* [PATCH v3] perf pmu intel: Adjust cpumaks for sub-NUMA clusters on Emeraldrapids
@ 2026-02-12 22:39 Chun-Tse Shao
2026-02-13 0:08 ` Chen, Zide
0 siblings, 1 reply; 5+ messages in thread
From: Chun-Tse Shao @ 2026-02-12 22:39 UTC (permalink / raw)
To: linux-kernel
Cc: Chun-Tse Shao, peterz, mingo, acme, namhyung, mark.rutland,
alexander.shishkin, jolsa, irogers, adrian.hunter, james.clark,
ravi.bangoria, linux-perf-users
Similar to GNR [1], Emeraldrapids supports sub-NUMA clusters as well.
Adjust cpumasks as the logic for GNR in [1].
Tested on Emeraldrapids with SNC2 enabled:
$ perf stat --per-node -e 'UNC_CHA_CLOCKTICKS,UNC_M_CLOCKTICKS' -a -- sleep 1
Performance counter stats for 'system wide':
N0 30 72125876670 UNC_CHA_CLOCKTICKS
N0 4 8815163648 UNC_M_CLOCKTICKS
N1 30 72124958844 UNC_CHA_CLOCKTICKS
N1 4 8815014974 UNC_M_CLOCKTICKS
N2 30 72121049022 UNC_CHA_CLOCKTICKS
N2 4 8814592626 UNC_M_CLOCKTICKS
N3 30 72117133854 UNC_CHA_CLOCKTICKS
N3 4 8814012840 UNC_M_CLOCKTICKS
1.001574118 seconds time elapsed
[1] lore.kernel.org/20250515181417.491401-1-irogers@google.com
Signed-off-by: Chun-Tse Shao <ctshao@google.com>
---
v3:
Fix a typo.
v2: lore.kernel.org/20260205232220.1980168-1-ctshao@google.com
Split EMR and GNR in the SNC2 IMC cpu map.
v1: lore.kernel.org/20260108184430.1210223-1-ctshao@google.com
tools/perf/arch/x86/util/pmu.c | 95 ++++++++++++++++++++++------------
1 file changed, 63 insertions(+), 32 deletions(-)
diff --git a/tools/perf/arch/x86/util/pmu.c b/tools/perf/arch/x86/util/pmu.c
index a3f96221758d..2215984349f5 100644
--- a/tools/perf/arch/x86/util/pmu.c
+++ b/tools/perf/arch/x86/util/pmu.c
@@ -22,20 +22,29 @@
#include "util/env.h"
#include "util/header.h"
-static bool x86__is_intel_graniterapids(void)
+static bool x86__is_snc_supported(void)
{
- static bool checked_if_graniterapids;
- static bool is_graniterapids;
+ static bool checked_if_snc_supported;
+ static bool is_supported;
- if (!checked_if_graniterapids) {
- const char *graniterapids_cpuid = "GenuineIntel-6-A[DE]";
+ if (!checked_if_snc_supported) {
+
+ /* Emeraldrapids and Graniterapids support SNC configuration. */
+ static const char *const supported_cpuids[] = {
+ "GenuineIntel-6-CF", /* Emeraldrapids */
+ "GenuineIntel-6-A[DE]", /* Graniterapids */
+ };
char *cpuid = get_cpuid_str((struct perf_cpu){0});
- is_graniterapids = cpuid && strcmp_cpuid_str(graniterapids_cpuid, cpuid) == 0;
+ for (size_t i = 0; i < ARRAY_SIZE(supported_cpuids); i++) {
+ is_supported = cpuid && strcmp_cpuid_str(supported_cpuids[i], cpuid) == 0;
+ if (is_supported)
+ break;
+ }
free(cpuid);
- checked_if_graniterapids = true;
+ checked_if_snc_supported = true;
}
- return is_graniterapids;
+ return is_supported;
}
static struct perf_cpu_map *read_sysfs_cpu_map(const char *sysfs_path)
@@ -64,6 +73,7 @@ static int snc_nodes_per_l3_cache(void)
read_sysfs_cpu_map("devices/system/cpu/cpu0/cache/index3/shared_cpu_list");
snc_nodes = perf_cpu_map__nr(cache_cpus) / perf_cpu_map__nr(node_cpus);
+
perf_cpu_map__put(cache_cpus);
perf_cpu_map__put(node_cpus);
checked_snc = true;
@@ -137,23 +147,42 @@ static int uncore_imc_snc(struct perf_pmu *pmu)
// Compute the IMC SNC using lookup tables.
