linux-kernel - Re: [PATCH] selftests/mm: run_vmtests.sh: Fix hugetlb mem size calculation

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Date: Sun, 24 Mar 2024 22:56:24 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: peterx@...hat.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc: Muhammad Usama Anjum <usama.anjum@...labora.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 David Hildenbrand <david@...hat.com>, Nico Pache <npache@...hat.com>,
 Muchun Song <muchun.song@...ux.dev>
Subject: Re: [PATCH] selftests/mm: run_vmtests.sh: Fix hugetlb mem size
 calculation

On 3/22/24 2:50 AM, peterx@...hat.com wrote:
> From: Peter Xu <peterx@...hat.com>
> 
> The script calculates a mininum required size of hugetlb memories, but
> it'll stop working with <1MB huge page sizes, reporting all zeros even if
> huge pages are available.
> 
> In reality, the calculation doesn't really need to be as comlicated either.
> Make it simpler and work for KB-level hugepages too.
> 
> Cc: Muhammad Usama Anjum <usama.anjum@...labora.com>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Nico Pache <npache@...hat.com>
> Cc: Muchun Song <muchun.song@...ux.dev>
> Signed-off-by: Peter Xu <peterx@...hat.com>
Reviewed-by: Muhammad Usama Anjum <usama.anjum@...labora.com>

> ---
>  tools/testing/selftests/mm/run_vmtests.sh | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh
> index c2c542fe7b17..b1b78e45d613 100755
> --- a/tools/testing/selftests/mm/run_vmtests.sh
> +++ b/tools/testing/selftests/mm/run_vmtests.sh
> @@ -152,9 +152,13 @@ done < /proc/meminfo
>  # both of these requirements into account and attempt to increase
>  # number of huge pages available.
>  nr_cpus=$(nproc)
> -hpgsize_MB=$((hpgsize_KB / 1024))
> -half_ufd_size_MB=$((((nr_cpus * hpgsize_MB + 127) / 128) * 128))
> -needmem_KB=$((half_ufd_size_MB * 2 * 1024))
> +uffd_min_KB=$((hpgsize_KB * nr_cpus * 2))
> +hugetlb_min_KB=$((256 * 1024))
> +if [[ $uffd_min_KB -gt $hugetlb_min_KB ]]; then
> +	needmem_KB=$uffd_min_KB
> +else
> +	needmem_KB=$hugetlb_min_KB
> +fi
>  
>  # set proper nr_hugepages
>  if [ -n "$freepgs" ] && [ -n "$hpgsize_KB" ]; then

-- 
BR,
Muhammad Usama Anjum