Implements workqueue report function.
test case:
# perf kwork -k workqueue rep
Kwork Name | Cpu | Total Runtime | Frequency | Max runtime | Max runtime start | Max runtime end |
---------------------------------------------------------------------------------------------------------------------------
(w)0xffffffff83e09fa0 | 0001 | 2152.678 ms | 194 | 12.376 ms | 2059361.546621 s | 2059361.558997 s |
(w)0xffff888332fea180 | 0000 | 17.125 ms | 301 | 1.018 ms | 2059358.441070 s | 2059358.442089 s |
(w)0xffff8881035a83d8 | 0007 | 7.556 ms | 3 | 3.212 ms | 2059362.614643 s | 2059362.617855 s |
(w)0xffff888102fc14a0 | 0002 | 7.080 ms | 5 | 1.962 ms | 2059365.421753 s | 2059365.423714 s |
(w)0xffffffff82f7da00 | 0000 | 4.277 ms | 7 | 3.778 ms | 2059360.851063 s | 2059360.854841 s |
(w)0xffffffff8305d680 | 0006 | 1.796 ms | 1 | 1.796 ms | 2059360.046818 s | 2059360.048613 s |
(w)0xffff8883339e9040 | 0005 | 1.659 ms | 2 | 1.619 ms | 2059361.266051 s | 2059361.267670 s |
(w)0xffff888333de9040 | 0007 | 1.121 ms | 5 | 0.783 ms | 2059368.238059 s | 2059368.238842 s |
(w)0xffff888332fe9040 | 0000 | 0.990 ms | 4 | 0.911 ms | 2059359.604075 s | 2059359.604986 s |
(w)0xffff8883331e9040 | 0001 | 0.244 ms | 6 | 0.046 ms | 2059362.689277 s | 2059362.689323 s |
(w)0xffff888102e44400 | 0007 | 0.239 ms | 2 | 0.137 ms | 2059363.117537 s | 2059363.117674 s |
(w)0xffff8883333ea180 | 0002 | 0.141 ms | 5 | 0.049 ms | 2059365.423784 s | 2059365.423833 s |
(w)0xffffffff83062f28 | 0006 | 0.084 ms | 2 | 0.047 ms | 2059358.208033 s | 2059358.208080 s |
(w)0xffffffff8305ca48 | 0003 | 0.078 ms | 2 | 0.041 ms | 2059361.071371 s | 2059361.071412 s |
(w)0xffff8883337e9040 | 0004 | 0.062 ms | 1 | 0.062 ms | 2059362.605723 s | 2059362.605785 s |
(w)0xffff8881035a81e8 | 0001 | 0.056 ms | 1 | 0.056 ms | 2059363.118231 s | 2059363.118287 s |
(w)0xffff8883335e9040 | 0003 | 0.026 ms | 1 | 0.026 ms | 2059358.573397 s | 2059358.573423 s |
(w)0xffffffff83062e70 | 0006 | 0.023 ms | 1 | 0.023 ms | 2059368.398864 s | 2059368.398888 s |
(w)0xffffffff83e06480 | 0002 | 0.000 ms | 1 | 0.000 ms | 2059359.986792 s | 2059359.986792 s |
---------------------------------------------------------------------------------------------------------------------------
Signed-off-by: Yang Jihong <[email protected]>
---
tools/perf/builtin-kwork.c | 65 ++++++++++++++++++++++++++++++++++++--
1 file changed, 63 insertions(+), 2 deletions(-)
diff --git a/tools/perf/builtin-kwork.c b/tools/perf/builtin-kwork.c
index 1eb416faf8ef..f27ffad223a3 100644
--- a/tools/perf/builtin-kwork.c
+++ b/tools/perf/builtin-kwork.c
@@ -813,16 +813,77 @@ static struct kwork_class kwork_softirq = {
.cluster_name = softirq_cluster_name,
};
+static struct kwork_class kwork_workqueue;
+static int process_workqueue_execute_start_event(struct perf_tool *tool,
+ struct evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ struct perf_kwork *kwork = container_of(tool, struct perf_kwork, tool);
+
+ if (kwork->tp_handler->entry_event)
+ return kwork->tp_handler->entry_event(kwork, &kwork_workqueue,
+ evsel, sample, machine);
+
+ return 0;
+}
+
+static int process_workqueue_execute_end_event(struct perf_tool *tool,
+ struct evsel *evsel,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ struct perf_kwork *kwork = container_of(tool, struct perf_kwork, tool);
+
+ if (kwork->tp_handler->exit_event)
+ return kwork->tp_handler->exit_event(kwork, &kwork_workqueue,
+ evsel, sample, machine);
+
+ return 0;
+}
+
const struct evsel_str_handler workqueue_tp_handlers[] = {
{ "workqueue:workqueue_activate_work", NULL, },
- { "workqueue:workqueue_execute_start", NULL, },
