Re: [PATCH 32/49] perf header: Support HYBRID_TOPOLOGY feature

From: Arnaldo Carvalho de Melo
Date: Mon Feb 08 2021 - 15:29:40 EST

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In reply to: kan . liang: "[PATCH 32/49] perf header: Support HYBRID_TOPOLOGY feature"
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Em Mon, Feb 08, 2021 at 07:25:29AM -0800, kan.liang@xxxxxxxxxxxxxxx escreveu:
> From: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
>
> It would be useful to let user know the hybrid topology.
> For example, the HYBRID_TOPOLOGY feature in header indicates which
> cpus are core cpus, and which cpus are atom cpus.

Can you please update tools/perf/Documentation/perf.data-file-format.txt
?

> With this patch,

> On a hybrid platform:
>
> root@otcpl-adl-s-2:~# ./perf report --header-only -I
> ...
> # cpu_core cpu list : 0-15
> # cpu_atom cpu list : 16-23
>
> On a non-hybrid platform:
>
> root@kbl-ppc:~# ./perf report --header-only -I
> ...
> # missing features: TRACING_DATA BRANCH_STACK GROUP_DESC AUXTRACE STAT CLOCKID DIR_FORMAT COMPRESSED CLOCK_DATA HYBRID_TOPOLOGY
>
> It just shows HYBRID_TOPOLOGY is missing feature.
>
> Reviewed-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
> ---
> tools/perf/util/cputopo.c | 80 +++++++++++++++++++++++++++++++++++++++++
> tools/perf/util/cputopo.h | 13 +++++++
> tools/perf/util/env.c | 6 ++++
> tools/perf/util/env.h | 7 ++++
> tools/perf/util/header.c | 92 +++++++++++++++++++++++++++++++++++++++++++++++
> tools/perf/util/header.h | 1 +
> tools/perf/util/pmu.c | 1 -
> tools/perf/util/pmu.h | 1 +
> 8 files changed, 200 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/cputopo.c b/tools/perf/util/cputopo.c
> index 1b52402..4a00fb8 100644
> --- a/tools/perf/util/cputopo.c
> +++ b/tools/perf/util/cputopo.c
> @@ -12,6 +12,7 @@
> #include "cpumap.h"
> #include "debug.h"
> #include "env.h"
> +#include "pmu.h"
>
> #define CORE_SIB_FMT \
> "%s/devices/system/cpu/cpu%d/topology/core_siblings_list"
> @@ -351,3 +352,82 @@ void numa_topology__delete(struct numa_topology *tp)
>
> free(tp);
> }
> +
> +static int load_hybrid_node(struct hybrid_topology_node *node,
> + struct perf_pmu *pmu)
> +{
> + const char *sysfs;
> + char path[PATH_MAX];
> + char *buf = NULL, *p;
> + FILE *fp;
> + size_t len = 0;
> +
> + node->pmu_name = strdup(pmu->name);
> + if (!node->pmu_name)
> + return -1;
> +
> + sysfs = sysfs__mountpoint();