unsigned int imc_num;
int snc_nodes = snc_nodes_per_l3_cache();
- const u8 snc2_map[] = {1, 1, 0, 0, 1, 1, 0, 0};
- const u8 snc3_map[] = {1, 1, 0, 0, 2, 2, 1, 1, 0, 0, 2, 2};
- const u8 *snc_map;
- size_t snc_map_len;
-
- switch (snc_nodes) {
- case 2:
- snc_map = snc2_map;
- snc_map_len = ARRAY_SIZE(snc2_map);
- break;
- case 3:
- snc_map = snc3_map;
- snc_map_len = ARRAY_SIZE(snc3_map);
- break;
- default:
- /* Error or no lookup support for SNC with >3 nodes. */
- return 0;
+ char *cpuid;
+ static const u8 emr_snc2_map[] = { 0, 0, 1, 1 };
+ static const u8 gnr_snc2_map[] = { 1, 1, 0, 0 };
+ static const u8 snc3_map[] = { 1, 1, 0, 0, 2, 2 };
+ static const u8 *snc_map;
+ static size_t snc_map_len;
+
+ /* snc_map is not inited yet. We only look up once to avoid expensive operations. */
+ if (!snc_map) {
+ switch (snc_nodes) {
+ case 2:
+ cpuid = get_cpuid_str((struct perf_cpu){ 0 });
+ if (cpuid) {
+ if (strcmp_cpuid_str("GenuineIntel-6-CF", cpuid) == 0) {
+ snc_map = emr_snc2_map;
+ snc_map_len = ARRAY_SIZE(emr_snc2_map);
+ } else if (strcmp_cpuid_str("GenuineIntel-6-A[DE]", cpuid) == 0) {
+ snc_map = gnr_snc2_map;
+ snc_map_len = ARRAY_SIZE(gnr_snc2_map);
+ }
+ free(cpuid);
+ }
+ break;
+ case 3:
+ snc_map = snc3_map;
+ snc_map_len = ARRAY_SIZE(snc3_map);
+ break;
+ default:
+ /* Error or no lookup support for SNC with >3 nodes. */
+ return 0;
+ }
+
+ if (!snc_map) {
+ pr_warning("Unexpected: can not find snc map config");
+ return 0;
+ }
}
/* Compute SNC for PMU. */
@@ -161,11 +190,12 @@ static int uncore_imc_snc(struct perf_pmu *pmu)
pr_warning("Unexpected: unable to compute IMC number '%s'\n", pmu->name);
return 0;
}
- if (imc_num >= snc_map_len) {
+ if (imc_num >= snc_map_len * perf_cpu_map__nr(pmu->cpus)) {
pr_warning("Unexpected IMC %d for SNC%d mapping\n", imc_num, snc_nodes);
return 0;
}
- return snc_map[imc_num];
+
+ return snc_map[imc_num % snc_map_len];
}
static int uncore_cha_imc_compute_cpu_adjust(int pmu_snc)
@@ -205,7 +235,7 @@ static int uncore_cha_imc_compute_cpu_adjust(int pmu_snc)
return cpu_adjust[pmu_snc];
}
-static void gnr_uncore_cha_imc_adjust_cpumask_for_snc(struct perf_pmu *pmu, bool cha)
+static void uncore_cha_imc_adjust_cpumask_for_snc(struct perf_pmu *pmu, bool cha)
{
// With sub-NUMA clustering (SNC) there is a NUMA node per SNC in the
// topology. For example, a two socket graniterapids machine may be set
@@ -304,11 +334,12 @@ void perf_pmu__arch_init(struct perf_pmu *pmu)
pmu->mem_events = perf_mem_events_intel_aux;
else
pmu->mem_events = perf_mem_events_intel;
- } else if (x86__is_intel_graniterapids()) {
+ } else if (x86__is_snc_supported()) {
if (starts_with(pmu->name, "uncore_cha_"))
- gnr_uncore_cha_imc_adjust_cpumask_for_snc(pmu, /*cha=*/true);
- else if (starts_with(pmu->name, "uncore_imc_"))
- gnr_uncore_cha_imc_adjust_cpumask_for_snc(pmu, /*cha=*/false);
+ uncore_cha_imc_adjust_cpumask_for_snc(pmu, /*cha=*/true);
+ else if (starts_with(pmu->name, "uncore_imc_") &&
+ !starts_with(pmu->name, "uncore_imc_free_running"))
+ uncore_cha_imc_adjust_cpumask_for_snc(pmu, /*cha=*/false);
}
}
}
--
2.53.0.273.g2a3d683680-goog
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v3] perf pmu intel: Adjust cpumaks for sub-NUMA clusters on Emeraldrapids
2026-02-12 22:39 [PATCH v3] perf pmu intel: Adjust cpumaks for sub-NUMA clusters on Emeraldrapids Chun-Tse Shao
@ 2026-02-13 0:08 ` Chen, Zide
2026-04-01 16:38 ` Ian Rogers
0 siblings, 1 reply; 5+ messages in thread
From: Chen, Zide @ 2026-02-13 0:08 UTC (permalink / raw)
To: Chun-Tse Shao, linux-kernel
Cc: peterz, mingo, acme, namhyung, mark.rutland, alexander.shishkin,
jolsa, irogers, adrian.hunter, james.clark, ravi.bangoria,
linux-perf-users
On 2/12/2026 2:39 PM, Chun-Tse Shao wrote:
> Similar to GNR [1], Emeraldrapids supports sub-NUMA clusters as well.
