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| author | Thomas Prescher <thomas.prescher@cyberus-technology.de> | 2025-02-27 23:45:06 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-03-17 00:05:36 -0700 |
| commit | 71f745688985c59eee41ffe88497a9e62774a9bf (patch) | |
| tree | 08e146053b20def4578cc7b9975b264550bc1500 /Documentation/admin-guide | |
| parent | c34b3eceeac64d59f8b475046501faa5d8daa5a4 (diff) | |
| download | ath-71f745688985c59eee41ffe88497a9e62774a9bf.tar.gz | |
mm: hugetlb: add hugetlb_alloc_threads cmdline option
Add a command line option that enables control of how many threads should
be used to allocate huge pages.
[akpm@linux-foundation.org: tidy up a comment]
Link: https://lkml.kernel.org/r/20250227-hugepage-parameter-v2-2-7db8c6dc0453@cyberus-technology.de
Signed-off-by: Thomas Prescher <thomas.prescher@cyberus-technology.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 9 | ||||
| -rw-r--r-- | Documentation/admin-guide/mm/hugetlbpage.rst | 10 |
2 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 491628ac071a5..2758bc124f16e 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1882,6 +1882,15 @@ Documentation/admin-guide/mm/hugetlbpage.rst. Format: size[KMG] + hugepage_alloc_threads= + [HW] The number of threads that should be used to + allocate hugepages during boot. This option can be + used to improve system bootup time when allocating + a large amount of huge pages. + The default value is 25% of the available hardware threads. + + Note that this parameter only applies to non-gigantic huge pages. + hugetlb_cma= [HW,CMA,EARLY] The size of a CMA area used for allocation of gigantic hugepages. Or using node format, the size of a CMA area per node can be specified. diff --git a/Documentation/admin-guide/mm/hugetlbpage.rst b/Documentation/admin-guide/mm/hugetlbpage.rst index f34a0d798d5b5..67a941903fd22 100644 --- a/Documentation/admin-guide/mm/hugetlbpage.rst +++ b/Documentation/admin-guide/mm/hugetlbpage.rst @@ -145,7 +145,17 @@ hugepages It will allocate 1 2M hugepage on node0 and 2 2M hugepages on node1. If the node number is invalid, the parameter will be ignored. +hugepage_alloc_threads + Specify the number of threads that should be used to allocate hugepages + during boot. This parameter can be used to improve system bootup time + when allocating a large amount of huge pages. + The default value is 25% of the available hardware threads. + Example to use 8 allocation threads:: + + hugepage_alloc_threads=8 + + Note that this parameter only applies to non-gigantic huge pages. default_hugepagesz Specify the default huge page size. This parameter can only be specified once on the command line. default_hugepagesz can |