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Mon, 13 Oct 2025 07:14:16 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFHETg7OzrKPGssdxOk4Xay7k9qUcbXQBRsqtLsD0xpqB63fcoVeQyDZ4FRhiiS3UOs6njcyA== X-Received: by 2002:a05:600c:628e:b0:46e:38f7:625f with SMTP id 5b1f17b1804b1-46fa9aa2123mr128366395e9.10.1760364855797; Mon, 13 Oct 2025 07:14:15 -0700 (PDT) Received: from gmonaco-thinkpadt14gen3.rmtit.csb ([185.107.56.35]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-46fab3d2d65sm126639365e9.2.2025.10.13.07.14.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Oct 2025 07:14:15 -0700 (PDT) Message-ID: Subject: Re: [PATCH v2 15/20] rv: Convert the opid monitor to a hybrid automaton From: Gabriele Monaco To: Nam Cao , linux-kernel@vger.kernel.org, Steven Rostedt , Jonathan Corbet , Masami Hiramatsu , linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org Cc: Tomas Glozar , Juri Lelli , Clark Williams , John Kacur Date: Mon, 13 Oct 2025 16:14:13 +0200 In-Reply-To: <87cy6uygn9.fsf@yellow.woof> References: <20250919140954.104920-1-gmonaco@redhat.com> <20250919140954.104920-16-gmonaco@redhat.com> <87cy6uygn9.fsf@yellow.woof> Autocrypt: addr=gmonaco@redhat.com; prefer-encrypt=mutual; keydata=mDMEZuK5YxYJKwYBBAHaRw8BAQdAmJ3dM9Sz6/Hodu33Qrf8QH2bNeNbOikqYtxWFLVm0 1a0JEdhYnJpZWxlIE1vbmFjbyA8Z21vbmFjb0BrZXJuZWwub3JnPoiZBBMWCgBBFiEEysoR+AuB3R Zwp6j270psSVh4TfIFAmjKX2MCGwMFCQWjmoAFCwkIBwICIgIGFQoJCAsCBBYCAwECHgcCF4AACgk Q70psSVh4TfIQuAD+JulczTN6l7oJjyroySU55Fbjdvo52xiYYlMjPG7dCTsBAMFI7dSL5zg98I+8 cXY1J7kyNsY6/dcipqBM4RMaxXsOtCRHYWJyaWVsZSBNb25hY28gPGdtb25hY29AcmVkaGF0LmNvb T6InAQTFgoARAIbAwUJBaOagAULCQgHAgIiAgYVCgkICwIEFgIDAQIeBwIXgBYhBMrKEfgLgd0WcK eo9u9KbElYeE3yBQJoymCyAhkBAAoJEO9KbElYeE3yjX4BAJ/ETNnlHn8OjZPT77xGmal9kbT1bC1 7DfrYVISWV2Y1AP9HdAMhWNAvtCtN2S1beYjNybuK6IzWYcFfeOV+OBWRDQ== User-Agent: Evolution 3.56.2 (3.56.2-2.fc42) Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: VriPPjYUz1YVGWr6lns6ebOIm4Doq4u89Fwy_sjl_Dc_1760364856 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2025-10-10 at 16:29 +0200, Nam Cao wrote: > > +=09=09 * If CONFIG_PREEMPTION is enabled, then the tracepoint > > itself disables > > +=09=09 * preemption (adding one to the preempt_count). Since we > > are > > +=09=09 * interested in the preempt_count at the time the > > tracepoint was > > +=09=09 * hit, we consider 1 as still enabled. > > +=09=09 */ > > +=09=09if (IS_ENABLED(CONFIG_PREEMPTION)) > > +=09=09=09return (preempt_count() & PREEMPT_MASK) > 1; >=20 > FYI, there is plan to keep preemption enabled during tracepoint > handling. So keep that in mind when this monitor breaks. Right, I've heard of it, thanks for the heads up. I'll adapt the monitors o= nce that happens. Thanks, Gabriele