> Adjust cpumasks as the logic for GNR in [1].
>
> Tested on Emeraldrapids with SNC2 enabled:
> $ perf stat --per-node -e 'UNC_CHA_CLOCKTICKS,UNC_M_CLOCKTICKS' -a -- sleep 1
>
> Performance counter stats for 'system wide':
>
> N0 30 72125876670 UNC_CHA_CLOCKTICKS
> N0 4 8815163648 UNC_M_CLOCKTICKS
> N1 30 72124958844 UNC_CHA_CLOCKTICKS
> N1 4 8815014974 UNC_M_CLOCKTICKS
> N2 30 72121049022 UNC_CHA_CLOCKTICKS
> N2 4 8814592626 UNC_M_CLOCKTICKS
> N3 30 72117133854 UNC_CHA_CLOCKTICKS
> N3 4 8814012840 UNC_M_CLOCKTICKS
>
> 1.001574118 seconds time elapsed
>
> [1] lore.kernel.org/20250515181417.491401-1-irogers@google.com
>
> Signed-off-by: Chun-Tse Shao <ctshao@google.com>
LGTM.
Reviewed-by: Zide Chen <zide.chen@intel.com>
> ---
> v3:
> Fix a typo.
>
> v2: lore.kernel.org/20260205232220.1980168-1-ctshao@google.com
> Split EMR and GNR in the SNC2 IMC cpu map.
>
> v1: lore.kernel.org/20260108184430.1210223-1-ctshao@google.com
>
> tools/perf/arch/x86/util/pmu.c | 95 ++++++++++++++++++++++------------
> 1 file changed, 63 insertions(+), 32 deletions(-)
>
> diff --git a/tools/perf/arch/x86/util/pmu.c b/tools/perf/arch/x86/util/pmu.c
> index a3f96221758d..2215984349f5 100644
> --- a/tools/perf/arch/x86/util/pmu.c
> +++ b/tools/perf/arch/x86/util/pmu.c
> @@ -22,20 +22,29 @@
> #include "util/env.h"
> #include "util/header.h"
>
> -static bool x86__is_intel_graniterapids(void)
> +static bool x86__is_snc_supported(void)
> {
> - static bool checked_if_graniterapids;
> - static bool is_graniterapids;
> + static bool checked_if_snc_supported;
> + static bool is_supported;
>
> - if (!checked_if_graniterapids) {
> - const char *graniterapids_cpuid = "GenuineIntel-6-A[DE]";
> + if (!checked_if_snc_supported) {
> +
> + /* Emeraldrapids and Graniterapids support SNC configuration. */
> + static const char *const supported_cpuids[] = {
> + "GenuineIntel-6-CF", /* Emeraldrapids */
> + "GenuineIntel-6-A[DE]", /* Graniterapids */
> + };
> char *cpuid = get_cpuid_str((struct perf_cpu){0});
>
> - is_graniterapids = cpuid && strcmp_cpuid_str(graniterapids_cpuid, cpuid) == 0;
> + for (size_t i = 0; i < ARRAY_SIZE(supported_cpuids); i++) {
> + is_supported = cpuid && strcmp_cpuid_str(supported_cpuids[i], cpuid) == 0;
> + if (is_supported)
> + break;
> + }
> free(cpuid);
> - checked_if_graniterapids = true;
> + checked_if_snc_supported = true;
> }
> - return is_graniterapids;
> + return is_supported;
> }
>
> static struct perf_cpu_map *read_sysfs_cpu_map(const char *sysfs_path)
> @@ -64,6 +73,7 @@ static int snc_nodes_per_l3_cache(void)
> read_sysfs_cpu_map("devices/system/cpu/cpu0/cache/index3/shared_cpu_list");
>
> snc_nodes = perf_cpu_map__nr(cache_cpus) / perf_cpu_map__nr(node_cpus);
> +
> perf_cpu_map__put(cache_cpus);
> perf_cpu_map__put(node_cpus);
> checked_snc = true;
> @@ -137,23 +147,42 @@ static int uncore_imc_snc(struct perf_pmu *pmu)
> // Compute the IMC SNC using lookup tables.
