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Wed, 29 Jul 2026 13:20:24 -0700 (PDT) Received: from [10.138.10.6] ([185.98.168.14]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-6691262e498sm2570147d50.16.2026.07.29.13.20.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 29 Jul 2026 13:20:23 -0700 (PDT) Message-ID: Date: Wed, 29 Jul 2026 16:20:18 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 09/20] host/rootfs: Set up parent cgroup for all per-VM services To: Alyssa Ross References: <20260721-cgroups-v4-0-46b2e5fff7b6@gmail.com> <20260721-cgroups-v4-9-46b2e5fff7b6@gmail.com> <871pcoljat.fsf@alyssa.is> <875x1x6f9o.fsf@alyssa.is> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; keydata= xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49yB+l2nipd aq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYfbWpr/si88QKgyGSV Z7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/UorR+FaSuVwT7rqzGrTlscnT DlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7MMPCJwI8JpPlBedRpe9tfVyfu3euTPLPx wcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9Hzx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR 6h3nBc3eyuZ+q62HS1pJ5EvUT1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl 5FMWo8TCniHynNXsBtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2 Bkg1b//r6bTBswMBXVJ5H44Qf0+eKeUg7whSC9qpYOzzrm7+0r9F5u3qF8ZTx55TJc2g656C 9a1P1MYVysLvkLvS4H+crmxA/i08Tc1h+x9RRvqba4lSzZ6/Tmt60DPM5Sc4R0nSm9BBff0N m0bSNRS8InXdO1Aq3362QKX2NOwcL5YaStwODNyZUqF7izjK4QARAQABzTxEZW1pIE1hcmll IE9iZW5vdXIgKGxvdmVyIG9mIGNvZGluZykgPGRlbWlvYmVub3VyQGdtYWlsLmNvbT7CwXgE EwECACIFAlp+A0oCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJELKItV//nCLBhr8Q AK/xrb4wyi71xII2hkFBpT59ObLN+32FQT7R3lbZRjVFjc6yMUjOb1H/hJVxx+yo5gsSj5LS 9AwggioUSrcUKldfA/PKKai2mzTlUDxTcF3vKx6iMXKA6AqwAw4B57ZEJoMM6egm57TV19kz PMc879NV2nc6+elaKl+/kbVeD3qvBuEwsTe2Do3HAAdrfUG/j9erwIk6gha/Hp9yZlCnPTX+ VK+xifQqt8RtMqS5R/S8z0msJMI/ajNU03kFjOpqrYziv6OZLJ5cuKb3bZU5aoaRQRDzkFIR 6aqtFLTohTo20QywXwRa39uFaOT/0YMpNyel0kdOszFOykTEGI2u+kja35g9TkH90kkBTG+a EWttIht0Hy6YFmwjcAxisSakBuHnHuMSOiyRQLu43ej2+mDWgItLZ48Mu0C3IG1seeQDjEYP tqvyZ6bGkf2Vj+L6wLoLLIhRZxQOedqArIk/Sb2SzQYuxN44IDRt+3ZcDqsPppoKcxSyd1Ny 2tpvjYJXlfKmOYLhTWs8nwlAlSHX/c/jz/ywwf7eSvGknToo1Y0VpRtoxMaKW1nvH0OeCSVJ itfRP7YbiRVc2aNqWPCSgtqHAuVraBRbAFLKh9d2rKFB3BmynTUpc1BQLJP8+D5oNyb8Ts4x Xd3iV/uD8JLGJfYZIR7oGWFLP4uZ3tkneDfYzsFNBFp+A0oBEAC9ynZI9LU+uJkMeEJeJyQ/ 8VFkCJQPQZEsIGzOTlPnwvVna0AS86n2Z+rK7R/usYs5iJCZ55/JISWd8xD57ue0eB47bcJv VqGlObI2DEG8TwaW0O0duRhDgzMEL4t1KdRAepIESBEA/iPpI4gfUbVEIEQuqdqQyO4GAe+M kD0Hy5JH/0qgFmbaSegNTdQg5iqYjRZ3ttiswalql1/iSyv1WYeC1OAs+2BLOAT2NEggSiVO txEfgewsQtCWi8H1SoirakIfo45Hz0tk/Ad9ZWh2PvOGt97Ka85o4TLJxgJJqGEnqcFUZnJJ riwoaRIS8N2C8/nEM53jb1sH0gYddMU3QxY7dYNLIUrRKQeNkF30dK7V6JRH7pleRlf+wQcN fRAIUrNlatj9TxwivQrKnC9aIFFHEy/0mAgtrQShcMRmMgVlRoOA5B8RTulRLCmkafvwuhs6 