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Subject[PATCH 46/54] perf tools: Add MEM_TOPOLOGY feature to perf data file
Date
From: Jiri Olsa <jolsa@kernel.org>

Adding MEM_TOPOLOGY feature to perf data file,
that will carry physical memory map and its
node assignments.

The format of data in MEM_TOPOLOGY is as follows:

0 - version | for future changes
8 - block_size_bytes | /sys/devices/system/memory/block_size_bytes
16 - count | number of nodes

For each node we store map of physical indexes for
each node:

32 - node id | node index
40 - size | size of bitmap
48 - bitmap | bitmap of memory indexes that belongs to node
| /sys/devices/system/node/node<NODE>/memory<INDEX>

The MEM_TOPOLOGY could be displayed with following
report command:

$ perf report --header-only -I
...
# memory nodes (nr 1, block size 0x8000000):
# 0 [7G]: 0-23,32-69

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180307155020.32613-8-jolsa@kernel.org
[ Rename 'index' to 'idx', as this breaks the build in rhel5, 6 and other systems where this is used by glibc headers ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/include/linux/bitmap.h | 2 +-
tools/perf/util/env.h | 9 ++
tools/perf/util/header.c | 305 +++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/header.h | 1 +
4 files changed, 316 insertions(+), 1 deletion(-)

diff --git a/tools/include/linux/bitmap.h b/tools/include/linux/bitmap.h
index ca160270fdfa..63440cc8d618 100644
--- a/tools/include/linux/bitmap.h
+++ b/tools/include/linux/bitmap.h
@@ -98,7 +98,7 @@ static inline int test_and_set_bit(int nr, unsigned long *addr)

/**
* bitmap_alloc - Allocate bitmap
- * @nr: Bit to set
+ * @nbits: Number of bits
*/
static inline unsigned long *bitmap_alloc(int nbits)
{
diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h
index bf970f57dce0..c4ef2e523367 100644
--- a/tools/perf/util/env.h
+++ b/tools/perf/util/env.h
@@ -27,6 +27,12 @@ struct numa_node {
struct cpu_map *map;
};

+struct memory_node {
+ u64 node;
+ u64 size;
+ unsigned long *set;
+};
+
struct perf_env {
char *hostname;
char *os_release;
@@ -43,6 +49,7 @@ struct perf_env {
int nr_sibling_cores;
int nr_sibling_threads;
int nr_numa_nodes;
+ int nr_memory_nodes;
int nr_pmu_mappings;
int nr_groups;
char *cmdline;
@@ -54,6 +61,8 @@ struct perf_env {
struct cpu_cache_level *caches;
int caches_cnt;
struct numa_node *numa_nodes;
+ struct memory_node *memory_nodes;
+ unsigned long long memory_bsize;
};

extern struct perf_env perf_env;
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index e0c3cad0fd8d..e14b3f7c7212 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -17,6 +17,7 @@
#include <sys/stat.h>
#include <sys/utsname.h>
#include <linux/time64.h>
+#include <dirent.h>

#include "evlist.h"
#include "evsel.h"
@@ -37,6 +38,7 @@
#include "asm/bug.h"
#include "tool.h"
#include "time-utils.h"
+#include "units.h"

#include "sane_ctype.h"

@@ -131,6 +133,25 @@ int do_write(struct feat_fd *ff, const void *buf, size_t size)
return __do_write_buf(ff, buf, size);
}

+/* Return: 0 if succeded, -ERR if failed. */
+static int do_write_bitmap(struct feat_fd *ff, unsigned long *set, u64 size)
+{
+ u64 *p = (u64 *) set;
+ int i, ret;
+
+ ret = do_write(ff, &size, sizeof(size));
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; (u64) i < BITS_TO_U64(size); i++) {
+ ret = do_write(ff, p + i, sizeof(*p));
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
/* Return: 0 if succeded, -ERR if failed. */
int write_padded(struct feat_fd *ff, const void *bf,
size_t count, size_t count_aligned)
@@ -243,6 +264,38 @@ static char *do_read_string(struct feat_fd *ff)
return NULL;
}