> unsigned int imc_num;
> int snc_nodes = snc_nodes_per_l3_cache();
> - const u8 snc2_map[] = {1, 1, 0, 0, 1, 1, 0, 0};
> - const u8 snc3_map[] = {1, 1, 0, 0, 2, 2, 1, 1, 0, 0, 2, 2};
> - const u8 *snc_map;
> - size_t snc_map_len;
> -
> - switch (snc_nodes) {
> - case 2:
> - snc_map = snc2_map;
> - snc_map_len = ARRAY_SIZE(snc2_map);
> - break;
> - case 3:
> - snc_map = snc3_map;
> - snc_map_len = ARRAY_SIZE(snc3_map);
> - break;
> - default:
> - /* Error or no lookup support for SNC with >3 nodes. */
> - return 0;
> + char *cpuid;
> + static const u8 emr_snc2_map[] = { 0, 0, 1, 1 };
> + static const u8 gnr_snc2_map[] = { 1, 1, 0, 0 };
> + static const u8 snc3_map[] = { 1, 1, 0, 0, 2, 2 };
> + static const u8 *snc_map;
> + static size_t snc_map_len;
> +
> + /* snc_map is not inited yet. We only look up once to avoid expensive operations. */
> + if (!snc_map) {
> + switch (snc_nodes) {
> + case 2:
> + cpuid = get_cpuid_str((struct perf_cpu){ 0 });
> + if (cpuid) {
> + if (strcmp_cpuid_str("GenuineIntel-6-CF", cpuid) == 0) {
> + snc_map = emr_snc2_map;
> + snc_map_len = ARRAY_SIZE(emr_snc2_map);
> + } else if (strcmp_cpuid_str("GenuineIntel-6-A[DE]", cpuid) == 0) {
> + snc_map = gnr_snc2_map;
> + snc_map_len = ARRAY_SIZE(gnr_snc2_map);
> + }
> + free(cpuid);
> + }
> + break;
> + case 3:
> + snc_map = snc3_map;
> + snc_map_len = ARRAY_SIZE(snc3_map);
> + break;
> + default:
> + /* Error or no lookup support for SNC with >3 nodes. */
> + return 0;
> + }
> +
> + if (!snc_map) {
> + pr_warning("Unexpected: can not find snc map config");
> + return 0;
> + }
> }
>
> /* Compute SNC for PMU. */
> @@ -161,11 +190,12 @@ static int uncore_imc_snc(struct perf_pmu *pmu)
> pr_warning("Unexpected: unable to compute IMC number '%s'\n", pmu->name);
> return 0;
> }
> - if (imc_num >= snc_map_len) {
> + if (imc_num >= snc_map_len * perf_cpu_map__nr(pmu->cpus)) {
> pr_warning("Unexpected IMC %d for SNC%d mapping\n", imc_num, snc_nodes);
> return 0;
> }
> - return snc_map[imc_num];
> +
> + return snc_map[imc_num % snc_map_len];
> }
>
> static int uncore_cha_imc_compute_cpu_adjust(int pmu_snc)
> @@ -205,7 +235,7 @@ static int uncore_cha_imc_compute_cpu_adjust(int pmu_snc)
> return cpu_adjust[pmu_snc];
> }
>
> -static void gnr_uncore_cha_imc_adjust_cpumask_for_snc(struct perf_pmu *pmu, bool cha)
> +static void uncore_cha_imc_adjust_cpumask_for_snc(struct perf_pmu *pmu, bool cha)
> {
> // With sub-NUMA clustering (SNC) there is a NUMA node per SNC in the
