From nobody Sat Feb 7 12:56:10 2026 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8C63415E1FB for ; Wed, 15 May 2024 22:23:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.15 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715811824; cv=none; b=glHP9Z9NA4zO3GaYWQ+V+ya8Yx8wxthkHqHUSwk766881H2FktBhm6Ijb+SMdZ81g//KLvajX9Wmhg9JM+g8X/2SgU/l6eqy3MjDGr9A8ca169Yh9YAWJ31/9NXCtnlzGWGvF4Ti/EdxXW7bMnq+w+Ih6L4POPGlQoAeAT7sHyM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715811824; c=relaxed/simple; bh=CxlBAzC3oiMt0w8Uxso1tlSURq0X7jXxxDfSzggd0ys=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rYNuiCdaLXB03u0YcBs6tsHqLevFapeEk89uYje5EBPPdDYeDsQHsLXjM3lE4TJtzst1cq8HebbQ/f/+OlYSWlO9uYHba+7FB6PQN86JBcUUrobIssjBPsGbISpQAnGoABnSIzmr91yl5Qw9mXK8PxG6rKk9dTKOFdLleqd4cIg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=T//wJ9VO; arc=none smtp.client-ip=198.175.65.15 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="T//wJ9VO" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1715811823; x=1747347823; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=CxlBAzC3oiMt0w8Uxso1tlSURq0X7jXxxDfSzggd0ys=; b=T//wJ9VOwWfPzVbrcR/z9fKLtR2MOxSaolAgN/KXvGrjIVSPlCulhvMS SazcGG0J9jZ1WsAnrBWVMLVgPO9/NovaUPRBc2ra1jb5AtmTgQpkZdRhn iCHGEk+Gl5Lbpi32P/7+RrpUlkHlanUyTU7BATnBHsWolZSEGSVDZU8eK uZRZu8yBhegPl46KWTqs2t1h+5XDsJJxAhnjRpF0UfHLFP2KTI1FqSIrG NMhuqXUtPmpZukODnC6COeoX42VQDqEt+Z0XKrYqYe/UYptZpm8u4xMjD r1SlRB6HquOS3siyHGtydBoK/nMXZe10QZm1uTfoEh+MwbnqCjUBjjK9E A==; X-CSE-ConnectionGUID: ed7kdwP4Q0+zR3nup8lebg== X-CSE-MsgGUID: gJYoPoEQS9+S4hzkwW+YCA== X-IronPort-AV: E=McAfee;i="6600,9927,11074"; a="15671692" X-IronPort-AV: E=Sophos;i="6.08,162,1712646000"; d="scan'208";a="15671692" Received: from orviesa005.jf.intel.com ([10.64.159.145]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 May 2024 15:23:36 -0700 X-CSE-ConnectionGUID: jHmzwz3ASDG2wl1IzM9zuA== X-CSE-MsgGUID: Av5e/HR1SBa1u6gXbppfsQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,162,1712646000"; d="scan'208";a="35989183" Received: from agluck-desk3.sc.intel.com ([172.25.222.105]) by orviesa005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 May 2024 15:23:36 -0700 From: Tony Luck To: Fenghua Yu , Reinette Chatre , Maciej Wieczor-Retman , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin Cc: x86@kernel.org, linux-kernel@vger.kernel.org, patches@lists.linux.dev, Tony Luck Subject: [PATCH v18 12/17] x86/resctrl: Create Sub-NUMA (SNC) monitor files Date: Wed, 15 May 2024 15:23:20 -0700 Message-ID: <20240515222326.74166-13-tony.luck@intel.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240515222326.74166-1-tony.luck@intel.com> References: <20240515222326.74166-1-tony.luck@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When SNC mode is enabled, create subdirectories and file to monitor at the SNC node granularity. Monitor files at the L3 granularity are tagged with a "sum" attribute to indicate that all SNC nodes sharing an L3 cache should be read and summed to provide the result to the user. Note that the "domid" field for files that must sum across SNC domains has the L3 cache instance id, while non-summing files use the domain id. Also the "sum" files do not need to make a call to mon_event_read() to initialize the MBM counters. This will be handled by initializing the individual SNC nodes that share the L3. Signed-off-by: Tony Luck --- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 53 ++++++++++++++++++-------- 1 file changed, 38 insertions(+), 15 deletions(-) diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r= esctrl/rdtgroup.c index 7a6c40aefdcc..f0f468babdea 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -3026,7 +3026,8 @@ static void rmdir_mondata_subdir_allrdtgrp(struct rdt= _resource *r, } =20 static int mon_add_all_files(struct kernfs_node *kn, struct rdt_mon_domain= *d, - struct rdt_resource *r, struct rdtgroup *prgrp) + struct rdt_resource *r, struct rdtgroup *prgrp, + bool do_sum) { union mon_data_bits priv; struct mon_evt *mevt; @@ -3037,15 +3038,18 @@ static int mon_add_all_files(struct kernfs_node *kn= , struct rdt_mon_domain *d, return -EPERM; =20 priv.u.rid =3D r->rid; - priv.u.domid =3D d->hdr.id; + priv.u.domid =3D do_sum ? d->display_id : d->hdr.id; + priv.u.sum =3D do_sum; list_for_each_entry(mevt, &r->evt_list, list) { priv.u.evtid =3D mevt->evtid; ret =3D mon_addfile(kn, mevt->name, priv.priv); if (ret) return ret; =20 - if (is_mbm_event(mevt->evtid)) + if (!do_sum && is_mbm_event(mevt->evtid)) { + rr.sumdomains =3D 0; mon_event_read(&rr, r, d, prgrp, mevt->evtid, true); + } } =20 return 0; @@ -3055,23 +3059,42 @@ static int mkdir_mondata_subdir(struct kernfs_node = *parent_kn, struct rdt_mon_domain *d, struct rdt_resource *r, struct rdtgroup *prgrp) { - struct kernfs_node *kn; + struct kernfs_node *kn, *ckn; char name[32]; + bool do_sum; int ret; =20 - sprintf(name, "mon_%s_%02d", r->name, d->hdr.id); - /* create the directory */ - kn =3D kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp); - if (IS_ERR(kn)) - return PTR_ERR(kn); + do_sum =3D r->mon_scope !=3D r->mon_display_scope; + sprintf(name, "mon_%s_%02d", r->name, d->display_id); + kn =3D kernfs_find_and_get_ns(parent_kn, name, NULL); + if (!kn) { + /* create the directory */ + kn =3D kernfs_create_dir(parent_kn, name, parent_kn->mode, prgrp); + if (IS_ERR(kn)) + return PTR_ERR(kn); =20 - ret =3D rdtgroup_kn_set_ugid(kn); - if (ret) - goto out_destroy; + ret =3D rdtgroup_kn_set_ugid(kn); + if (ret) + goto out_destroy; + ret =3D mon_add_all_files(kn, d, r, prgrp, do_sum); + if (ret) + goto out_destroy; + } =20 - ret =3D mon_add_all_files(kn, d, r, prgrp); - if (ret) - goto out_destroy; + if (do_sum) { + sprintf(name, "mon_sub_%s_%02d", r->name, d->hdr.id); + ckn =3D kernfs_create_dir(kn, name, parent_kn->mode, prgrp); + if (IS_ERR(ckn)) + goto out_destroy; + + ret =3D rdtgroup_kn_set_ugid(ckn); + if (ret) + goto out_destroy; + + ret =3D mon_add_all_files(ckn, d, r, prgrp, false); + if (ret) + goto out_destroy; + } =20 kernfs_activate(kn); return 0; --=20 2.44.0