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Johannes Weiner c91bdc9358 mm: memcontrol: don't allocate cgroup swap arrays when memcg is disabled 
Patch series "memcg swap fix & cleanups".


This patch (of 4):

Since commit 2d1c498072 ("mm: memcontrol: make swap tracking an integral
part of memory control"), the cgroup swap arrays are used to track memory
ownership at the time of swap readahead and swapoff, even if swap space
*accounting* has been turned off by the user via swapaccount=0 (which sets
cgroup_memory_noswap).

However, the patch was overzealous: by simply dropping the
cgroup_memory_noswap conditionals in the swapon, swapoff and uncharge
path, it caused the cgroup arrays being allocated even when the memory
controller as a whole is disabled.  This is a waste of that memory.

Restore mem_cgroup_disabled() checks, implied previously by
cgroup_memory_noswap, in the swapon, swapoff, and swap_entry_free
callbacks.

Link: https://lkml.kernel.org/r/20220926135704.400818-1-hannes@cmpxchg.org
Link: https://lkml.kernel.org/r/20220926135704.400818-2-hannes@cmpxchg.org
Fixes: 2d1c498072 ("mm: memcontrol: make swap tracking an integral part of memory control")
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reported-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Hugh Dickins <hughd@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 		2022-10-03 14:03:36 -07:00
Documentation mm/khugepaged: attempt to map file/shmem-backed pte-mapped THPs by pmds 2022-10-03 14:03:33 -07:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
arch x86: kmsan: handle CPU entry area 2022-10-03 14:03:26 -07:00
block block: kmsan: skip bio block merging logic for KMSAN 2022-10-03 14:03:23 -07:00
certs Kbuild updates for v5.20 2022-08-10 10:40:41 -07:00
crypto crypto: kmsan: disable accelerated configs under KMSAN 2022-10-03 14:03:22 -07:00
drivers crypto: kmsan: disable accelerated configs under KMSAN 2022-10-03 14:03:22 -07:00
fs mm: fs: initialize fsdata passed to write_begin/write_end interface 2022-10-03 14:03:25 -07:00
include mm: remove unused inline functions from include/linux/mm_inline.h 2022-10-03 14:03:35 -07:00
init init: kmsan: call KMSAN initialization routines 2022-10-03 14:03:21 -07:00
io_uring io_uring/net: save address for sendzc async execution 2022-08-25 07:52:30 -06:00
ipc ipc/shm: use VMA iterator instead of linked list 2022-09-26 19:46:21 -07:00
kernel mm/madvise: add file and shmem support to MADV_COLLAPSE 2022-10-03 14:03:33 -07:00
lib kmsan: disable strscpy() optimization under KMSAN 2022-10-03 14:03:22 -07:00
mm mm: memcontrol: don't allocate cgroup swap arrays when memcg is disabled 2022-10-03 14:03:36 -07:00
net Including fixes from ipsec and netfilter (with one broken Fixes tag). 2022-08-25 14:03:58 -07:00
samples Tracing updates for 5.20 / 6.0 2022-08-05 09:41:12 -07:00
scripts kmsan: add KMSAN runtime core 2022-10-03 14:03:19 -07:00
security security: kmsan: fix interoperability with auto-initialization 2022-10-03 14:03:23 -07:00
sound sound fixes for 6.0-rc2 2022-08-19 09:46:11 -07:00
tools selftests/vm: add selftest for MADV_COLLAPSE of uffd-minor memory 2022-10-03 14:03:35 -07:00
usr Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
virt KVM: Drop unnecessary initialization of "ops" in kvm_ioctl_create_device() 2022-08-19 04:05:43 -04:00
.clang-format PCI/DOE: Add DOE mailbox support functions 2022-07-19 15:38:04 -07:00
.cocciconfig
…
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore kbuild: split the second line of *.mod into *.usyms 2022-05-08 03:16:59 +09:00
.mailmap .mailmap: update Luca Ceresoli's e-mail address 2022-08-28 14:02:46 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS drm for 5.20/6.0 2022-08-03 19:52:08 -07:00
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 x86: kmsan: handle CPU entry area 2022-10-03 14:03:26 -07:00
Makefile kmsan: add KMSAN runtime core 2022-10-03 14:03:19 -07:00
README
…

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.