> // topology. For example, a two socket graniterapids machine may be set
> @@ -304,11 +334,12 @@ void perf_pmu__arch_init(struct perf_pmu *pmu)
> pmu->mem_events = perf_mem_events_intel_aux;
> else
> pmu->mem_events = perf_mem_events_intel;
> - } else if (x86__is_intel_graniterapids()) {
> + } else if (x86__is_snc_supported()) {
> if (starts_with(pmu->name, "uncore_cha_"))
> - gnr_uncore_cha_imc_adjust_cpumask_for_snc(pmu, /*cha=*/true);
> - else if (starts_with(pmu->name, "uncore_imc_"))
> - gnr_uncore_cha_imc_adjust_cpumask_for_snc(pmu, /*cha=*/false);
> + uncore_cha_imc_adjust_cpumask_for_snc(pmu, /*cha=*/true);
> + else if (starts_with(pmu->name, "uncore_imc_") &&
> + !starts_with(pmu->name, "uncore_imc_free_running"))
> + uncore_cha_imc_adjust_cpumask_for_snc(pmu, /*cha=*/false);
> }
> }
> }
> --
> 2.53.0.273.g2a3d683680-goog
>
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v3] perf pmu intel: Adjust cpumaks for sub-NUMA clusters on Emeraldrapids
2026-02-13 0:08 ` Chen, Zide
@ 2026-04-01 16:38 ` Ian Rogers
2026-04-02 0:07 ` Namhyung Kim
0 siblings, 1 reply; 5+ messages in thread
From: Ian Rogers @ 2026-04-01 16:38 UTC (permalink / raw)
To: Chen, Zide
Cc: Chun-Tse Shao, linux-kernel, peterz, mingo, acme, namhyung,
mark.rutland, alexander.shishkin, jolsa, adrian.hunter,
james.clark, ravi.bangoria, linux-perf-users
On Thu, Feb 12, 2026 at 4:08 PM Chen, Zide <zide.chen@intel.com> wrote:
>
> On 2/12/2026 2:39 PM, Chun-Tse Shao wrote:
> > Similar to GNR [1], Emeraldrapids supports sub-NUMA clusters as well.
> > Adjust cpumasks as the logic for GNR in [1].
> >
> > Tested on Emeraldrapids with SNC2 enabled:
> > $ perf stat --per-node -e 'UNC_CHA_CLOCKTICKS,UNC_M_CLOCKTICKS' -a -- sleep 1
> >
> > Performance counter stats for 'system wide':
> >
> > N0 30 72125876670 UNC_CHA_CLOCKTICKS
> > N0 4 8815163648 UNC_M_CLOCKTICKS
> > N1 30 72124958844 UNC_CHA_CLOCKTICKS
> > N1 4 8815014974 UNC_M_CLOCKTICKS
> > N2 30 72121049022 UNC_CHA_CLOCKTICKS
> > N2 4 8814592626 UNC_M_CLOCKTICKS
> > N3 30 72117133854 UNC_CHA_CLOCKTICKS
> > N3 4 8814012840 UNC_M_CLOCKTICKS
> >
> > 1.001574118 seconds time elapsed
> >
> > [1] lore.kernel.org/20250515181417.491401-1-irogers@google.com
> >
> > Signed-off-by: Chun-Tse Shao <ctshao@google.com>
>
> LGTM.
>
> Reviewed-by: Zide Chen <zide.chen@intel.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Thanks,
Ian
> > ---
> > v3:
> > Fix a typo.
> >
> > v2: lore.kernel.org/20260205232220.1980168-1-ctshao@google.com
> > Split EMR and GNR in the SNC2 IMC cpu map.