dCxN0GNAORIVVFxjx9Vn7OqYPgwiofZ6SbEl0hgPyWBQvE85klFLZLoj7p+joDY1XNQztmfA rnJ9x+YV4igjWImINAZSlmEcYtd+xy3Li/8oeYDAqrsnrOjb+WvGhCykJk4urBog2LNtcyCj kTs7F+WeXGUo0NDhbd3Z6AyFfqeF7uJ3D5hlpX2nI9no/ugPrrTVoVZAgrrnNz0iZG2DVx46 x913pVKHl5mlYQARAQABwsFfBBgBAgAJBQJafgNKAhsMAAoJELKItV//nCLBwNIP/AiIHE8b oIqReFQyaMzxq6lE4YZCZNj65B/nkDOvodSiwfwjjVVE2V3iEzxMHbgyTCGA67+Bo/d5aQGj gn0TPtsGzelyQHipaUzEyrsceUGWYoKXYyVWKEfyh0cDfnd9diAm3VeNqchtcMpoehETH8fr RHnJdBcjf112PzQSdKC6kqU0Q196c4Vp5HDOQfNiDnTf7gZSj0BraHOByy9LEDCLhQiCmr+2 E0rW4tBtDAn2HkT9uf32ZGqJCn1O+2uVfFhGu6vPE5qkqrbSE8TG+03H8ecU2q50zgHWPdHM OBvy3EhzfAh2VmOSTcRK+tSUe/u3wdLRDPwv/DTzGI36Kgky9MsDC5gpIwNbOJP2G/q1wT1o Gkw4IXfWv2ufWiXqJ+k7HEi2N1sree7Dy9KBCqb+ca1vFhYPDJfhP75I/VnzHVssZ/rYZ9+5 1yDoUABoNdJNSGUYl+Yh9Pw9pE3Kt4EFzUlFZWbE4xKL/NPno+z4J9aWemLLszcYz/u3XnbO vUSQHSrmfOzX3cV4yfmjM5lewgSstoxGyTx2M8enslgdXhPthZlDnTnOT+C+OTsh8+m5tos8 HQjaPM01MKBiAqdPgksm1wu2DrrwUi6ChRVTUBcj6+/9IJ81H2P2gJk3Ls3AVIxIffLoY34E +MYSfkEjBz0E8CLOcAw7JIwAaeBT In-Reply-To: <875x1x6f9o.fsf@alyssa.is> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------lkYbvYw9Q3JE9PyJtvAa9kp2" Message-ID-Hash: O7UR4X45K5H76UBFNXQL5GWIA27Y3C4M X-Message-ID-Hash: O7UR4X45K5H76UBFNXQL5GWIA27Y3C4M X-MailFrom: demiobenour@gmail.com X-Mailman-Rule-Hits: member-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; header-match-devel.spectrum-os.org-0; header-match-devel.spectrum-os.org-1; header-match-devel.spectrum-os.org-2; header-match-devel.spectrum-os.org-3; header-match-devel.spectrum-os.org-4; emergency CC: Spectrum OS Development X-Mailman-Version: 3.3.10 Precedence: list List-Id: Patches and low-level development discussion Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------lkYbvYw9Q3JE9PyJtvAa9kp2 Content-Type: multipart/mixed; boundary="------------8SGRDxfPFlwlpS6dlWGLVPv6"; protected-headers="v1"; hp="clear" Message-ID: Date: Wed, 29 Jul 2026 16:20:18 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 09/20] host/rootfs: Set up parent cgroup for all per-VM services To: Alyssa Ross Cc: Spectrum OS Development References: <20260721-cgroups-v4-0-46b2e5fff7b6@gmail.com> <20260721-cgroups-v4-9-46b2e5fff7b6@gmail.com> <871pcoljat.fsf@alyssa.is> <875x1x6f9o.fsf@alyssa.is> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; 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charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 7/29/26 10:29, Alyssa Ross wrote: > Demi Marie Obenour writes: >=20 >> On 7/27/26 08:16, Alyssa Ross wrote: >>> Demi Marie Obenour writes: >>> >>>> Signed-off-by: Demi Marie Obenour >>>> --- >>>> host/rootfs/image/etc/s6-linux-init/run-image/service/vm-services/r= un | 3 +++ >>>> 1 file changed, 3 insertions(+) >>>> >>>> diff --git a/host/rootfs/image/etc/s6-linux-init/run-image/service/v= m-services/run b/host/rootfs/image/etc/s6-linux-init/run-image/service/vm= -services/run >>>> index 78f794202bf174f3c036f3e20755ac087a988277..430065b1efae8ce1fe7c= 7a07b67920daa88bf98c 100755 >>>> --- a/host/rootfs/image/etc/s6-linux-init/run-image/service/vm-servi= ces/run >>>> +++ b/host/rootfs/image/etc/s6-linux-init/run-image/service/vm-servi= ces/run >>>> @@ -1,5 +1,8 @@ >>>> #!