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mm: hugetlb: log time needed to allocate hugepages

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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 <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>
This commit is contained in:
Thomas Prescher 2025-02-27 23:45:07 +01:00 committed by Andrew Morton
parent 71f7456889
commit 70478a5534
1 changed files with 10 additions and 0 deletions
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10
mm/hugetlb.c
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@ -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;
}