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Kirill A. Shutemov b77471c676 mm: fix endless reclaim on machines with unaccepted memory 
[ Upstream commit 807174a93d ]

Unaccepted memory is considered unusable free memory, which is not counted
as free on the zone watermark check.  This causes get_page_from_freelist()
to accept more memory to hit the high watermark, but it creates problems
in the reclaim path.

The reclaim path encounters a failed zone watermark check and attempts to
reclaim memory.  This is usually successful, but if there is little or no
reclaimable memory, it can result in endless reclaim with little to no
progress.  This can occur early in the boot process, just after start of
the init process when the only reclaimable memory is the page cache of the
init executable and its libraries.

Make unaccepted memory free from watermark check point of view.  This way
unaccepted memory will never be the trigger of memory reclaim.  Accept
more memory in the get_page_from_freelist() if needed.

Link: https://lkml.kernel.org/r/20240809114854.3745464-2-kirill.shutemov@linux.intel.com
Fixes: dcdfdd40fa ("mm: Add support for unaccepted memory")
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reported-by: Jianxiong Gao <jxgao@google.com>
Acked-by: David Hildenbrand <david@redhat.com>
Tested-by: Jianxiong Gao <jxgao@google.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: <stable@vger.kernel.org>	[6.5+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-08-29 17:33:42 +02:00
arch riscv: entry: always initialize regs->a0 to -ENOSYS 2024-08-29 17:33:42 +02:00
block block: Fix lockdep warning in blk_mq_mark_tag_wait 2024-08-29 17:33:30 +02:00
certs certs: Reference revocation list for all keyrings 2023-08-17 20:12:41 +00:00
crypto crypto: aead,cipher - zeroize key buffer after use 2024-07-11 12:49:04 +02:00
Documentation cpu/SMT: Enable SMT only if a core is online 2024-08-29 17:33:30 +02:00
drivers dm suspend: return -ERESTARTSYS instead of -EINTR 2024-08-29 17:33:42 +02:00
fs jfs: define xtree root and page independently 2024-08-29 17:33:42 +02:00
include f2fs: stop checkpoint when get a out-of-bounds segment 2024-08-29 17:33:36 +02:00
init rust: fix the default format for CONFIG_{RUSTC,BINDGEN}_VERSION_TEXT 2024-08-29 17:33:29 +02:00
io_uring io_uring: fix io_match_task must_hold 2024-08-03 08:54:41 +02:00
ipc sysctl: treewide: drop unused argument ctl_table_root::set_ownership(table) 2024-08-11 12:47:13 +02:00
kernel hrtimer: Prevent queuing of hrtimer without a function callback 2024-08-29 17:33:41 +02:00
lib sched/topology: Handle NUMA_NO_NODE in sched_numa_find_nth_cpu() 2024-08-29 17:33:24 +02:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm: fix endless reclaim on machines with unaccepted memory 2024-08-29 17:33:42 +02:00
net Revert "bpf, sockmap: Prevent lock inversion deadlock in map delete elem" 2024-08-29 17:33:41 +02:00
rust rust: kernel: require Send for Module implementations 2024-05-17 12:01:56 +02:00
samples bpf: Replace bpf_lpm_trie_key 0-length array with flexible array 2024-08-19 06:04:27 +02:00
scripts rust: work around bindgen 0.69.0 issue 2024-08-29 17:33:29 +02:00
security evm: don't copy up 'security.evm' xattr 2024-08-29 17:33:31 +02:00
sound ASoC: SOF: ipc4: check return value of snd_sof_ipc_msg_data 2024-08-29 17:33:31 +02:00
tools selftests/bpf: Fix a few tests for GCC related warnings. 2024-08-29 17:33:40 +02:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin() 2024-06-27 13:49:11 +02:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: rpm-pkg: rename binkernel.spec to kernel.spec 2023-07-25 00:59:33 +09:00
.mailmap 20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues 2023-10-24 09:52:16 -10:00
.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 USB: Remove Wireless USB and UWB documentation 2023-08-09 14:17:32 +02:00
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 pwm: Rename pwm_apply_state() to pwm_apply_might_sleep() 2024-06-12 11:12:24 +02:00
Makefile Linux 6.6.47 2024-08-19 06:04:32 +02:00
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.