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[209.51.188.17]) by mx.google.com with ESMTPS id j25-20020ac85519000000b0035ca95c3b44si4563617qtq.505.2022.10.04.06.57.27 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 04 Oct 2022 06:57:27 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=ZDmmF2EG; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from localhost ([::1]:52388 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ofiQI-0007Fn-V8 for patch@linaro.org; Tue, 04 Oct 2022 09:57:26 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:60882) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ofhgW-0007ml-4n for qemu-devel@nongnu.org; Tue, 04 Oct 2022 09:10:08 -0400 Received: from mail-wr1-x432.google.com ([2a00:1450:4864:20::432]:41783) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1ofhgT-0000Hc-IN for qemu-devel@nongnu.org; Tue, 04 Oct 2022 09:10:07 -0400 Received: by mail-wr1-x432.google.com with SMTP id bu30so1360299wrb.8 for ; Tue, 04 Oct 2022 06:10:05 -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=Gc5efp4TKI9Un8YLuLzBs+j1jFkZeAySokvshtzhWKI=; b=ZDmmF2EG5SuxME74vWpDuUCYL7PoVEkha7ulqN4MJtmiuKUnn7AlBPt6iF8PFAU9t6 aDKiviydgBeFqQrtb7yWapuqh546zZ41j+u5G9OKXhqDkT37Jb5zfAw4JbEcDVD27m7L hY1EMRX977q37gEfbwlV32jyyRT09hrDy6/liQ7u67GsRnXRGe9YInQvY/7gB/xTgPnT SP03Q4NvaUUzUY6sM0cobo3OuQvAi4Nzaf/vtgYIsgYHjGyLEGaKRbtDsTN+mOLWPSAn WVd0Wz68OaSdmCOabrmJwPeEnii4mCI1YHF4zSlhKcBgJPEGC/bYMlwtdW/6u2tGo/SE G26g== 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=Gc5efp4TKI9Un8YLuLzBs+j1jFkZeAySokvshtzhWKI=; b=7Ay0rD33pQat7UFU068DDAfW85Asp1PRn20T9JQnKTLHdqc6JIYeWeZcbQImCcHvwF /AwgyYGOt8cbxyiWj9eiDL3Q+UaO4r13o1aP4oX+Jh9Ec+bIAaWW2clFoBj2DU8VQmiP He2Q0/DYGg7W47XXP+KEJeoFLv11Y2lcl88ZY4B2slOQLN6JfdiqAmj/kLho4RhuboAg 8Pl13UXB7gbnw8Tns+UxLyQKjZStzT1cUVTqLJE1ldYH0MbtxT6XCwObMbJ1pc7wJagC zXygRi/UpwuuU/6CZeKt0gvhCRzEVq03hqgFvMIF7yDeGzol2PGp59JITQGFHUEhEMYo b5eg== X-Gm-Message-State: ACrzQf2k+/YhqLaZLGUgi/nZ4oaAm1Od2bhPKTJQPJU7AzTUzpZeuoah zXpOvoDncvxGRVV0jaH8Q2hV+adqOrlvDQ== X-Received: by 2002:adf:db03:0:b0:22a:dd80:4b45 with SMTP id s3-20020adfdb03000000b0022add804b45mr15674036wri.111.1664889003990; Tue, 04 Oct 2022 06:10:03 -0700 (PDT) Received: from zen.linaroharston ([185.81.254.11]) by smtp.gmail.com with ESMTPSA id be7-20020a05600c1e8700b003b476bb2624sm14140278wmb.6.2022.10.04.06.09.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 04 Oct 2022 06:10:02 -0700 (PDT) Received: from zen.lan (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id C43371FFDC; Tue, 4 Oct 2022 14:01:42 +0100 (BST) From: =?utf-8?q?Alex_Benn=C3=A9e?= To: qemu-devel@nongnu.org Cc: stefanha@redhat.com, =?utf-8?q?Alex_Benn=C3=A9e?= , Alexandre Iooss , Mahmoud Mandour Subject: [PULL 40/54] docs/devel: document the test plugins Date: Tue, 4 Oct 2022 14:01:24 +0100 Message-Id: <20221004130138.2299307-41-alex.bennee@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221004130138.2299307-1-alex.bennee@linaro.org> References: <20221004130138.2299307-1-alex.bennee@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::432; envelope-from=alex.bennee@linaro.org; helo=mail-wr1-x432.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+patch=linaro.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 Message-Id: <20220929114231.583801-41-alex.bennee@linaro.org> 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