From patchwork Fri Apr 21 16:53:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vipin Sharma X-Patchwork-Id: 13220446 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 DDC4DC7618E for ; Fri, 21 Apr 2023 17:06:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229962AbjDURGO (ORCPT ); Fri, 21 Apr 2023 13:06:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48876 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231128AbjDURGM (ORCPT ); Fri, 21 Apr 2023 13:06:12 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CDF36146F9 for ; Fri, 21 Apr 2023 10:05:37 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id 3f1490d57ef6-b922aa3725fso3306688276.0 for ; Fri, 21 Apr 2023 10:05:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1682096733; x=1684688733; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=aIXwJZ86g2cMsPal848/IoLZKDxpkMIUoWM/xoiNZjQ=; b=V3eWfqEayp3HeIsR3YCfbZV+VBWcnNHUJWauoM2SeOnOQAcHlZoFZUFwa2go5/Tn+G 1U3WDDAofvObPtXljsGuEE3dRw4IuoMZnHIZtE+IpuqNdKM7j0yDKo2KwPWZR1dxhWnn lw0EVHfzKFiGm2ZRYK/9IAwStl1twoNQNS563EEValHe6+Gcd1HIOrgX9E0TIkgTMwOB TwRUzcwGDqKAcItNGJPD+6FsYZSM4darknqL2HD8D8T/wBJX9hjsqCGmBEPEOuyVKlJo tillFkq6cGoRj+M41Bdt+TS+RfXh8hcyMyQsaE1cNC3OwoUbZugyOWnAV4ueSgIYYvmr 1rHQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682096733; x=1684688733; 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=aIXwJZ86g2cMsPal848/IoLZKDxpkMIUoWM/xoiNZjQ=; b=M7ZAsgo6xo7N+VbZpTyF18mBi61ANOsQu+0i9RJxnqkKyhW/8N2nKIoKhyPwIBYIkV YWeB+/z2z2em2BUIwt3HjBU1pkGCTVsWv6TYtKYRGsA94Xco8cRBpEVgnPZxeMP7ZyJK dgyuVwQheqmb3eOKlolrX/6iCu4HlSYYlIv71YOjZtDxNUe6f3BgqU4Qr4ghWnNl7Phn VPHzmvUmn8KsCoOQ1fquo2//9YjNl/DoC3jvFY4zwWrC1dmc/tpr/KPm3SfgwfyrrRV/ FJlkrpM140BWnRcbJmZ/bZpaBg/v3ns0Fwx/QrqAhyIJVYALeuU1+XO/njMw0fzW+gOf WTpQ== X-Gm-Message-State: AAQBX9ePhDeGI1IyUFIlSBe+MqDlppwh87vLx1KkfE5Qmv2YBeP7LE8B 4gK4ykwZ5NSIX2OpZz0AmS+xrzd6IQpx X-Google-Smtp-Source: AKy350bXgyJDTEgckFAM/H87961TV8R1B/izBkH2FZgQ+FxNt6ajRDFj7SNSbgxdm0eZ4bQuJyBfwm/9rS7m X-Received: from vipin.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:479f]) (user=vipinsh job=sendgmr) by 2002:a25:d147:0:b0:b8c:ad5:6b4e with SMTP id i68-20020a25d147000000b00b8c0ad56b4emr1983907ybg.12.1682095998019; Fri, 21 Apr 2023 09:53:18 -0700 (PDT) Date: Fri, 21 Apr 2023 09:53:01 -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: <20230421165305.804301-6-vipinsh@google.com> Subject: [PATCH 5/9] KVM: selftests: Allow independent execution of vCPUs 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-mips@vger.kernel.org Allow vCPUs to execute independent of dirty log iterations after initialization is complete. Hide this feature behind the new option "-j". This change makes dirty_log_perf_test execute like real world workflows where guest vCPUs keep on executing while VMM collects dirty logs. Total pages touched during execution of test will give good estimate of how vCPUs are performing while dirty logging is enabled. Signed-off-by: Vipin Sharma --- .../selftests/kvm/dirty_log_perf_test.c | 60 ++++++++++++------- 1 file changed, 40 insertions(+), 20 deletions(-) diff --git a/tools/testing/selftests/kvm/dirty_log_perf_test.c b/tools/testing/selftests/kvm/dirty_log_perf_test.c index 0a08a3d21123..ffdad535fdaa 100644 --- a/tools/testing/selftests/kvm/dirty_log_perf_test.c +++ b/tools/testing/selftests/kvm/dirty_log_perf_test.c @@ -69,6 +69,7 @@ static int iteration; static int vcpu_last_completed_iteration[KVM_MAX_VCPUS]; static atomic_ullong total_reads; static atomic_ullong total_writes; +static bool