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Sun, 27 Jun 2021 22:38:16 -0700 (PDT) Received: from localhost.localdomain ([197.61.111.52]) by smtp.gmail.com with ESMTPSA id 22sm12127084wmi.4.2021.06.27.22.38.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 27 Jun 2021 22:38:16 -0700 (PDT) From: Mahmoud Mandour To: qemu-devel@nongnu.org Subject: [PATCH v5] docs/devel: Added cache plugin to the plugins docs Date: Mon, 28 Jun 2021 07:38:08 +0200 Message-Id: <20210628053808.17422-1-ma.mandourr@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210623125458.450462-5-ma.mandourr@gmail.com> References: <20210623125458.450462-5-ma.mandourr@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::330; envelope-from=ma.mandourr@gmail.com; helo=mail-wm1-x330.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, FREEMAIL_FROM=0.001, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mahmoud Mandour , =?UTF-8?q?Alex=20Benn=C3=A9e?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Mahmoud Mandour --- v4 -> v5: Fixed the illustrated command since it has path problems... docs/devel/tcg-plugins.rst | 59 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) diff --git a/docs/devel/tcg-plugins.rst b/docs/devel/tcg-plugins.rst index 18c6581d85..595b8e0ea4 100644 --- a/docs/devel/tcg-plugins.rst +++ b/docs/devel/tcg-plugins.rst @@ -319,3 +319,62 @@ the user to see what hardware is accessed how often. It has a number of options: off:0000001c, 1, 2 off:00000020, 1, 2 ... + +- contrib/plugins/cache + +Cache modelling plugin that measures the performance of a given cache +configuration when a given working set is run:: + + ./x86_64-linux-user/qemu-x86_64 -plugin ./contrib/plugins/libcache.so \ + -d plugin -D cache.log ./tests/tcg/x86_64-linux-user/float_convs + +will report the following:: + + Data accesses: 996479, Misses: 507 + Miss rate: 0.050879% + + Instruction accesses: 2641737, Misses: 18617 + Miss rate: 0.704726% + + address, data misses, instruction + 0x424f1e (_int_malloc), 109, movq %rax, 8(%rcx) + 0x41f395 (_IO_default_xsputn), 49, movb %dl, (%rdi, %rax) + 0x42584d (ptmalloc_init.part.0), 33, movaps %xmm0, (%rax) + 0x454d48 (__tunables_init), 20, cmpb $0, (%r8) + ... + + address, fetch misses, instruction + 0x4160a0 (__vfprintf_internal), 744, movl $1, %ebx + 0x41f0a0 (_IO_setb), 744, endbr64 + 0x415882 (__vfprintf_internal), 744, movq %r12, %rdi + 0x4268a0 (__malloc), 696, andq $0xfffffffffffffff0, %rax + ... + +The plugin has a number of arguments, all of them are optional: + + * arg="limit=N" + + Print top N icache and dcache thrashing instructions along with their + address, number of misses, and its disassembly. (default: 32) + + * arg="icachesize=N" + * arg="iblksize=B" + * arg="iassoc=A" + + Instruction cache configuration arguments. They specify the cache size, block + size, and associativity of the instruction cache, respectively. + (default: N = 16384, B = 64, A = 8) + + * arg="dcachesize=N" + * arg="dblksize=B" + * arg="dassoc=A" + + Data cache configuration arguments. They specify the cache size, block size, + and associativity of the data cache, respectively. + (default: N = 16384, B = 64, A = 8) + + * arg="evict=POLICY" + + Sets the eviction policy to POLICY. Available policies are: :code:`lru`, + :code:`fifo`, and :code:`rand`. The plugin will use the specified policy for + both instruction and data caches. (default: POLICY = :code:`lru`) -- 2.25.1