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[212.8.243.115]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4887e80a616sm63968805e9.2.2026.03.31.06.47.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 31 Mar 2026 06:47:09 -0700 (PDT) Message-ID: <100efc7522a019aa78834e99de94cb325750dd43.camel@redhat.com> Subject: Re: [PATCH] rv: Allow epoll in rtapp-sleep monitor From: Gabriele Monaco To: Nam Cao Cc: Steven Rostedt , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Tue, 31 Mar 2026 15:47:07 +0200 In-Reply-To: <87y0j86rq8.fsf@yellow.woof> References: <20260331104918.2710853-1-namcao@linutronix.de> <4b47d5e7e9dde0c76beb1a9383a13553c2455d92.camel@redhat.com> <87y0j86rq8.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== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.3 (3.58.3-1.fc43) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2026-03-31 at 15:41 +0200, Nam Cao wrote: > Gabriele Monaco writes: >=20 > > On Tue, 2026-03-31 at 12:49 +0200, Nam Cao wrote: > > > Since commit 0c43094f8cc9 ("eventpoll: Replace rwlock with spinlock")= , > > > epoll_wait is real-time-safe syscall for sleeping. > > >=20 > > > Add epoll_wait to the list of rt-safe sleeping APIs. > > >=20 > > > Signed-off-by: Nam Cao > >=20 > > Thanks for the patch, looks reasonable. > > I tried re-generating the header (sleep.h) with rvgen based on the new > > specification and I'm getting a different order. > >=20 > > Is what you're committing the result of rvgen on your computer? > > We probably still have some unpredictable result in the rvgen's output = if > > that's > > the case (no big deal then, though it triggers me a bit). >=20 > Right, fixing this is in my list. The script uses set and set's order is > not deterministic. You get different (but equivalent) results every > time. I should start working on that.. Reasonable, no rush. I just noticed this behaviour when trying to write som= e selftests for rvgen and didn't manage to make it deterministic with trivial changes. >=20 > > I would still like to run some tests on this, how urgently would you li= ke > > this > > patch through? I was really about to send Steve a PR with the other cha= nges > > so > > this might need to wait for the next merge window. >=20 > The earlier the better, but no one will die because it misses a merge > window. Alright I'll see if I can squeeze it in within this week, if not, it'll hav= e to wait. For now: Reviewed-by: Gabriele Monaco Thanks, Gabriele