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Date: Tue, 16 Aug 2022 10:24:42 +0800
From: "Huang, Shaoqin" <shaoqin.huang@...el.com>
To: Rebecca Mckeever <remckee0@...il.com>
CC: Mike Rapoport <rppt@...nel.org>, <linux-mm@...ck.org>,
<linux-kernel@...r.kernel.org>,
David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH 1/8] memblock tests: update tests to check if
memblock_alloc zeroed memory
On 8/16/2022 10:15 AM, Rebecca Mckeever wrote:
> On Mon, Aug 15, 2022 at 04:50:51PM +0800, Huang, Shaoqin wrote:
>> Hi, Rebecca.
>>
>> On 8/14/2022 1:53 PM, Rebecca Mckeever wrote:
>>> Add an assert in memblock_alloc() tests where allocation is expected to
>>> occur. The assert checks whether the entire chunk of allocated memory is
>>> cleared.
>>>
>>> The current memblock_alloc() tests do not check whether the allocated
>>> memory was zeroed. memblock_alloc() should zero the allocated memory since
>>> it is a wrapper for memblock_alloc_try_nid().
>>>
>>> Signed-off-by: Rebecca Mckeever <remckee0@...il.com>
>>> ---
>>> tools/testing/memblock/tests/alloc_api.c | 24 ++++++++++++++++++++++++
>>> tools/testing/memblock/tests/common.c | 7 +++++++
>>> tools/testing/memblock/tests/common.h | 13 +++++++++++++
>>> 3 files changed, 44 insertions(+)
>>>
>>> diff --git a/tools/testing/memblock/tests/alloc_api.c b/tools/testing/memblock/tests/alloc_api.c
>>> index a14f38eb8a89..71c89cb9b2a8 100644
>>> --- a/tools/testing/memblock/tests/alloc_api.c
>>> +++ b/tools/testing/memblock/tests/alloc_api.c
>>> @@ -22,6 +22,8 @@ static int alloc_top_down_simple_check(void)
>>> allocated_ptr = memblock_alloc(size, SMP_CACHE_BYTES);
>>> ASSERT_NE(allocated_ptr, NULL);
>>> + ASSERT_MEM_EQ((char *)allocated_ptr, 0, size);
>>> +
>>> ASSERT_EQ(rgn->size, size);
>>> ASSERT_EQ(rgn->base, expected_start);
>>> @@ -80,6 +82,8 @@ static int alloc_top_down_disjoint_check(void)
>>> allocated_ptr = memblock_alloc(r2_size, alignment);
>>> ASSERT_NE(allocated_ptr, NULL);
>>> + ASSERT_MEM_EQ((char *)allocated_ptr, 0, r2_size);
>>> +
>>> ASSERT_EQ(rgn1->size, r1.size);
>>> ASSERT_EQ(rgn1->base, r1.base);
>>> @@ -125,6 +129,8 @@ static int alloc_top_down_before_check(void)
>>> allocated_ptr = memblock_alloc(r2_size, SMP_CACHE_BYTES);
>>> ASSERT_NE(allocated_ptr, NULL);
>>> + ASSERT_MEM_EQ((char *)allocated_ptr, 0, r2_size);
>>> +
>>> ASSERT_EQ(rgn->size, total_size);
>>> ASSERT_EQ(rgn->base, memblock_end_of_DRAM() - total_size);
>>> @@ -173,6 +179,8 @@ static int alloc_top_down_after_check(void)
>>> allocated_ptr = memblock_alloc(r2_size, SMP_CACHE_BYTES);
>>> ASSERT_NE(allocated_ptr, NULL);
>>> + ASSERT_MEM_EQ((char *)allocated_ptr, 0, r2_size);
>>> +
>>> ASSERT_EQ(rgn->size, total_size);
>>> ASSERT_EQ(rgn->base, r1.base - r2_size);
>>> @@ -223,6 +231,8 @@ static int alloc_top_down_second_fit_check(void)
>>> allocated_ptr = memblock_alloc(r3_size, SMP_CACHE_BYTES);
>>> ASSERT_NE(allocated_ptr, NULL);
>>> + ASSERT_MEM_EQ((char *)allocated_ptr, 0, r3_size);
>>> +
>>> ASSERT_EQ(rgn->size, r2.size + r3_size);
>>> ASSERT_EQ(rgn->base, r2.base - r3_size);
>>> @@ -277,6 +287,8 @@ static int alloc_in_between_generic_check(void)
>>> allocated_ptr = memblock_alloc(r3_size, SMP_CACHE_BYTES);
>>> ASSERT_NE(allocated_ptr, NULL);
>>> + ASSERT_MEM_EQ((char *)allocated_ptr, 0, r3_size);
>>> +
>>> ASSERT_EQ(rgn->size, total_size);
>>> ASSERT_EQ(rgn->base, r1.base - r2.size - r3_size);
>>> @@ -418,6 +430,8 @@ static int alloc_limited_space_generic_check(void)
>>> allocated_ptr = memblock_alloc(available_size, SMP_CACHE_BYTES);
>>> ASSERT_NE(allocated_ptr, NULL);
>>> + ASSERT_MEM_EQ((char *)allocated_ptr, 0, available_size);
>>> +
>>> ASSERT_EQ(rgn->size, MEM_SIZE);
>>> ASSERT_EQ(rgn->base, memblock_start_of_DRAM());
>>> @@ -442,6 +456,7 @@ static int alloc_no_memory_generic_check(void)
>>> PREFIX_PUSH();
>>> reset_memblock_regions();
>>> + fill_memblock();
>>
>> Maybe we don't need this line, it has no effect at here. Anyway, Others
>> Looks Good to me.
