Re: [PATCH 12/24] perf tools: Store build id from mmap2 events

From: Jiri Olsa
Date: Tue Nov 17 2020 - 09:38:41 EST

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In reply to: Arnaldo Carvalho de Melo: "Re: [PATCH 12/24] perf tools: Store build id from mmap2 events"
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On Tue, Nov 17, 2020 at 09:38:05AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, Nov 17, 2020 at 12:00:41PM +0100, Jiri Olsa escreveu:
> > When processing mmap2 event, check on the build id
> > misc bit: PERF_RECORD_MISC_BUILD_ID and if it's set,
> > store the build id in mmap's dso object.
> >
> > Also adding the build id data arts to struct
> > perf_record_mmap2 event definition.
> >
> > Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
> > ---
> > kernel/events/core.c | 4 ++++
> > tools/lib/perf/include/perf/event.h | 18 ++++++++++++++----
> > tools/perf/util/machine.c | 24 +++++++++++++++++++-----
> > tools/perf/util/map.c | 8 ++++++--
> > tools/perf/util/map.h | 3 ++-
> > 5 files changed, 45 insertions(+), 12 deletions(-)
>
> You mixed up kernel changes with tools/ changes, can you please split
> this up?
>
> Also there is an indentation problem in the kernel changes, which, I
> think, is just debugging cruft that you forgot to excise? :-)

mama mia.. sry, that's debug that slipped, there will
be new version for sure ;-)