Check for NULL

> + snprintf(path, PATH_MAX, CPUS_TEMPLATE_CPU, sysfs, pmu->name);
> +
> + fp = fopen(path, "r");
> + if (!fp)
> + goto err;
> +
> + if (getline(&buf, &len, fp) <= 0) {
> + fclose(fp);
> + goto err;
> + }
> +
> + p = strchr(buf, '\n');
> + if (p)
> + *p = '\0';
> +
> + fclose(fp);
> + node->cpus = buf;
> + return 0;
> +
> +err:
> + zfree(&node->pmu_name);
> + free(buf);
> + return -1;
> +}
> +
> +struct hybrid_topology *hybrid_topology__new(void)
> +{
> + struct perf_pmu *pmu;
> + struct hybrid_topology *tp = NULL;
> + u32 nr = 0, i = 0;
> +
> + perf_pmu__for_each_hybrid_pmus(pmu)
> + nr++;
> +
> + if (nr == 0)
> + return NULL;
> +
> + tp = zalloc(sizeof(*tp) + sizeof(tp->nodes[0]) * nr);
> + if (!tp)
> + return NULL;
> +
> + tp->nr = nr;
> + perf_pmu__for_each_hybrid_pmus(pmu) {
> + if (load_hybrid_node(&tp->nodes[i], pmu)) {
> + hybrid_topology__delete(tp);
> + return NULL;
> + }
> + i++;
> + }
> +
> + return tp;
> +}
> +
> +void hybrid_topology__delete(struct hybrid_topology *tp)
> +{
> + u32 i;
> +
> + for (i = 0; i < tp->nr; i++) {
> + zfree(&tp->nodes[i].pmu_name);
> + zfree(&tp->nodes[i].cpus);
> + }
> +
> + free(tp);
> +}
> diff --git a/tools/perf/util/cputopo.h b/tools/perf/util/cputopo.h
> index 6201c37..d9af971 100644
> --- a/tools/perf/util/cputopo.h
> +++ b/tools/perf/util/cputopo.h
> @@ -25,10 +25,23 @@ struct numa_topology {
> struct numa_topology_node nodes[];
> };
>
> +struct hybrid_topology_node {
> + char *pmu_name;
> + char *cpus;
> +};
> +
> +struct hybrid_topology {
> + u32 nr;
> + struct hybrid_topology_node nodes[];
> +};
> +
> struct cpu_topology *cpu_topology__new(void);
> void cpu_topology__delete(struct cpu_topology *tp);
>
> struct numa_topology *numa_topology__new(void);
> void numa_topology__delete(struct numa_topology *tp);
>
> +struct hybrid_topology *hybrid_topology__new(void);
> +void hybrid_topology__delete(struct hybrid_topology *tp);
> +
> #endif /* __PERF_CPUTOPO_H */
> diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c
> index 9130f6f..9e05eca 100644
> --- a/tools/perf/util/env.c
> +++ b/tools/perf/util/env.c
> @@ -202,6 +202,12 @@ void perf_env__exit(struct perf_env *env)
> for (i = 0; i < env->nr_memory_nodes; i++)
> zfree(&env->memory_nodes[i].set);
> zfree(&env->memory_nodes);
> +
> + for (i = 0; i < env->nr_hybrid_nodes; i++) {
> + perf_cpu_map__put(env->hybrid_nodes[i].map);
> + zfree(&env->hybrid_nodes[i].pmu_name);
> + }
> + zfree(&env->hybrid_nodes);
> }
>
> void perf_env__init(struct perf_env *env __maybe_unused)
> diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h
> index ca249bf..9ca7633 100644
> --- a/tools/perf/util/env.h
> +++ b/tools/perf/util/env.h
> @@ -37,6 +37,11 @@ struct memory_node {
> unsigned long *set;
> };
>
> +struct hybrid_node {
> + char *pmu_name;
> + struct perf_cpu_map *map;
> +};
> +
> struct perf_env {
> char *hostname;
> char *os_release;
> @@ -59,6 +64,7 @@ struct perf_env {
> int nr_pmu_mappings;
> int nr_groups;
> int nr_cpu_pmu_caps;
> + int nr_hybrid_nodes;
> char *cmdline;
> const char **cmdline_argv;
> char *sibling_cores;
> @@ -77,6 +83,7 @@ struct perf_env {
> struct numa_node *numa_nodes;
> struct memory_node *memory_nodes;
> unsigned long long memory_bsize;
> + struct hybrid_node *hybrid_nodes;
> #ifdef HAVE_LIBBPF_SUPPORT
> /*
> * bpf_info_lock protects bpf rbtrees. This is needed because the
> diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> index c4ed3dc..6bcd959 100644
> --- a/tools/perf/util/header.c
> +++ b/tools/perf/util/header.c
> @@ -932,6 +932,40 @@ static int write_clock_data(struct feat_fd *ff,
> return do_write(ff, data64, sizeof(*data64));
> }
>
> +static int write_hybrid_topology(struct feat_fd *ff,
> + struct evlist *evlist __maybe_unused)
> +{
> + struct hybrid_topology *tp;
> + int ret;
> + u32 i;
> +
> + tp = hybrid_topology__new();
> + if (!tp)
> + return -1;
