diff options
| author | Tony Luck <tony.luck@intel.com> | 2024-06-28 14:56:08 -0700 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-07-02 19:49:54 +0200 |
| commit | 328ea688746420e12ced6cfbc5064413180244cc (patch) | |
| tree | 73eb4027c1bac117843f70177b879966d971cf0d /arch/x86/kernel | |
| parent | ac20aa423052553c005089b00f1e3caf79d3c1d3 (diff) | |
x86/resctrl: Prepare for new Sub-NUMA Cluster (SNC) monitor files
When SNC is enabled, monitoring data is collected at the SNC node granularity,
but must be reported at L3-cache granularity for backwards compatibility in
addition to reporting at the node level.
Add a "ci" field to the rdt_mon_domain structure to save the cache information
about the enclosing L3 cache for the domain. This provides:
1) The cache id which is needed to compose the name of the legacy monitoring
directory, and to determine which domains should be summed to provide
L3-scoped data.
2) The shared_cpu_map which is needed to determine which CPUs can be used to
read the RMID counters with the MSR interface.
This is the first step to an eventual goal of monitor reporting files like this
(for a system with two SNC nodes per L3):
$ cd /sys/fs/resctrl/mon_data
$ tree mon_L3_00
mon_L3_00 <- 00 here is L3 cache id
├── llc_occupancy \ These files provide legacy support
├── mbm_local_bytes > for non-SNC aware monitor apps
├── mbm_total_bytes / that expect data at L3 cache level
├── mon_sub_L3_00 <- 00 here is SNC node id
│ ├── llc_occupancy \ These files are finer grained
│ ├── mbm_local_bytes > data from each SNC node
│ └── mbm_total_bytes /
└── mon_sub_L3_01
├── llc_occupancy \
├── mbm_local_bytes > As above, but for node 1.
└── mbm_total_bytes /
[ bp: Massage commit message. ]
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lore.kernel.org/r/20240628215619.76401-9-tony.luck@intel.com
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/cpu/resctrl/core.c | 7 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 1 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/resctrl/rdtgroup.c | 1 |
3 files changed, 6 insertions, 3 deletions
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c index b86c525d0620..95ef8fe3cb50 100644 --- a/arch/x86/kernel/cpu/resctrl/core.c +++ b/arch/x86/kernel/cpu/resctrl/core.c @@ -19,7 +19,6 @@ #include <linux/cpu.h> #include <linux/slab.h> #include <linux/err.h> -#include <linux/cacheinfo.h> #include <linux/cpuhotplug.h> #include <asm/cpu_device_id.h> @@ -608,6 +607,12 @@ static void domain_add_cpu_mon(int cpu, struct rdt_resource *r) d = &hw_dom->d_resctrl; d->hdr.id = id; d->hdr.type = RESCTRL_MON_DOMAIN; + d->ci = get_cpu_cacheinfo_level(cpu, RESCTRL_L3_CACHE); + if (!d->ci) { + pr_warn_once("Can't find L3 cache for CPU:%d resource %s\n", cpu, r->name); + mon_domain_free(hw_dom); + return; + } cpumask_set_cpu(cpu, &d->hdr.cpu_mask); if (arch_domain_mbm_alloc(r->num_rmid, hw_dom)) { diff --git a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c index 70f0069b87d8..e69489d48625 100644 --- a/arch/x86/kernel/cpu/resctrl/pseudo_lock.c +++ b/arch/x86/kernel/cpu/resctrl/pseudo_lock.c @@ -11,7 +11,6 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt -#include <linux/cacheinfo.h> #include <linux/cpu.h> #include <linux/cpumask.h> #include <linux/debugfs.h> diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c index d3b0fa958266..70d41a8fd788 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -12,7 +12,6 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt -#include <linux/cacheinfo.h> #include <linux/cpu.h> #include <linux/debugfs.h> #include <linux/fs.h> |