- { "workqueue:workqueue_execute_end", NULL, },
+ { "workqueue:workqueue_execute_start", process_workqueue_execute_start_event, },
+ { "workqueue:workqueue_execute_end", process_workqueue_execute_end_event, },
};
+static int workqueue_class_init(struct kwork_class *class,
+ struct perf_session *session)
+{
+ if (perf_session__set_tracepoints_handlers(session,
+ workqueue_tp_handlers)) {
+ pr_debug("Failed to set workqueue tracepoints handlers\n");
+ return -1;
+ }
+
+ class->cluster_root = RB_ROOT_CACHED;
+ return 0;
+}
+
+static void workqueue_cluster_init(struct kwork_class *class,
+ struct kwork_cluster *cluster,
+ struct evsel *evsel,
+ struct perf_sample *sample)
+{
+ cluster->name = NULL;
+ cluster->class = class;
+ cluster->cpu = sample->cpu;
+ cluster->id = evsel__intval(evsel, sample, "work");
+}
+
+static void workqueue_cluster_name(struct kwork_cluster *cluster, char *buf, int len)
+{
+ snprintf(buf, len, "(w)0x%" PRIx64, cluster->id);
+}
+
static struct kwork_class kwork_workqueue = {
.name = "workqueue",
.nr_tracepoints = 3,
.tp_handlers = workqueue_tp_handlers,
+ .class_init = workqueue_class_init,
+ .cluster_init = workqueue_cluster_init,
+ .cluster_name = workqueue_cluster_name,
};
static struct kwork_class *kwork_class_supported_list[KWORK_CLASS_MAX] = {
--
2.30.GIT
On Mon, Jun 13, 2022 at 2:48 AM Yang Jihong <[email protected]> wrote:
>
> Implements workqueue report function.
>
> test case:
>
> # perf kwork -k workqueue rep
>
> Kwork Name | Cpu | Total Runtime | Frequency | Max runtime | Max runtime start | Max runtime end |
> ---------------------------------------------------------------------------------------------------------------------------
> (w)0xffffffff83e09fa0 | 0001 | 2152.678 ms | 194 | 12.376 ms | 2059361.546621 s | 2059361.558997 s |
> (w)0xffff888332fea180 | 0000 | 17.125 ms | 301 | 1.018 ms | 2059358.441070 s | 2059358.442089 s |
> (w)0xffff8881035a83d8 | 0007 | 7.556 ms | 3 | 3.212 ms | 2059362.614643 s | 2059362.617855 s |
> (w)0xffff888102fc14a0 | 0002 | 7.080 ms | 5 | 1.962 ms | 2059365.421753 s | 2059365.423714 s |
> (w)0xffffffff82f7da00 | 0000 | 4.277 ms | 7 | 3.778 ms | 2059360.851063 s | 2059360.854841 s |
> (w)0xffffffff8305d680 | 0006 | 1.796 ms | 1 | 1.796 ms | 2059360.046818 s | 2059360.048613 s |
> (w)0xffff8883339e9040 | 0005 | 1.659 ms | 2 | 1.619 ms | 2059361.266051 s | 2059361.267670 s |
> (w)0xffff888333de9040 | 0007 | 1.121 ms | 5 | 0.783 ms | 2059368.238059 s | 2059368.238842 s |
> (w)0xffff888332fe9040 | 0000 | 0.990 ms | 4 | 0.911 ms | 2059359.604075 s | 2059359.604986 s |
> (w)0xffff8883331e9040 | 0001 | 0.244 ms | 6 | 0.046 ms | 2059362.689277 s | 2059362.689323 s |
> (w)0xffff888102e44400 | 0007 | 0.239 ms | 2 | 0.137 ms | 2059363.117537 s | 2059363.117674 s |
> (w)0xffff8883333ea180 | 0002 | 0.141 ms | 5 | 0.049 ms | 2059365.423784 s | 2059365.423833 s |
> (w)0xffffffff83062f28 | 0006 | 0.084 ms | 2 | 0.047 ms | 2059358.208033 s | 2059358.208080 s |
> (w)0xffffffff8305ca48 | 0003 | 0.078 ms | 2 | 0.041 ms | 2059361.071371 s | 2059361.071412 s |
> (w)0xffff8883337e9040 | 0004 | 0.062 ms | 1 | 0.062 ms | 2059362.605723 s | 2059362.605785 s |
> (w)0xffff8881035a81e8 | 0001 | 0.056 ms | 1 | 0.056 ms | 2059363.118231 s | 2059363.118287 s |
> (w)0xffff8883335e9040 | 0003 | 0.026 ms | 1 | 0.026 ms | 2059358.573397 s | 2059358.573423 s |
> (w)0xffffffff83062e70 | 0006 | 0.023 ms | 1 | 0.023 ms | 2059368.398864 s | 2059368.398888 s |
> (w)0xffffffff83e06480 | 0002 | 0.000 ms | 1 | 0.000 ms | 2059359.986792 s | 2059359.986792 s |
Using "function" in the tracepoint and symbolizing it would be
far more intuitive.
