Re: [PATCH 2/6] memblock tests: add the 129th memory block at all possible position

[Wei Yang <richard.weiyang@gmail.com>]

On Wed, Apr 17, 2024 at 08:51:14AM +0300, Mike Rapoport wrote:
>On Tue, Apr 16, 2024 at 12:55:31PM +0000, Wei Yang wrote:
>> On Mon, Apr 15, 2024 at 06:19:42PM +0300, Mike Rapoport wrote:
>> >On Sun, Apr 14, 2024 at 12:45:27AM +0000, Wei Yang wrote:
>> >> After previous change, we may double the array based on the position of
>> >> the new range.
>> >> 
>> >> Let's make sure the 129th memory block would double the size correctly
>> >> at all possible position.
>> >
>> >Rather than rewrite an existing test, just add a new one.
>> 
>> Ok, will add a new one for this.
>> 
>> >Besides, it would be more interesting to test additions to
>> >memblock.reserved and a mix of memblock_add() and memblock_reserve() that
>> >will require resizing the memblock arrays.
>> 
>> I don't get this very clearly. Would you mind give more hint?
>
>There is memblock_reserve_many_check() that verifies that memblock.reserved
>is properly resized. I think it's better to add test that adds 129th block
>at multiple locations to memblock.reserved.
> 

I write a draft as below, is this what you expect?

diff --git a/tools/testing/memblock/tests/basic_api.c b/tools/testing/memblock/tests/basic_api.c
index f1569ebb9872..d2b8114921f9 100644
--- a/tools/testing/memblock/tests/basic_api.c
+++ b/tools/testing/memblock/tests/basic_api.c
@@ -912,84 +912,94 @@ static int memblock_reserve_near_max_check(void)
  * memblock.memory.max, find a new valid memory as
  * reserved.regions.
  */
+/* Keep the gap so these memory region will not be merged. */
+#define MEMORY_BASE(idx) (SZ_128K + (MEM_SIZE * 2) * (idx))
 static int memblock_reserve_many_check(void)
 {
-	int i;
+	int i, skip;
 	void *orig_region;
 	struct region r = {
 		.base = SZ_16K,
 		.size = SZ_16K,
 	};
-	phys_addr_t memory_base = SZ_128K;
 	phys_addr_t new_reserved_regions_size;
 
 	PREFIX_PUSH();
 
-	reset_memblock_regions();
-	memblock_allow_resize();
+	/* Reserve the 129th memory block for all possible positions*/
+	for (skip = 0; skip < INIT_MEMBLOCK_REGIONS + 1; skip++)
+	{
+		reset_memblock_regions();
+		memblock_allow_resize();
 
-	/* Add a valid memory region used by double_array(). */
-	dummy_physical_memory_init();
-	memblock_add(dummy_physical_memory_base(), MEM_SIZE);
+		/* Add a valid memory region used by double_array(). */
+		dummy_physical_memory_init();
+		memblock_add(dummy_physical_memory_base(), MEM_SIZE);
 
-	for (i = 0; i < INIT_MEMBLOCK_REGIONS; i++) {
-		/* Reserve some fakes memory region to fulfill the memblock. */
-		memblock_reserve(memory_base, MEM_SIZE);
+		for (i = 0; i < INIT_MEMBLOCK_REGIONS + 1; i++) {
+			if (i == skip)
+				continue;
 
-		ASSERT_EQ(memblock.reserved.cnt, i + 1);
-		ASSERT_EQ(memblock.reserved.total_size, (i + 1) * MEM_SIZE);
+			/* Reserve some fakes memory region to fulfill the memblock. */
+			memblock_reserve(MEMORY_BASE(i), MEM_SIZE);
 
-		/* Keep the gap so these memory region will not be merged. */
-		memory_base += MEM_SIZE * 2;
-	}
+			if (i < skip) {
+				ASSERT_EQ(memblock.reserved.cnt, i + 1);
+				ASSERT_EQ(memblock.reserved.total_size, (i + 1) * MEM_SIZE);
+			} else {
+				ASSERT_EQ(memblock.reserved.cnt, i);
+				ASSERT_EQ(memblock.reserved.total_size, i * MEM_SIZE);
+			}
+		}
 
