From patchwork Fri Jun 2 16:09:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vipin Sharma X-Patchwork-Id: 13265608 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 4630DC7EE24 for ; Fri, 2 Jun 2023 16:10:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236656AbjFBQKA (ORCPT ); Fri, 2 Jun 2023 12:10:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35042 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235957AbjFBQJm (ORCPT ); Fri, 2 Jun 2023 12:09:42 -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 50332E51 for ; Fri, 2 Jun 2023 09:09:30 -0700 (PDT) Received: by mail-pg1-x549.google.com with SMTP id 41be03b00d2f7-517bad1b8c5so2085632a12.0 for ; Fri, 02 Jun 2023 09:09:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1685722169; x=1688314169; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=TCZIk7VgxCOZOGj9BrulapCebBiXjQ5+VJfBT1Ieq9g=; b=48Jv9Ndg6W2FWtv0TNF+EvHQkuzevnf0de3wNHQhiINnd1y+TJ3ZHZNsYvgiBjl6lh 9WUrwiuBOv0A4GYPSawEV6yVx5LbPQL0U+gQGnFWAFVUnyrF1z1qm1xlbl6HRjy6NNwE 8XB2SVK1dbUaEeLrM/H8JHaqBSIup+A6xNFpzpaufkcVOP+VAaTUukUdmKNrTQcISuZt yTtWhk1kuZr3BXzyN9NP6mKp7IAXkKM1nK9WQaTXO/PtqFm7I9EIaNt4fcwETtWcECAj 9ktEJ+8oLB8jJgpGPXgzImfVTKXWHcOIgbQS6xiesRZonieLTn89FjSta0ZVX6QUoqee mZLw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1685722169; x=1688314169; 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=TCZIk7VgxCOZOGj9BrulapCebBiXjQ5+VJfBT1Ieq9g=; b=Vo8vJ6znuTdZK5782taSyu3TawwJ/CB06HtLaLVrCRGaLT7KKIJOhzwKQmXwNL6ukw a2aNDogk7kGJJgQfVqIou4f0j71flpMyMHalnsBVxqVmWJ7rdmdrT+I6Ae2Up3yLKzKo 3VcdYGzgCJBWQGjTicQRQ0XJ8zUwOg37VgVqrLBiQt6ChxPYr6Qqk5aMpm8IHZO4JTVg 8ksqXoJlHc61PFTBTUbGczPkedk9+bxX/YwA+Wk/FRlAQc7tLjBd5Vb09ryH/Ca4M889 TUPuBLPzS4wcwgQN9zMNfdtssV2ATTpHYnnuIFXknYn78axtpqbn2CyWnN/YyK9XEUps YyuQ== X-Gm-Message-State: AC+VfDwsk6xEyzYTemQ54Mz5EQYXLHfwTjnjGQEnPW4OSw82Tc3Zlckk 0UDcnGrU44KkWgEqabb5JWnEBRLA2+QM X-Google-Smtp-Source: ACHHUZ5eYF/RV9lQrAgLH67VBGXqFnNNXk0G34PjM3lxGa6/KnJxp9P54a/FAO5X5SRVmoZXvlFdh+lSImCS X-Received: from vipin.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:479f]) (user=vipinsh job=sendgmr) by 2002:a63:d044:0:b0:53f:32cf:bcd1 with SMTP id s4-20020a63d044000000b0053f32cfbcd1mr2492124pgi.5.1685722169678; Fri, 02 Jun 2023 09:09:29 -0700 (PDT) Date: Fri, 2 Jun 2023 09:09:03 -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: <20230602160914.4011728-6-vipinsh@google.com> Subject: [PATCH v2 05/16] 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: kvm@vger.kernel.org Give users command line option (-j) to execute vCPUs independently of dirty log iterations after initialization is complete. This change makes dirty_log_perf_test behave like real world workflows where guest vCPUs keep on executing while VMM collects and clear 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 | 64 +++++++++++++------ 1 file changed, 44 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 14b012a0dcb1..fbf973d6cc66 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) && !READ_ONCE(host_quit)) + ; + } } avg = timespec_div(total, vcpu_last_completed_iteration[vcpu_idx]); @@ -332,18 +343,20 @@ 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); get_dirty_log(vm, bitmaps, p->slots); ts_diff = timespec_elapsed(start); @@ -365,6 +378,10 @@ static void run_test(enum vm_guest_mode mode, void *arg) } } + /* Block further vCPUs execution */ + if (!lockstep_iterations) + WRITE_ONCE(iteration, 0); + /* * Run vCPUs while dirty logging is being disabled to stress disabling * in terms of both performance and correctness. Opt-in via command @@ -458,6 +475,10 @@ 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 each iteration.\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" @@ -492,10 +513,10 @@ 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; @@ -519,6 +540,9 @@ 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;