lockstep_iterations; static void vcpu_worker(struct memstress_vcpu_args *vcpu_args) { @@ -83,12 +84,16 @@ static void vcpu_worker(struct memstress_vcpu_args *vcpu_args) struct timespec total = (struct timespec){0}; struct timespec avg; struct ucall uc = {}; + int current_iteration = -1; int ret; run = vcpu->run; while (!READ_ONCE(host_quit)) { - int current_iteration = READ_ONCE(iteration); + if (lockstep_iterations) + current_iteration = READ_ONCE(iteration); + else + current_iteration++; clock_gettime(CLOCK_MONOTONIC, &start); ret = _vcpu_run(vcpu); @@ -118,13 +123,19 @@ static void vcpu_worker(struct memstress_vcpu_args *vcpu_args) ts_diff.tv_nsec); } - /* - * Keep running the guest while dirty logging is being disabled - * (iteration is negative) so that vCPUs are accessing memory - * for the entire duration of zapping collapsible SPTEs. - */ - while (current_iteration == READ_ONCE(iteration) && - READ_ONCE(iteration) >= 0 && !READ_ONCE(host_quit)) {} + if (lockstep_iterations) { + /* + * Keep running the guest while dirty logging is being disabled + * (iteration is negative) so that vCPUs are accessing memory + * for the entire duration of zapping collapsible SPTEs. + */ + while (current_iteration == READ_ONCE(iteration) && + READ_ONCE(iteration) >= 0 && !READ_ONCE(host_quit)) + ; + } else { + while (!READ_ONCE(iteration)) + ; + } } avg = timespec_div(total, vcpu_last_completed_iteration[vcpu_idx]); @@ -238,17 +249,19 @@ static void run_test(enum vm_guest_mode mode, void *arg) clock_gettime(CLOCK_MONOTONIC, &start); iteration++; - pr_debug("Starting iteration %d\n", iteration); - for (i = 0; i < nr_vcpus; i++) { - while (READ_ONCE(vcpu_last_completed_iteration[i]) - != iteration) - ; - } + if (lockstep_iterations) { + pr_debug("Starting iteration %d\n", iteration); + for (i = 0; i < nr_vcpus; i++) { + while (READ_ONCE(vcpu_last_completed_iteration[i]) + != iteration) + ; + } - ts_diff = timespec_elapsed(start); - vcpu_dirty_total = timespec_add(vcpu_dirty_total, ts_diff); - pr_info("Iteration %d dirty memory time: %ld.%.9lds\n", - iteration, ts_diff.tv_sec, ts_diff.tv_nsec); + ts_diff = timespec_elapsed(start); + vcpu_dirty_total = timespec_add(vcpu_dirty_total, ts_diff); + pr_info("Iteration %d dirty memory time: %ld.%.9lds\n", + iteration, ts_diff.tv_sec, ts_diff.tv_nsec); + } clock_gettime(CLOCK_MONOTONIC, &start); memstress_get_dirty_log(vm, bitmaps, p->slots); @@ -365,6 +378,10 @@ 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(" -j: Execute vCPUs independent of dirty log iterations\n" + " Independent vCPUs execution will allow them to continuously\n" + " dirty memory while main thread is collecting and clearing\n" + " dirty logs in the main thread's iterations.\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" @@ -399,10 +416,10 @@ int main(int argc, char *argv[]) kvm_check_cap(KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2); dirty_log_manual_caps &= (KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE | KVM_DIRTY_LOG_INITIALLY_SET); - + lockstep_iterations = true; guest_modes_append_default(); - while ((opt = getopt(argc, argv, "ab:c:eghi:k:l:m:nop:r:s:v:x:w:")) != -1) { + while ((opt = getopt(argc, argv, "ab:c:eghi:jk:l:m:nop:r:s:v:x:w:")) != -1) { switch (opt) { case 'a': p.random_access = true; @@ -426,6 +443,9 @@ int main(int argc, char *argv[]) case 'i': p.iterations = atoi_positive("Number of iterations", optarg); break; + case 'j': + lockstep_iterations = false; + break; case 'k': p.clear_chunk_size = parse_size(optarg); break;