Hello.
On 10/12/2015 12:02 PM, Kaixu Xia wrote:
In some scenarios we don't want to output trace data when sampling
to reduce overhead. This patch adds the flag sample_disable to
implement this function. By setting this flag and integrating with
ebpf, we can control the data output process and g
On 10/12/15 7:30 PM, xiakaixu wrote:
The proper perf_event_enable/disable are so heavy that another
>mechanism needed? cpu_function_call is probably too much to do
>from bpf program, but that can be simplified?
>Based on the use case from cover letter, sounds like you want
>something like soft_di
δΊ 2015/10/13 3:20, Alexei Starovoitov ει:
> On 10/12/15 2:02 AM, Kaixu Xia wrote:
>> diff --git a/include/linux/bpf.h b/include/linux/bpf.h
>> index f57d7fe..25e073d 100644
>> --- a/include/linux/bpf.h
>> +++ b/include/linux/bpf.h
>> @@ -39,6 +39,7 @@ struct bpf_map {
>> u32 max_entries;
>>
On 10/12/15 2:02 AM, Kaixu Xia wrote:
diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index f57d7fe..25e073d 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -39,6 +39,7 @@ struct bpf_map {
u32 max_entries;
const struct bpf_map_ops *ops;
struct work_str
Hi Kaixu,
[auto build test ERROR on tip/perf/core -- if it's inappropriate base, please
suggest rules for selecting the more suitable base]
url:
https://github.com/0day-ci/linux/commits/Kaixu-Xia/bpf-enable-disable-events-stored-in-PERF_EVENT_ARRAY-maps-trace-data-output-when-perf-sampling/2
On Mon, Oct 12, 2015 at 08:05:20PM +0800, Wangnan (F) wrote:
>
>
> On 2015/10/12 20:02, Peter Zijlstra wrote:
> >On Mon, Oct 12, 2015 at 09:02:42AM +, Kaixu Xia wrote:
> >>--- a/include/linux/perf_event.h
> >>+++ b/include/linux/perf_event.h
> >>@@ -483,6 +483,8 @@ struct perf_event {
> >>
On 2015/10/12 20:02, Peter Zijlstra wrote:
On Mon, Oct 12, 2015 at 09:02:42AM +, Kaixu Xia wrote:
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -483,6 +483,8 @@ struct perf_event {
perf_overflow_handler_t overflow_handler;
void
On Mon, Oct 12, 2015 at 09:02:42AM +, Kaixu Xia wrote:
> --- a/include/linux/perf_event.h
> +++ b/include/linux/perf_event.h
> @@ -483,6 +483,8 @@ struct perf_event {
> perf_overflow_handler_t overflow_handler;
> void*overflow_handler_context;
>
In some scenarios we don't want to output trace data when sampling
to reduce overhead. This patch adds the flag sample_disable to
implement this function. By setting this flag and integrating with
ebpf, we can control the data output process and get the samples we
are most interested in.
Signed-of