>>
> Do you mean that it's not necessary since the test doesn't run
> verify_mem_content()?
>
Yes. And the test function name is alloc_no_memory_...(). So I just
think no memory operation in it may be same with the function name.
>> Reviewed-by: Shaoqin Huang <shaoqin.huang@...el.com>
>>
>>> allocated_ptr = memblock_alloc(SZ_1K, SMP_CACHE_BYTES);
>>> @@ -472,6 +487,8 @@ static int alloc_bottom_up_simple_check(void)
>>> allocated_ptr = memblock_alloc(SZ_2, SMP_CACHE_BYTES);
>>> ASSERT_NE(allocated_ptr, NULL);
>>> + ASSERT_MEM_EQ((char *)allocated_ptr, 0, SZ_2);
>>> +
>>> ASSERT_EQ(rgn->size, SZ_2);
>>> ASSERT_EQ(rgn->base, memblock_start_of_DRAM());
>>> @@ -528,6 +545,7 @@ static int alloc_bottom_up_disjoint_check(void)
>>> allocated_ptr = memblock_alloc(r2_size, alignment);
>>> ASSERT_NE(allocated_ptr, NULL);
>>> + ASSERT_MEM_EQ((char *)allocated_ptr, 0, r2_size);
>>> ASSERT_EQ(rgn1->size, r1.size);
>>> ASSERT_EQ(rgn1->base, r1.base);
>>> @@ -571,6 +589,8 @@ static int alloc_bottom_up_before_check(void)
>>> allocated_ptr = memblock_alloc(r1_size, SMP_CACHE_BYTES);
>>> ASSERT_NE(allocated_ptr, NULL);
>>> + ASSERT_MEM_EQ((char *)allocated_ptr, 0, r1_size);
>>> +
>>> ASSERT_EQ(rgn->size, total_size);
>>> ASSERT_EQ(rgn->base, memblock_start_of_DRAM());
>>> @@ -618,6 +638,8 @@ static int alloc_bottom_up_after_check(void)
>>> allocated_ptr = memblock_alloc(r2_size, SMP_CACHE_BYTES);
>>> ASSERT_NE(allocated_ptr, NULL);
>>> + ASSERT_MEM_EQ((char *)allocated_ptr, 0, r2_size);
>>> +
>>> ASSERT_EQ(rgn->size, total_size);
>>> ASSERT_EQ(rgn->base, r1.base);
>>> @@ -669,6 +691,8 @@ static int alloc_bottom_up_second_fit_check(void)
>>> allocated_ptr = memblock_alloc(r3_size, SMP_CACHE_BYTES);
>>> ASSERT_NE(allocated_ptr, NULL);
>>> + ASSERT_MEM_EQ((char *)allocated_ptr, 0, r3_size);
>>> +
>>> ASSERT_EQ(rgn->size, r2.size + r3_size);
>>> ASSERT_EQ(rgn->base, r2.base);
>>> diff --git a/tools/testing/memblock/tests/common.c b/tools/testing/memblock/tests/common.c
>>> index 76a8ad818f3a..0ca26fe12c38 100644
>>> --- a/tools/testing/memblock/tests/common.c
>>> +++ b/tools/testing/memblock/tests/common.c
>>> @@ -60,16 +60,23 @@ void reset_memblock_attributes(void)
>>> memblock.current_limit = MEMBLOCK_ALLOC_ANYWHERE;
>>> }
>>> +void fill_memblock(void)
>>> +{
>>> + memset(memory_block.base, 1, MEM_SIZE);
>>> +}
>>> +
>>> void setup_memblock(void)
>>> {
>>> reset_memblock_regions();
>>> memblock_add((phys_addr_t)memory_block.base, MEM_SIZE);
>>> + fill_memblock();
>>> }
>>> void dummy_physical_memory_init(void)
>>> {
>>> memory_block.base = malloc(MEM_SIZE);
>>> assert(memory_block.base);
>>> + fill_memblock();
>>> }
>>> void dummy_physical_memory_cleanup(void)
>>> diff --git a/tools/testing/memblock/tests/common.h b/tools/testing/memblock/tests/common.h
>>> index d396e5423a8e..7a16a7dc8f2c 100644
>>> --- a/tools/testing/memblock/tests/common.h
>>> +++ b/tools/testing/memblock/tests/common.h
>>> @@ -51,6 +51,18 @@
>>> assert((_expected) < (_seen)); \
>>> } while (0)
>>> +/**
>>> + * ASSERT_MEM_EQ():
>>> + * Check that the first @_size bytes of @_seen are all equal to @_expected.
>>> + * If false, print failed test message (if running with --verbose) and then
>>> + * assert.
>>> + */
>>> +#define ASSERT_MEM_EQ(_seen, _expected, _size) do { \
>>> + for (int _i = 0; _i < (_size); _i++) { \
>>> + ASSERT_EQ((_seen)[_i], (_expected)); \
>>> + } \
>>> +} while (0)
>>> +
>>> #define PREFIX_PUSH() prefix_push(__func__)
>>> /*
>>> @@ -70,6 +82,7 @@ struct region {
>>> void reset_memblock_regions(void);
>>> void reset_memblock_attributes(void);
>>> +void fill_memblock(void);
>>> void setup_memblock(void);
>>> void dummy_physical_memory_init(void);
>>> void dummy_physical_memory_cleanup(void);
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