc1 2022-03-28 12:27:35 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +01:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS This pull request contains the following changes for UML: 2022-03-31 16:16:58 -07:00
Makefile Kbuild updates for v5.18 2022-03-31 11:59:03 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.