linux-kernel - [PATCH 6/6] selftests/mm: Mark thuge-gen as skipped if shmmax is too small or no 1G pages

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Message-ID: <20250616160632.35250-7-aboorvad@linux.ibm.com>
Date: Mon, 16 Jun 2025 21:36:32 +0530
From: Aboorva Devarajan <aboorvad@...ux.ibm.com>
To: akpm@...ux-foundation.org, Liam.Howlett@...cle.com,
        lorenzo.stoakes@...cle.com, shuah@...nel.org, pfalcato@...e.de,
        david@...hat.com, ziy@...dia.com, baolin.wang@...ux.alibaba.com,
        npache@...hat.com, ryan.roberts@....com, dev.jain@....com,
        baohua@...nel.org
Cc: linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, donettom@...ux.ibm.com,
        ritesh.list@...il.com, aboorvad@...ux.ibm.com
Subject: [PATCH 6/6] selftests/mm: Mark thuge-gen as skipped if shmmax is too small or no 1G pages

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
-------------------
~ TAP version 13
~ 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
-------------------
~ TAP version 13
~ ~ 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(-)

diff --git a/tools/testing/selftests/mm/thuge-gen.c b/tools/testing/selftests/mm/thuge-gen.c
index 95b6f043a3cb..cc302a29d485 100644
--- a/tools/testing/selftests/mm/thuge-gen.c
+++ b/tools/testing/selftests/mm/thuge-gen.c
@@ -195,13 +195,16 @@ void find_pagesizes(void)
 	}
 	globfree(&g);
 
-	if (thuge_read_sysfs(0, "/proc/sys/kernel/shmmax") < NUM_PAGES * largest)
-		ksft_exit_fail_msg("Please do echo %lu > /proc/sys/kernel/shmmax",
-				   largest * NUM_PAGES);
+	if (thuge_read_sysfs(0, "/proc/sys/kernel/shmmax") < NUM_PAGES * largest) {
+		ksft_print_msg("WARNING: shmmax is too small to run this test.\n");
+		ksft_print_msg("Please run the following command to increase shmmax:\n");
+		ksft_print_msg("echo %lu > /proc/sys/kernel/shmmax\n", largest * NUM_PAGES);
+		ksft_exit_skip("Test skipped due to insufficient shmmax value.\n");
+	}
 
 #if defined(__x86_64__)
 	if (largest != 1U<<30) {
-		ksft_exit_fail_msg("No GB pages available on x86-64\n"
+		ksft_exit_skip("No GB pages available on x86-64\n"
 				   "Please boot with hugepagesz=1G hugepages=%d\n", NUM_PAGES);
 	}
 #endif
-- 
2.43.5