linux-kernel - Re: [PATCH v2 6/7] selftests/mm: Skip thuge-gen if shmmax is too small or no 1G huge pages

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Message-ID: <31D5CD80-4154-4997-AAD3-E6EBE244688D@nvidia.com>
Date: Thu, 03 Jul 2025 10:43:24 -0400
From: Zi Yan <ziy@...dia.com>
To: Aboorva Devarajan <aboorvad@...ux.ibm.com>
Cc: akpm@...ux-foundation.org, Liam.Howlett@...cle.com,
 lorenzo.stoakes@...cle.com, shuah@...nel.org, pfalcato@...e.de,
 david@...hat.com, baolin.wang@...ux.alibaba.com, npache@...hat.com,
 ryan.roberts@....com, dev.jain@....com, baohua@...nel.org,
 linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
 linux-kernel@...r.kernel.org, donettom@...ux.ibm.com, ritesh.list@...il.com
Subject: Re: [PATCH v2 6/7] selftests/mm: Skip thuge-gen if shmmax is too
 small or no 1G huge pages

On 3 Jul 2025, at 2:06, Aboorva Devarajan wrote:

> Make thuge-gen skip instead of fail when it can't run due to system
> settings. If shmmax is too small or no 1G huge pages are available,
> the test now prints a warning and is marked as skipped.
>
> -------------------
> Before Patch:
> -------------------
> ~ running ./thuge-gen
> ~ Bail out! Please do echo 262144 > /proc/sys/kernel/shmmax
> ~ Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0
> ~ [FAIL]
> not ok 28 thuge-gen ~ exit=1
>
> -------------------
> After Patch:
> -------------------
> ~ running ./thuge-gen
> ~ ~ WARNING: shmmax is too small to run this test.
> ~ ~ Please run the following command to increase shmmax:
> ~ ~ echo 262144 > /proc/sys/kernel/shmmax
> ~ 1..0 ~ SKIP Test skipped due to insufficient shmmax value.
> ~ [SKIP]
> ok 29 thuge-gen ~ SKIP
>
> Signed-off-by: Aboorva Devarajan <aboorvad@...ux.ibm.com>
> ---
>  tools/testing/selftests/mm/thuge-gen.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
>
Reviewed-by: Zi Yan <ziy@...dia.com>

Best Regards,
Yan, Zi