From 70478a5534af757f9bbc65bbb25b607bd0e69890 Mon Sep 17 00:00:00 2001 From: Thomas Prescher Date: Thu, 27 Feb 2025 23:45:07 +0100 Subject: [PATCH] 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: Thomas Prescher Cc: Jonathan Corbet Cc: Muchun Song Signed-off-by: Andrew Morton --- mm/hugetlb.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 486365cb2ece9..7a47a08e8526c 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -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; } -- 2.50.1