linux-kernel - [PATCH 1/3] selftests: Change MAP_CHUNK

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Date:   Tue, 14 Mar 2023 09:53:49 +0530
From:   Chaitanya S Prakash <chaitanyas.prakash@....com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Chaitanya S Prakash <chaitanyas.prakash@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org
Subject: [PATCH 1/3] selftests: Change MAP_CHUNK_SIZE

mmap() fails to allocate 16GB virtual space chunk, skipping both low and
high VA range iterations. Hence, reduce MAP_CHUNK_SIZE to 1GB and update
relevant macros as required.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Shuah Khan <shuah@...nel.org>
Cc: linux-mm@...ck.org
Cc: linux-kselftest@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Chaitanya S Prakash <chaitanyas.prakash@....com>
---
 tools/testing/selftests/mm/virtual_address_range.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/mm/virtual_address_range.c b/tools/testing/selftests/mm/virtual_address_range.c
index c0592646ed93..50564512c5ee 100644
--- a/tools/testing/selftests/mm/virtual_address_range.c
+++ b/tools/testing/selftests/mm/virtual_address_range.c
@@ -15,11 +15,15 @@
 
 /*
  * Maximum address range mapped with a single mmap()
- * call is little bit more than 16GB. Hence 16GB is
+ * call is little bit more than 1GB. Hence 1GB is
  * chosen as the single chunk size for address space
  * mapping.
  */
-#define MAP_CHUNK_SIZE   17179869184UL /* 16GB */
+
+#define SZ_1GB	(1024 * 1024 * 1024UL)
+#define SZ_1TB	(1024 * 1024 * 1024 * 1024UL)
+
+#define MAP_CHUNK_SIZE	SZ_1GB
 
 /*
  * Address space till 128TB is mapped without any hint
@@ -36,7 +40,7 @@
  * are supported so far.
  */
 
-#define NR_CHUNKS_128TB   8192UL /* Number of 16GB chunks for 128TB */
+#define NR_CHUNKS_128TB   ((128 * SZ_1TB) / MAP_CHUNK_SIZE) /* Number of chunks for 128TB */
 #define NR_CHUNKS_256TB   (NR_CHUNKS_128TB * 2UL)
 #define NR_CHUNKS_384TB   (NR_CHUNKS_128TB * 3UL)
 
-- 
2.30.2