diff options
| -rw-r--r-- | Documentation/filesystems/resctrl.rst | 11 | ||||
| -rw-r--r-- | fs/resctrl/internal.h | 3 | ||||
| -rw-r--r-- | fs/resctrl/monitor.c | 44 | ||||
| -rw-r--r-- | fs/resctrl/rdtgroup.c | 6 |
4 files changed, 64 insertions, 0 deletions
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/internal.h b/fs/resctrl/internal.h index 7a12187eced8..4f372e80bf37 100644 --- a/fs/resctrl/internal.h +++ b/fs/resctrl/internal.h @@ -388,6 +388,9 @@ int resctrl_mbm_assign_mode_show(struct kernfs_open_file *of, struct seq_file *s int resctrl_num_mbm_cntrs_show(struct kernfs_open_file *of, struct seq_file *s, void *v); +int resctrl_available_mbm_cntrs_show(struct kernfs_open_file *of, struct seq_file *s, + void *v); + #ifdef CONFIG_RESCTRL_FS_PSEUDO_LOCK int rdtgroup_locksetup_enter(struct rdtgroup *rdtgrp); diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c index 112979e9c444..1fa82a62b2e5 100644 --- a/fs/resctrl/monitor.c +++ b/fs/resctrl/monitor.c @@ -936,6 +936,48 @@ int resctrl_num_mbm_cntrs_show(struct kernfs_open_file *of, return 0; } +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 counter assignment 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; +} + /** * resctrl_mon_resource_init() - Initialise global monitoring structures. * @@ -983,6 +1025,8 @@ 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 61f7b68f2273..2e1d0a2703da 100644 --- a/fs/resctrl/rdtgroup.c +++ b/fs/resctrl/rdtgroup.c @@ -1823,6 +1823,12 @@ static struct rftype res_common_files[] = { .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, .kf_ops = &rdtgroup_kf_single_ops, |