diff options
| -rw-r--r-- | tools/perf/builtin-kmem.c | 81 |
1 files changed, 79 insertions, 2 deletions
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c index dc86f1e64b66..1ecf3f4415ce 100644 --- a/tools/perf/builtin-kmem.c +++ b/tools/perf/builtin-kmem.c @@ -36,6 +36,9 @@ static char default_sort_order[] = "frag,hit,bytes"; static char *cwd; static int cwdlen; +static int *cpunode_map; +static int max_cpu_num; + struct alloc_stat { union { u64 call_site; @@ -54,12 +57,74 @@ static struct rb_root root_caller_stat; static struct rb_root root_caller_sorted; static unsigned long total_requested, total_allocated; +static unsigned long nr_allocs, nr_cross_allocs; struct raw_event_sample { u32 size; char data[0]; }; +#define PATH_SYS_NODE "/sys/devices/system/node" + +static void init_cpunode_map(void) +{ + FILE *fp; + int i; + + fp = fopen("/sys/devices/system/cpu/kernel_max", "r"); + if (!fp) { + max_cpu_num = 4096; + return; + } + + if (fscanf(fp, "%d", &max_cpu_num) < 1) + die("Failed to read 'kernel_max' from sysfs"); + max_cpu_num++; + + cpunode_map = calloc(max_cpu_num, sizeof(int)); + if (!cpunode_map) + die("calloc"); + for (i = 0; i < max_cpu_num; i++) + cpunode_map[i] = -1; + fclose(fp); +} + +static void setup_cpunode_map(void) +{ + struct dirent *dent1, *dent2; + DIR *dir1, *dir2; + unsigned int cpu, mem; + char buf[PATH_MAX]; + + init_cpunode_map(); + + dir1 = opendir(PATH_SYS_NODE); + if (!dir1) + return; + + while (true) { + dent1 = readdir(dir1); + if (!dent1) + break; + + if (sscanf(dent1->d_name, "node%u", &mem) < 1) + continue; + + snprintf(buf, PATH_MAX, "%s/%s", PATH_SYS_NODE, dent1->d_name); + dir2 = opendir(buf); + if (!dir2) + continue; + while (true) { + dent2 = readdir(dir2); + if (!dent2) + break; + if (sscanf(dent2->d_name, "cpu%u", &cpu) < 1) + continue; + cpunode_map[cpu] = mem; + } + } +} + static int process_comm_event(event_t *event, unsigned long offset, unsigned long head) { @@ -157,15 +222,16 @@ static void insert_caller_stat(unsigned long call_site, static void process_alloc_event(struct raw_event_sample *raw, struct event *event, - int cpu __used, + int cpu, u64 timestamp __used, struct thread *thread __used, - int node __used) + int node) { unsigned long call_site; unsigned long ptr; int bytes_req; int bytes_alloc; + int node1, node2; ptr = raw_field_value(event, "ptr", raw->data); call_site = raw_field_value(event, "call_site", raw->data); @@ -177,6 +243,14 @@ static void process_alloc_event(struct raw_event_sample *raw, total_requested += bytes_req; total_allocated += bytes_alloc; + + if (node) { + node1 = cpunode_map[cpu]; + node2 = raw_field_value(event, "node", raw->data); + if (node1 != node2) + nr_cross_allocs++; + } + nr_allocs++; } static void process_free_event(struct raw_event_sample *raw __used, @@ -359,6 +433,7 @@ static void print_summary(void) total_allocated - total_requested); printf("Internal fragmentation: %f%%\n", fragmentation(total_requested, total_allocated)); + printf("Cross CPU allocations: %lu/%lu\n", nr_cross_allocs, nr_allocs); } static void print_result(void) @@ -685,6 +760,8 @@ int cmd_kmem(int argc, const char **argv, const char *prefix __used) if (list_empty(&alloc_sort)) setup_sorting(&alloc_sort, default_sort_order); + setup_cpunode_map(); + return __cmd_kmem(); } |