-	orig_region = memblock.reserved.regions;
-
-	/* This reserve the 129 memory_region, and makes it double array. */
-	memblock_reserve(memory_base, MEM_SIZE);
-
-	/*
-	 * This is the memory region size used by the doubled reserved.regions,
-	 * and it has been reserved due to it has been used. The size is used to
-	 * calculate the total_size that the memblock.reserved have now.
-	 */
-	new_reserved_regions_size = PAGE_ALIGN((INIT_MEMBLOCK_REGIONS * 2) *
-					sizeof(struct memblock_region));
-	/*
-	 * The double_array() will find a free memory region as the new
-	 * reserved.regions, and the used memory region will be reserved, so
-	 * there will be one more region exist in the reserved memblock. And the
-	 * one more reserved region's size is new_reserved_regions_size.
-	 */
-	ASSERT_EQ(memblock.reserved.cnt, INIT_MEMBLOCK_REGIONS + 2);
-	ASSERT_EQ(memblock.reserved.total_size, (INIT_MEMBLOCK_REGIONS + 1) * MEM_SIZE +
-						new_reserved_regions_size);
-	ASSERT_EQ(memblock.reserved.max, INIT_MEMBLOCK_REGIONS * 2);
-
-	/*
-	 * Now memblock_double_array() works fine. Let's check after the
-	 * double_array(), the memblock_reserve() still works as normal.
-	 */
-	memblock_reserve(r.base, r.size);
-	ASSERT_EQ(memblock.reserved.regions[0].base, r.base);
-	ASSERT_EQ(memblock.reserved.regions[0].size, r.size);
-
-	ASSERT_EQ(memblock.reserved.cnt, INIT_MEMBLOCK_REGIONS + 3);
-	ASSERT_EQ(memblock.reserved.total_size, (INIT_MEMBLOCK_REGIONS + 1) * MEM_SIZE +
-						new_reserved_regions_size +
-						r.size);
-	ASSERT_EQ(memblock.reserved.max, INIT_MEMBLOCK_REGIONS * 2);
-
-	dummy_physical_memory_cleanup();
-
-	/*
-	 * The current reserved.regions is occupying a range of memory that
-	 * allocated from dummy_physical_memory_init(). After free the memory,
-	 * we must not use it. So restore the origin memory region to make sure
-	 * the tests can run as normal and not affected by the double array.
-	 */
-	memblock.reserved.regions = orig_region;
-	memblock.reserved.cnt = INIT_MEMBLOCK_RESERVED_REGIONS;
+		orig_region = memblock.reserved.regions;
+
+		/* This reserve the 129 memory_region, and makes it double array. */
+		memblock_reserve(MEMORY_BASE(skip), MEM_SIZE);
+
+		/*
+		 * This is the memory region size used by the doubled reserved.regions,
+		 * and it has been reserved due to it has been used. The size is used to
+		 * calculate the total_size that the memblock.reserved have now.
+		 */
+		new_reserved_regions_size = PAGE_ALIGN((INIT_MEMBLOCK_REGIONS * 2) *
+						sizeof(struct memblock_region));
+		/*
+		 * The double_array() will find a free memory region as the new
+		 * reserved.regions, and the used memory region will be reserved, so
+		 * there will be one more region exist in the reserved memblock. And the
+		 * one more reserved region's size is new_reserved_regions_size.
+		 */
+		ASSERT_EQ(memblock.reserved.cnt, INIT_MEMBLOCK_REGIONS + 2);
+		ASSERT_EQ(memblock.reserved.total_size, (INIT_MEMBLOCK_REGIONS + 1) * MEM_SIZE +
+							new_reserved_regions_size);
+		ASSERT_EQ(memblock.reserved.max, INIT_MEMBLOCK_REGIONS * 2);
+
+		/*
+		 * Now memblock_double_array() works fine. Let's check after the
+		 * double_array(), the memblock_reserve() still works as normal.
+		 */
+		memblock_reserve(r.base, r.size);
+		ASSERT_EQ(memblock.reserved.regions[0].base, r.base);
+		ASSERT_EQ(memblock.reserved.regions[0].size, r.size);
+
+		ASSERT_EQ(memblock.reserved.cnt, INIT_MEMBLOCK_REGIONS + 3);
+		ASSERT_EQ(memblock.reserved.total_size, (INIT_MEMBLOCK_REGIONS + 1) * MEM_SIZE +
+							new_reserved_regions_size +
+							r.size);
+		ASSERT_EQ(memblock.reserved.max, INIT_MEMBLOCK_REGIONS * 2);
+
+		dummy_physical_memory_cleanup();
+
+		/*
+		 * The current reserved.regions is occupying a range of memory that
+		 * allocated from dummy_physical_memory_init(). After free the memory,
+		 * we must not use it. So restore the origin memory region to make sure
+		 * the tests can run as normal and not affected by the double array.
+		 */
+		memblock.reserved.regions = orig_region;
+		memblock.reserved.cnt = INIT_MEMBLOCK_RESERVED_REGIONS;
+	}
 
 	test_pass_pop();
 
-- 
2.34.1


>> -- 
>> Wei Yang
>> Help you, Help me
>
>-- 
>Sincerely yours,
>Mike.

-- 
Wei Yang
Help you, Help me