From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id F0BE1CD5BB3 for ; Fri, 22 May 2026 16:48:41 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 16A576B00B4; Fri, 22 May 2026 12:48:41 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 142CC6B00B5; Fri, 22 May 2026 12:48:41 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 07F346B00BB; Fri, 22 May 2026 12:48:41 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id EBCB26B00B4 for ; Fri, 22 May 2026 12:48:40 -0400 (EDT) Received: from smtpin05.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 4A8AB1405E6 for ; Fri, 22 May 2026 16:48:40 +0000 (UTC) X-FDA: 84795639600.05.AD72381 Received: from mail-wr1-f44.google.com (mail-wr1-f44.google.com [209.85.221.44]) by imf28.hostedemail.com (Postfix) with ESMTP id 39B06C000A for ; Fri, 22 May 2026 16:48:37 +0000 (UTC) Authentication-Results: imf28.hostedemail.com; dkim=pass header.d=suse.com header.s=google header.b=LTp8f4Da; spf=pass (imf28.hostedemail.com: domain of mkoutny@suse.com designates 209.85.221.44 as permitted sender) smtp.mailfrom=mkoutny@suse.com; dmarc=pass (policy=quarantine) header.from=suse.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1779468518; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=RkkB0hffRR69qMLvhInPQn8c5SMOFLnLZE8s1HedbWk=; b=aOzRNMbuquy58nqsAxyp0R2+JyO2F4D0eQ9BqiHhSZl9gnophdgrkL9PmDpUq8SvtyFCIA S/etYIi7BDCTA6e2A2SQAL1R39chu1A0+ajIj0fo01aYFdMsmR/ghgzjBWLoX0Sn7E2vg3 dF+CwxUigPJVFyXE+UQa7r/VEIDlF58= ARC-Authentication-Results: i=1; imf28.hostedemail.com; dkim=pass header.d=suse.com header.s=google header.b=LTp8f4Da; spf=pass (imf28.hostedemail.com: domain of mkoutny@suse.com designates 209.85.221.44 as permitted sender) smtp.mailfrom=mkoutny@suse.com; dmarc=pass (policy=quarantine) header.from=suse.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1779468518; a=rsa-sha256; cv=none; b=Rob1lJox/V0Z3VgqM6W9ekqQFmE+CTVsQggVaqQV4qGHDKEwaVlRulXATEUA0ElZ48KyJ4 R14z7RHEaGTQCTMir3bTbOZgWQqNJALNnYp4xFGYGsrQXlrAwS2Qx/ACYvsKcbIxi73+D5 EXhjOxJHak6CyQxsf+LVORX8d3T9j7I= Received: by mail-wr1-f44.google.com with SMTP id ffacd0b85a97d-43d7645adbdso5120443f8f.1 for ; Fri, 22 May 2026 09:48:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1779468516; x=1780073316; darn=kvack.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=RkkB0hffRR69qMLvhInPQn8c5SMOFLnLZE8s1HedbWk=; b=LTp8f4DaGTmeoSLL5bc4Gc7UL7H7qBYbLLtmX82vneKIS+25/Pof7wX1aSuO7Eytwt OmG/7lxEvV7qaKLDtd36TXM5vPDWv4uVrrK471rnAUXOS0e32eGnQxueUHMFvKYQURel lBKzin4CpJXZ+/OV7Qx5tsQqxbpbgvnmQHXjirmzC/aOwnLhcRDtltdkq8i6zj1N6MrV LjU8thtvMxyrATl1KAAPY4+XHrET65Qy866ylluM99l4BeOIxjau3ghTYBKbavD62FUb 6Va8DVDHnpGf609MF/cO/FVaegsAB5vt8t/NYWcGkMyci/nF/LnRzKizMaF5WLgk92Z1 8MIA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779468516; x=1780073316; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=RkkB0hffRR69qMLvhInPQn8c5SMOFLnLZE8s1HedbWk=; b=aPXx6tSFblpdN6zY08am+Q7hhTQxgCZ/PQ3afy8bd1i21nJLZOBD6/Q0X4vyRQVpwF e9GAcw5sHH09BHqH4YvG6KHvTShrls+RxGjWxfbhNvSq3I1GS9p9z+HryuX2ks5SdIYu brerttRu+3CuWLPXjz4EUdGwiFYychdxjozYKz7M/3fxs4iEx38yhho2ranjS2waMVFf wi+3GmDJZEJWtgllrEdgxSpiQEpqxtlIayobgkkUuEC4OZgxN5TphB95BayvZqWZY9+z GNYmm7tgk+QfqT5As4I7eZMiaKiZELEPnLUNyxhRfZ7gQmguMl7fycDk9Sw2uxkTQPBA DTyw== X-Forwarded-Encrypted: i=1; AFNElJ9N+BkwNgMiTiohFYwboiVupS4CkEblvhPsjERIxFmNGS9xHaPbKXQvxotNzIpHdRv2DLuPDgyGFA==@kvack.org X-Gm-Message-State: AOJu0Yw3IY2kJWD7hhCZ+o+OuLCxytXxT84tvjAbEwK/vbNc8n12EFvd curiTRr28s3rG83ZP7b4jJB3ikICCH3yLRxTSfEhXwAXNzCtErJ6P5jUCt85hVETazU= X-Gm-Gg: Acq92OEs6nUQ0l4KtnB1ycoibQ3snxxHcspbwiVhSmTLG8Mo+Jom99M7ZGF3O9cWgzY pdL18FsX+prwXDCGacBep8V2jt8Z8LoouB05g/qjPvfRtxR/bSWvtBr+32GmHG9xn3CaOmhe8Jk He0aexSbc/9rQm1XWDFZhTgYSi93Ii2W248cz7HJpaQIVhV8GxyeQjBMrCKzu3mCXWu41Xhi+Qt E574gTV2Z7vaTJ6TLqC4pd/ecu/omsGypANS4d2sBpbUXoyH30bNkkJsYEhsr+AlFxjekUR9N00 nlFTFDzSe3YdZLxRWNqn+NR+TiW//Pe5RoNfbl1qM+/a/dbH16PA7vzPOVWwtqnBeerkOOJJKDS 5ZEOdeWdtNjUVQO8ilasnv00Cq3WgunzWZwXmousSNo8wpUixJgFnFcSzosKaIN6aVE1JU8UWF3 UT+nTG5cHn1dvrmau6f4J7FsqD2xvno0QfhCnLUGTJfOzZPB1z X-Received: by 2002:a05:6000:4283:b0:45d:8c16:5566 with SMTP id ffacd0b85a97d-45eb38baadbmr7082103f8f.18.1779468516497; Fri, 22 May 2026 09:48:36 -0700 (PDT) Received: from localhost.localdomain (nat2.prg.suse.com. [195.250.132.146]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45eb6d70d89sm5769908f8f.37.2026.05.22.09.48.