Messages in this thread | | | Date | Tue, 24 Mar 2015 12:07:36 +0100 | From | Jiri Olsa <> | Subject | Re: [PATCH v9 06/14] perf: Add AUX record |
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On Wed, Jan 14, 2015 at 02:18:15PM +0200, Alexander Shishkin wrote: > When there's new data in the AUX space, output a record indicating its > offset and size and a set of flags, such as PERF_AUX_FLAG_TRUNCATED, to > mean the described data was truncated to fit in the ring buffer. > > Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> > Cc: Arnaldo Carvalho de Melo <acme@infradead.org> > --- > include/uapi/linux/perf_event.h | 19 +++++++++++++++++++ > kernel/events/core.c | 34 ++++++++++++++++++++++++++++++++++ > kernel/events/internal.h | 3 +++ > 3 files changed, 56 insertions(+) > > diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h > index b7ccdf5e93..2d40e2aa07 100644 > --- a/include/uapi/linux/perf_event.h > +++ b/include/uapi/linux/perf_event.h > @@ -746,6 +746,20 @@ enum perf_event_type { > */ > PERF_RECORD_MMAP2 = 10, > > + /* > + * Records that new data landed in the AUX buffer part. > + * > + * struct { > + * struct perf_event_header header; > + * > + * u64 aux_offset; > + * u64 aux_size; > + * u64 flags; > + * struct sample_id sample_id;
hum, I dont see sample_id below in implementation
jirka
> + * }; > + */ > + PERF_RECORD_AUX = 11, > + > PERF_RECORD_MAX, /* non-ABI */ > }; > > @@ -763,6 +777,11 @@ enum perf_callchain_context { > PERF_CONTEXT_MAX = (__u64)-4095, > }; > > +/** > + * PERF_RECORD_AUX::flags bits > + */ > +#define PERF_AUX_FLAG_TRUNCATED 0x01 /* record was truncated to fit */ > + > #define PERF_FLAG_FD_NO_GROUP (1UL << 0) > #define PERF_FLAG_FD_OUTPUT (1UL << 1) > #define PERF_FLAG_PID_CGROUP (1UL << 2) /* pid=cgroup id, per-cpu mode only */ > diff --git a/kernel/events/core.c b/kernel/events/core.c > index a6a145ad0b..4e17393264 100644 > --- a/kernel/events/core.c > +++ b/kernel/events/core.c > @@ -5648,6 +5648,40 @@ void perf_event_mmap(struct vm_area_struct *vma) > perf_event_mmap_event(&mmap_event); > } > > +void perf_event_aux_event(struct perf_event *event, unsigned long head, > + unsigned long size, u64 flags) > +{ > + struct perf_output_handle handle; > + struct perf_sample_data sample; > + struct perf_aux_event { > + struct perf_event_header header; > + u64 offset; > + u64 size; > + u64 flags; > + } rec = { > + .header = { > + .type = PERF_RECORD_AUX, > + .misc = 0, > + .size = sizeof(rec), > + }, > + .offset = head, > + .size = size, > + .flags = flags, > + }; > + int ret; > + > + perf_event_header__init_id(&rec.header, &sample, event); > + ret = perf_output_begin(&handle, event, rec.header.size); > + > + if (ret) > + return; > + > + perf_output_put(&handle, rec); > + perf_event__output_id_sample(event, &handle, &sample); > + > + perf_output_end(&handle); > +} > + > /* > * IRQ throttle logging > */ > diff --git a/kernel/events/internal.h b/kernel/events/internal.h > index 0f6d080159..4d117a9814 100644 > --- a/kernel/events/internal.h > +++ b/kernel/events/internal.h > @@ -62,6 +62,9 @@ static inline bool rb_has_aux(struct ring_buffer *rb) > return !!rb->aux_nr_pages; > } > > +void perf_event_aux_event(struct perf_event *event, unsigned long head, > + unsigned long size, u64 flags); > + > extern void > perf_event_header__init_id(struct perf_event_header *header, > struct perf_sample_data *data, > -- > 2.1.4 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
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