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perf kwork: Add workqueue trace BPF support 

Implements workqueue trace bpf function.

Test cases:

  # perf kwork -k workqueue lat -b
  Starting trace, Hit <Ctrl+C> to stop and report
  ^C
    Kwork Name                     | Cpu  | Avg delay     | Count     | Max delay     | Max delay start     | Max delay end       |
   --------------------------------------------------------------------------------------------------------------------------------
    (w)addrconf_verify_work        | 0002 |      5.856 ms |         1 |      5.856 ms |     111994.634313 s |     111994.640169 s |
    (w)vmstat_update               | 0001 |      1.247 ms |         1 |      1.247 ms |     111996.462651 s |     111996.463899 s |
    (w)neigh_periodic_work         | 0001 |      1.183 ms |         1 |      1.183 ms |     111996.462789 s |     111996.463973 s |
    (w)neigh_managed_work          | 0001 |      0.989 ms |         2 |      1.635 ms |     111996.462820 s |     111996.464455 s |
    (w)wb_workfn                   | 0000 |      0.667 ms |         1 |      0.667 ms |     111996.384273 s |     111996.384940 s |
    (w)bpf_prog_free_deferred      | 0001 |      0.495 ms |         1 |      0.495 ms |     111986.314201 s |     111986.314696 s |
    (w)mix_interrupt_randomness    | 0002 |      0.421 ms |         6 |      0.749 ms |     111995.927750 s |     111995.928499 s |
    (w)vmstat_shepherd             | 0000 |      0.374 ms |         2 |      0.385 ms |     111991.265242 s |     111991.265627 s |
    (w)e1000_watchdog              | 0002 |      0.356 ms |         5 |      0.390 ms |     111994.528380 s |     111994.528770 s |
    (w)vmstat_update               | 0000 |      0.231 ms |         2 |      0.365 ms |     111996.384407 s |     111996.384772 s |
    (w)flush_to_ldisc              | 0006 |      0.165 ms |         1 |      0.165 ms |     111995.930606 s |     111995.930771 s |
    (w)flush_to_ldisc              | 0000 |      0.094 ms |         2 |      0.095 ms |     111996.460453 s |     111996.460548 s |
   --------------------------------------------------------------------------------------------------------------------------------

  # perf kwork -k workqueue rep -b
  Starting trace, Hit <Ctrl+C> to stop and report
  ^C
    Kwork Name                     | Cpu  | Total Runtime | Count     | Max runtime   | Max runtime start   | Max runtime end     |
   --------------------------------------------------------------------------------------------------------------------------------
    (w)e1000_watchdog              | 0002 |      0.627 ms |         2 |      0.324 ms |     112002.720665 s |     112002.720989 s |
    (w)flush_to_ldisc              | 0007 |      0.598 ms |         2 |      0.534 ms |     112000.875226 s |     112000.875761 s |
    (w)wq_barrier_func             | 0007 |      0.492 ms |         1 |      0.492 ms |     112000.876981 s |     112000.877473 s |
    (w)flush_to_ldisc              | 0007 |      0.281 ms |         1 |      0.281 ms |     112005.826882 s |     112005.827163 s |
    (w)mix_interrupt_randomness    | 0002 |      0.229 ms |         3 |      0.102 ms |     112005.825671 s |     112005.825774 s |
    (w)vmstat_shepherd             | 0000 |      0.202 ms |         1 |      0.202 ms |     112001.504511 s |     112001.504713 s |
    (w)bpf_prog_free_deferred      | 0001 |      0.181 ms |         1 |      0.181 ms |     112000.883251 s |     112000.883432 s |
    (w)wb_workfn                   | 0007 |      0.130 ms |         1 |      0.130 ms |     112001.505195 s |     112001.505325 s |
    (w)vmstat_update               | 0000 |      0.053 ms |         1 |      0.053 ms |     112001.504763 s |     112001.504815 s |
   --------------------------------------------------------------------------------------------------------------------------------

Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Clarke <pc@us.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220709015033.38326-18-yangjihong1@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Yang Jihong 2022-07-09 09:50:33 +08:00 committed by Arnaldo Carvalho de Melo
parent 5a81927a40
commit acfb65fe1d
2 changed files with 101 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
tools/perf/util/bpf_kwork.c
View File