+/* Return: 0 if succeded, -ERR if failed. */
+static int do_read_bitmap(struct feat_fd *ff, unsigned long **pset, u64 *psize)
+{
+ unsigned long *set;
+ u64 size, *p;
+ int i, ret;
+
+ ret = do_read_u64(ff, &size);
+ if (ret)
+ return ret;
+
+ set = bitmap_alloc(size);
+ if (!set)
+ return -ENOMEM;
+
+ bitmap_zero(set, size);
+
+ p = (u64 *) set;
+
+ for (i = 0; (u64) i < BITS_TO_U64(size); i++) {
+ ret = do_read_u64(ff, p + i);
+ if (ret < 0) {
+ free(set);
+ return ret;
+ }
+ }
+
+ *pset = set;
+ *psize = size;
+ return 0;
+}
+
static int write_tracing_data(struct feat_fd *ff,
struct perf_evlist *evlist)
{
@@ -1196,6 +1249,176 @@ static int write_sample_time(struct feat_fd *ff,
sizeof(evlist->last_sample_time));
}

+
+static int memory_node__read(struct memory_node *n, unsigned long idx)
+{
+ unsigned int phys, size = 0;
+ char path[PATH_MAX];
+ struct dirent *ent;
+ DIR *dir;
+
+#define for_each_memory(mem, dir) \
+ while ((ent = readdir(dir))) \
+ if (strcmp(ent->d_name, ".") && \
+ strcmp(ent->d_name, "..") && \
+ sscanf(ent->d_name, "memory%u", &mem) == 1)
+
+ scnprintf(path, PATH_MAX,
+ "%s/devices/system/node/node%lu",
+ sysfs__mountpoint(), idx);
+
+ dir = opendir(path);
+ if (!dir) {
+ pr_warning("failed: cant' open memory sysfs data\n");
+ return -1;
+ }
+
+ for_each_memory(phys, dir) {
+ size = max(phys, size);
+ }
+
+ size++;
+
+ n->set = bitmap_alloc(size);
+ if (!n->set) {
+ closedir(dir);
+ return -ENOMEM;
+ }
+
+ bitmap_zero(n->set, size);
+ n->node = idx;
+ n->size = size;
+
+ rewinddir(dir);
+
+ for_each_memory(phys, dir) {
+ set_bit(phys, n->set);
+ }
+
+ closedir(dir);
+ return 0;
+}
+
+static int memory_node__sort(const void *a, const void *b)
+{
+ const struct memory_node *na = a;
+ const struct memory_node *nb = b;
+
+ return na->node - nb->node;
+}
+
+static int build_mem_topology(struct memory_node *nodes, u64 size, u64 *cntp)
+{
+ char path[PATH_MAX];
+ struct dirent *ent;
+ DIR *dir;
+ u64 cnt = 0;
+ int ret = 0;
+
+ scnprintf(path, PATH_MAX, "%s/devices/system/node/",
+ sysfs__mountpoint());
+
+ dir = opendir(path);
+ if (!dir) {
+ pr_warning("failed: can't open node sysfs data\n");
+ return -1;
+ }
+
+ while (!ret && (ent = readdir(dir))) {
+ unsigned int idx;
+ int r;
+
+ if (!strcmp(ent->d_name, ".") ||
+ !strcmp(ent->d_name, ".."))
+ continue;
+
+ r = sscanf(ent->d_name, "node%u", &idx);
+ if (r != 1)
+ continue;
+
+ if (WARN_ONCE(cnt >= size,
+ "failed to write MEM_TOPOLOGY, way too many nodes\n"))
+ return -1;
+
+ ret = memory_node__read(&nodes[cnt++], idx);
+ }
+
+ *cntp = cnt;
+ closedir(dir);
+
+ if (!ret)
+ qsort(nodes, cnt, sizeof(nodes[0]), memory_node__sort);
+
+ return ret;
+}
+
+#define MAX_MEMORY_NODES 2000
+
+/*
+ * The MEM_TOPOLOGY holds physical memory map for every
+ * node in system. The format of data is as follows:
+ *
+ * 0 - version | for future changes
+ * 8 - block_size_bytes | /sys/devices/system/memory/block_size_bytes
+ * 16 - count | number of nodes
+ *
+ * For each node we store map of physical indexes for
+ * each node:
+ *
+ * 32 - node id | node index
+ * 40 - size | size of bitmap
+ * 48 - bitmap | bitmap of memory indexes that belongs to node
+ */
+static int write_mem_topology(struct feat_fd *ff __maybe_unused,
+ struct perf_evlist *evlist __maybe_unused)
+{
+ static struct memory_node nodes[MAX_MEMORY_NODES];
+ u64 bsize, version = 1, i, nr;
+ int ret;
+
+ ret = sysfs__read_xll("devices/system/memory/block_size_bytes",
+ (unsigned long long *) &bsize);
+ if (ret)
+ return ret;
+
+ ret = build_mem_topology(&nodes[0], MAX_MEMORY_NODES, &nr);
+ if (ret)
+ return ret;
+
+ ret = do_write(ff, &version, sizeof(version));
+ if (ret < 0)
+ goto out;
+
+ ret = do_write(ff, &bsize, sizeof(bsize));
+ if (ret < 0)
+ goto out;
+
+ ret = do_write(ff, &nr, sizeof(nr));
+ if (ret < 0)
+ goto out;
+
+ for (i = 0; i < nr; i++) {
+ struct memory_node *n = &nodes[i];
+
+ #define _W(v) \
+ ret = do_write(ff, &n->v, sizeof(n->v)); \
+ if (ret < 0) \
+ goto out;
+
+ _W(node)
+ _W(size)
+
+ #undef _W
+
+ ret = do_write_bitmap(ff, n->set, n->size);
+ if (ret < 0)
+ goto out;
+ }
+
+out:
+ return ret;
+}
+
static void print_hostname(struct feat_fd *ff, FILE *fp)
{
fprintf(fp, "# hostname : %s\n", ff->ph->env.hostname);
@@ -1543,6 +1766,35 @@ static void print_sample_time(struct feat_fd *ff, FILE *fp)
fprintf(fp, "# sample duration : %10.3f ms\n", d);
}

