From patchwork Tue Nov 5 19:55:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Colton Lewis X-Patchwork-Id: 13863497 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id AB9EAD36122 for ; Tue, 5 Nov 2024 19:58:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:Cc:To:From: Subject:Message-ID:Mime-Version:Date:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=hzMiS31Q99SH+ivi/H+fLjhfNr8W/1ENyadMPU3uzYk=; b=t2ogkEEUN2JriXb74mb1XeQR9L c3/TzO/d6EHQ6wfHgc6cbxP6jkXNF28Lp406TiINSJDMa1td/83OvpjqB6wlW76/ZPzbISXN/e6Mo RJAJW9ZHuEs7/LMuZmXGOvW3gZwYNmkfHmTzWly0YR2ntBvd8zTWo7gaW+w5eOgrvEvRbAji+LFbN ljc7vr5U/3Zx9zs8GKKE2Nwp3rAKa2un3skuf1OIIKV2WcFZ1WBNtqXiYIIu3s2w1CeU5hq80eXVq 6DhtnXaSwspfP9V2u5mtCuv4vb5X+ICougd/tNa/WKs4aAOP4IDJwXCLsNYLcDwsT3KNz8/zPonIp ukGOA4qg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t8Ph2-00000000d60-3Oln; Tue, 05 Nov 2024 19:58:25 +0000 Received: from mail-yw1-x1149.google.com ([2607:f8b0:4864:20::1149]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t8PfC-00000000cUx-2mku for linux-arm-kernel@lists.infradead.org; Tue, 05 Nov 2024 19:56:32 +0000 Received: by mail-yw1-x1149.google.com with SMTP id 00721157ae682-6e1fbe2a6b1so109903147b3.2 for ; Tue, 05 Nov 2024 11:56:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1730836589; x=1731441389; darn=lists.infradead.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=hzMiS31Q99SH+ivi/H+fLjhfNr8W/1ENyadMPU3uzYk=; b=qMpjxmypF3O1+4iI+crh343GYB316bf12x0Izzf8RNxvtWO0Fpg/q1ra0HPEKxu3Mc CLPECcqpN2tN+yI1XTTr2kCKgIhvNGS8l2k0eWwVbAxbzy1gaVHecrk25AGkpTbtoHCf 15XXJLhFIxEOt3h/0ZFjluskyqWqBjUu6Gl8wuMolvYLCCpCmhvpS9qPuGorC73kVNDa zirf3KGiXXPFymaJRPUPBbCjMkdoox3fM7gS79RD8mFlXZcSVZ/cUcrTaiYY5mcYk1bP I/hCyDF7LuTWmtSrhyx/UMv7NXuxhuYvOYdMu/JxtznWrDXNYE3sGIl8pt3t2TyCJIQ6 GIRQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1730836589; x=1731441389; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=hzMiS31Q99SH+ivi/H+fLjhfNr8W/1ENyadMPU3uzYk=; b=lrzbz0ngwHe6wNdJZUpPkcpgIqt6RvnGaGWXy8JmzBJd9ISwdoBC9UzpGSe6x+XNEh 8HYvndOd6pEtogIADm25OcpgO6wJda3/3WYgLd86BZtopc8Amj+e8TwunUoCJ8gJ+bOx acZQjNUN6DmLR9wdExFTcwVWLKN7bIvhpSHwMDounJzXn+P3eCZXvKHqTUsMYOgBz9M5 ge+gDt2Msr7UTMPkTsWYJ8+7F3vdBDkBkxEF3fOhQGzPM0NM8gqkM6yP8JMcEuln8QzC 9Y0pRwiEqe2qkWSWg5II6W/zhiGrziZpnq4+efJ3noVHy3QwlTpGAKUWBrfK8OJaPW64 1cnA== X-Forwarded-Encrypted: i=1; AJvYcCXzHXUAWd69tkXdWBSZrvsbN7NEMnLC3yEulE6g9II7kSSLNpwvx+fkn3a0fOBYuk/JPLrthGmSpHr35nDOj+5a@lists.infradead.org X-Gm-Message-State: AOJu0YxVZBJModwup8NN2W1bsP3qGmTUb0JrA9Y0YglO64nQoMEdhgc5 R+/9BIz3VY195MvefFlT4GKRc8vj7hre1cJaJNHUuPR67SkIv9uyOT/nFxfr38ToxsKS3Qv6UNc 0GugH8/iZaCT/T8qHoVP4qw== X-Google-Smtp-Source: AGHT+IGCeubudBZvDHKVyK9hoysogwq8Oy8BphtTGtN9ESDHF0Oe45MlIu4/byZXs6BbgdCbpbF4nba1Gh+JSm/9sQ== X-Received: from coltonlewis-kvm.c.googlers.com ([fda3:e722:ac3:cc00:11b:3898:ac11:fa18]) (user=coltonlewis job=sendgmr) by 2002:a25:b28e:0:b0:e29:6df8:ef58 with SMTP id 3f1490d57ef6-e3087a5bd64mr143088276.4.1730836589136; Tue, 05 Nov 2024 11:56:29 -0800 (PST) Date: Tue, 5 Nov 2024 19:55:57 +0000 Mime-Version: 1.0 X-Mailer: git-send-email 2.47.0.199.ga7371fff76-goog Message-ID: <20241105195603.2317483-1-coltonlewis@google.com> Subject: [PATCH v6 0/5] Correct perf sampling with Guest VMs From: Colton Lewis To: kvm@vger.kernel.org Cc: Oliver Upton , Sean Christopherson , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , Will Deacon , Russell King , Catalin Marinas , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, Colton Lewis X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241105_115630_782061_265CFBAA X-CRM114-Status: GOOD ( 12.