diff options
-rw-r--r-- | tools/perf/util/bpf_off_cpu.c | 24 | ||||
-rw-r--r-- | tools/perf/util/bpf_skel/off_cpu.bpf.c | 9 |
2 files changed, 33 insertions, 0 deletions
diff --git a/tools/perf/util/bpf_off_cpu.c b/tools/perf/util/bpf_off_cpu.c index 2101aa2b7c42..1975a02c1683 100644 --- a/tools/perf/util/bpf_off_cpu.c +++ b/tools/perf/util/bpf_off_cpu.c @@ -13,6 +13,7 @@ #include "util/cgroup.h" #include "util/strlist.h" #include <bpf/bpf.h> +#include <internal/xyarray.h> #include "bpf_skel/off_cpu.skel.h" @@ -60,6 +61,9 @@ static int off_cpu_config(struct evlist *evlist) static void off_cpu_start(void *arg) { struct evlist *evlist = arg; + struct evsel *evsel; + struct perf_cpu pcpu; + int i; /* update task filter for the given workload */ if (skel->rodata->has_task && skel->rodata->uses_tgid && @@ -73,6 +77,26 @@ static void off_cpu_start(void *arg) bpf_map_update_elem(fd, &pid, &val, BPF_ANY); } + /* update BPF perf_event map */ + evsel = evlist__find_evsel_by_str(evlist, OFFCPU_EVENT); + if (evsel == NULL) { + pr_err("%s evsel not found\n", OFFCPU_EVENT); + return; + } + + perf_cpu_map__for_each_cpu(pcpu, i, evsel->core.cpus) { + int err; + int cpu_nr = pcpu.cpu; + + err = bpf_map__update_elem(skel->maps.offcpu_output, &cpu_nr, sizeof(int), + xyarray__entry(evsel->core.fd, cpu_nr, 0), + sizeof(int), BPF_ANY); + if (err) { + pr_err("Failed to update perf event map for direct off-cpu dumping\n"); + return; + } + } + skel->bss->enabled = 1; } diff --git a/tools/perf/util/bpf_skel/off_cpu.bpf.c b/tools/perf/util/bpf_skel/off_cpu.bpf.c index c152116df72f..a5002e25b259 100644 --- a/tools/perf/util/bpf_skel/off_cpu.bpf.c +++ b/tools/perf/util/bpf_skel/off_cpu.bpf.c @@ -18,6 +18,8 @@ #define MAX_STACKS 32 #define MAX_ENTRIES 102400 +#define MAX_CPUS 4096 + struct tstamp_data { __u32 stack_id; __u32 state; @@ -40,6 +42,13 @@ struct { } stacks SEC(".maps"); struct { + __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); + __uint(key_size, sizeof(int)); + __uint(value_size, sizeof(int)); + __uint(max_entries, MAX_CPUS); +} offcpu_output SEC(".maps"); + +struct { __uint(type, BPF_MAP_TYPE_TASK_STORAGE); __uint(map_flags, BPF_F_NO_PREALLOC); __type(key, int); |