From: Ralph Campbell <rcampbell@nvidia.com>
To: <linux-mm@kvack.org>, <kvm-ppc@vger.kernel.org>,
<linux-kselftest@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Cc: Jerome Glisse <jglisse@redhat.com>,
John Hubbard <jhubbard@nvidia.com>,
Christoph Hellwig <hch@lst.de>,
Jason Gunthorpe <jgg@mellanox.com>,
"Bharata B Rao" <bharata@linux.ibm.com>,
Shuah Khan <shuah@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Ralph Campbell <rcampbell@nvidia.com>
Subject: [PATCH v2 2/2] mm/migrate: add migrate-shared test for migrate_vma_*()
Date: Fri, 10 Jul 2020 12:48:40 -0700 [thread overview]
Message-ID: <20200710194840.7602-3-rcampbell@nvidia.com> (raw)
In-Reply-To: <20200710194840.7602-1-rcampbell@nvidia.com>
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>
---
tools/testing/selftests/vm/hmm-tests.c | 35 ++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/tools/testing/selftests/vm/hmm-tests.c b/tools/testing/selftests/vm/hmm-tests.c
index 79db22604019..e83d3ab37697 100644
--- a/tools/testing/selftests/vm/hmm-tests.c
+++ b/tools/testing/selftests/vm/hmm-tests.c
@@ -931,6 +931,41 @@ 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.
*/
--
2.20.1
prev parent reply other threads:[~2020-07-10 19:49 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-10 19:48 [PATCH v2 0/2] mm/migrate: optimize migrate_vma_setup() for holes Ralph Campbell
2020-07-10 19:48 ` [PATCH v2 1/2] " Ralph Campbell
2020-07-10 19:48 ` Ralph Campbell [this message]
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