lkml.org 
[lkml]   [2023]   [Jan]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    From
    Subject[tip: x86/cache] x86/resctrl: Add interface to read mbm_local_bytes_config
    The following commit has been merged into the x86/cache branch of tip:

    Commit-ID: 73afb2d3ce2d7e0f9eee14e3f2b53d2bbfefd9c8
    Gitweb: https://git.kernel.org/tip/73afb2d3ce2d7e0f9eee14e3f2b53d2bbfefd9c8
    Author: Babu Moger <babu.moger@amd.com>
    AuthorDate: Fri, 13 Jan 2023 09:20:36 -06:00
    Committer: Borislav Petkov (AMD) <bp@alien8.de>
    CommitterDate: Mon, 23 Jan 2023 17:40:27 +01:00

    x86/resctrl: Add interface to read mbm_local_bytes_config

    The event configuration can be viewed by the user by reading the configuration
    file /sys/fs/resctrl/info/L3_MON/mbm_local_bytes_config. The event
    configuration settings are domain specific and will affect all the CPUs in the
    domain.

    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_config is set to 0x15 to count all the local
    event types.

    For example:

    $cat /sys/fs/resctrl/info/L3_MON/mbm_local_bytes_config
    0=0x15;1=0x15;2=0x15;3=0x15

    In this case, the event mbm_local_bytes is configured with 0x15 on
    domains 0 to 3.

    Signed-off-by: Babu Moger <babu.moger@amd.com>
    Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
    Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
    Link: https://lore.kernel.org/r/20230113152039.770054-11-babu.moger@amd.com
    ---
    arch/x86/kernel/cpu/resctrl/monitor.c | 4 +++-
    arch/x86/kernel/cpu/resctrl/rdtgroup.c | 16 ++++++++++++++++
    2 files changed, 19 insertions(+), 1 deletion(-)

    diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
    index 0ff45e3..28c6500 100644
    --- a/arch/x86/kernel/cpu/resctrl/monitor.c
    +++ b/arch/x86/kernel/cpu/resctrl/monitor.c
    @@ -805,8 +805,10 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r)
    mbm_total_event.configurable = true;
    mbm_config_rftype_init("mbm_total_bytes_config");
    }
    - if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL))
    + if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL)) {
    mbm_local_event.configurable = true;
    + mbm_config_rftype_init("mbm_local_bytes_config");
    + }
    }

    l3_mon_evt_init(r);
    diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
    index cd4e668..ad3c701 100644
    --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
    +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
    @@ -1507,6 +1507,16 @@ static int mbm_total_bytes_config_show(struct kernfs_open_file *of,
    return 0;
    }

    +static int mbm_local_bytes_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[] = {
    {
    @@ -1612,6 +1622,12 @@ static struct rftype res_common_files[] = {
    .seq_show = mbm_total_bytes_config_show,
    },
    {
    + .name = "mbm_local_bytes_config",
    + .mode = 0444,
    + .kf_ops = &rdtgroup_kf_single_ops,
    + .seq_show = mbm_local_bytes_config_show,
    + },
    + {
    .name = "cpus",
    .mode = 0644,
    .kf_ops = &rdtgroup_kf_single_ops,
    \
     
     \ /
      Last update: 2023-03-26 23:53    [W:4.111 / U:0.044 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site