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mm/migrate: add migrate-shared test for migrate_vma_*()

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Add a migrate_vma_*() self test for mmap(MAP_SHARED) to verify that
!vma_anonymous() ranges won't be migrated.

Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: "Bharata B Rao" <bharata@linux.ibm.com>
Cc: Shuah Khan <shuah@kernel.org>
Link: http://lkml.kernel.org/r/20200710194840.7602-3-rcampbell@nvidia.com
Link: http://lkml.kernel.org/r/20200709165711.26584-3-rcampbell@nvidia.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ralph Campbell 2020-08-11 18:31:45 -07:00 committed by Linus Torvalds
parent 0744f2807a
commit b0fc0f3fca
1 changed files with 35 additions and 0 deletions
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35
tools/testing/selftests/vm/hmm-tests.c
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@ -941,6 +941,41 @@ TEST_F(hmm, migrate_fault)
hmm_buffer_free(buffer);
}
/*
* Migrate anonymous shared memory to device private memory.
*/
TEST_F(hmm, migrate_shared)
{
struct hmm_buffer *buffer;
unsigned long npages;
unsigned long size;
int ret;
npages = ALIGN(HMM_BUFFER_SIZE, self->page_size) >> self->page_shift;
ASSERT_NE(npages, 0);
size = npages << self->page_shift;
buffer = malloc(sizeof(*buffer));
ASSERT_NE(buffer, NULL);
buffer->fd = -1;
buffer->size = size;
buffer->mirror = malloc(size);
ASSERT_NE(buffer->mirror, NULL);
buffer->ptr = mmap(NULL, size,
PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS,
buffer->fd, 0);
ASSERT_NE(buffer->ptr, MAP_FAILED);
/* Migrate memory to device. */
ret = hmm_dmirror_cmd(self->fd, HMM_DMIRROR_MIGRATE, buffer, npages);
ASSERT_EQ(ret, -ENOENT);
hmm_buffer_free(buffer);
}
/*
* Try to migrate various memory types to device private memory.
*/