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Date:   Tue, 9 Feb 2021 08:26:12 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        kan.liang@...ux.intel.com
Cc:     peterz@...radead.org, mingo@...nel.org,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, bp@...en8.de,
        namhyung@...nel.org, jolsa@...hat.com, ak@...ux.intel.com,
        alexander.shishkin@...ux.intel.com, adrian.hunter@...el.com
Subject: Re: [PATCH 32/49] perf header: Support HYBRID_TOPOLOGY feature

Hi Arnaldo,

On 2/9/2021 3:05 AM, Arnaldo Carvalho de Melo wrote:
> Em Mon, Feb 08, 2021 at 07:25:29AM -0800, kan.liang@...ux.intel.com escreveu:
>> From: Jin Yao <yao.jin@...ux.intel.com>
>>
>> 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
> ?
>   

OK, I will update perf.data-file-format.txt in next version.

>> With this patch,
> 
>> On a hybrid platform:
>>
>>    root@...pl-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@...-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@...ux.intel.com>
>> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
>> ---
>>   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
> 

Yes, my fault, I need to check for NULL.

Thanks
Jin Yao

>> +	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
>>
> 

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