> >
> > v1: lore.kernel.org/20260108184430.1210223-1-ctshao@google.com
> >
> > tools/perf/arch/x86/util/pmu.c | 95 ++++++++++++++++++++++------------
> > 1 file changed, 63 insertions(+), 32 deletions(-)
> >
> > diff --git a/tools/perf/arch/x86/util/pmu.c b/tools/perf/arch/x86/util/pmu.c
> > index a3f96221758d..2215984349f5 100644
> > --- a/tools/perf/arch/x86/util/pmu.c
> > +++ b/tools/perf/arch/x86/util/pmu.c
> > @@ -22,20 +22,29 @@
> > #include "util/env.h"
> > #include "util/header.h"
> >
> > -static bool x86__is_intel_graniterapids(void)
> > +static bool x86__is_snc_supported(void)
> > {
> > - static bool checked_if_graniterapids;
> > - static bool is_graniterapids;
> > + static bool checked_if_snc_supported;
> > + static bool is_supported;
> >
> > - if (!checked_if_graniterapids) {
> > - const char *graniterapids_cpuid = "GenuineIntel-6-A[DE]";
> > + if (!checked_if_snc_supported) {
> > +
> > + /* Emeraldrapids and Graniterapids support SNC configuration. */
> > + static const char *const supported_cpuids[] = {
> > + "GenuineIntel-6-CF", /* Emeraldrapids */
> > + "GenuineIntel-6-A[DE]", /* Graniterapids */
> > + };
> > char *cpuid = get_cpuid_str((struct perf_cpu){0});
> >
> > - is_graniterapids = cpuid && strcmp_cpuid_str(graniterapids_cpuid, cpuid) == 0;
> > + for (size_t i = 0; i < ARRAY_SIZE(supported_cpuids); i++) {
> > + is_supported = cpuid && strcmp_cpuid_str(supported_cpuids[i], cpuid) == 0;
> > + if (is_supported)
> > + break;
> > + }
> > free(cpuid);
> > - checked_if_graniterapids = true;
> > + checked_if_snc_supported = true;
> > }
> > - return is_graniterapids;
> > + return is_supported;
> > }
> >
> > static struct perf_cpu_map *read_sysfs_cpu_map(const char *sysfs_path)
> > @@ -64,6 +73,7 @@ static int snc_nodes_per_l3_cache(void)
> > read_sysfs_cpu_map("devices/system/cpu/cpu0/cache/index3/shared_cpu_list");
> >
> > snc_nodes = perf_cpu_map__nr(cache_cpus) / perf_cpu_map__nr(node_cpus);
> > +
> > perf_cpu_map__put(cache_cpus);
> > perf_cpu_map__put(node_cpus);
> > checked_snc = true;
> > @@ -137,23 +147,42 @@ static int uncore_imc_snc(struct perf_pmu *pmu)
> > // Compute the IMC SNC using lookup tables.
> > unsigned int imc_num;
> > int snc_nodes = snc_nodes_per_l3_cache();
> > - const u8 snc2_map[] = {1, 1, 0, 0, 1, 1, 0, 0};
> > - const u8 snc3_map[] = {1, 1, 0, 0, 2, 2, 1, 1, 0, 0, 2, 2};
> > - const u8 *snc_map;
> > - size_t snc_map_len;
> > -
> > - switch (snc_nodes) {
> > - case 2:
> > - snc_map = snc2_map;
> > - snc_map_len = ARRAY_SIZE(snc2_map);
> > - break;
> > - case 3:
> > - snc_map = snc3_map;
> > - snc_map_len = ARRAY_SIZE(snc3_map);
> > - break;
> > - default:
> > - /* Error or no lookup support for SNC with >3 nodes. */
> > - return 0;
> > + char *cpuid;
> > + static const u8 emr_snc2_map[] = { 0, 0, 1, 1 };
> > + static const u8 gnr_snc2_map[] = { 1, 1, 0, 0 };
> > + static const u8 snc3_map[] = { 1, 1, 0, 0, 2, 2 };
> > + static const u8 *snc_map;
> > + static size_t snc_map_len;
> > +
> > + /* snc_map is not inited yet. We only look up once to avoid expensive operations. */
> > + if (!snc_map) {
> > + switch (snc_nodes) {
> > + case 2:
> > + cpuid = get_cpuid_str((struct perf_cpu){ 0 });
> > + if (cpuid) {
> > + if (strcmp_cpuid_str("GenuineIntel-6-CF", cpuid) == 0) {