> +
> + ret = do_write(ff, &tp->nr, sizeof(u32));
> + if (ret < 0)
> + goto err;
> +
> + for (i = 0; i < tp->nr; i++) {
> + struct hybrid_topology_node *n = &tp->nodes[i];
> +
> + ret = do_write_string(ff, n->pmu_name);
> + if (ret < 0)
> + goto err;
> +
> + ret = do_write_string(ff, n->cpus);
> + if (ret < 0)
> + goto err;
> + }
> +
> + ret = 0;
> +
> +err:
> + hybrid_topology__delete(tp);
> + return ret;
> +}
> +
> static int write_dir_format(struct feat_fd *ff,
> struct evlist *evlist __maybe_unused)
> {
> @@ -1623,6 +1657,19 @@ static void print_clock_data(struct feat_fd *ff, FILE *fp)
> clockid_name(clockid));
> }
>
> +static void print_hybrid_topology(struct feat_fd *ff, FILE *fp)
> +{
> + int i;
> + struct hybrid_node *n;
> +
> + for (i = 0; i < ff->ph->env.nr_hybrid_nodes; i++) {
> + n = &ff->ph->env.hybrid_nodes[i];
> +
> + fprintf(fp, "# %s cpu list : ", n->pmu_name);
> + cpu_map__fprintf(n->map, fp);
> + }
> +}
> +
> static void print_dir_format(struct feat_fd *ff, FILE *fp)
> {
> struct perf_session *session;
> @@ -2849,6 +2896,50 @@ static int process_clock_data(struct feat_fd *ff,
> return 0;
> }
>
> +static int process_hybrid_topology(struct feat_fd *ff,
> + void *data __maybe_unused)
> +{
> + struct hybrid_node *nodes, *n;
> + u32 nr, i;
> + char *str;
> +
> + /* nr nodes */
> + if (do_read_u32(ff, &nr))
> + return -1;
> +
> + nodes = zalloc(sizeof(*nodes) * nr);
> + if (!nodes)
> + return -ENOMEM;
> +
> + for (i = 0; i < nr; i++) {
> + n = &nodes[i];
> +
> + n->pmu_name = do_read_string(ff);
> + if (!n->pmu_name)
> + goto error;
> +
> + str = do_read_string(ff);
> + if (!str)
> + goto error;
> +
> + n->map = perf_cpu_map__new(str);
> + free(str);
> + if (!n->map)
> + goto error;
> + }
> +
> + ff->ph->env.nr_hybrid_nodes = nr;
> + ff->ph->env.hybrid_nodes = nodes;
> + return 0;
> +
> +error:
> + for (i = 0; i < nr; i++)
> + free(nodes[i].pmu_name);
> +
> + free(nodes);
> + return -1;
> +}
> +
> static int process_dir_format(struct feat_fd *ff,
> void *_data __maybe_unused)
> {
> @@ -3117,6 +3208,7 @@ const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE] = {
> FEAT_OPR(COMPRESSED, compressed, false),
> FEAT_OPR(CPU_PMU_CAPS, cpu_pmu_caps, false),
> FEAT_OPR(CLOCK_DATA, clock_data, false),
> + FEAT_OPN(HYBRID_TOPOLOGY, hybrid_topology, true),
> };
>
> struct header_print_data {
> diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
> index 2aca717..3f12ec0 100644
> --- a/tools/perf/util/header.h
> +++ b/tools/perf/util/header.h
> @@ -45,6 +45,7 @@ enum {
> HEADER_COMPRESSED,
> HEADER_CPU_PMU_CAPS,
> HEADER_CLOCK_DATA,
> + HEADER_HYBRID_TOPOLOGY,
> HEADER_LAST_FEATURE,
> HEADER_FEAT_BITS = 256,
> };
> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
> index 9a6c973..ca2fc67 100644
> --- a/tools/perf/util/pmu.c
> +++ b/tools/perf/util/pmu.c
> @@ -607,7 +607,6 @@ static struct perf_cpu_map *__pmu_cpumask(const char *path)
> */
> #define SYS_TEMPLATE_ID "./bus/event_source/devices/%s/identifier"
> #define CPUS_TEMPLATE_UNCORE "%s/bus/event_source/devices/%s/cpumask"
> -#define CPUS_TEMPLATE_CPU "%s/bus/event_source/devices/%s/cpus"
>
> static struct perf_cpu_map *pmu_cpumask(const char *name)
> {
> diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
> index 5b727cf..ccffc05 100644
> --- a/tools/perf/util/pmu.h
> +++ b/tools/perf/util/pmu.h
> @@ -20,6 +20,7 @@ enum {
>
> #define PERF_PMU_FORMAT_BITS 64
> #define EVENT_SOURCE_DEVICE_PATH "/bus/event_source/devices/"
> +#define CPUS_TEMPLATE_CPU "%s/bus/event_source/devices/%s/cpus"
>
> struct perf_event_attr;
>
> --
> 2.7.4
>

--

- Arnaldo

Next message: Liang, Kan: "Re: [PATCH 02/49] x86/cpu: Describe hybrid CPUs in cpuinfo_x86"
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In reply to: kan . liang: "[PATCH 32/49] perf header: Support HYBRID_TOPOLOGY feature"
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