From patchwork Fri Apr 21 16:52:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vipin Sharma X-Patchwork-Id: 13220404 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7F3A4C77B61 for ; Fri, 21 Apr 2023 16:54:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232837AbjDUQyw (ORCPT ); Fri, 21 Apr 2023 12:54:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34362 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233241AbjDUQyc (ORCPT ); Fri, 21 Apr 2023 12:54:32 -0400 Received: from mail-pg1-x549.google.com (mail-pg1-x549.google.com [IPv6:2607:f8b0:4864:20::549]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BF52C1562D for ; Fri, 21 Apr 2023 09:54:15 -0700 (PDT) Received: by mail-pg1-x549.google.com with SMTP id 41be03b00d2f7-5212ed3b16eso1493463a12.0 for ; Fri, 21 Apr 2023 09:54:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1682095991; x=1684687991; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=XgxikP+X3kYGOAuFnf+zh/dPS0rwAngpLKDcQUsUAcM=; b=zi2WcQ51MX/dRjCsXVVb2UKWOyQqYWvQb2rVS+55Q5JnG1KMg+BKMNc2m6CICefKnM sOoWMaaiusHacDgSsH1s32sSWTdgiP6wsllHt4URTvZ0ZcdB98xurTcCxqKUnxgdyzgm c4orxbQVHQYl0D2JZPa34BcJ9O4mJAskKn3jMGVJzfd6NUdjkgFcz0V7h9rDItezG/hK 7JYrpPZ3On/wItGK9UD3eRq1xE0xBjYT4fDySVm0kYqRmDOuZGjHmdOR2nk+iWWuGquk ltSMCNgY7ajHQwNBZQBzYSt6DngLePJXMrG1yPF8WE+pTN4Iej8hv/0YWshRY0JJCK2Q ghZg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682095991; x=1684687991; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=XgxikP+X3kYGOAuFnf+zh/dPS0rwAngpLKDcQUsUAcM=; b=QmhRnJ1mJZK0LzjyiMQCO8FML+nZS0FkavPyHbaKhNyWYAl1X88Tn8aoV4inMMZx4d lLGL8RQcidpl5RZW2Pxwd/OGOwIfb34ul9zJzryh652yBUwtdl96uqMHcrAsBOXqow30 5PM60uu5BxqIVbdhmAV3mHcndmDQrFwGgTV9csRoVrgn6Q0y5FN9t1tZpmm/gf1Bdhqw hfr1H3hGzsh62BNwPgMnNG9qnxiYvJfUKJEBbwHl/oPNFdGig+wbP0Ik0y0k8CSLvxLJ cn5NGuwBdVj9i+QAC9/dSBOdBB/8zxp7LmBjrP6iEG+ysnTXASw4NchyuzXkUT3vqKth vFUA== X-Gm-Message-State: AAQBX9f41UjwccdHF4+O3iclfP4Q/ocDbAh5k+6adcMLr65fOA4QrKEK TyFOZOqlpkznzTlJ9kB7JJUUlKnnxW+n X-Google-Smtp-Source: AKy350bLqvmQkloLHtSlULbO+KpqiU67EC/akbM+X8VT7JeFOolfsbExNw2my01sT0w0GqSqV5g1UxiZlB+p X-Received: from vipin.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:479f]) (user=vipinsh job=sendgmr) by 2002:a63:f54b:0:b0:520:e728:8894 with SMTP id e11-20020a63f54b000000b00520e7288894mr1352406pgk.5.1682095990900; Fri, 21 Apr 2023 09:53:10 -0700 (PDT) Date: Fri, 21 Apr 2023 09:52:57 -0700 In-Reply-To: <20230421165305.804301-1-vipinsh@google.com> Mime-Version: 1.0 References: <20230421165305.804301-1-vipinsh@google.com> X-Mailer: git-send-email 2.40.0.634.g4ca3ef3211-goog Message-ID: <20230421165305.804301-2-vipinsh@google.com> Subject: [PATCH 1/9] KVM: selftests: Allow dirty_log_perf_test to clear dirty memory in chunks From: Vipin Sharma To: maz@kernel.org, oliver.upton@linux.dev, james.morse@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, chenhuacai@kernel.org, aleksandar.qemu.devel@gmail.com, tsbogend@alpha.franken.de, anup@brainfault.org, atishp@atishpatra.