Hi Fenghua, On 9/11/23 13:14, Fenghua Yu wrote: > Hi, Babu, > > On 9/7/23 16:51, Babu Moger wrote: >> In x86, hardware uses RMID to identify a a monitoring group. When a > > s/a a/a/ Sure. Thanks for the review. Reinette has already addressed other comments. Thanks Babu > >> user creates a monitor group these details are not visible. These details >> can help resctrl debugging. >> >> Add RMID(mon_hw_id) to the monitor groups display in resctrl interface. >> Users can see these details when resctrl is mounted with "-o debug" option. >> >> Other architectures do not use "RMID". Use the name mon_hw_id to refer >> to "RMID" in an effort to keep the naming generic. >> >> Add the flag RFTYPE_MON_BASE, which contains the files required only >> for the MON group. >> >> For example: >> $cat /sys/fs/resctrl/mon_groups/mon_grp1/mon_hw_id >> 3 >> >> Signed-off-by: Babu Moger <babu.moger@xxxxxxx> >> --- >> Documentation/arch/x86/resctrl.rst | 4 +++ >> arch/x86/kernel/cpu/resctrl/internal.h | 6 ++++ >> arch/x86/kernel/cpu/resctrl/rdtgroup.c | 38 +++++++++++++++++++++++--- >> 3 files changed, 44 insertions(+), 4 deletions(-) >> >> diff --git a/Documentation/arch/x86/resctrl.rst >> b/Documentation/arch/x86/resctrl.rst >> index 54691c8b832d..98b0eb509ed4 100644 >> --- a/Documentation/arch/x86/resctrl.rst >> +++ b/Documentation/arch/x86/resctrl.rst >> @@ -369,6 +369,10 @@ When monitoring is enabled all MON groups will also >> contain: >> the sum for all tasks in the CTRL_MON group and all tasks in >> MON groups. Please see example section for more details on usage. >> +"mon_hw_id": >> + Available only with debug option. The identifier used by hardware >> + for the monitor group. On x86 this is the RMID. >> + >> Resource allocation rules >> ------------------------- >> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h >> b/arch/x86/kernel/cpu/resctrl/internal.h >> index ccdbed615d41..b4910892b0a6 100644 >> --- a/arch/x86/kernel/cpu/resctrl/internal.h >> +++ b/arch/x86/kernel/cpu/resctrl/internal.h >> @@ -296,6 +296,11 @@ struct rdtgroup { >> * --> RFTYPE_BASE (Files common for both MON and CTRL groups) >> * Files: cpus, cpus_list, tasks >> * >> + * --> RFTYPE_MON (Files only for MON group) >> + * >> + * --> RFTYPE_DEBUG (Files to help resctrl debugging) >> + * File: mon_hw_id >> + * >> * --> RFTYPE_CTRL (Files only for CTRL group) >> * Files: mode, schemata, size >> * >> @@ -315,6 +320,7 @@ struct rdtgroup { >> #define RFTYPE_MON_INFO (RFTYPE_INFO | RFTYPE_MON) >> #define RFTYPE_TOP_INFO (RFTYPE_INFO | RFTYPE_TOP) >> #define RFTYPE_CTRL_BASE (RFTYPE_BASE | RFTYPE_CTRL) >> +#define RFTYPE_MON_BASE (RFTYPE_BASE | RFTYPE_MON) >> /* List of all resource groups */ >> extern struct list_head rdt_all_groups; >> diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c >> b/arch/x86/kernel/cpu/resctrl/rdtgroup.c >> index 8be0fb323ad3..fc830ffce82a 100644 >> --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c >> +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c >> @@ -795,6 +795,22 @@ static int rdtgroup_closid_show(struct >> kernfs_open_file *of, >> return ret; >> } >> +static int rdtgroup_rmid_show(struct kernfs_open_file *of, >> + struct seq_file *s, void *v) >> +{ >> + struct rdtgroup *rdtgrp; >> + int ret = 0; >> + >> + rdtgrp = rdtgroup_kn_lock_live(of->kn); >> + if (rdtgrp) >> + seq_printf(s, "%u\n", rdtgrp->mon.rmid); >> + else >> + ret = -ENOENT; >> + rdtgroup_kn_unlock(of->kn); >> + >> + return ret; >> +} >> + >> #ifdef CONFIG_PROC_CPU_RESCTRL >> /* >> @@ -1856,6 +1872,13 @@ static struct rftype res_common_files[] = { >> .seq_show = rdtgroup_tasks_show, >> .fflags = RFTYPE_BASE, >> }, >> + { >> + .name = "mon_hw_id", >> + .mode = 0444, >> + .kf_ops = &rdtgroup_kf_single_ops, >> + .seq_show = rdtgroup_rmid_show, > > Similar to showing ctrl_hw_id, is it better to rename "rdtgroup_rmid_show" > as "rdtgroup_mon_hw_id_show" for arch neutral naming? > >> + .fflags = RFTYPE_MON_BASE | RFTYPE_DEBUG, >> + }, >> { >> .name = "schemata", >> .mode = 0644, >> @@ -2535,6 +2558,7 @@ static void schemata_list_destroy(void) >> static int rdt_get_tree(struct fs_context *fc) >> { >> struct rdt_fs_context *ctx = rdt_fc2context(fc); >> + unsigned long flags = RFTYPE_CTRL_BASE; >> struct rdt_domain *dom; >> struct rdt_resource *r; >> int ret; >> @@ -2565,7 +2589,10 @@ static int rdt_get_tree(struct fs_context *fc) >> closid_init(); >> - ret = rdtgroup_add_files(rdtgroup_default.kn, RFTYPE_CTRL_BASE); >> + if (rdt_mon_capable) >> + flags |= RFTYPE_MON; >> + >> + ret = rdtgroup_add_files(rdtgroup_default.kn, flags); >> if (ret) >> goto out_schemata_free; >> @@ -3255,8 +3282,8 @@ static int mkdir_rdt_prepare(struct kernfs_node >> *parent_kn, >> enum rdt_group_type rtype, struct rdtgroup **r) >> { >> struct rdtgroup *prdtgrp, *rdtgrp; >> + unsigned long files = 0; >> struct kernfs_node *kn; >> - uint files = 0; >> int ret; >> prdtgrp = rdtgroup_kn_lock_live(parent_kn); >> @@ -3308,10 +3335,13 @@ static int mkdir_rdt_prepare(struct kernfs_node >> *parent_kn, >> goto out_destroy; >> } >> - if (rtype == RDTCTRL_GROUP) >> + if (rtype == RDTCTRL_GROUP) { >> files = RFTYPE_BASE | RFTYPE_CTRL; >> - else >> + if (rdt_mon_capable) >> + files |= RFTYPE_MON; >> + } else { >> files = RFTYPE_BASE | RFTYPE_MON; >> + } >> ret = rdtgroup_add_files(kn, files); >> if (ret) { > > Thanks. > > -Fenghua -- Thanks Babu Moger