Thanks,
Namhyung
> ---------------------------------------------------------------------------------------------------------------------------
>
> Signed-off-by: Yang Jihong <[email protected]>
> ---
> tools/perf/builtin-kwork.c | 65 ++++++++++++++++++++++++++++++++++++--
> 1 file changed, 63 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/builtin-kwork.c b/tools/perf/builtin-kwork.c
> index 1eb416faf8ef..f27ffad223a3 100644
> --- a/tools/perf/builtin-kwork.c
> +++ b/tools/perf/builtin-kwork.c
> @@ -813,16 +813,77 @@ static struct kwork_class kwork_softirq = {
> .cluster_name = softirq_cluster_name,
> };
>
> +static struct kwork_class kwork_workqueue;
> +static int process_workqueue_execute_start_event(struct perf_tool *tool,
> + struct evsel *evsel,
> + struct perf_sample *sample,
> + struct machine *machine)
> +{
> + struct perf_kwork *kwork = container_of(tool, struct perf_kwork, tool);
> +
> + if (kwork->tp_handler->entry_event)
> + return kwork->tp_handler->entry_event(kwork, &kwork_workqueue,
> + evsel, sample, machine);
> +
> + return 0;
> +}
> +
> +static int process_workqueue_execute_end_event(struct perf_tool *tool,
> + struct evsel *evsel,
> + struct perf_sample *sample,
> + struct machine *machine)
> +{
> + struct perf_kwork *kwork = container_of(tool, struct perf_kwork, tool);
> +
> + if (kwork->tp_handler->exit_event)
> + return kwork->tp_handler->exit_event(kwork, &kwork_workqueue,
> + evsel, sample, machine);
> +
> + return 0;
> +}
> +
> const struct evsel_str_handler workqueue_tp_handlers[] = {
> { "workqueue:workqueue_activate_work", NULL, },
> - { "workqueue:workqueue_execute_start", NULL, },
> - { "workqueue:workqueue_execute_end", NULL, },
> + { "workqueue:workqueue_execute_start", process_workqueue_execute_start_event, },
> + { "workqueue:workqueue_execute_end", process_workqueue_execute_end_event, },
> };
>
> +static int workqueue_class_init(struct kwork_class *class,
> + struct perf_session *session)
> +{
> + if (perf_session__set_tracepoints_handlers(session,
> + workqueue_tp_handlers)) {
> + pr_debug("Failed to set workqueue tracepoints handlers\n");
> + return -1;
> + }
> +
> + class->cluster_root = RB_ROOT_CACHED;
> + return 0;
> +}
> +
> +static void workqueue_cluster_init(struct kwork_class *class,
> + struct kwork_cluster *cluster,
> + struct evsel *evsel,
> + struct perf_sample *sample)
> +{
> + cluster->name = NULL;
> + cluster->class = class;
> + cluster->cpu = sample->cpu;
> + cluster->id = evsel__intval(evsel, sample, "work");
> +}
> +
> +static void workqueue_cluster_name(struct kwork_cluster *cluster, char *buf, int len)
> +{
> + snprintf(buf, len, "(w)0x%" PRIx64, cluster->id);
> +}
> +
> static struct kwork_class kwork_workqueue = {
> .name = "workqueue",
> .nr_tracepoints = 3,
> .tp_handlers = workqueue_tp_handlers,
> + .class_init = workqueue_class_init,
> + .cluster_init = workqueue_cluster_init,
> + .cluster_name = workqueue_cluster_name,
> };
>
> static struct kwork_class *kwork_class_supported_list[KWORK_CLASS_MAX] = {
> --
> 2.30.GIT
>
Hello,
On 2022/6/15 5:54, Namhyung Kim wrote:
> On Mon, Jun 13, 2022 at 2:48 AM Yang Jihong <[email protected]> wrote:
>>
>> Implements workqueue report function.
