From mboxrd@z Thu Jan 1 00:00:00 1970 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 0B46FC433F5 for ; Thu, 26 May 2022 17:55:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348404AbiEZRzT (ORCPT ); Thu, 26 May 2022 13:55:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51170 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240286AbiEZRyp (ORCPT ); Thu, 26 May 2022 13:54:45 -0400 Received: from mail-pf1-x449.google.com (mail-pf1-x449.google.com [IPv6:2607:f8b0:4864:20::449]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 71F98C03BB for ; Thu, 26 May 2022 10:54:30 -0700 (PDT) Received: by mail-pf1-x449.google.com with SMTP id z186-20020a6233c3000000b00510a6bc2864so1309565pfz.10 for ; Thu, 26 May 2022 10:54:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=FRI3yOd2jBqllb9cCkfyWs3M3poFKw/VaB/vECthXc0=; b=qaLYC8O0iC/49VvNbNC4/d+/0PPNhyiS1NmDCxgYJI6YRSk4bOI/2G1qfmi5uArvAr +ihmPwxft3+Xie9rw/VuqSYu1q+T7tg4iaOwyNwsEYOG7Y5ckgHyhSLDjMC7dvl4H0Sa 3UDvXdYrW1B2M3pqqDVFxus5CHojluv1mp8W6eVqHHIX/XI1Xejr4k6xpx1hKYpyjTzh q8fV6/jUKCI/EEG/JaukT2qQDAMPhS87QdMSAfoaDLGOe1zNnKoulrhr3ybYJ7d4NbGd 5th9CjEyr4mSvsn/ncspBqPm7JyDzgZfS0wmfaioWvJ4HZIUe27gUvYj2ytH3T2aa8I/ GQmw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=FRI3yOd2jBqllb9cCkfyWs3M3poFKw/VaB/vECthXc0=; b=PqKJnaKH2FKqFZDBXm9udohwJEXAMlIZryKeHgbpkEYjXkeNdm4U0alXbgRK8HXJFD yf2xMUtoTiCx7VFKO6EKddilZ37G2QH7DqZ/NA04l5ehWGA8Offkj2YyNDBqDfdGfWlx zRZTUwVQar99Xbh0J5VVCnsBKDqw5VCPo1cJv9V6VYnvIHRbSkfvSmGmsdHxMJY9p5zK GjCumhfnkR7DjlrLr7HprUrz4d1PiPYOhLn2ir22Ur23+UEDphiCtubNmx/Oo9Wn7HY8 jj6nm9IMrDyRGXeF17m2BUsgfOalNMD499EkL4F8/dkX3tex1GwAwoMawqcXtnEmtECy Hgog== X-Gm-Message-State: AOAM532lID3w/ZRSsIUB31ElSx3rH6wkSlHZEF8dEr7hcZMDKThImgBq Um1tS4WZo0EQQnos3qau92j32xVcDm4D X-Google-Smtp-Source: ABdhPJwiQksr/pw7CYHck0RR+tFA/cI985RJqtaX3uK/hhC4hDNVaZ2egzRl+njfFBnFaWvq9tHOXyPjVXcH X-Received: from sweer.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:e45]) (user=bgardon job=sendgmr) by 2002:a17:90b:1192:b0:1e0:63f3:c463 with SMTP id gk18-20020a17090b119200b001e063f3c463mr184161pjb.1.1653587669619; Thu, 26 May 2022 10:54:29 -0700 (PDT) Date: Thu, 26 May 2022 17:54:08 +0000 In-Reply-To: <20220526175408.399718-1-bgardon@google.com> Message-Id: <20220526175408.399718-12-bgardon@google.com> Mime-Version: 1.0 References: <20220526175408.399718-1-bgardon@google.com> X-Mailer: git-send-email 2.36.1.124.g0e6072fb45-goog Subject: [PATCH v8 11/11] KVM: selftests: Cache binary stats metadata for duration of test From: Ben Gardon To: kvm@vger.kernel.org, Paolo Bonzini Cc: linux-kernel@vger.kernel.org, Peter Xu , Sean Christopherson , David Matlack , Jim Mattson , David Dunn , Jing Zhang , Junaid Shahid , Ben Gardon Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In order to improve performance across multiple reads of VM stats, cache the stats metadata in the VM struct. Signed-off-by: Ben Gardon --- tools/testing/selftests/kvm/lib/kvm_util.c | 32 ++++++++++--------- .../selftests/kvm/lib/kvm_util_internal.h | 5 +++ 2 files changed, 22 insertions(+), 15 deletions(-) diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index 33d4d64c1391..a32b7b4352b9 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -736,6 +736,12 @@ void kvm_vm_free(struct kvm_vm *vmp) if (vmp == NULL) return; + /* Free cached stats metadata and close FD */ + if (vmp->stats_fd) { + free(vmp->stats_desc); + close(vmp->stats_fd); + } + /* Free userspace_mem_regions. */ hash_for_each_safe(vmp->regions.slot_hash, ctr, node, region, slot_node) __vm_mem_region_delete(vmp, region, false); @@ -2694,34 +2700,30 @@ void read_stat_data(int stats_fd, struct kvm_stats_header *header, void __vm_get_stat(struct kvm_vm *vm, const char *stat_name, uint64_t *data, size_t max_elements) { - struct kvm_stats_desc *stats_desc; - struct kvm_stats_header header; struct kvm_stats_desc *desc; size_t size_desc; - int stats_fd; int i; - stats_fd = vm_get_stats_fd(vm); - - read_stats_header(stats_fd, &header); - - stats_desc = read_stats_descriptors(stats_fd, &header); + if (!vm->stats_fd) { + vm->stats_fd = vm_get_stats_fd(vm); + read_stats_header(vm->stats_fd, &vm->stats_header); + vm->stats_desc = read_stats_descriptors(vm->stats_fd, + &vm->stats_header); + } - size_desc = get_stats_descriptor_size(&header); + size_desc = get_stats_descriptor_size(&vm->stats_header); - for (i = 0; i < header.num_desc; ++i) { - desc = (void *)stats_desc + (i * size_desc); + for (i = 0; i < vm->stats_header.num_desc; ++i) { + desc = (void *)vm->stats_desc + (i * size_desc); if (strcmp(desc->name, stat_name)) continue; - read_stat_data(stats_fd, &header, desc, data, max_elements); + read_stat_data(vm->stats_fd, &vm->stats_header, desc, + data, max_elements); break; } - - free(stats_desc); - close(stats_fd); } /* VM disable NX huge pages diff --git a/tools/testing/selftests/kvm/lib/kvm_util_internal.h b/tools/testing/selftests/kvm/lib/kvm_util_internal.h index a03febc24ba6..e753edd7b8d3 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util_internal.h +++ b/tools/testing/selftests/kvm/lib/kvm_util_internal.h @@ -67,6 +67,11 @@ struct kvm_vm { vm_vaddr_t idt; vm_vaddr_t handlers; uint32_t dirty_ring_size; + + /* Cache of information for binary stats interface */ + int stats_fd; + struct kvm_stats_header stats_header; + struct kvm_stats_desc *stats_desc; }; struct vcpu *vcpu_find(struct kvm_vm *vm, uint32_t vcpuid); -- 2.36.1.124.g0e6072fb45-goog