Messages in this thread | | | Date | Fri, 20 Dec 2019 10:33:35 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH 1/9] perf/core: Add PERF_RECORD_CGROUP event |
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On Fri, Dec 20, 2019 at 01:32:45PM +0900, Namhyung Kim wrote: > To support cgroup tracking, add CGROUP event to save a link between > cgroup path and inode number. The attr.cgroup bit was also added to > enable cgroup tracking from userspace. > > This event will be generated when a new cgroup becomes active. > Userspace might need to synthesize those events for existing cgroups. > > Cc: Tejun Heo <tj@kernel.org> > Cc: Li Zefan <lizefan@huawei.com> > Cc: Johannes Weiner <hannes@cmpxchg.org> > Cc: Adrian Hunter <adrian.hunter@intel.com> > Signed-off-by: Namhyung Kim <namhyung@kernel.org>
TJ, is this the right thing to do? ISTR you had concerns on this topic on the past.
> --- > include/uapi/linux/perf_event.h | 14 +++- > kernel/events/core.c | 112 ++++++++++++++++++++++++++++++++ > 2 files changed, 125 insertions(+), 1 deletion(-) > > diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h > index 377d794d3105..7bae2d3380a6 100644 > --- a/include/uapi/linux/perf_event.h > +++ b/include/uapi/linux/perf_event.h > @@ -377,7 +377,8 @@ struct perf_event_attr { > ksymbol : 1, /* include ksymbol events */ > bpf_event : 1, /* include bpf events */ > aux_output : 1, /* generate AUX records instead of events */ > - __reserved_1 : 32; > + cgroup : 1, /* include cgroup events */ > + __reserved_1 : 31; > > union { > __u32 wakeup_events; /* wakeup every n events */ > @@ -1006,6 +1007,17 @@ enum perf_event_type { > */ > PERF_RECORD_BPF_EVENT = 18, > > + /* > + * struct { > + * struct perf_event_header header; > + * u64 id; > + * u64 path_len;
You can leave out path_len (also u64 for a length field is silly).
> + * char path[]; > + * struct sample_id sample_id; > + * }; > + */ > + PERF_RECORD_CGROUP = 19,
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