>>
>> test case:
>>
>> # perf kwork -k workqueue rep
>>
>> Kwork Name | Cpu | Total Runtime | Frequency | Max runtime | Max runtime start | Max runtime end |
>> ---------------------------------------------------------------------------------------------------------------------------
>> (w)0xffffffff83e09fa0 | 0001 | 2152.678 ms | 194 | 12.376 ms | 2059361.546621 s | 2059361.558997 s |
>> (w)0xffff888332fea180 | 0000 | 17.125 ms | 301 | 1.018 ms | 2059358.441070 s | 2059358.442089 s |
>> (w)0xffff8881035a83d8 | 0007 | 7.556 ms | 3 | 3.212 ms | 2059362.614643 s | 2059362.617855 s |
>> (w)0xffff888102fc14a0 | 0002 | 7.080 ms | 5 | 1.962 ms | 2059365.421753 s | 2059365.423714 s |
>> (w)0xffffffff82f7da00 | 0000 | 4.277 ms | 7 | 3.778 ms | 2059360.851063 s | 2059360.854841 s |
>> (w)0xffffffff8305d680 | 0006 | 1.796 ms | 1 | 1.796 ms | 2059360.046818 s | 2059360.048613 s |
>> (w)0xffff8883339e9040 | 0005 | 1.659 ms | 2 | 1.619 ms | 2059361.266051 s | 2059361.267670 s |
>> (w)0xffff888333de9040 | 0007 | 1.121 ms | 5 | 0.783 ms | 2059368.238059 s | 2059368.238842 s |
>> (w)0xffff888332fe9040 | 0000 | 0.990 ms | 4 | 0.911 ms | 2059359.604075 s | 2059359.604986 s |
>> (w)0xffff8883331e9040 | 0001 | 0.244 ms | 6 | 0.046 ms | 2059362.689277 s | 2059362.689323 s |
>> (w)0xffff888102e44400 | 0007 | 0.239 ms | 2 | 0.137 ms | 2059363.117537 s | 2059363.117674 s |
>> (w)0xffff8883333ea180 | 0002 | 0.141 ms | 5 | 0.049 ms | 2059365.423784 s | 2059365.423833 s |
>> (w)0xffffffff83062f28 | 0006 | 0.084 ms | 2 | 0.047 ms | 2059358.208033 s | 2059358.208080 s |
>> (w)0xffffffff8305ca48 | 0003 | 0.078 ms | 2 | 0.041 ms | 2059361.071371 s | 2059361.071412 s |
>> (w)0xffff8883337e9040 | 0004 | 0.062 ms | 1 | 0.062 ms | 2059362.605723 s | 2059362.605785 s |
>> (w)0xffff8881035a81e8 | 0001 | 0.056 ms | 1 | 0.056 ms | 2059363.118231 s | 2059363.118287 s |
>> (w)0xffff8883335e9040 | 0003 | 0.026 ms | 1 | 0.026 ms | 2059358.573397 s | 2059358.573423 s |
>> (w)0xffffffff83062e70 | 0006 | 0.023 ms | 1 | 0.023 ms | 2059368.398864 s | 2059368.398888 s |
>> (w)0xffffffff83e06480 | 0002 | 0.000 ms | 1 | 0.000 ms | 2059359.986792 s | 2059359.986792 s |
>
> Using "function" in the tracepoint and symbolizing it would be
> far more intuitive.
>
OK，This is a simplified version that will be improved in the next
version, and I'd like to add the following features:
1. Supports the kthread profile.
2. Save runtime and latency in kernel using ebpf(similar to "perf
record: Implement off-cpu profiling with BPF") . This reduces the number
of interruptions caused by writing files to hard disks, which is closer
to the actual scenario.
This RFC is sent to discuss to see if this function is useful to the
community and can be accepted by the community. :)
Thanks,
Jihong
.
On Tue, Jun 14, 2022 at 8:22 PM Yang Jihong <[email protected]> wrote:
>
> Hello,
>
> On 2022/6/15 5:54, Namhyung Kim wrote:
> > On Mon, Jun 13, 2022 at 2:48 AM Yang Jihong <[email protected]> wrote:
> >>
> >> Implements workqueue report function.
