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 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 05DD4C4332F for ; Thu, 29 Sep 2022 15:15:53 +0000 (UTC) Received: from localhost ([::1]:55470 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1odvGR-0006rH-VJ for qemu-devel@archiver.kernel.org; Thu, 29 Sep 2022 11:15:52 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:37766) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1odsD1-0007Uq-H7 for qemu-devel@nongnu.org; Thu, 29 Sep 2022 08:00:07 -0400 Received: from mail-wr1-x42d.google.com ([2a00:1450:4864:20::42d]:43998) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1odsCv-0004PK-2I for qemu-devel@nongnu.org; Thu, 29 Sep 2022 08:00:07 -0400 Received: by mail-wr1-x42d.google.com with SMTP id h7so1798671wru.10 for ; Thu, 29 Sep 2022 05:00:00 -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=NkejQo14YoKW4YZpsBZJ/pz1ZNt0+OQHO1iaD1STJCE=; b=gNsukcQZMgmQY0jP1nvYUYcGc5XSXQ6KQFeabr3+4PRVphyerKXGpKtxtMKqOP8LjT uYtTKKNJgpFAByw8cO61saFNI70hDSqi1BPEU9BkykPJ8a/Ly9UUlF32WtlgEaEWxCdA xpeximmhwFaw2Ngs0SW0og3zEAQ/Jb/GEdYipUhMKoPUERKpstu+7VJU0bn+w51buNxU 4+SAA7yrK+JJaDckLVSNp3NlwPO8nYNcj+zhcYHpHQbHEp8yvHOTdSFDyTve6Bzm3MYc P47JOdPokoI48hmZmN/OzD2D3qWwovcKBcXSUZLJ4A16VI6ct1VPOTddT6MhsWzJm2cK 2W0w== 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=NkejQo14YoKW4YZpsBZJ/pz1ZNt0+OQHO1iaD1STJCE=; b=kzJF1rMwsY3AXHPpv8bVq08np7QQU5UpoGLPUcuA5xyfGcj3TH8bseRAYeESiEwxp+ fa/ZbZS8F+xMAtqcLUsP5EfnbrvqSFv7c45fNcZUqYwVS6ob5r75D0S5So+POV81zvoq yzx/vi0cujnWzc4mXkKlt0SXmxBU5CsnG82cTYYPdjuKDpk8eRDxl6nxREn1ae8u0iWN nU0Uc0VT6/ad8Ro8lTnfJxOapKEHVJ7HYS1kfsVLSLLMTyDJV+8BRxjcg7p26cRYSdKC w0x0yD4xeJ7W6l3snCajTEGWDwBXF+nhlDVW8pTWYrcbzDDUajH1dpWrRK0Pzm0/z1mx dDFA== X-Gm-Message-State: ACrzQf2pRNvrOTEj+86lRbi8HnlAVDCmQUVrZdBF/vTQBe62AcLAx7Y1 /lMceSvfxPXLqQUUhnfR49RqJQ== X-Google-Smtp-Source: AMsMyM4zvdz8LIoMjenxyb23bDxUO16gyBHdGR/qWw/+qkpKGLwdlRT2SsEADlA/fTSjKp2uMNlAGg== X-Received: by 2002:a05:6000:1447:b0:22a:ea42:29f7 with SMTP id v7-20020a056000144700b0022aea4229f7mr2118331wrx.38.1664452799590; Thu, 29 Sep 2022 04:59:59 -0700 (PDT) Received: from zen.linaroharston ([185.81.254.11]) by smtp.gmail.com with ESMTPSA id h14-20020a05600016ce00b0022aeba020casm6651414wrf.83.2022.09.29.04.59.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Sep 2022 04:59:55 -0700 (PDT) Received: from zen.lan (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id C43621FFD9; Thu, 29 Sep 2022 12:42:35 +0100 (BST) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: qemu-devel@nongnu.org Cc: fam@euphon.net, berrange@redhat.com, f4bug@amsat.org, aurelien@aurel32.net, pbonzini@redhat.com, stefanha@redhat.com, crosa@redhat.com, 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=20Benn=C3=A9e?= , Alexandre Iooss Subject: [PATCH v1 40/51] docs/devel: document the test plugins Date: Thu, 29 Sep 2022 12:42:20 +0100 Message-Id: <20220929114231.583801-41-alex.bennee@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220929114231.583801-1-alex.bennee@linaro.org> References: <20220929114231.583801-1-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::42d; envelope-from=alex.bennee@linaro.org; helo=mail-wr1-x42d.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 Message-Id: <20220921160801.1490125-11-alex.bennee@linaro.org> --- 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 -- 2.34.1