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([2a00:23c6:9e09:2900:3d38:90c1:858b:902e]) by smtp.gmail.com with ESMTPSA id n128sm9674675wmb.47.2020.05.13.07.42.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 13 May 2020 07:42:08 -0700 (PDT) Subject: Re: x86/smp: adding new trace points To: Thomas Gleixner , linux-kernel@vger.kernel.org Cc: mingo@redhat.com, hpa@zytor.com, x86@kernel.org References: <4d54953b-f968-63f5-569f-9e09bc0f361c@gmail.com> <87y2pw2fav.fsf@nanos.tec.linutronix.de> From: Wojciech Kudla Message-ID: Date: Wed, 13 May 2020 15:42:07 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <87y2pw2fav.fsf@nanos.tec.linutronix.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 13/05/2020 13:24, Thomas Gleixner wrote: > Why would the SMP call function single interrupt go through the > PLATFORM_IPI_VECTOR? It goes as the name says through the > CALL_FUNCTION_SINGLE_VECTOR. > Wrong vector, my bad. However 2) still stands in my opinion. We don't have "ipi raise" trace point for x86. RESCHEDULE_VECTOR, CALL_FUNCTION_SINGLE_VECTOR, as well as TLB invalidation vectors are essentially inter-processor-interrupts if I'm not mistaken. Would a patch adding such trace point be considered here? Thanks, Wojtek