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, seanjc@google.com, pbonzini@redhat.com, dmatlack@google.com, ricarkol@google.com Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-mips@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kselftest@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Vipin Sharma Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org In dirty_log_perf_test, provide option 'k' to specify the size of the chunks and clear dirty memory in chunks in each iteration. If this option is not provided then fallback to old way of clearing whole memslot in one call per iteration. In production environment whole memslot is rarely cleared in a single call, instead clearing operation is split across multiple calls to reduce time between clearing and sending memory to a remote host. This change mimics the production usecases and allow to get metrics based on that. Signed-off-by: Vipin Sharma --- .../selftests/kvm/dirty_log_perf_test.c | 19 ++++++++++++--- .../testing/selftests/kvm/include/memstress.h | 12 ++++++++-- tools/testing/selftests/kvm/lib/memstress.c | 24 ++++++++++++++----- 3 files changed, 44 insertions(+), 11 deletions(-) diff --git a/tools/testing/selftests/kvm/dirty_log_perf_test.c b/tools/testing/selftests/kvm/dirty_log_perf_test.c index 416719e20518..0852a7ba42e1 100644 --- a/tools/testing/selftests/kvm/dirty_log_perf_test.c +++ b/tools/testing/selftests/kvm/dirty_log_perf_test.c @@ -134,6 +134,7 @@ struct test_params { uint32_t write_percent; uint32_t random_seed; bool random_access; + uint64_t clear_chunk_size; }; static void run_test(enum vm_guest_mode mode, void *arg) @@ -144,6 +145,7 @@ static void run_test(enum vm_guest_mode mode, void *arg) uint64_t guest_num_pages; uint64_t host_num_pages; uint64_t pages_per_slot; + uint64_t pages_per_clear; struct timespec start; struct timespec ts_diff; struct timespec get_dirty_log_total = (struct timespec){0}; @@ -164,6 +166,7 @@ static void run_test(enum vm_guest_mode mode, void *arg) guest_num_pages = vm_adjust_num_guest_pages(mode, guest_num_pages); host_num_pages = vm_num_host_pages(mode, guest_num_pages); pages_per_slot = host_num_pages / p->slots; + pages_per_clear = p->clear_chunk_size / getpagesize(); bitmaps = memstress_alloc_bitmaps(p->slots, pages_per_slot); @@ -244,8 +247,9 @@ static void run_test(enum vm_guest_mode mode, void *arg) if (dirty_log_manual_caps) { clock_gettime(CLOCK_MONOTONIC, &start); - memstress_clear_dirty_log(vm, bitmaps, p->slots, - pages_per_slot); + memstress_clear_dirty_log_in_chunks(vm, bitmaps, p->slots, + pages_per_slot, + pages_per_clear); ts_diff = timespec_elapsed(start); clear_dirty_log_total = timespec_add(clear_dirty_log_total, ts_diff); @@ -343,6 +347,11 @@ static void help(char *name) " To leave the application task unpinned, drop the final entry:\n\n" " ./dirty_log_perf_test -v 3 -c 22,23,24\n\n" " (default: no pinning)\n"); + printf(" -k: Specify the chunk size in which dirty memory gets cleared\n" + " in memslots in each iteration. If the size is bigger than\n" + " the memslot size then whole memslot is cleared in one call.