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 May 2026 09:48:35 -0700 (PDT) Date: Fri, 22 May 2026 18:48:33 +0200 From: Michal =?utf-8?Q?Koutn=C3=BD?= To: Thadeu Lima de Souza Cascardo Cc: Tejun Heo , Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Andrew Morton , Jonathan Corbet , Shuah Khan , Maarten Lankhorst , Maxime Ripard , Natalie Vock , Tvrtko Ursulin , cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, dri-devel@lists.freedesktop.org, kernel-dev@igalia.com Subject: Re: [PATCH v3] cgroup/dmem: introduce a peak file Message-ID: References: <20260514-dmem_peak-v3-1-b64ce5d3ac38@igalia.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="27zcqpjzhteuelt3" Content-Disposition: inline In-Reply-To: <20260514-dmem_peak-v3-1-b64ce5d3ac38@igalia.com> X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 39B06C000A X-Stat-Signature: 7h6ncot8x76hdnsird4migtc53unqmkf X-HE-Tag: 1779468517-984995 X-HE-Meta: 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 QRcwmJNq 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: --27zcqpjzhteuelt3 Content-Type: text/plain; protected-headers=v1; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: [PATCH v3] cgroup/dmem: introduce a peak file MIME-Version: 1.0 On Thu, May 14, 2026 at 02:36:08PM -0300, Thadeu Lima de Souza Cascardo wrote: > Just like we have memory.peak, introduce a dmem.peak, which uses the > page_counter support for that. >=20 > For now, make it read-only. >=20 > This allows for memory usage monitoring without polling dmem.current when > the information needed is the maximum device memory used. That can be used > for capacity planning, such that dmem.max can be properly setup for a giv= en > workload. It can also be used for debugging to determine whether a given > workload would have caused eviction or system memory use. >=20 > Signed-off-by: Thadeu Lima de Souza Cascardo > --- > Changes in v3: > - EDITME: describe what is new in this series revision. > - EDITME: use bulletpoints and terse descriptions. > - Link to v2: https://patch.msgid.link/20260513-dmem_peak-v2-1-dac06999db= 9e@igalia.com >=20 > Changes in v2: > - Make it read-only for now and adjust documentation accordingly. > - Link to v1: https://patch.msgid.link/20260506-dmem_peak-v1-0-8d803eb344= 9c@igalia.com > --- > Documentation/admin-guide/cgroup-v2.rst | 6 ++++++ > kernel/cgroup/dmem.c | 15 +++++++++++++++ > 2 files changed, 21 insertions(+) >=20 > diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admi= n-guide/cgroup-v2.rst > index 6efd0095ed99..d103623b2be4 100644 > --- a/Documentation/admin-guide/cgroup-v2.rst > +++ b/Documentation/admin-guide/cgroup-v2.rst > @@ -2808,6 +2808,12 @@ DMEM Interface Files > The semantics are the same as for the memory cgroup controller, and are > calculated in the same way. > =20 > + dmem.peak > + A read-only nested-keyed file that exists on non-root cgroups. s/nested-keyed/flat-keyed/ With that Reviewed-by: Michal Koutn=FD --27zcqpjzhteuelt3 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iJEEABYKADkWIQRCE24Fn/AcRjnLivR+PQLnlNv4CAUCahCI3RsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMiwyLDIACgkQfj0C55Tb+Ah3WAEA8jNoGbM+jfh2AQM8AaCh AP+xdJvR4lj+FHVIyhs6qukA/0scDz7iwckNV/NU40VipKTbHw6vIv1Uo6Y97PJu d5kF =dGdF -----END PGP SIGNATURE----- --27zcqpjzhteuelt3--