From patchwork Fri Jun 2 16:08:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vipin Sharma X-Patchwork-Id: 13265567 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 A4657C7EE24 for ; Fri, 2 Jun 2023 16:09:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235952AbjFBQJZ (ORCPT ); Fri, 2 Jun 2023 12:09:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34874 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236487AbjFBQJX (ORCPT ); Fri, 2 Jun 2023 12:09:23 -0400 Received: from mail-pf1-x44a.google.com (mail-pf1-x44a.google.com [IPv6:2607:f8b0:4864:20::44a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 44CA81BC for ; Fri, 2 Jun 2023 09:09:22 -0700 (PDT) Received: by mail-pf1-x44a.google.com with SMTP id d2e1a72fcca58-65356ed7053so604755b3a.2 for ; Fri, 02 Jun 2023 09:09:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1685722162; x=1688314162; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=DpCi+Z+5IrlXYT4x1uPx6ey3Kh6k4RwU4EEsfyAeFCY=; b=HfcMR6iJ3p+XpoWwwGnuCf8DXEruqodHMrgo0qRUl9XKRxAQVZGiN8TxS7KXZ6liYk IHfRjrAnrHvGlvRXdd0vMGLUxjqvqzDBCEZqkZ+AlgA2D+HqWzekq3osmRA2k0du5O5o kCcbGty+UgEm8rxi/OLq7qgVCFwHH13HTXpftBj1XaM0i7tjBO9lKRJTdTnJF5R/3t6c JrkS5ti9XRCTfaa1D8P3ktMUx2ASyp8GqB5XYe9RG7pBvxny7Wq3BWLQtvGrXB/UToqw xyXoWdXWsB9HM0UfeGzOOvYeGlmazG1w/VKQFNAblPuwmKiFaBvQdPac1I4EbR7ShaXp NDtQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1685722162; x=1688314162; 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=DpCi+Z+5IrlXYT4x1uPx6ey3Kh6k4RwU4EEsfyAeFCY=; b=M/4yvPeYl5dKM4kgDr7APK8GGZtWqFor6edWp1+xLF60/3cO/hok3Kgjm0Orn6lOfa hva2VVYMVKOaov7rRFjOlAg7X17jEwEhspFv5ASy2wSSxAeSSIZKwZzLhmn3HaZwX2vx UoO9rfet056ra4xHZDAsEMtB+G+nXP74rlxPMhhREWM71JvYUQ92pvQzchLaOpDt3KSE XdcQEBMbjIp8IGKIiWT2uvAcWvuBYk09X1YaXjV7eY8LV17P8MgBsquV2lJXeBi199qo kcSOB0lMhdtTthYb8IMRAUAj+oxgXlZMPX9h8c4R4IuRGJG4vH5/wHvoHc6sZNyDCdkX 8CEA== X-Gm-Message-State: AC+VfDyVfkzHjvtwAkatM2oX1lv4oWJ4zG7sC4xyMHfuG+0M2Nvzsw2q 6P9vzOzzFpfXeU7sYiOR4cUoCzNhOsoJ X-Google-Smtp-Source: ACHHUZ7r4si2IcQKI55bOSM8SHxJbAhndrnIqDFmjr9vqnHPxyaBa77OMmwMCW0FKU1TUemviXs4kKMtvfhR X-Received: from vipin.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:479f]) (user=vipinsh job=sendgmr) by 2002:a05:6a00:2183:b0:643:a542:b311 with SMTP id h3-20020a056a00218300b00643a542b311mr4840248pfi.0.1685722161708; Fri, 02 Jun 2023 09:09:21 -0700 (PDT) Date: Fri, 2 Jun 2023 09:08:59 -0700 In-Reply-To: <20230602160914.4011728-1-vipinsh@google.com> Mime-Version: 1.0 References: <20230602160914.4011728-1-vipinsh@google.com> X-Mailer: git-send-email 2.41.0.rc0.172.g3f132b7071-goog Message-ID: <20230602160914.4011728-2-vipinsh@google.com> Subject: [PATCH v2 01/16] KVM: selftests: Clear dirty logs in user defined chunks sizes in dirty_log_perf_test 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-kselftest@vger.kernel.org In dirty_log_perf_test, provide a new option 'k' to specify the size of the chunks and clear dirty memory in chunks in each iteration. If option is not provided then fallback to the old way of clearing whole memslot in one call in each 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 allows to get performance numbers based on that. Signed-off-by: Vipin Sharma --- .../selftests/kvm/dirty_log_perf_test.c | 42 +++++++++++++++---- 1 file changed, 34 insertions(+), 8 deletions(-) diff --git a/tools/testing/selftests/kvm/dirty_log_perf_test.c b/tools/testing/selftests/kvm/dirty_log_perf_test.c index e9d6d1aecf89..119ddfc7306e 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 toggle_dirty_logging(struct kvm_vm *vm, int slots, bool enable) @@ -169,16 +170,28 @@ static void get_dirty_log(struct kvm_vm *vm, unsigned long *bitmaps[], int slots } } -static void clear_dirty_log(struct kvm_vm *vm, unsigned long *bitmaps[], - int slots, uint64_t pages_per_slot) +static void 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; + uint64_t from, clear_pages_count; + int i, slot; 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; + } } + } static unsigned long **alloc_bitmaps(int slots, uint64_t pages_per_slot) @@ -215,6 +228,7 @@ 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}; @@ -235,6 +249,7 @@ 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 = alloc_bitmaps(p->slots, pages_per_slot); @@ -315,7 +330,9 @@ static void run_test(enum vm_guest_mode mode, void *arg) if (dirty_log_manual_caps) { clock_gettime(CLOCK_MONOTONIC, &start); - clear_dirty_log(vm, bitmaps, p->slots, pages_per_slot); + 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); @@ -413,6 +430,11 @@ 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); } @@ -428,6 +450,7 @@ int main(int argc, char *argv[]) .slots = 1, .random_seed = 1, .write_percent = 100, + .clear_chunk_size = UINT64_MAX, }; int opt; @@ -438,7 +461,7 @@ 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; @@ -462,6 +485,9 @@ 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;