\n" + " Size must be aligned to the host page size. e.g. 10M or 3G\n" + " (default: UINT64_MAX, clears whole memslot in one call)\n"); puts(""); exit(0); } @@ -358,6 +367,7 @@ int main(int argc, char *argv[]) .slots = 1, .random_seed = 1, .write_percent = 100, + .clear_chunk_size = UINT64_MAX, }; int opt; @@ -368,7 +378,7 @@ int main(int argc, char *argv[]) guest_modes_append_default(); - while ((opt = getopt(argc, argv, "ab:c:eghi:m:nop:r:s:v:x:w:")) != -1) { + while ((opt = getopt(argc, argv, "ab:c:eghi:k:m:nop:r:s:v:x:w:")) != -1) { switch (opt) { case 'a': p.random_access = true; @@ -392,6 +402,9 @@ int main(int argc, char *argv[]) case 'i': p.iterations = atoi_positive("Number of iterations", optarg); break; + case 'k': + p.clear_chunk_size = parse_size(optarg); + break; case 'm': guest_modes_cmdline(optarg); break; diff --git a/tools/testing/selftests/kvm/include/memstress.h b/tools/testing/selftests/kvm/include/memstress.h index ce4e603050ea..2acc93f76fc3 100644 --- a/tools/testing/selftests/kvm/include/memstress.h +++ b/tools/testing/selftests/kvm/include/memstress.h @@ -75,8 +75,16 @@ void memstress_setup_nested(struct kvm_vm *vm, int nr_vcpus, struct kvm_vcpu *vc void memstress_enable_dirty_logging(struct kvm_vm *vm, int slots); void memstress_disable_dirty_logging(struct kvm_vm *vm, int slots); void memstress_get_dirty_log(struct kvm_vm *vm, unsigned long *bitmaps[], int slots); -void memstress_clear_dirty_log(struct kvm_vm *vm, unsigned long *bitmaps[], - int slots, uint64_t pages_per_slot); +void memstress_clear_dirty_log_in_chunks(struct kvm_vm *vm, + unsigned long *bitmaps[], int slots, + uint64_t pages_per_slot, + uint64_t pages_per_clear); +static inline void memstress_clear_dirty_log(struct kvm_vm *vm, + unsigned long *bitmaps[], int slots, + uint64_t pages_per_slot) { + memstress_clear_dirty_log_in_chunks(vm, bitmaps, slots, pages_per_slot, + pages_per_slot); +} unsigned long **memstress_alloc_bitmaps(int slots, uint64_t pages_per_slot); void memstress_free_bitmaps(unsigned long *bitmaps[], int slots); diff --git a/tools/testing/selftests/kvm/lib/memstress.c b/tools/testing/selftests/kvm/lib/memstress.c index 3632956c6bcf..e0c701ab4e9a 100644 --- a/tools/testing/selftests/kvm/lib/memstress.c +++ b/tools/testing/selftests/kvm/lib/memstress.c @@ -355,16 +355,28 @@ void memstress_get_dirty_log(struct kvm_vm *vm, unsigned long *bitmaps[], int sl } } -void memstress_clear_dirty_log(struct kvm_vm *vm, unsigned long *bitmaps[], - int slots, uint64_t pages_per_slot) +void memstress_clear_dirty_log_in_chunks(struct kvm_vm *vm, + unsigned long *bitmaps[], int slots, + uint64_t pages_per_slot, + uint64_t pages_per_clear) { - int i; + int i, slot; + uint64_t from, clear_pages_count; for (i = 0; i < slots; i++) { - int slot = MEMSTRESS_MEM_SLOT_INDEX + i; - - kvm_vm_clear_dirty_log(vm, slot, bitmaps[i], 0, pages_per_slot); + slot = MEMSTRESS_MEM_SLOT_INDEX + i; + from = 0; + clear_pages_count = pages_per_clear; + + while (from < pages_per_slot) { + if (from + clear_pages_count > pages_per_slot) + clear_pages_count = pages_per_slot - from; + kvm_vm_clear_dirty_log(vm, slot, bitmaps[i], from, + clear_pages_count); + from += clear_pages_count; + } } + } unsigned long **memstress_alloc_bitmaps(int slots, uint64_t pages_per_slot)