From patchwork Wed Sep 21 16:08:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Alex_Benn=C3=A9e?= X-Patchwork-Id: 12983967 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 AAC14ECAAD8 for ; Wed, 21 Sep 2022 16:37:05 +0000 (UTC) Received: from localhost ([::1]:36994 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ob2ie-0007ln-Ey for qemu-devel@archiver.kernel.org; Wed, 21 Sep 2022 12:37:04 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:43556) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ob2ND-000758-O2 for qemu-devel@nongnu.org; Wed, 21 Sep 2022 12:14:55 -0400 Received: from mail-wm1-x333.google.com ([2a00:1450:4864:20::333]:33458) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1ob2NB-0001VY-Ob for qemu-devel@nongnu.org; Wed, 21 Sep 2022 12:14:55 -0400 Received: by mail-wm1-x333.google.com with SMTP id ay7-20020a05600c1e0700b003b49861bf48so2720735wmb.0 for ; Wed, 21 Sep 2022 09:14:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date; bh=GoEs9/h2LLepKNbeRIHGFuvJURS7q8MKK6QKHpul0xk=; b=JyKI51tvaaRmGJEvtwLZkNMg1pNweSuN79tWCjShG5iLTQEZRlc3Nzz6/1ehh16kmw ri3VdHTqBd/yRwL1JlMKwS8WfJsMHAgOGmM9n7kzZ1SGSw8bfMgZuZo7kSYeY9tplrdu XhhyUqxJRI2tcmniWNmeJXTCF2P7C1fL3YEnnPXpiBR3/fJe3JaX2GZx9/DxW/2iP8JU m84gDp99s54rFN7PpyFREuzbzop9lCset84v2X1Rwvyw+7HaMhxbV+Z32IvD8Ch3Y0BV rRypTxRN1i+4pyoSnwZZI3ktd4MMoNH7qDg+yNYPHOR4dcYg3ULSlfz+4Me9R4HIpdqu Yzgg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date; bh=GoEs9/h2LLepKNbeRIHGFuvJURS7q8MKK6QKHpul0xk=; b=D9z9jp+5PtEOqfR6BjUxs7s8Ms0R7KbMC0uBAjCvN2qTAcKD7q230AtX2TqlWgRK9Q i+71m9T9F/iresKdnsc85mJTCa6UZH6Y2mFiF+2b4LvuMM9NJ6C2U5gbmURPSM94T8Us A49o709Mhb5AKiLX0QRZRSURPSvNoBA70cucgFyrjycdBN5N4uFv4LEglApf14miRy2/ 64oCLffCKmI3gy8mMmUdsMlZTE3nKqD5jDiTuwoWe4e02+qPo3pXN5c4MUUjdrLERzUQ zlli75fwhHpcgDdLPcm8bhbo/C2OG+tvFOMXsFqkqs1rQyFPvApnXsOFlN6zSOpA0yGY hb6w== X-Gm-Message-State: ACrzQf3x8VjmvvHNJQKfeFqc9RpKVISKlJz97cpSk5yZfxkZ2YaIimzK VswuMmQTDkVUUx1C30ijT1KQdg== X-Google-Smtp-Source: AMsMyM6kYJVDJTUx48OQtp4d3cM83SM9P21pcTTKIyEAOGspuz70GJJkne483hjjuvE9efftWuW18A== X-Received: by 2002:a05:600c:4ec7:b0:3a8:4622:ad27 with SMTP id g7-20020a05600c4ec700b003a84622ad27mr6786719wmq.88.1663776891802; Wed, 21 Sep 2022 09:14:51 -0700 (PDT) Received: from zen.linaroharston ([185.81.254.11]) by smtp.gmail.com with ESMTPSA id bu23-20020a056000079700b0022a3a887ceasm2889808wrb.49.2022.09.21.09.14.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Sep 2022 09:14:51 -0700 (PDT) Received: from zen.lan (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id 1B8EF1FFC2; Wed, 21 Sep 2022 17:08:02 +0100 (BST) From: =?utf-8?q?Alex_Benn=C3=A9e?= To: qemu-devel@nongnu.org Cc: minyihh@uci.edu, ma.mandourr@gmail.com, Luke.Craig@ll.mit.edu, cota@braap.org, aaron@os.amperecomputing.com, kuhn.chenqun@huawei.com, robhenry@microsoft.com, mahmoudabdalghany@outlook.com, =?utf-8?q?Alex_Benn?= =?utf-8?q?=C3=A9e?= , Alexandre Iooss Subject: [PATCH v1 10/10] docs/devel: document the test plugins Date: Wed, 21 Sep 2022 17:08:01 +0100 Message-Id: <20220921160801.1490125-11-alex.bennee@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220921160801.1490125-1-alex.bennee@linaro.org> References: <20220921160801.1490125-1-alex.bennee@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::333; envelope-from=alex.bennee@linaro.org; helo=mail-wm1-x333.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Although the test plugins are fairly basic they are still useful for some things so we should document their existence. Signed-off-by: Alex Bennée --- docs/devel/tcg-plugins.rst | 137 +++++++++++++++++++++++++++++++++++-- 1 file changed, 133 insertions(+), 4 deletions(-) diff --git a/docs/devel/tcg-plugins.rst b/docs/devel/tcg-plugins.rst index 8b40b2a606..9740a70406 100644 --- a/docs/devel/tcg-plugins.rst +++ b/docs/devel/tcg-plugins.rst @@ -145,12 +145,141 @@ Example Plugins There are a number of plugins included with QEMU and you are encouraged to contribute your own plugins plugins upstream. There is a -``contrib/plugins`` directory where