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[212.8.243.115]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48ff2cb4ae0sm159772365e9.0.2026.05.19.08.26.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 May 2026 08:26:33 -0700 (PDT) Message-ID: <2d19140a92df11d28f9b74e4a370f55940e042f1.camel@redhat.com> Subject: Re: [PATCH 1/3] rv/rtapp/sleep: Make the error more informative for user From: Gabriele Monaco To: Nam Cao Cc: Steven Rostedt , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Date: Tue, 19 May 2026 17:26:31 +0200 In-Reply-To: <87y0hf2zj9.fsf@yellow.woof> References: <14242f444f7d2396c0c5a345f0099665d09a0ec5.1779176466.git.namcao@linutronix.de> <19cffa1267c6538e6310b0149b0367807af76ac0.camel@redhat.com> <87y0hf2zj9.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 3.60.1 (3.60.1-1.fc44) 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: -6ujwivkxQpwi2TscFpFsnKOqIZaKYTLLLsZ6dn2fm8_1779204394 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2026-05-19 at 17:24 +0200, Nam Cao wrote: > Gabriele Monaco writes: > > On Tue, 2026-05-19 at 09:49 +0200, Nam Cao wrote: > > > The rtapp/sleep monitor detects real-time tasks which go to sleep in = an > > > real-time-unsafe manner. If this happen, the monitor triggers a trace > > > event > > > in the sched_wakeup tracepoint's handler. > >=20 > > Ok so here WAKE is no longer tied to the wakeup event but to the end of= the > > task > > switch. > >=20 > > So what happens if a task was not sleeping but just got preempted? Woul= dn't > > that > > trigger WAKE (though that isn't a real wakeup) without RT_FRIENDLY_WAKE= ? >=20 > The monitor's rule says that when a task sleeps, it will not wake > without rt-friendly wake. If it "wakes" without initial sleep, it is > simply ignored. Right makes sense. > I can change the name to be SCHEDULE_IN or something like that to make > it clearer. >=20 Yeah that'd be clearer, or at least a comment stating this somewhere. Thanks, Gabriele