Messages in this thread Patch in this message | | | Subject | [PATCH v6 08/12] x86/resctrl: Add sysfs interface to read mbm_local_bytes event configuration | From | Babu Moger <> | Date | Mon, 10 Oct 2022 15:29:40 -0500 |
| |
The current event configuration can be viewed by the user by reading the configuration file /sys/fs/resctrl/info/L3_MON/mbm_local_config.
Following are the types of events supported:
==== =========================================================== Bits Description ==== =========================================================== 6 Dirty Victims from the QOS domain to all types of memory 5 Reads to slow memory in the non-local NUMA domain 4 Reads to slow memory in the local NUMA domain 3 Non-temporal writes to non-local NUMA domain 2 Non-temporal writes to local NUMA domain 1 Reads to memory in the non-local NUMA domain 0 Reads to memory in the local NUMA domain ==== ===========================================================
By default, the mbm_local_bytes configuration is set to 0x15 to count all the local event types. The event configuration settings are domain specific. Changing the configuration on one CPU in a domain would affect the whole domain.
For example: $cat /sys/fs/resctrl/info/L3_MON/mbm_local_config 0=0x15;1=0x15;2=0x15;3=0x15
In this case the event mbm_local_bytes is currently configured with 0x15 on domains 0 to 3.
Signed-off-by: Babu Moger <babu.moger@amd.com> --- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c index 0982845594d0..305fb0475970 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -1484,6 +1484,16 @@ static int mbm_total_config_show(struct kernfs_open_file *of, return 0; } +static int mbm_local_config_show(struct kernfs_open_file *of, + struct seq_file *seq, void *v) +{ + struct rdt_resource *r = of->kn->parent->priv; + + mbm_config_show(seq, r, QOS_L3_MBM_LOCAL_EVENT_ID); + + return 0; +} + /* rdtgroup information files for one cache resource. */ static struct rftype res_common_files[] = { { @@ -1588,6 +1598,12 @@ static struct rftype res_common_files[] = { .kf_ops = &rdtgroup_kf_single_ops, .seq_show = mbm_total_config_show, }, + { + .name = "mbm_local_config", + .mode = 0644, + .kf_ops = &rdtgroup_kf_single_ops, + .seq_show = mbm_local_config_show, + }, { .name = "cpus", .mode = 0644, @@ -1701,6 +1717,10 @@ void __init mbm_config_rftype_init(void) rft = rdtgroup_get_rftype_by_name("mbm_total_config"); if (rft) rft->fflags = RF_MON_INFO | RFTYPE_RES_CACHE; + + rft = rdtgroup_get_rftype_by_name("mbm_local_config"); + if (rft) + rft->fflags = RF_MON_INFO | RFTYPE_RES_CACHE; } /**
| |