> > + snc_map = emr_snc2_map;
> > + snc_map_len = ARRAY_SIZE(emr_snc2_map);
> > + } else if (strcmp_cpuid_str("GenuineIntel-6-A[DE]", cpuid) == 0) {
> > + snc_map = gnr_snc2_map;
> > + snc_map_len = ARRAY_SIZE(gnr_snc2_map);
> > + }
> > + free(cpuid);
> > + }
> > + break;
> > + case 3:
> > + snc_map = snc3_map;
> > + snc_map_len = ARRAY_SIZE(snc3_map);
> > + break;
> > + default:
> > + /* Error or no lookup support for SNC with >3 nodes. */
> > + return 0;
> > + }
> > +
> > + if (!snc_map) {
> > + pr_warning("Unexpected: can not find snc map config");
> > + return 0;
> > + }
> > }
> >
> > /* Compute SNC for PMU. */
> > @@ -161,11 +190,12 @@ static int uncore_imc_snc(struct perf_pmu *pmu)
> > pr_warning("Unexpected: unable to compute IMC number '%s'\n", pmu->name);
> > return 0;
> > }
> > - if (imc_num >= snc_map_len) {
> > + if (imc_num >= snc_map_len * perf_cpu_map__nr(pmu->cpus)) {
> > pr_warning("Unexpected IMC %d for SNC%d mapping\n", imc_num, snc_nodes);
> > return 0;
> > }
> > - return snc_map[imc_num];
> > +
> > + return snc_map[imc_num % snc_map_len];
> > }
> >
> > static int uncore_cha_imc_compute_cpu_adjust(int pmu_snc)
> > @@ -205,7 +235,7 @@ static int uncore_cha_imc_compute_cpu_adjust(int pmu_snc)
> > return cpu_adjust[pmu_snc];
> > }
> >
> > -static void gnr_uncore_cha_imc_adjust_cpumask_for_snc(struct perf_pmu *pmu, bool cha)
> > +static void uncore_cha_imc_adjust_cpumask_for_snc(struct perf_pmu *pmu, bool cha)
> > {
> > // With sub-NUMA clustering (SNC) there is a NUMA node per SNC in the
> > // topology. For example, a two socket graniterapids machine may be set
> > @@ -304,11 +334,12 @@ void perf_pmu__arch_init(struct perf_pmu *pmu)
> > pmu->mem_events = perf_mem_events_intel_aux;
> > else
> > pmu->mem_events = perf_mem_events_intel;
> > - } else if (x86__is_intel_graniterapids()) {
> > + } else if (x86__is_snc_supported()) {
> > if (starts_with(pmu->name, "uncore_cha_"))
> > - gnr_uncore_cha_imc_adjust_cpumask_for_snc(pmu, /*cha=*/true);
> > - else if (starts_with(pmu->name, "uncore_imc_"))
> > - gnr_uncore_cha_imc_adjust_cpumask_for_snc(pmu, /*cha=*/false);
> > + uncore_cha_imc_adjust_cpumask_for_snc(pmu, /*cha=*/true);
> > + else if (starts_with(pmu->name, "uncore_imc_") &&
> > + !starts_with(pmu->name, "uncore_imc_free_running"))
> > + uncore_cha_imc_adjust_cpumask_for_snc(pmu, /*cha=*/false);
> > }
> > }
> > }
> > --
> > 2.53.0.273.g2a3d683680-goog
> >
> >
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v3] perf pmu intel: Adjust cpumaks for sub-NUMA clusters on Emeraldrapids
2026-04-01 16:38 ` Ian Rogers
@ 2026-04-02 0:07 ` Namhyung Kim
2026-04-02 20:54 ` Chun-Tse Shao
0 siblings, 1 reply; 5+ messages in thread
From: Namhyung Kim @ 2026-04-02 0:07 UTC (permalink / raw)
To: Ian Rogers
Cc: Chen, Zide, Chun-Tse Shao, linux-kernel, peterz, mingo, acme,
mark.rutland, alexander.shishkin, jolsa, adrian.hunter,
james.clark, ravi.bangoria, linux-perf-users
On Wed, Apr 01, 2026 at 09:38:24AM -0700, Ian Rogers wrote:
> On Thu, Feb 12, 2026 at 4:08 PM Chen, Zide <zide.chen@intel.com> wrote:
> >
> > On 2/12/2026 2:39 PM, Chun-Tse Shao wrote:
> > > Similar to GNR [1], Emeraldrapids supports sub-NUMA clusters as well.
> > > Adjust cpumasks as the logic for GNR in [1].
