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Yosry Ahmed cc9bc36ebe mm: zswap: remove nr_zswap_stored atomic 
nr_stored was introduced by commit b5ba474f3f ("zswap: shrink zswap pool
based on memory pressure") as a per zswap_pool counter of the number of
stored pages that are not same-filled pages.  It is used in
zswap_shrinker_count() to scale the number of freeable compressed pages by
the compression ratio.  That is, to reduce the amount of writeback from
zswap with higher compression ratios as the ROI from IO diminishes.

Later on, commit bf9b7df23c ("mm/zswap: global lru and shrinker shared
by all zswap_pools") made the shrinker global (not per zswap_pool), and
replaced nr_stored with nr_zswap_stored (initially introduced as
zswap.nr_stored), which is now a global counter.

The counter is now awfully close to zswap_stored_pages.  The only
difference is that the latter also includes same-filled pages.  Also, when
memcgs are enabled, we use memcg_page_state(memcg, MEMCG_ZSWAPPED), which
includes same-filled pages anyway (i.e.  equivalent to
zswap_stored_pages).

Use zswap_stored_pages instead in zswap_shrinker_count() to keep things
consistent whether memcgs are enabled or not, and add a comment about the
number of freeable pages possibly being scaled down more than it should if
we have lots of same-filled pages (i.e.  inflated compression ratio).

Remove nr_zswap_stored and one atomic operation in the store and free
paths.

Link: https://lkml.kernel.org/r/20240322001001.1562517-1-yosryahmed@google.com
Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
Reviewed-by: Nhat Pham <nphamcs@gmail.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Chengming Zhou <chengming.zhou@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-04-25 20:56:05 -07:00
arch mm: vmalloc: enable memory allocation profiling 2024-04-25 20:55:57 -07:00
block block-6.9-20240412 2024-04-12 10:22:33 -07:00
certs This update includes the following changes: 2023-11-02 16:15:30 -10:00
crypto This push fixes a regression that broke iwd as well as a divide by 2024-03-25 10:48:23 -07:00
Documentation memprofiling: documentation 2024-04-25 20:55:58 -07:00
drivers mm: change inlined allocation helpers to account at the call site 2024-04-25 20:55:59 -07:00
fs mm: change inlined allocation helpers to account at the call site 2024-04-25 20:55:59 -07:00
include mm: page_alloc: consolidate free page accounting 2024-04-25 20:56:04 -07:00
init mm: introduce slabobj_ext to support slab object extensions 2024-04-25 20:55:51 -07:00
io_uring io_uring/net: restore msg_control on sendzc retry 2024-04-08 21:48:41 -06:00
ipc sysctl changes for v6.9-rc1 2024-03-18 14:59:13 -07:00
kernel mm: free up PG_slab 2024-04-25 20:56:00 -07:00
lib alloc_tag: Tighten file permissions on /proc/allocinfo 2024-04-25 20:55:59 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm: zswap: remove nr_zswap_stored atomic 2024-04-25 20:56:05 -07:00
net mm: change inlined allocation helpers to account at the call site 2024-04-25 20:55:59 -07:00
rust rust: add a rust helper for krealloc() 2024-04-25 20:55:55 -07:00
samples Tracing updates for 6.9: 2024-03-18 15:11:44 -07:00
scripts lib: add allocation tagging support for memory allocation profiling 2024-04-25 20:55:52 -07:00
security security: Place security_path_post_mknod() where the original IMA call was 2024-04-03 10:21:32 -07:00
sound fix missing vmalloc.h includes 2024-04-25 20:55:49 -07:00
tools selftests/mm: run_vmtests.sh: fix hugetlb mem size calculation 2024-04-25 20:56:02 -07:00
usr Kbuild updates for v6.8 2024-01-18 17:57:07 -08:00
virt KVM Xen and pfncache changes for 6.9: 2024-03-11 10:42:55 -04:00
.clang-format clang-format: Update with v6.7-rc4's for_each macro list 2023-12-08 23:54:38 +01:00
.cocciconfig
.editorconfig Add .editorconfig file for basic formatting 2023-12-28 16:22:47 +09:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: create a list of all built DTB files 2024-02-19 18:20:39 +09:00
.mailmap MAINTAINERS: update Naoya Horiguchi's email address 2024-04-16 15:39:51 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Drop Gustavo Pimentel as PCI DWC Maintainer 2024-03-27 13:41:02 -05:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: add entries for code tagging and memory allocation profiling 2024-04-25 20:55:58 -07:00
Makefile Linux 6.9-rc4 2024-04-14 13:38:39 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -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 reStructuredText 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.