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Date: Sat, 20 Aug 2022 01:40:26 -0700
From: Rebecca Mckeever <remckee0@...il.com>
To: "Huang, Shaoqin" <shaoqin.huang@...el.com>
Cc: Mike Rapoport <rppt@...nel.org>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH 8/8] memblock tests: add tests for memblock_trim_memory
On Tue, Aug 16, 2022 at 09:46:11AM +0800, Huang, Shaoqin wrote:
>
>
> On 8/14/2022 1:54 PM, Rebecca Mckeever wrote:
> > Add tests for memblock_trim_memory() for the following scenarios:
> > - all regions aligned
> > - one region unalign that is smaller than the alignment
> > - one region unaligned at the base
> > - one region unaligned at the end
> >
> > Signed-off-by: Rebecca Mckeever <remckee0@...il.com>
> > ---
> > tools/testing/memblock/tests/basic_api.c | 223 +++++++++++++++++++++++
> > 1 file changed, 223 insertions(+)
> >
> > diff --git a/tools/testing/memblock/tests/basic_api.c b/tools/testing/memblock/tests/basic_api.c
> > index d7f008e7a12a..c8bb44f20846 100644
> > --- a/tools/testing/memblock/tests/basic_api.c
> > +++ b/tools/testing/memblock/tests/basic_api.c
> > @@ -8,6 +8,7 @@
> > #define FUNC_RESERVE "memblock_reserve"
> > #define FUNC_REMOVE "memblock_remove"
> > #define FUNC_FREE "memblock_free"
> > +#define FUNC_TRIM "memblock_trim_memory"
> > static int memblock_initialization_check(void)
> > {
> > @@ -1723,6 +1724,227 @@ static int memblock_bottom_up_checks(void)
> > return 0;
> > }
> > +/*
> > + * A test that tries to trim memory when both ends of the memory region are
> > + * aligned. Expect that the memory will not be trimmed. Expect the counter to
> > + * not be updated.
> > + */
> > +static int memblock_trim_memory_aligned_check(void)
> > +{
> > + struct memblock_region *rgn;
> > + phys_addr_t alignment = SMP_CACHE_BYTES;
> > +
> > + rgn = &memblock.memory.regions[0];
> > +
> > + struct region r = {
> > + .base = alignment,
> > + .size = alignment * 4
> > + };
> > +
> > + PREFIX_PUSH();
> > +
> > + reset_memblock_regions();
> > + memblock_add(r.base, r.size);
> > + memblock_trim_memory(alignment);
> > +
> > + ASSERT_EQ(rgn->base, r.base);
> > + ASSERT_EQ(rgn->size, r.size);
> > +
> > + ASSERT_EQ(memblock.memory.cnt, 1);
> > +
> > + test_pass_pop();
> > +
> > + return 0;
> > +}
> > +
> > +/*
> > + * A test that tries to trim memory when there are two available regions, r1 and
> > + * r2. Region r1 is aligned on both ends and region r2 is unaligned on one end
> > + * and smaller than the alignment:
> > + *
> > + * alignment
> > + * |--------|
> > + * | +-----------------+ +------+ |
> > + * | | r1 | | r2 | |
> > + * +--------+-----------------+--------+------+---+
> > + * ^ ^ ^ ^ ^
> > + * |________|________|________| |
> > + * | Unaligned address
> > + * Aligned addresses
> > + *
> > + * Expect that r1 will not be trimmed and r2 will be removed. Expect the
> > + * counter to be updated.
> > + */
> > +static int memblock_trim_memory_too_small_check(void)
> > +{
> > + struct memblock_region *rgn;
> > + phys_addr_t alignment = SMP_CACHE_BYTES;
> > +
> > + rgn = &memblock.memory.regions[0];
> > +
> > + struct region r1 = {
> > + .base = alignment,
> > + .size = alignment * 2
> > + };
> > + struct region r2 = {
> > + .base = alignment * 4,
> > + .size = alignment - SZ_2
> > + };
> > +
> > + PREFIX_PUSH();
> > +
> > + reset_memblock_regions();
> > + memblock_add(r1.base, r1.size);
> > + memblock_add(r2.base, r2.size);
> > + memblock_trim_memory(alignment);
> > +
> > + ASSERT_EQ(rgn->base, r1.base);
> > + ASSERT_EQ(rgn->size, r1.size);
> > +
> > + ASSERT_EQ(memblock.memory.cnt, 1);
> > +
> > + test_pass_pop();
> > +
> > + return 0;
> > +}
> > +
> > +/*
> > + * A test that tries to trim memory when there are two available regions, r1 and
> > + * r2. Region r1 is aligned on both ends and region r2 is unaligned at the base
> > + * and aligned at the end:
> > + *
> > + * Unaligned address
> > + * |
> > + * v
> > + * | +-----------------+ +---------------+ |
> > + * | | r1 | | r2 | |
> > + * +--------+-----------------+----------+---------------+---+
> > + * ^ ^ ^ ^ ^ ^
> > + * |________|________|________|________|________|
> > + * |
> > + * Aligned addresses
> > + *
> > + * Expect that r1 will not be trimmed and r2 will be trimmed at the base.