> > >
> > > Tested on Emeraldrapids with SNC2 enabled:
> > > $ perf stat --per-node -e 'UNC_CHA_CLOCKTICKS,UNC_M_CLOCKTICKS' -a -- sleep 1
> > >
> > > Performance counter stats for 'system wide':
> > >
> > > N0 30 72125876670 UNC_CHA_CLOCKTICKS
> > > N0 4 8815163648 UNC_M_CLOCKTICKS
> > > N1 30 72124958844 UNC_CHA_CLOCKTICKS
> > > N1 4 8815014974 UNC_M_CLOCKTICKS
> > > N2 30 72121049022 UNC_CHA_CLOCKTICKS
> > > N2 4 8814592626 UNC_M_CLOCKTICKS
> > > N3 30 72117133854 UNC_CHA_CLOCKTICKS
> > > N3 4 8814012840 UNC_M_CLOCKTICKS
> > >
> > > 1.001574118 seconds time elapsed
> > >
> > > [1] lore.kernel.org/20250515181417.491401-1-irogers@google.com
> > >
> > > Signed-off-by: Chun-Tse Shao <ctshao@google.com>
> >
> > LGTM.
> >
> > Reviewed-by: Zide Chen <zide.chen@intel.com>
>
> Reviewed-by: Ian Rogers <irogers@google.com>
It doesn't apply cleanly anymore. CT, can you please rebase?
Thanks,
Namhyung
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v3] perf pmu intel: Adjust cpumaks for sub-NUMA clusters on Emeraldrapids
2026-04-02 0:07 ` Namhyung Kim
@ 2026-04-02 20:54 ` Chun-Tse Shao
0 siblings, 0 replies; 5+ messages in thread
From: Chun-Tse Shao @ 2026-04-02 20:54 UTC (permalink / raw)
To: Namhyung Kim
Cc: Ian Rogers, Chen, Zide, linux-kernel, peterz, mingo, acme,
mark.rutland, alexander.shishkin, jolsa, adrian.hunter,
james.clark, ravi.bangoria, linux-perf-users
Please check patch v4 for rebasing.
https://lore.kernel.org/20260402205300.1953706-1-ctshao@google.com
Thanks,
CT
On Wed, Apr 1, 2026 at 5:08 PM Namhyung Kim <namhyung@kernel.org> wrote:
>
> On Wed, Apr 01, 2026 at 09:38:24AM -0700, Ian Rogers wrote:
> > On Thu, Feb 12, 2026 at 4:08 PM Chen, Zide <zide.chen@intel.com> wrote:
> > >
> > > On 2/12/2026 2:39 PM, Chun-Tse Shao wrote:
> > > > Similar to GNR [1], Emeraldrapids supports sub-NUMA clusters as well.
> > > > Adjust cpumasks as the logic for GNR in [1].
> > > >
> > > > Tested on Emeraldrapids with SNC2 enabled:
> > > > $ perf stat --per-node -e 'UNC_CHA_CLOCKTICKS,UNC_M_CLOCKTICKS' -a -- sleep 1
> > > >
> > > > Performance counter stats for 'system wide':
> > > >
> > > > N0 30 72125876670 UNC_CHA_CLOCKTICKS
> > > > N0 4 8815163648 UNC_M_CLOCKTICKS
> > > > N1 30 72124958844 UNC_CHA_CLOCKTICKS
> > > > N1 4 8815014974 UNC_M_CLOCKTICKS
> > > > N2 30 72121049022 UNC_CHA_CLOCKTICKS
> > > > N2 4 8814592626 UNC_M_CLOCKTICKS
> > > > N3 30 72117133854 UNC_CHA_CLOCKTICKS
> > > > N3 4 8814012840 UNC_M_CLOCKTICKS
> > > >
> > > > 1.001574118 seconds time elapsed
> > > >
> > > > [1] lore.kernel.org/20250515181417.491401-1-irogers@google.com
> > > >
> > > > Signed-off-by: Chun-Tse Shao <ctshao@google.com>
> > >
> > > LGTM.
> > >
> > > Reviewed-by: Zide Chen <zide.chen@intel.com>
> >
> > Reviewed-by: Ian Rogers <irogers@google.com>
>
> It doesn't apply cleanly anymore. CT, can you please rebase?
>
> Thanks,
> Namhyung
>
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2026-04-02 20:54 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
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2026-02-12 22:39 [PATCH v3] perf pmu intel: Adjust cpumaks for sub-NUMA clusters on Emeraldrapids Chun-Tse Shao
2026-02-13 0:08 ` Chen, Zide
2026-04-01 16:38 ` Ian Rogers
2026-04-02 0:07 ` Namhyung Kim
2026-04-02 20:54 ` Chun-Tse Shao
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