> >>
> >> test case:
> >>
> >> # perf kwork -k workqueue rep
> >>
> >> Kwork Name | Cpu | Total Runtime | Frequency | Max runtime | Max runtime start | Max runtime end |
> >> ---------------------------------------------------------------------------------------------------------------------------
> >> (w)0xffffffff83e09fa0 | 0001 | 2152.678 ms | 194 | 12.376 ms | 2059361.546621 s | 2059361.558997 s |
> >> (w)0xffff888332fea180 | 0000 | 17.125 ms | 301 | 1.018 ms | 2059358.441070 s | 2059358.442089 s |
> >> (w)0xffff8881035a83d8 | 0007 | 7.556 ms | 3 | 3.212 ms | 2059362.614643 s | 2059362.617855 s |
> >> (w)0xffff888102fc14a0 | 0002 | 7.080 ms | 5 | 1.962 ms | 2059365.421753 s | 2059365.423714 s |
> >> (w)0xffffffff82f7da00 | 0000 | 4.277 ms | 7 | 3.778 ms | 2059360.851063 s | 2059360.854841 s |
> >> (w)0xffffffff8305d680 | 0006 | 1.796 ms | 1 | 1.796 ms | 2059360.046818 s | 2059360.048613 s |
> >> (w)0xffff8883339e9040 | 0005 | 1.659 ms | 2 | 1.619 ms | 2059361.266051 s | 2059361.267670 s |
> >> (w)0xffff888333de9040 | 0007 | 1.121 ms | 5 | 0.783 ms | 2059368.238059 s | 2059368.238842 s |
> >> (w)0xffff888332fe9040 | 0000 | 0.990 ms | 4 | 0.911 ms | 2059359.604075 s | 2059359.604986 s |
> >> (w)0xffff8883331e9040 | 0001 | 0.244 ms | 6 | 0.046 ms | 2059362.689277 s | 2059362.689323 s |
> >> (w)0xffff888102e44400 | 0007 | 0.239 ms | 2 | 0.137 ms | 2059363.117537 s | 2059363.117674 s |
> >> (w)0xffff8883333ea180 | 0002 | 0.141 ms | 5 | 0.049 ms | 2059365.423784 s | 2059365.423833 s |
> >> (w)0xffffffff83062f28 | 0006 | 0.084 ms | 2 | 0.047 ms | 2059358.208033 s | 2059358.208080 s |
> >> (w)0xffffffff8305ca48 | 0003 | 0.078 ms | 2 | 0.041 ms | 2059361.071371 s | 2059361.071412 s |
> >> (w)0xffff8883337e9040 | 0004 | 0.062 ms | 1 | 0.062 ms | 2059362.605723 s | 2059362.605785 s |
> >> (w)0xffff8881035a81e8 | 0001 | 0.056 ms | 1 | 0.056 ms | 2059363.118231 s | 2059363.118287 s |
> >> (w)0xffff8883335e9040 | 0003 | 0.026 ms | 1 | 0.026 ms | 2059358.573397 s | 2059358.573423 s |
> >> (w)0xffffffff83062e70 | 0006 | 0.023 ms | 1 | 0.023 ms | 2059368.398864 s | 2059368.398888 s |
> >> (w)0xffffffff83e06480 | 0002 | 0.000 ms | 1 | 0.000 ms | 2059359.986792 s | 2059359.986792 s |
> >
> > Using "function" in the tracepoint and symbolizing it would be
> > far more intuitive.
> >
> OK，This is a simplified version that will be improved in the next
> version, and I'd like to add the following features:
> 1. Supports the kthread profile.
Could you elaborate more?
> 2. Save runtime and latency in kernel using ebpf(similar to "perf
> record: Implement off-cpu profiling with BPF") . This reduces the number
> of interruptions caused by writing files to hard disks, which is closer
> to the actual scenario.
Sounds great.
>
> This RFC is sent to discuss to see if this function is useful to the
> community and can be accepted by the community. :)
Yeah I think it'd be useful.
Thanks,
Namhyung
Hello,
On 2022/6/16 5:56, Namhyung Kim wrote:
> On Tue, Jun 14, 2022 at 8:22 PM Yang Jihong <[email protected]> wrote:
>>
>> Hello,
>>
>> On 2022/6/15 5:54, Namhyung Kim wrote:
>>> On Mon, Jun 13, 2022 at 2:48 AM Yang Jihong <[email protected]> wrote:
>>>>
>>>> Implements workqueue report function.
