Commit 70478a55 authored by Thomas Prescher's avatar Thomas Prescher Committed by Andrew Morton
Browse files

mm: hugetlb: log time needed to allocate hugepages 

Having this information allows users to easily tune the
hugepages_node_threads parameter.

Link: https://lkml.kernel.org/r/20250227-hugepage-parameter-v2-3-7db8c6dc0453@cyberus-technology.de


Signed-off-by: default avatarThomas Prescher <thomas.prescher@cyberus-technology.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 71f74568

mm/hugetlb.c

+10 −0
Original line number Diff line number Diff line
@@ -3608,6 +3608,9 @@ static unsigned long __init hugetlb_pages_alloc_boot(struct hstate *h) 
		.numa_aware	= true

	};



	unsigned long jiffies_start;

	unsigned long jiffies_end;



	job.thread_fn	= hugetlb_pages_alloc_boot_node;

	job.start	= 0;

	job.size	= h->max_huge_pages;
@@ -3635,7 +3638,14 @@ static unsigned long __init hugetlb_pages_alloc_boot(struct hstate *h) 


	job.max_threads	= hugepage_allocation_threads;

	job.min_chunk	= h->max_huge_pages / hugepage_allocation_threads;



	jiffies_start = jiffies;

	padata_do_multithreaded(&job);

	jiffies_end = jiffies;



	pr_info("HugeTLB: allocation took %dms with hugepage_allocation_threads=%ld\n",

		jiffies_to_msecs(jiffies_end - jiffies_start),

		hugepage_allocation_threads);



	return h->nr_huge_pages;

}