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b=pjUkmMDwkcvKatGk2wDqkvCGcyWHNBZXoM1rLtXyrM18qlysWdGoGiLuZBN0rSgybnbvSSy092YtT6UtycD/yHtqUBXlmEYYV6AeLIl7veITAZLYVxHcubfXQbYuI+WkHzda6jl+IzN27UXxKT+yN9Cfp1IY1SgMaegwasH2ed4= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from IA0PPF9A76BB3A6.namprd12.prod.outlook.com (2603:10b6:20f:fc04::bdc) by SJ2PR12MB8720.namprd12.prod.outlook.com (2603:10b6:a03:539::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8989.18; Wed, 6 Aug 2025 21:19:29 +0000 Received: from IA0PPF9A76BB3A6.namprd12.prod.outlook.com ([fe80::bed0:97a3:545d:af16]) by IA0PPF9A76BB3A6.namprd12.prod.outlook.com ([fe80::bed0:97a3:545d:af16%7]) with mapi id 15.20.8989.011; Wed, 6 Aug 2025 21:19:29 +0000 Message-ID: Date: Wed, 6 Aug 2025 16:19:25 -0500 User-Agent: Mozilla Thunderbird Reply-To: babu.moger@amd.com Subject: Re: [PATCH v16 13/34] fs/resctrl: Introduce interface to display number of free MBM counters To: corbet@lwn.net, tony.luck@intel.com, reinette.chatre@intel.com, james.morse@arm.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com Cc: Dave.Martin@arm.com, x86@kernel.org, hpa@zytor.com, akpm@linux-foundation.org, paulmck@kernel.org, rostedt@goodmis.org, Neeraj.Upadhyay@amd.com, david@redhat.com, arnd@arndb.de, fvdl@google.com, seanjc@google.com, jpoimboe@kernel.org, pawan.kumar.gupta@linux.intel.com, xin@zytor.com, manali.shukla@amd.com, tao1.su@linux.intel.com, sohil.mehta@intel.com, kai.huang@intel.com, xiaoyao.li@intel.com, peterz@infradead.org, xin3.li@intel.com, kan.liang@linux.intel.com, mario.limonciello@amd.com, thomas.lendacky@amd.com, perry.yuan@amd.com, gautham.shenoy@amd.com, chang.seok.bae@intel.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, peternewman@google.com, eranian@google.com References: <9e805169d3fbc889a89b283d074a5dff23cb0e94.1753467772.git.babu.moger@amd.com> Content-Language: en-US From: "Moger, Babu" In-Reply-To: <9e805169d3fbc889a89b283d074a5dff23cb0e94.1753467772.git.babu.moger@amd.com> Content-Type: text/plain; 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> Added missing rdt_last_cmd_clear() in resctrl_available_mbm_cntrs_show(). > > v11: Rename rdtgroup_available_mbm_cntrs_show() to resctrl_available_mbm_cntrs_show(). > Few minor text changes. > > v10: Patch changed to handle the counters at domain level. > https://lore.kernel.org/lkml/CALPaoCj+zWq1vkHVbXYP0znJbe6Ke3PXPWjtri5AFgD9cQDCUg@mail.gmail.com/ > So, display logic also changed now. > > v9: New patch > --- > Documentation/filesystems/resctrl.rst | 11 ++++++ > fs/resctrl/monitor.c | 2 ++ > fs/resctrl/rdtgroup.c | 48 +++++++++++++++++++++++++++ > 3 files changed, 61 insertions(+) > > diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst > index 4eb27530be6f..446736dbd97f 100644 > --- a/Documentation/filesystems/resctrl.rst > +++ b/Documentation/filesystems/resctrl.rst > @@ -299,6 +299,17 @@ with the following files: > # cat /sys/fs/resctrl/info/L3_MON/num_mbm_cntrs > 0=32;1=32 > > +"available_mbm_cntrs": > + The number of counters available for assignment in each domain when mbm_event > + mode is enabled on the system. > + > + For example, on a system with 30 available [hardware] assignable counters > + in each of its L3 domains: > + :: > + > + # cat /sys/fs/resctrl/info/L3_MON/available_mbm_cntrs > + 0=30;1=30 > + > "max_threshold_occupancy": > Read/write file provides the largest value (in > bytes) at which a previously used LLC_occupancy > diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c > index 4539b08db7b9..a0b0ea45c7b4 100644 > --- a/fs/resctrl/monitor.c > +++ b/fs/resctrl/monitor.c > @@ -931,6 +931,8 @@ int resctrl_mon_resource_init(void) > resctrl_enable_mon_event(QOS_L3_MBM_LOCAL_EVENT_ID); > resctrl_file_fflags_init("num_mbm_cntrs", > RFTYPE_MON_INFO | RFTYPE_RES_CACHE); > + resctrl_file_fflags_init("available_mbm_cntrs", > + RFTYPE_MON_INFO | RFTYPE_RES_CACHE); > } > > return 0; > diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c > index a09566720d4f..15d10c346307 100644 > --- a/fs/resctrl/rdtgroup.c > +++ b/fs/resctrl/rdtgroup.c > @@ -1853,6 +1853,48 @@ static int resctrl_num_mbm_cntrs_show(struct kernfs_open_file *of, > return 0; > } > > +static int resctrl_available_mbm_cntrs_show(struct kernfs_open_file *of, > + struct seq_file *s, void *v) > +{ > + struct rdt_resource *r = rdt_kn_parent_priv(of->kn); > + struct rdt_mon_domain *dom; > + bool sep = false; > + u32 cntrs, i; > + int ret = 0; > + > + cpus_read_lock(); > + mutex_lock(&rdtgroup_mutex); > + > + rdt_last_cmd_clear(); > + > + if (!resctrl_arch_mbm_cntr_assign_enabled(r)) { > + rdt_last_cmd_puts("mbm_event mode is not enabled\n"); > + ret = -EINVAL; > + goto out_unlock; > + } > + > + list_for_each_entry(dom, &r->mon_domains, hdr.list) { > + if (sep) > + seq_putc(s, ';'); > + > + cntrs = 0; > + for (i = 0; i < r->mon.num_mbm_cntrs; i++) { > + if (!dom->cntr_cfg[i].rdtgrp) > + cntrs++; > + } > + > + seq_printf(s, "%d=%u", dom->hdr.id, cntrs); > + sep = true; > + } > + seq_putc(s, '\n'); > + > +out_unlock: > + mutex_unlock(&rdtgroup_mutex); > + cpus_read_unlock(); > + > + return ret; > +} > + This also can be moved to monitor.c. What do you think? > /* rdtgroup information files for one cache resource. */ > static struct rftype res_common_files[] = { > { > @@ -1876,6 +1918,12 @@ static struct rftype res_common_files[] = { > .seq_show = rdt_mon_features_show, > .fflags = RFTYPE_MON_INFO, > }, > + { > + .name = "available_mbm_cntrs", > + .mode = 0444, > + .kf_ops = &rdtgroup_kf_single_ops, > + .seq_show = resctrl_available_mbm_cntrs_show, > + }, > { > .name = "num_rmids", > .mode = 0444, -- Thanks Babu Moger