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org v6: * Apply all Reviewed-by and Acked-by trailers from previous versions * Rebase to v6.12-rc6 v5: https://lore.kernel.org/all/20240920174740.781614-1-coltonlewis@google.com/ v4: https://lore.kernel.org/kvm/20240919190750.4163977-1-coltonlewis@google.com/ v3: https://lore.kernel.org/kvm/20240912205133.4171576-1-coltonlewis@google.com/ v2: https://lore.kernel.org/kvm/20240911222433.3415301-1-coltonlewis@google.com/ v1: https://lore.kernel.org/kvm/20240904204133.1442132-1-coltonlewis@google.com/ This series cleans up perf recording around guest events and improves the accuracy of the resulting perf reports. Perf was incorrectly counting any PMU overflow interrupt that occurred while a VCPU was loaded as a guest event even when the events were not truely guest events. This lead to much less accurate and useful perf recordings. See as an example the below reports of `perf record dirty_log_perf_test -m 2 -v 4` before and after the series on ARM64. Without series: Samples: 15K of event 'instructions', Event count (approx.): 31830580924 Overhead Command Shared Object Symbol 54.54% dirty_log_perf_ dirty_log_perf_test [.] run_test 5.39% dirty_log_perf_ dirty_log_perf_test [.] vcpu_worker 0.89% dirty_log_perf_ [kernel.vmlinux] [k] release_pages 0.70% dirty_log_perf_ [kernel.vmlinux] [k] free_pcppages_bulk 0.62% dirty_log_perf_ dirty_log_perf_test [.] userspace_mem_region_find 0.49% dirty_log_perf_ dirty_log_perf_test [.] sparsebit_is_set 0.46% dirty_log_perf_ dirty_log_perf_test [.] _virt_pg_map 0.46% dirty_log_perf_ dirty_log_perf_test [.] node_add 0.37% dirty_log_perf_ dirty_log_perf_test [.] node_reduce 0.35% dirty_log_perf_ [kernel.vmlinux] [k] free_unref_page_commit 0.33% dirty_log_perf_ [kernel.vmlinux] [k] __kvm_pgtable_walk 0.31% dirty_log_perf_ [kernel.vmlinux] [k] stage2_attr_walker 0.29% dirty_log_perf_ [kernel.vmlinux] [k] unmap_page_range 0.29% dirty_log_perf_ dirty_log_perf_test [.] test_assert 0.26% dirty_log_perf_ [kernel.vmlinux] [k] __mod_memcg_lruvec_state 0.24% dirty_log_perf_ [kernel.vmlinux] [k] kvm_s2_put_page With series: Samples: 15K of event 'instructions', Event count (approx.): 31830580924 Samples: 15K of event 'instructions', Event count (approx.): 30898031385 Overhead Command Shared Object Symbol 54.05% dirty_log_perf_ dirty_log_perf_test [.] run_test 5.48% dirty_log_perf_ [kernel.kallsyms] [k] kvm_arch_vcpu_ioctl_run 4.70% dirty_log_perf_ dirty_log_perf_test [.] vcpu_worker 3.11% dirty_log_perf_ [kernel.kallsyms] [k] kvm_handle_guest_abort 2.24% dirty_log_perf_ [kernel.kallsyms] [k] up_read 1.98% dirty_log_perf_ [kernel.kallsyms] [k] __kvm_tlb_flush_vmid_ipa_nsh 1.97% dirty_log_perf_ [kernel.kallsyms] [k] __pi_clear_page 1.30% dirty_log_perf_ [kernel.kallsyms] [k] down_read 1.13% dirty_log_perf_ [kernel.kallsyms] [k] release_pages 1.12% dirty_log_perf_ [kernel.kallsyms] [k] __kvm_pgtable_walk 1.08% dirty_log_perf_ [kernel.kallsyms] [k] folio_batch_move_lru 1.06% dirty_log_perf_ [kernel.kallsyms] [k] __srcu_read_lock 1.03% dirty_log_perf_ [kernel.kallsyms] [k] get_page_from_freelist 1.01% dirty_log_perf_ [kernel.kallsyms] [k] __pte_offset_map_lock 0.82% dirty_log_perf_ [kernel.kallsyms] [k] handle_mm_fault 0.74% dirty_log_perf_ [kernel.kallsyms] [k] mas_state_walk Colton Lewis (5): arm: perf: Drop unused functions perf: Hoist perf_instruction_pointer() and perf_misc_flags() powerpc: perf: Use perf_arch_instruction_pointer() x86: perf: Refactor misc flag assignments perf: Correct perf sampling with guest VMs arch/arm/include/asm/perf_event.h | 7 --- arch/arm/kernel/perf_callchain.c | 17 ------- arch/arm64/include/asm/perf_event.h | 4 -- arch/arm64/kernel/perf_callchain.c | 28 ------------ arch/powerpc/include/asm/perf_event_server.h | 6 +-- arch/powerpc/perf/callchain.c | 2 +- arch/powerpc/perf/callchain_32.c | 2 +- arch/powerpc/perf/callchain_64.c | 2 +- arch/powerpc/perf/core-book3s.c | 4 +- arch/s390/include/asm/perf_event.h | 6 +-- arch/s390/kernel/perf_event.c | 4 +- arch/x86/events/core.c | 47 +++++++++++--------- arch/x86/include/asm/perf_event.h | 12 ++--- include/linux/perf_event.h | 26 +++++++++-- kernel/events/core.c | 27 ++++++++++- 15 files changed, 95 insertions(+), 99 deletions(-) base-commit: 59b723cd2adbac2a34fc8e12c74ae26ae45bf230 --- 2.47.0.199.ga7371fff76-goog