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Frank van der Linden 8d88b0769e mm/hugetlb: use separate nodemask for bootmem allocations 
Hugetlb boot allocation has used online nodes for allocation since commit
de55996d71 ("mm/hugetlb: use online nodes for bootmem allocation"). 
This was needed to be able to do the allocations earlier in boot, before
N_MEMORY was set.

This might lead to a different distribution of gigantic hugepages across
NUMA nodes if there are memoryless nodes in the system.

What happens is that the memoryless nodes are tried, but then the memblock
allocation fails and falls back, which usually means that the node that
has the highest physical address available will be used (top-down
allocation).  While this will end up getting the same number of hugetlb
pages, they might not be be distributed the same way.  The fallback for
each memoryless node might not end up coming from the same node as the
successful round-robin allocation from N_MEMORY nodes.

While administrators that rely on having a specific number of hugepages
per node should use the hugepages=N:X syntax, it's better not to change
the old behavior for the plain hugepages=N case.

To do this, construct a nodemask for hugetlb bootmem purposes only,
containing nodes that have memory.  Then use that for round-robin bootmem
allocations.

This saves some cycles, and the added advantage here is that hugetlb_cma
can use it too, avoiding the older issue of pointless attempts to create a
CMA area for memoryless nodes (which will also cause the per-node CMA area
size to be too small).

Link: https://lkml.kernel.org/r/20250402205613.3086864-1-fvdl@google.com
Fixes: de55996d71 ("mm/hugetlb: use online nodes for bootmem allocation")
Signed-off-by: Frank van der Linden <fvdl@google.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: Luiz Capitulino <luizcap@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2025-05-12 23:50:35 -07:00
arch mm: convert free_page_and_swap_cache() to free_folio_and_swap_cache() 2025-05-11 17:48:32 -07:00
block block-6.15-20250509 2025-05-09 10:34:50 -07:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: scompress - increment scomp_scratch_users when already allocated 2025-04-25 10:33:30 +08:00
Documentation vmscan,cgroup: apply mems_effective to reclaim 2025-05-12 23:50:33 -07:00
drivers zram: modernize writeback interface 2025-05-11 17:48:09 -07:00
fs fs/proc/page: refactor to reduce code duplication 2025-05-11 17:48:20 -07:00
include mm/hugetlb: use separate nodemask for bootmem allocations 2025-05-12 23:50:35 -07:00
init mm/memcg: move mem_cgroup_init() ahead of cgroup_init() 2025-05-12 23:50:34 -07:00
io_uring io_uring/sqpoll: Increase task_work submission batch size 2025-05-09 07:56:53 -06:00
ipc treewide: const qualify ctl_tables where applicable 2025-01-28 13:48:37 +01:00
kernel vmscan,cgroup: apply mems_effective to reclaim 2025-05-12 23:50:33 -07:00
lib lib/test_vmalloc.c: allow built-in execution 2025-05-11 17:48:34 -07:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm/hugetlb: use separate nodemask for bootmem allocations 2025-05-12 23:50:35 -07:00
net net: export a helper for adding up queue stats 2025-05-08 11:56:12 +02:00
rust task: rust: rework how current is accessed 2025-05-11 17:48:25 -07:00
samples samples/damon: implement a DAMON module for memory tiering 2025-05-12 23:50:30 -07:00
scripts scripts: Do not strip .rela.dyn section 2025-05-08 12:01:01 +00:00
security Landlock fix for v6.15-rc4 2025-04-24 12:59:05 -07:00
sound ASoC: Fixes for v6.15 2025-05-01 10:22:20 +02:00
tools selftests/damon: remove the remaining test scripts for DAMON debugfs interface 2025-05-11 17:48:30 -07:00
usr kbuild: hdrcheck: fix cross build with clang 2025-03-05 04:06:45 +09:00
virt ARM: 2025-04-08 13:47:55 -07:00
.clang-format clang-format: Update the ForEachMacros list for v6.15-rc1 2025-04-13 11:03:59 +02:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: Retire Ralf Baechle 2024-11-12 15:48:59 +01:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: Create intermediate vmlinux build with relocations preserved 2025-03-17 00:29:50 +09:00
.mailmap Input updates for v6.15-rc5 2025-05-11 10:29:29 -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 Update Christoph's Email address and make it consistent 2025-05-12 23:50:31 -07:00
Kbuild drm: ensure drm headers are self-contained and pass kernel-doc 2025-02-12 10:44:43 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS Update Christoph's Email address and make it consistent 2025-05-12 23:50:31 -07:00
Makefile Linux 6.15-rc6 2025-05-11 14:54:11 -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.