Re: [PATCH 06/15] KVM: selftests: Use shorthand local var to access struct perf_tests_args
From: Ben Gardon <hidden>
Date: 2021-02-11 01:10:09
Also in:
lkml
On Wed, Feb 10, 2021 at 3:06 PM Sean Christopherson [off-list ref] wrote:
Use 'pta' as a local pointer to the global perf_tests_args in order to shorten line lengths and make the code borderline readable. No functional change intended. Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Ben Gardon <redacted>
quoted hunk ↗ jump to hunk
--- .../selftests/kvm/lib/perf_test_util.c | 36 ++++++++++--------- 1 file changed, 19 insertions(+), 17 deletions(-)diff --git a/tools/testing/selftests/kvm/lib/perf_test_util.c b/tools/testing/selftests/kvm/lib/perf_test_util.c index f187b86f2e14..73b0fccc28b9 100644 --- a/tools/testing/selftests/kvm/lib/perf_test_util.c +++ b/tools/testing/selftests/kvm/lib/perf_test_util.c@@ -23,7 +23,8 @@ static uint64_t guest_test_virt_mem = DEFAULT_GUEST_TEST_MEM; */ static void guest_code(uint32_t vcpu_id) { - struct perf_test_vcpu_args *vcpu_args = &perf_test_args.vcpu_args[vcpu_id]; + struct perf_test_args *pta = &perf_test_args; + struct perf_test_vcpu_args *vcpu_args = &pta->vcpu_args[vcpu_id]; uint64_t gva; uint64_t pages; int i;@@ -36,9 +37,9 @@ static void guest_code(uint32_t vcpu_id) while (true) { for (i = 0; i < pages; i++) { - uint64_t addr = gva + (i * perf_test_args.guest_page_size); + uint64_t addr = gva + (i * pta->guest_page_size); - if (i % perf_test_args.wr_fract == 0) + if (i % pta->wr_fract == 0) *(uint64_t *)addr = 0x0123456789ABCDEF; else READ_ONCE(*(uint64_t *)addr);@@ -52,32 +53,32 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int vcpus, uint64_t vcpu_memory_bytes, enum vm_mem_backing_src_type backing_src) { + struct perf_test_args *pta = &perf_test_args; struct kvm_vm *vm; uint64_t guest_num_pages; pr_info("Testing guest mode: %s\n", vm_guest_mode_string(mode)); - perf_test_args.host_page_size = getpagesize(); + pta->host_page_size = getpagesize(); /* * Snapshot the non-huge page size. This is used by the guest code to * access/dirty pages at the logging granularity. */ - perf_test_args.guest_page_size = vm_guest_mode_params[mode].page_size; + pta->guest_page_size = vm_guest_mode_params[mode].page_size; guest_num_pages = vm_adjust_num_guest_pages(mode, - (vcpus * vcpu_memory_bytes) / perf_test_args.guest_page_size); + (vcpus * vcpu_memory_bytes) / pta->guest_page_size); - TEST_ASSERT(vcpu_memory_bytes % perf_test_args.host_page_size == 0, + TEST_ASSERT(vcpu_memory_bytes % pta->host_page_size == 0, "Guest memory size is not host page size aligned."); - TEST_ASSERT(vcpu_memory_bytes % perf_test_args.guest_page_size == 0, + TEST_ASSERT(vcpu_memory_bytes % pta->guest_page_size == 0, "Guest memory size is not guest page size aligned."); vm = vm_create_with_vcpus(mode, vcpus, - (vcpus * vcpu_memory_bytes) / perf_test_args.guest_page_size, + (vcpus * vcpu_memory_bytes) / pta->guest_page_size, 0, guest_code, NULL); - - perf_test_args.vm = vm; + pta->vm = vm; /* * If there should be more memory in the guest test region than there@@ -90,8 +91,8 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int vcpus, vcpu_memory_bytes); guest_test_phys_mem = (vm_get_max_gfn(vm) - guest_num_pages) * - perf_test_args.guest_page_size; - guest_test_phys_mem &= ~(perf_test_args.host_page_size - 1); + pta->guest_page_size; + guest_test_phys_mem &= ~(pta->host_page_size - 1);
Not really germane to this patch, but the align macro could be used here as well.
quoted hunk ↗ jump to hunk
if (backing_src == VM_MEM_SRC_ANONYMOUS_THP || backing_src == VM_MEM_SRC_ANONYMOUS_HUGETLB) guest_test_phys_mem &= ~(KVM_UTIL_HUGEPAGE_ALIGNMENT - 1);@@ -125,30 +126,31 @@ void perf_test_setup_vcpus(struct kvm_vm *vm, int vcpus, uint64_t vcpu_memory_bytes, bool partition_vcpu_memory_access) { + struct perf_test_args *pta = &perf_test_args; vm_paddr_t vcpu_gpa; struct perf_test_vcpu_args *vcpu_args; int vcpu_id; for (vcpu_id = 0; vcpu_id < vcpus; vcpu_id++) { - vcpu_args = &perf_test_args.vcpu_args[vcpu_id]; + vcpu_args = &pta->vcpu_args[vcpu_id]; vcpu_args->vcpu_id = vcpu_id; if (partition_vcpu_memory_access) { vcpu_args->gva = guest_test_virt_mem + (vcpu_id * vcpu_memory_bytes); vcpu_args->pages = vcpu_memory_bytes / - perf_test_args.guest_page_size; + pta->guest_page_size; vcpu_gpa = guest_test_phys_mem + (vcpu_id * vcpu_memory_bytes); } else { vcpu_args->gva = guest_test_virt_mem; vcpu_args->pages = (vcpus * vcpu_memory_bytes) / - perf_test_args.guest_page_size; + pta->guest_page_size; vcpu_gpa = guest_test_phys_mem; } pr_debug("Added VCPU %d with test mem gpa [%lx, %lx)\n", vcpu_id, vcpu_gpa, vcpu_gpa + - (vcpu_args->pages * perf_test_args.guest_page_size)); + (vcpu_args->pages * pta->guest_page_size)); } } --2.30.0.478.g8a0d178c01-goog