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[97.113.7.119]) by smtp.gmail.com with ESMTPSA id i3sm92149782pfo.138.2019.08.05.17.05.12 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Mon, 05 Aug 2019 17:05:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=7UQASDLrOuEF/hUHDxJjRqnvDqT4SknEM9H9useKOF0=; b=yNC2n1JwKlOEdhDUriaGW8KrTWfzkYCUOwpOHVwU2PqdBSqYs19X2N6xZXH4/INZn7 fzIKYfCyisl1/LnI3/PxuHF/aG701rAFUku/VvAGnJttWMmivL0IKBvM8aDtEA+4h0Bq 2tIjd5PlynA0qyNKwMNQWFbBtrMHFGRCAvkgbqqoR4+9+/wk7/kSL+iQtGGUb9itnJ5v dMeSuNKbkPLurNZmC+ZE24d2NJ/Qeur7Dfwn7OQZPDO4iyKEw4ZfTOh2lipzUVh5M7wa WkjAXQLrK0qK0BNId0JomCynIY3fFfgfVZCmvZ1pBjpR3VqVm38RRQL0iGWsJ0Annx1T xHbQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=7UQASDLrOuEF/hUHDxJjRqnvDqT4SknEM9H9useKOF0=; b=VzgQQX8WBGFm9EA3PlFM69YDIA47k7n5BUvnf7ZtXywOFRsPW2tl4bML9zmr3iWg+3 43hYLyOkluh8U99rtJEsOQvIA06oyu55eTFanBOUiHfVcKKuT3IKG8XNGHgW1QiM/Xwo UjSFUqKxIrWEehi1XCl0ioupncJjIeKs7ePysB9aF4AgLNQ6M6n+0qRnseJt+kj38KBi FMcD98x9fyLoC+EBOqXuEZUYrJD96pe9ji5eWZbdvAeVt4YwKeq0kVj5oDp/uEturz/P M1QPFqq26v0T6MiBPS76DwD/lBccZsD5+sXqykEvcbbA0jopTtjDFAM9VFwIzyFcDQre VRQA== X-Gm-Message-State: APjAAAVLIyXx9fD3HOP+Mqpq8lpMEo+BSgAnoC1wcjCD1/v+NmzD7qWO AzKx4fyMfAZ7qZlgAHAVtVw51Ws5cRY= X-Google-Smtp-Source: APXvYqxA6THu0LYqwsb3uKQiJQUnuFL3Z6q79+gRAGl6FWorHHJqr8g4fsWj4h3SeyekvoBRfXMv0w== X-Received: by 2002:a17:90a:25c8:: with SMTP id k66mr276028pje.129.1565049913622; Mon, 05 Aug 2019 17:05:13 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Mon, 5 Aug 2019 17:05:06 -0700 Message-Id: <20190806000506.10833-4-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190806000506.10833-1-richard.henderson@linaro.org> References: <20190806000506.10833-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::441 Subject: [Qemu-devel] [PATCH v4 3/3] target/arm: Rely on hflags correct in cpu_get_tb_cpu_state 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: peter.maydell@linaro.org, qemu-arm@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) This is the payoff. From perf record -g data of ubuntu 18 boot and shutdown: BEFORE: - 23.02% 2.82% qemu-system-aar [.] helper_lookup_tb_ptr - 20.22% helper_lookup_tb_ptr + 10.05% tb_htable_lookup - 9.13% cpu_get_tb_cpu_state 3.20% aa64_va_parameters_both 0.55% fp_exception_el - 11.66% 4.74% qemu-system-aar [.] cpu_get_tb_cpu_state - 6.96% cpu_get_tb_cpu_state 3.63% aa64_va_parameters_both 0.60% fp_exception_el 0.53% sve_exception_el AFTER: - 16.40% 3.40% qemu-system-aar [.] helper_lookup_tb_ptr - 13.03% helper_lookup_tb_ptr + 11.19% tb_htable_lookup 0.55% cpu_get_tb_cpu_state 0.98% 0.71% qemu-system-aar [.] cpu_get_tb_cpu_state 0.87% 0.24% qemu-system-aar [.] rebuild_hflags_a64 Before, helper_lookup_tb_ptr is the second hottest function in the application, consuming almost a quarter of the runtime. Within the entire execution, cpu_get_tb_cpu_state consumes about 12%. After, helper_lookup_tb_ptr has dropped to the fourth hottest function, with consumption dropping to a sixth of the runtime. Within the entire execution, cpu_get_tb_cpu_state has dropped below 1%, and the supporting function to rebuild hflags also consumes about 1%. Assertions are retained for --enable-debug-tcg. Tested-by: Alex Benn=C3=A9e Reviewed-by: Alex Benn=C3=A9e Signed-off-by: Richard Henderson --- v2: Retain asserts for future debugging. --- target/arm/helper.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/target/arm/helper.c b/target/arm/helper.c index 9b07350cfe..abb8cc52dd 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -11155,19 +11155,29 @@ void HELPER(rebuild_hflags_a64)(CPUARMState *env,= uint32_t el) void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc, target_ulong *cs_base, uint32_t *pflags) { - int current_el =3D arm_current_el(env); - uint32_t flags; + uint32_t flags =3D env->hflags; uint32_t pstate_for_ss; =20 +#ifdef CONFIG_DEBUG_TCG + { + int el =3D arm_current_el(env); + uint32_t check_flags; + if (is_a64(env)) { + check_flags =3D rebuild_hflags_a64(env, el); + } else { + check_flags =3D rebuild_hflags_a32(env, el); + } + assert(flags =3D=3D check_flags); + } +#endif + *cs_base =3D 0; - if (is_a64(env)) { + if (FIELD_EX32(flags, TBFLAG_ANY, AARCH64_STATE)) { *pc =3D env->pc; - flags =3D rebuild_hflags_a64(env, current_el); flags =3D FIELD_DP32(flags, TBFLAG_A64, BTYPE, env->btype); pstate_for_ss =3D env->pstate; } else { *pc =3D env->regs[15]; - flags =3D rebuild_hflags_a32(env, current_el); flags =3D FIELD_DP32(flags, TBFLAG_A32, THUMB, env->thumb); flags =3D FIELD_DP32(flags, TBFLAG_A32, CONDEXEC, env->condexec_bi= ts); /* Note that XSCALE_CPAR shares bits with VECSTRIDE */ --=20 2.17.1