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KVM: selftests: Support multiple slots in dirty_log_perf_test

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Introduce a new option to dirty_log_perf_test: -x number_of_slots. This
causes the test to attempt to split the region of memory into the given
number of slots. If the region cannot be evenly divided, the test will
fail.

This allows testing with more than one slot and therefore measure how
performance scales with the number of memslots.

Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <20210804222844.1419481-8-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
David Matlack
2021-08-04 22:28:44 +00:00
committed by Paolo Bonzini
parent 93e083d4f4
commit 609e6202ea
6 changed files with 84 additions and 20 deletions
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20
tools/testing/selftests/kvm/lib/perf_test_util.c
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@@ -50,11 +50,12 @@ static void guest_code(uint32_t vcpu_id)
}
struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int vcpus,
uint64_t vcpu_memory_bytes,
uint64_t vcpu_memory_bytes, int slots,
enum vm_mem_backing_src_type backing_src)
{
struct kvm_vm *vm;
uint64_t guest_num_pages;
int i;
pr_info("Testing guest mode: %s\n", vm_guest_mode_string(mode));
@@ -68,6 +69,9 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int vcpus,
"Guest memory size is not host page size aligned.");
TEST_ASSERT(vcpu_memory_bytes % perf_test_args.guest_page_size == 0,
"Guest memory size is not guest page size aligned.");
TEST_ASSERT(guest_num_pages % slots == 0,
"Guest memory cannot be evenly divided into %d slots.",
slots);
vm = vm_create_with_vcpus(mode, vcpus, DEFAULT_GUEST_PHY_PAGES,
(vcpus * vcpu_memory_bytes) / perf_test_args.guest_page_size,
@@ -95,10 +99,16 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int vcpus,
#endif
pr_info("guest physical test memory offset: 0x%lx\n", guest_test_phys_mem);
/* Add an extra memory slot for testing */
vm_userspace_mem_region_add(vm, backing_src, guest_test_phys_mem,
PERF_TEST_MEM_SLOT_INDEX,
guest_num_pages, 0);
/* Add extra memory slots for testing */
for (i = 0; i < slots; i++) {
uint64_t region_pages = guest_num_pages / slots;
vm_paddr_t region_start = guest_test_phys_mem +
region_pages * perf_test_args.guest_page_size * i;
vm_userspace_mem_region_add(vm, backing_src, region_start,
PERF_TEST_MEM_SLOT_INDEX + i,
region_pages, 0);
}
/* Do mapping for the demand paging memory slot */
virt_map(vm, guest_test_virt_mem, guest_test_phys_mem, guest_num_pages);