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[212.8.243.115]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c17009ae10fsm549472666b.10.2026.07.20.23.24.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Jul 2026 23:24:12 -0700 (PDT) Message-ID: <3c4b83ceb8df81aaefd93404c4d69063db965004.camel@redhat.com> Subject: Re: [PATCH v4 16/17] selftests/verification: Rearrange the wwnr_printk test From: Gabriele Monaco To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Steven Rostedt , Shuah Khan , linux-kselftest@vger.kernel.org Cc: Wen Yang , Nam Cao , Thomas Weissschuh , Tomas Glozar , John Kacur Date: Tue, 21 Jul 2026 08:24:10 +0200 In-Reply-To: <20260717154638.220789-17-gmonaco@redhat.com> References: <20260717154638.220789-1-gmonaco@redhat.com> <20260717154638.220789-17-gmonaco@redhat.com> Autocrypt: addr=gmonaco@redhat.com; prefer-encrypt=mutual; keydata=mDMEZuK5YxYJKwYBBAHaRw8BAQdAmJ3dM9Sz6/Hodu33Qrf8QH2bNeNbOikqYtxWFLVm0 1a0JEdhYnJpZWxlIE1vbmFjbyA8Z21vbmFjb0BrZXJuZWwub3JnPoiZBBMWCgBBFiEEysoR+AuB3R Zwp6j270psSVh4TfIFAmjKX2MCGwMFCQWjmoAFCwkIBwICIgIGFQoJCAsCBBYCAwECHgcCF4AACgk Q70psSVh4TfIQuAD+JulczTN6l7oJjyroySU55Fbjdvo52xiYYlMjPG7dCTsBAMFI7dSL5zg98I+8 cXY1J7kyNsY6/dcipqBM4RMaxXsOtCRHYWJyaWVsZSBNb25hY28gPGdtb25hY29AcmVkaGF0LmNvb T6InAQTFgoARAIbAwUJBaOagAULCQgHAgIiAgYVCgkICwIEFgIDAQIeBwIXgBYhBMrKEfgLgd0WcK eo9u9KbElYeE3yBQJoymCyAhkBAAoJEO9KbElYeE3yjX4BAJ/ETNnlHn8OjZPT77xGmal9kbT1bC1 7DfrYVISWV2Y1AP9HdAMhWNAvtCtN2S1beYjNybuK6IzWYcFfeOV+OBWRDQ== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.60.2 (3.60.2-1.fc44) Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Fri, 2026-07-17 at 17:46 +0200, Gabriele Monaco wrote: > +# loads may flood the ringbuffer, wait for all pending printks > +wait_dmesg_flush() { > + local last_before last_after=3D$(dmesg | grep "rv:" | tail -n 1 || > true) > + while [ "$last_before" !=3D "$last_after" ]; do > + last_before=3D$last_after > + sleep .3 > + last_after=3D$(dmesg | grep "rv:" | tail -n 1 || true) > + done > =C2=A0} > =C2=A0 > =C2=A0echo 1 > monitors/wwnr/enable > =C2=A0echo printk > monitors/wwnr/reactors > =C2=A0 > =C2=A0load > +wait_dmesg_flush On some systems this may trigger wwnr's reactions and run indefinitely, I'm going to send a V5 moving this after turning monitoring/reacting of and add= ing a timeout, just in case those switches don't work. > =C2=A0 > =C2=A0echo 0 > monitoring_on > =C2=A0! load || false > =C2=A0echo 1 > monitoring_on > =C2=A0 > =C2=A0load > +wait_dmesg_flush > =C2=A0 > =C2=A0echo 0 > reacting_on > =C2=A0! load || false