/bin/execlineb -WP >>>> # SPDX-License-Identifier: EUPL-1.2+ >>>> # SPDX-FileCopyrightText: 2023 Alyssa Ross >>>> +# SPDX-FileCopyrightText: 2026 Demi Marie Obenour >>>> =20 >>>> +# Set up the parent cgroup of all VMMs and VM services >>>> +cgroup-setup --no-wait -- /vm-services.slice >>>> s6-svscan -d3 instance >>> >>> We wouldn't want to wait if vm-services was restarted? (I'm not sure= >>> either way, would just like to read the reasoning.) >> >> cgroup-setup waits for the cgroup *and all of its transitive child >> cgroups* to become empty. Therefore, waiting would block until all >> VMMs had exited and all of their services had stopped. >> >> Even if it only waited on /vm-service.slice/$inner.service to become >> empty, it would still wait for all of the s6-supervise processes in >> that cgroup to exit. That's unlikely to ever happen. >> >> Running more than one instance of s6-svscan (or s6-supervise) is >> harmless: the program immediately exits with status 100. That will >> cause it to be restarted indefinitely, consuming CPU. However, I >> don't know a good alternative unless s6 gets support for bind-mounted >> pidfds, allowing s6-svscan and s6-supervise to keep track of child >> processes across restarts. >=20 > Why is this different to the top-level vmm service? It also just runs > s6-svscan, but it does not use --no-wait. It is different because this one is correct and the other is wrong :). --=20 Sincerely, Demi Marie Obenour (she/her/hers) --------------8SGRDxfPFlwlpS6dlWGLVPv6-- --------------lkYbvYw9Q3JE9PyJtvAa9kp2 Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEopQtqVJW1aeuo9/sszaHOrMp8lMFAmpqYIIACgkQszaHOrMp 8lPUQQ/+JyAQdeCVhRfOpcYMLgbwo9/izDvF/4FRKAbUOPuWUobQ7xpmzfb2Fqus mXAPjyzA1H/V8Jgkozj1ZsRiD+6d/EjmN5eEeD4xrH4m4jdqx8HWlwiK2GCfdzHr CoYyIyfC+dHSF7Q2HX1RIy5MGwRbsAg6Owq8znRjsmXrCqGQ93x0PmJqr6bze/WU eLkUKUcf0Thh0s1R9qLJhrQr9fEXxzvhD4BHfUbGeKXcmiodHamVNnWSJVo/xHcX 1MaCY1VTWw8mIGAtj+qbcBG27td2T+UTcYhBncTp/G33Jt4UVK36JPiRzhbKkJEN YpGunJQXtEJTW/7/S9ZhnxMxRqUfLhzc0uLrFvwxMAEg/WARJQr0QsNpUCQK5DsD QAob52cxRjUDY+cDtDs/c/3XaUt2mnPYwhVnBTO58jrSwlVOH6aVC0xyhuQVxHSM 0GMS6RYiURDqjSf/zZwBppJSubXy8R5W2oeLmb+mAoDN2HILZKdl/iURmDf5DSLn DseEiUGXHV1FYLFoE9H88ezRwY39aAcMvdLjzgRZnkOwfXfXSNKwanx++JOQbhZv rB6n1gLj1eBF7Qj6U6YM2hEvrpPmWCdMO2hkgdsoXopIJ0dTpgbzLIzJ2aZAzx/4 T4+hbiv8uo/g9PvqbxRV9CqkHmW8h1gYjP+JMx2nW37Jd586HrI= =5j4W -----END PGP SIGNATURE----- --------------lkYbvYw9Q3JE9PyJtvAa9kp2--