@ -114,11 +114,27 @@ static struct kwork_class_bpf kwork_softirq_bpf = {
.get_work_name = get_work_name_from_map,
};
static void workqueue_load_prepare(struct perf_kwork *kwork)
{
if (kwork->report == KWORK_REPORT_RUNTIME) {
bpf_program__set_autoload(skel->progs.report_workqueue_execute_start, true);
bpf_program__set_autoload(skel->progs.report_workqueue_execute_end, true);
} else if (kwork->report == KWORK_REPORT_LATENCY) {
bpf_program__set_autoload(skel->progs.latency_workqueue_activate_work, true);
bpf_program__set_autoload(skel->progs.latency_workqueue_execute_start, true);
}
}
static struct kwork_class_bpf kwork_workqueue_bpf = {
.load_prepare = workqueue_load_prepare,
.get_work_name = get_work_name_from_map,
};
static struct kwork_class_bpf *
kwork_class_bpf_supported_list[KWORK_CLASS_MAX] = {
[KWORK_CLASS_IRQ] = &kwork_irq_bpf,
[KWORK_CLASS_SOFTIRQ] = &kwork_softirq_bpf,
[KWORK_CLASS_WORKQUEUE] = NULL,
[KWORK_CLASS_WORKQUEUE] = &kwork_workqueue_bpf,
};
static bool valid_kwork_class_type(enum kwork_class_type type)

84
tools/perf/util/bpf_skel/kwork_trace.bpf.c
View File

@ -167,6 +167,15 @@ static __always_inline void do_update_name(void *map,
bpf_map_update_elem(map, key, name, BPF_ANY);
}
static __always_inline int update_timestart(void *map, struct work_key *key)
{
if (!trace_event_match(key, NULL))
return 0;
do_update_timestart(map, key);
return 0;
}
static __always_inline int update_timestart_and_name(void *time_map,
void *names_map,
struct work_key *key,
@ -192,6 +201,21 @@ static __always_inline int update_timeend(void *report_map,
return 0;
}
static __always_inline int update_timeend_and_name(void *report_map,
void *time_map,
void *names_map,
struct work_key *key,
char *name)
{
if (!trace_event_match(key, name))
return 0;
do_update_timeend(report_map, time_map, key);
do_update_name(names_map, key, name);
return 0;
}
SEC("tracepoint/irq/irq_handler_entry")
int report_irq_handler_entry(struct trace_event_raw_irq_handler_entry *ctx)
{
@ -296,4 +320,64 @@ int latency_softirq_entry(struct trace_event_raw_softirq *ctx)
return update_timeend(&perf_kwork_report, &perf_kwork_time, &key);
}
SEC("tracepoint/workqueue/workqueue_execute_start")
int report_workqueue_execute_start(struct trace_event_raw_workqueue_execute_start *ctx)
{
struct work_key key = {
.type = KWORK_CLASS_WORKQUEUE,
.cpu = bpf_get_smp_processor_id(),
.id = (__u64)ctx->work,
};
return update_timestart(&perf_kwork_time, &key);
}
SEC("tracepoint/workqueue/workqueue_execute_end")
int report_workqueue_execute_end(struct trace_event_raw_workqueue_execute_end *ctx)
{
char name[MAX_KWORKNAME];
struct work_key key = {
.type = KWORK_CLASS_WORKQUEUE,
.cpu = bpf_get_smp_processor_id(),
.id = (__u64)ctx->work,
};
unsigned long long func_addr = (unsigned long long)ctx->function;
__builtin_memset(name, 0, sizeof(name));
bpf_snprintf(name, sizeof(name), "%ps", &func_addr, sizeof(func_addr));
return update_timeend_and_name(&perf_kwork_report, &perf_kwork_time,
&perf_kwork_names, &key, name);
}
SEC("tracepoint/workqueue/workqueue_activate_work")
int latency_workqueue_activate_work(struct trace_event_raw_workqueue_activate_work *ctx)
{
struct work_key key = {
.type = KWORK_CLASS_WORKQUEUE,
.cpu = bpf_get_smp_processor_id(),
.id = (__u64)ctx->work,
};
return update_timestart(&perf_kwork_time, &key);
}
SEC("tracepoint/workqueue/workqueue_execute_start")
int latency_workqueue_execute_start(struct trace_event_raw_workqueue_execute_start *ctx)
{
char name[MAX_KWORKNAME];
struct work_key key = {
.type = KWORK_CLASS_WORKQUEUE,
.cpu = bpf_get_smp_processor_id(),
.id = (__u64)ctx->work,
};
unsigned long long func_addr = (unsigned long long)ctx->function;
__builtin_memset(name, 0, sizeof(name));
bpf_snprintf(name, sizeof(name), "%ps", &func_addr, sizeof(func_addr));
return update_timeend_and_name(&perf_kwork_report, &perf_kwork_time,
&perf_kwork_names, &key, name);
}
char LICENSE[] SEC("license") = "Dual BSD/GPL";