>>>>
>>>> test case:
>>>>
>>>> # perf kwork -k workqueue rep
>>>>
>>>> Kwork Name | Cpu | Total Runtime | Frequency | Max runtime | Max runtime start | Max runtime end |
>>>> ---------------------------------------------------------------------------------------------------------------------------
>>>> (w)0xffffffff83e09fa0 | 0001 | 2152.678 ms | 194 | 12.376 ms | 2059361.546621 s | 2059361.558997 s |
>>>> (w)0xffff888332fea180 | 0000 | 17.125 ms | 301 | 1.018 ms | 2059358.441070 s | 2059358.442089 s |
>>>> (w)0xffff8881035a83d8 | 0007 | 7.556 ms | 3 | 3.212 ms | 2059362.614643 s | 2059362.617855 s |
>>>> (w)0xffff888102fc14a0 | 0002 | 7.080 ms | 5 | 1.962 ms | 2059365.421753 s | 2059365.423714 s |
>>>> (w)0xffffffff82f7da00 | 0000 | 4.277 ms | 7 | 3.778 ms | 2059360.851063 s | 2059360.854841 s |
>>>> (w)0xffffffff8305d680 | 0006 | 1.796 ms | 1 | 1.796 ms | 2059360.046818 s | 2059360.048613 s |
>>>> (w)0xffff8883339e9040 | 0005 | 1.659 ms | 2 | 1.619 ms | 2059361.266051 s | 2059361.267670 s |
>>>> (w)0xffff888333de9040 | 0007 | 1.121 ms | 5 | 0.783 ms | 2059368.238059 s | 2059368.238842 s |
>>>> (w)0xffff888332fe9040 | 0000 | 0.990 ms | 4 | 0.911 ms | 2059359.604075 s | 2059359.604986 s |
>>>> (w)0xffff8883331e9040 | 0001 | 0.244 ms | 6 | 0.046 ms | 2059362.689277 s | 2059362.689323 s |
>>>> (w)0xffff888102e44400 | 0007 | 0.239 ms | 2 | 0.137 ms | 2059363.117537 s | 2059363.117674 s |
>>>> (w)0xffff8883333ea180 | 0002 | 0.141 ms | 5 | 0.049 ms | 2059365.423784 s | 2059365.423833 s |
>>>> (w)0xffffffff83062f28 | 0006 | 0.084 ms | 2 | 0.047 ms | 2059358.208033 s | 2059358.208080 s |
>>>> (w)0xffffffff8305ca48 | 0003 | 0.078 ms | 2 | 0.041 ms | 2059361.071371 s | 2059361.071412 s |
>>>> (w)0xffff8883337e9040 | 0004 | 0.062 ms | 1 | 0.062 ms | 2059362.605723 s | 2059362.605785 s |
>>>> (w)0xffff8881035a81e8 | 0001 | 0.056 ms | 1 | 0.056 ms | 2059363.118231 s | 2059363.118287 s |
>>>> (w)0xffff8883335e9040 | 0003 | 0.026 ms | 1 | 0.026 ms | 2059358.573397 s | 2059358.573423 s |
>>>> (w)0xffffffff83062e70 | 0006 | 0.023 ms | 1 | 0.023 ms | 2059368.398864 s | 2059368.398888 s |
>>>> (w)0xffffffff83e06480 | 0002 | 0.000 ms | 1 | 0.000 ms | 2059359.986792 s | 2059359.986792 s |
>>>
>>> Using "function" in the tracepoint and symbolizing it would be
>>> far more intuitive.
>>>
>> OK，This is a simplified version that will be improved in the next
>> version, and I'd like to add the following features:
>> 1. Supports the kthread profile.
>
> Could you elaborate more?
trace kthread tracepoints (sched:sched_kthread_work_queue_work, sched:
sched_kthread_work_execute_start and
sched:sched_kthread_work_execute_end) can support kthread profile,
because framework has been set up. we only need to add a new kthread
class class.
>
>> 2. Save runtime and latency in kernel using ebpf(similar to "perf
>> record: Implement off-cpu profiling with BPF") . This reduces the number
>> of interruptions caused by writing files to hard disks, which is closer
>> to the actual scenario.
>
> Sounds great.
OK, I'll add it in next version.
>
>>
>> This RFC is sent to discuss to see if this function is useful to the
>> community and can be accepted by the community. :)
>
> Yeah I think it'd be useful.
Thanks for your affirmation.
Thanks,
Jihong