they can go. +``contrib/plugins`` directory where they can go. There are also some +basic plugins that are used to test and exercise the API during the +``make check-tcg`` target in ``tests\plugins``. -- tests/plugins +- tests/plugins/empty.c -These are some basic plugins that are used to test and exercise the -API during the ``make check-tcg`` target. +Purely a test plugin for measuring the overhead of the plugins system +itself. Does no instrumentation. + +- tests/plugins/bb.c + +A very basic plugin which will measure execution in course terms as +each basic block is executed. By default the results are shown once +execution finishes:: + + $ qemu-aarch64 -plugin tests/plugin/libbb.so \ + -d plugin ./tests/tcg/aarch64-linux-user/sha1 + SHA1=15dd99a1991e0b3826fede3deffc1feba42278e6 + bb's: 2277338, insns: 158483046 + +Behaviour can be tweaked with the following arguments: + + * inline=true|false + + Use faster inline addition of a single counter. Not per-cpu and not + thread safe. + + * idle=true|false + + Dump the current execution stats whenever the guest vCPU idles + +- tests/plugins/insn.c + +This is a basic instruction level instrumentation which can count the +number of instructions executed on each core/thread:: + + $ qemu-aarch64 -plugin tests/plugin/libinsn.so \ + -d plugin ./tests/tcg/aarch64-linux-user/threadcount + Created 10 threads + Done + cpu 0 insns: 46765 + cpu 1 insns: 3694 + cpu 2 insns: 3694 + cpu 3 insns: 2994 + cpu 4 insns: 1497 + cpu 5 insns: 1497 + cpu 6 insns: 1497 + cpu 7 insns: 1497 + total insns: 63135 + +Behaviour can be tweaked with the following arguments: + + * inline=true|false + + Use faster inline addition of a single counter. Not per-cpu and not + thread safe. + + * sizes=true|false + + Give a summary of the instruction sizes for the execution + + * match= + + Only instrument instructions matching the string prefix. Will show + some basic stats including how many instructions have executed since + the last execution. For example:: + + $ qemu-aarch64 -plugin tests/plugin/libinsn.so,match=bl \ + -d plugin ./tests/tcg/aarch64-linux-user/sha512-vector + ... + 0x40069c, 'bl #0x4002b0', 10 hits, 1093 match hits, Δ+1257 since last match, 98 avg insns/match + 0x4006ac, 'bl #0x403690', 10 hits, 1094 match hits, Δ+47 since last match, 98 avg insns/match + 0x4037fc, 'bl #0x4002b0', 18 hits, 1095 match hits, Δ+22 since last match, 98 avg insns/match + 0x400720, 'bl #0x403690', 10 hits, 1096 match hits, Δ+58 since last match, 98 avg insns/match + 0x4037fc, 'bl #0x4002b0', 19 hits, 1097 match hits, Δ+22 since last match, 98 avg insns/match + 0x400730, 'bl #0x403690', 10 hits, 1098 match hits, Δ+33 since last match, 98 avg insns/match + 0x4037ac, 'bl #0x4002b0', 12 hits, 1099 match hits, Δ+20 since last match, 98 avg insns/match + ... + +For more detailed execution tracing see the ``execlog`` plugin for +other options. + +- tests/plugins/mem.c + +Basic instruction level memory instrumentation:: + + $ qemu-aarch64 -plugin tests/plugin/libmem.so,inline=true \ + -d plugin ./tests/tcg/aarch64-linux-user/sha1 + SHA1=15dd99a1991e0b3826fede3deffc1feba42278e6 + inline mem accesses: 79525013 + +Behaviour can be tweaked with the following arguments: + + * inline=true|false + + Use faster inline addition of a single counter. Not per-cpu and not + thread safe. + + * callback=true|false + + Use callbacks on each memory instrumentation. + + * hwaddr=true|false + + Count IO accesses (only for system emulation) + +- tests/plugins/syscall.c + +A basic syscall tracing plugin. This only works for user-mode. By +default it will give a summary of syscall stats at the end of the +run:: + + $ qemu-aarch64 -plugin tests/plugin/libsyscall \ + -d plugin ./tests/tcg/aarch64-linux-user/threadcount + Created 10 threads + Done + syscall no. calls errors + 226 12 0 + 99 11 11 + 115 11 0 + 222 11 0 + 93 10 0 + 220 10 0 + 233 10 0 + 215 8 0 + 214 4 0 + 134 2 0 + 64 2 0 + 96 1 0 + 94 1 0 + 80 1 0 + 261 1 0 + 78 1 0 + 160 1 0 + 135 1 0 - contrib/plugins/hotblocks.c