> > + * Expect the counter to not be updated.
> > + */
> > +static int memblock_trim_memory_unaligned_base_check(void)
> > +{
> > + struct memblock_region *rgn1, *rgn2;
> > + phys_addr_t alignment = SMP_CACHE_BYTES;
> > + phys_addr_t offset = SZ_2;
> > + phys_addr_t r2_base, r2_size;
> > +
> > + rgn1 = &memblock.memory.regions[0];
> > + rgn2 = &memblock.memory.regions[1];
> > +
> > + struct region r1 = {
> > + .base = alignment,
> > + .size = alignment * 2
> > + };
> > + struct region r2 = {
> > + .base = alignment * 4 + offset,
> > + .size = alignment * 2 - offset
> > + };
> > +
> > + PREFIX_PUSH();
> > +
> > + r2_base = r2.base + (alignment - offset);
> > + r2_size = r2.size - (alignment - offset);
>
> Also the variable name.
>
> > +
> > + reset_memblock_regions();
> > + memblock_add(r1.base, r1.size);
> > + memblock_add(r2.base, r2.size);
> > + memblock_trim_memory(alignment);
> > +
> > + ASSERT_EQ(rgn1->base, r1.base);
> > + ASSERT_EQ(rgn1->size, r1.size);
> > +
> > + ASSERT_EQ(rgn2->base, r2_base);
> > + ASSERT_EQ(rgn2->size, r2_size);
> > +
> > + ASSERT_EQ(memblock.memory.cnt, 2);
> > +
> > + test_pass_pop();
> > +
> > + return 0;
> > +}
> > +
> > +/*
> > + * A test that tries to trim memory when there are two available regions, r1 and
> > + * r2. Region r1 is aligned on both ends and region r2 is aligned at the base
> > + * and unaligned at the end:
> > + *
> > + * Unaligned address
> > + * |
> > + * v
> > + * | +-----------------+ +---------------+ |
> > + * | | r1 | | r2 | |
> > + * +--------+-----------------+--------+---------------+---+
> > + * ^ ^ ^ ^ ^ ^
> > + * |________|________|________|________|________|
> > + * |
> > + * Aligned addresses
> > + *
> > + * Expect that r1 will not be trimmed and r2 will be trimmed at the base.
> ^
> at the end.
I forgot to make this change in v2. I will include it in v3.
> > + * Expect the counter to not be updated.
> > + */
> > +static int memblock_trim_memory_unaligned_end_check(void)
> > +{
> > + struct memblock_region *rgn1, *rgn2;
> > + phys_addr_t alignment = SMP_CACHE_BYTES;
> > + phys_addr_t offset = SZ_2;
> > + phys_addr_t r2_size;
> > +
> > + rgn1 = &memblock.memory.regions[0];
> > + rgn2 = &memblock.memory.regions[1];
> > +
> > + struct region r1 = {
> > + .base = alignment,
> > + .size = alignment * 2
> > + };
> > + struct region r2 = {
> > + .base = alignment * 4,
> > + .size = alignment * 2 - offset
> > + };
> > +
> > + PREFIX_PUSH();
> > +
> > + r2_size = r2.size - (alignment - offset);
> > +
> > + reset_memblock_regions();
> > + memblock_add(r1.base, r1.size);
> > + memblock_add(r2.base, r2.size);
> > + memblock_trim_memory(alignment);
> > +
> > + ASSERT_EQ(rgn1->base, r1.base);
> > + ASSERT_EQ(rgn1->size, r1.size);
> > +
> > + ASSERT_EQ(rgn2->base, r2.base);
> > + ASSERT_EQ(rgn2->size, r2_size);
> > +
> > + ASSERT_EQ(memblock.memory.cnt, 2);
> > +
> > + test_pass_pop();
> > +
> > + return 0;
> > +}
> > +
> > +static int memblock_trim_memory_checks(void)
> > +{
> > + prefix_reset();
> > + prefix_push(FUNC_TRIM);
> > + test_print("Running %s tests...\n", FUNC_TRIM);
> > +
> > + memblock_trim_memory_aligned_check();
> > + memblock_trim_memory_too_small_check();
> > + memblock_trim_memory_unaligned_base_check();
> > + memblock_trim_memory_unaligned_end_check();
> > +
> > + prefix_pop();
> > +
> > + return 0;
> > +}
> > +
> > int memblock_basic_checks(void)
> > {
> > memblock_initialization_check();
> > @@ -1731,6 +1953,7 @@ int memblock_basic_checks(void)
> > memblock_remove_checks();
> > memblock_free_checks();
> > memblock_bottom_up_checks();
> > + memblock_trim_memory_checks();
> > return 0;
> > }
>
> Others looks good.
Thanks,
Rebecca
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