From: Chaitanya S Prakash <chaitanyas.prakash@arm.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: Chaitanya S Prakash <chaitanyas.prakash@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Shuah Khan <shuah@kernel.org>,
linux-kselftest@vger.kernel.org
Subject: [PATCH 2/3] selftests: Change NR_CHUNKS_HIGH for aarch64
Date: Tue, 14 Mar 2023 09:53:50 +0530 [thread overview]
Message-ID: <20230314042351.13134-3-chaitanyas.prakash@arm.com> (raw)
In-Reply-To: <20230314042351.13134-1-chaitanyas.prakash@arm.com>
Although there is a provision for 52 bit VA on arm64 platform, it remains
unutilised and higher addresses are not allocated. In order to accommodate
4PB [2^52] virtual address space where supported, NR_CHUNKS_HIGH is changed
accordingly.
Array holding addresses is changed from static allocation to dynamic
allocation to accommodate its voluminous nature which otherwise might
overflow the stack.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: linux-mm@kvack.org
Cc: linux-kselftest@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Chaitanya S Prakash <chaitanyas.prakash@arm.com>
---
tools/testing/selftests/mm/virtual_address_range.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/tools/testing/selftests/mm/virtual_address_range.c b/tools/testing/selftests/mm/virtual_address_range.c
index 50564512c5ee..bae0ceaf95b1 100644
--- a/tools/testing/selftests/mm/virtual_address_range.c
+++ b/tools/testing/selftests/mm/virtual_address_range.c
@@ -36,13 +36,15 @@
* till it reaches 512TB. One with size 128TB and the
* other being 384TB.
*
- * On Arm64 the address space is 256TB and no high mappings
- * are supported so far.
+ * On Arm64 the address space is 256TB and support for
+ * high mappings up to 4PB virtual address space has
+ * been added.
*/
#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)
+#define NR_CHUNKS_3840TB (NR_CHUNKS_128TB * 30UL)
#define ADDR_MARK_128TB (1UL << 47) /* First address beyond 128TB */
#define ADDR_MARK_256TB (1UL << 48) /* First address beyond 256TB */
@@ -51,7 +53,7 @@
#define HIGH_ADDR_MARK ADDR_MARK_256TB
#define HIGH_ADDR_SHIFT 49
#define NR_CHUNKS_LOW NR_CHUNKS_256TB
-#define NR_CHUNKS_HIGH 0
+#define NR_CHUNKS_HIGH NR_CHUNKS_3840TB
#else
#define HIGH_ADDR_MARK ADDR_MARK_128TB
#define HIGH_ADDR_SHIFT 48
@@ -101,7 +103,7 @@ static int validate_lower_address_hint(void)
int main(int argc, char *argv[])
{
char *ptr[NR_CHUNKS_LOW];
- char *hptr[NR_CHUNKS_HIGH];
+ char **hptr;
char *hint;
unsigned long i, lchunks, hchunks;
@@ -119,6 +121,9 @@ int main(int argc, char *argv[])
return 1;
}
lchunks = i;
+ hptr = (char **) calloc(NR_CHUNKS_HIGH, sizeof(char *));
+ if (hptr == NULL)
+ return 1;
for (i = 0; i < NR_CHUNKS_HIGH; i++) {
hint = hind_addr();
@@ -139,5 +144,6 @@ int main(int argc, char *argv[])
for (i = 0; i < hchunks; i++)
munmap(hptr[i], MAP_CHUNK_SIZE);
+ free(hptr);
return 0;
}
--
2.30.2
next prev parent reply other threads:[~2023-03-14 4:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-14 4:23 [PATCH 0/3] selftests: Fix virtual address range for arm64 Chaitanya S Prakash
2023-03-14 4:23 ` [PATCH 1/3] selftests: Change MAP_CHUNK_SIZE Chaitanya S Prakash
2023-03-14 4:23 ` Chaitanya S Prakash [this message]
2023-03-14 4:23 ` [PATCH 3/3] selftests: Set overcommit_policy as OVERCOMMIT_ALWAYS Chaitanya S Prakash
2023-03-16 15:31 ` David Hildenbrand
2023-03-20 6:47 ` Chaitanya S Prakash
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