+static void memory_node__fprintf(struct memory_node *n,
+ unsigned long long bsize, FILE *fp)
+{
+ char buf_map[100], buf_size[50];
+ unsigned long long size;
+
+ size = bsize * bitmap_weight(n->set, n->size);
+ unit_number__scnprintf(buf_size, 50, size);
+
+ bitmap_scnprintf(n->set, n->size, buf_map, 100);
+ fprintf(fp, "# %3" PRIu64 " [%s]: %s\n", n->node, buf_size, buf_map);
+}
+
+static void print_mem_topology(struct feat_fd *ff, FILE *fp)
+{
+ struct memory_node *nodes;
+ int i, nr;
+
+ nodes = ff->ph->env.memory_nodes;
+ nr = ff->ph->env.nr_memory_nodes;
+
+ fprintf(fp, "# memory nodes (nr %d, block size 0x%llx):\n",
+ nr, ff->ph->env.memory_bsize);
+
+ for (i = 0; i < nr; i++) {
+ memory_node__fprintf(&nodes[i], ff->ph->env.memory_bsize, fp);
+ }
+}
+
static int __event_process_build_id(struct build_id_event *bev,
char *filename,
struct perf_session *session)
@@ -2205,6 +2457,58 @@ static int process_sample_time(struct feat_fd *ff, void *data __maybe_unused)
return 0;
}

+static int process_mem_topology(struct feat_fd *ff,
+ void *data __maybe_unused)
+{
+ struct memory_node *nodes;
+ u64 version, i, nr, bsize;
+ int ret = -1;
+
+ if (do_read_u64(ff, &version))
+ return -1;
+
+ if (version != 1)
+ return -1;
+
+ if (do_read_u64(ff, &bsize))
+ return -1;
+
+ if (do_read_u64(ff, &nr))
+ return -1;
+
+ nodes = zalloc(sizeof(*nodes) * nr);
+ if (!nodes)
+ return -1;
+
+ for (i = 0; i < nr; i++) {
+ struct memory_node n;
+
+ #define _R(v) \
+ if (do_read_u64(ff, &n.v)) \
+ goto out; \
+
+ _R(node)
+ _R(size)
+
+ #undef _R
+
+ if (do_read_bitmap(ff, &n.set, &n.size))
+ goto out;
+
+ nodes[i] = n;
+ }
+
+ ff->ph->env.memory_bsize = bsize;
+ ff->ph->env.memory_nodes = nodes;
+ ff->ph->env.nr_memory_nodes = nr;
+ ret = 0;
+
+out:
+ if (ret)
+ free(nodes);
+ return ret;
+}
+
struct feature_ops {
int (*write)(struct feat_fd *ff, struct perf_evlist *evlist);
void (*print)(struct feat_fd *ff, FILE *fp);
@@ -2263,6 +2567,7 @@ static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
FEAT_OPN(STAT, stat, false),
FEAT_OPN(CACHE, cache, true),
FEAT_OPR(SAMPLE_TIME, sample_time, false),
+ FEAT_OPR(MEM_TOPOLOGY, mem_topology, true),
};

struct header_print_data {
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 942bdec6d70d..90d4577a92dc 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -36,6 +36,7 @@ enum {
HEADER_STAT,
HEADER_CACHE,
HEADER_SAMPLE_TIME,
+ HEADER_MEM_TOPOLOGY,
HEADER_LAST_FEATURE,
HEADER_FEAT_BITS = 256,
};
--
2.14.3
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