jirka

>
> - Arnaldo
>
> > diff --git a/kernel/events/core.c b/kernel/events/core.c
> > index 5841b5bca68d..fa7f392c6c0c 100644
> > --- a/kernel/events/core.c
> > +++ b/kernel/events/core.c
> > @@ -8017,6 +8017,10 @@ static void perf_event_mmap_output(struct perf_event *event,
> >
> > __output_copy(&handle, size, 4);
> > __output_copy(&handle, mmap_event->build_id, BUILD_ID_SIZE);
> > +
> > +if (mmap_event->build_id_size > 20)
> > + trace_printk("build_id_size %u %s\n", mmap_event->build_id_size, mmap_event->file_name);
> > +
> > } else {
> > perf_output_put(&handle, mmap_event->maj);
> > perf_output_put(&handle, mmap_event->min);
> > diff --git a/tools/lib/perf/include/perf/event.h b/tools/lib/perf/include/perf/event.h
> > index 988c539bedb6..d82054225fcc 100644
> > --- a/tools/lib/perf/include/perf/event.h
> > +++ b/tools/lib/perf/include/perf/event.h
> > @@ -23,10 +23,20 @@ struct perf_record_mmap2 {
> > __u64 start;
> > __u64 len;
> > __u64 pgoff;
> > - __u32 maj;
> > - __u32 min;
> > - __u64 ino;
> > - __u64 ino_generation;
> > + union {
> > + struct {
> > + __u32 maj;
> > + __u32 min;
> > + __u64 ino;
> > + __u64 ino_generation;
> > + };
> > + struct {
> > + __u8 build_id_size;
> > + __u8 __reserved_1;
> > + __u16 __reserved_2;
> > + __u8 build_id[20];
> > + };
> > + };
> > __u32 prot;
> > __u32 flags;
> > char filename[PATH_MAX];
> > diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
> > index 1ae32a81639c..1edb7d10b042 100644
> > --- a/tools/perf/util/machine.c
> > +++ b/tools/perf/util/machine.c
> > @@ -1599,7 +1599,8 @@ static int machine__process_extra_kernel_map(struct machine *machine,
> > }
> >
> > static int machine__process_kernel_mmap_event(struct machine *machine,
> > - struct extra_kernel_map *xm)
> > + struct extra_kernel_map *xm,
> > + struct build_id *bid)
> > {
> > struct map *map;
> > enum dso_space_type dso_space;
> > @@ -1624,6 +1625,10 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
> > goto out_problem;
> >
> > map->end = map->start + xm->end - xm->start;
> > +
> > + if (build_id__is_defined(bid))
> > + dso__set_build_id(map->dso, bid);
> > +
> > } else if (is_kernel_mmap) {
> > const char *symbol_name = (xm->name + strlen(machine->mmap_name));
> > /*
> > @@ -1681,6 +1686,9 @@ static int machine__process_kernel_mmap_event(struct machine *machine,
> >
> > machine__update_kernel_mmap(machine, xm->start, xm->end);
> >
> > + if (build_id__is_defined(bid))
> > + dso__set_build_id(kernel, bid);
> > +
> > /*
> > * Avoid using a zero address (kptr_restrict) for the ref reloc
> > * symbol. Effectively having zero here means that at record
> > @@ -1718,11 +1726,17 @@ int machine__process_mmap2_event(struct machine *machine,
> > .ino = event->mmap2.ino,
> > .ino_generation = event->mmap2.ino_generation,
> > };
> > + struct build_id __bid, *bid = NULL;
> > int ret = 0;
> >
> > if (dump_trace)
> > perf_event__fprintf_mmap2(event, stdout);
> >
> > + if (event->header.misc & PERF_RECORD_MISC_MMAP_BUILD_ID) {
> > + bid = &__bid;
> > + build_id__init(bid, event->mmap2.build_id, event->mmap2.build_id_size);
> > + }
> > +
> > if (sample->cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
> > sample->cpumode == PERF_RECORD_MISC_KERNEL) {
> > struct extra_kernel_map xm = {
> > @@ -1732,7 +1746,7 @@ int machine__process_mmap2_event(struct machine *machine,
> > };
> >
> > strlcpy(xm.name, event->mmap2.filename, KMAP_NAME_LEN);
> > - ret = machine__process_kernel_mmap_event(machine, &xm);
> > + ret = machine__process_kernel_mmap_event(machine, &xm, bid);
> > if (ret < 0)
> > goto out_problem;
> > return 0;
> > @@ -1746,7 +1760,7 @@ int machine__process_mmap2_event(struct machine *machine,
> > map = map__new(machine, event->mmap2.start,
> > event->mmap2.len, event->mmap2.pgoff,
> > &dso_id, event->mmap2.prot,
> > - event->mmap2.flags,
> > + event->mmap2.flags, bid,
> > event->mmap2.filename, thread);
> >
> > if (map == NULL)
> > @@ -1789,7 +1803,7 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
> > };
> >
> > strlcpy(xm.name, event->mmap.filename, KMAP_NAME_LEN);
> > - ret = machine__process_kernel_mmap_event(machine, &xm);
> > + ret = machine__process_kernel_mmap_event(machine, &xm, NULL);
> > if (ret < 0)
> > goto out_problem;
> > return 0;
> > @@ -1805,7 +1819,7 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
> >
> > map = map__new(machine, event->mmap.start,
> > event->mmap.len, event->mmap.pgoff,
> > - NULL, prot, 0, event->mmap.filename, thread);
> > + NULL, prot, 0, NULL, event->mmap.filename, thread);
> >
> > if (map == NULL)
> > goto out_problem_map;
> > diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
> > index f44ede437dc7..692e56dc832e 100644
> > --- a/tools/perf/util/map.c
> > +++ b/tools/perf/util/map.c
> > @@ -130,8 +130,8 @@ void map__init(struct map *map, u64 start, u64 end, u64 pgoff, struct dso *dso)
> >
> > struct map *map__new(struct machine *machine, u64 start, u64 len,
> > u64 pgoff, struct dso_id *id,
> > - u32 prot, u32 flags, char *filename,
> > - struct thread *thread)
> > + u32 prot, u32 flags, struct build_id *bid,
> > + char *filename, struct thread *thread)
> > {
> > struct map *map = malloc(sizeof(*map));
> > struct nsinfo *nsi = NULL;
> > @@ -194,6 +194,10 @@ struct map *map__new(struct machine *machine, u64 start, u64 len,
> > dso__set_loaded(dso);
> > }
> > dso->nsinfo = nsi;
> > +
> > + if (build_id__is_defined(bid))
> > + dso__set_build_id(dso, bid);
> > +
> > dso__put(dso);
> > }
> > return map;
> > diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
> > index b1c0686db1b7..9f32825c98d8 100644
> > --- a/tools/perf/util/map.h
> > +++ b/tools/perf/util/map.h
> > @@ -104,10 +104,11 @@ void map__init(struct map *map,
> > u64 start, u64 end, u64 pgoff, struct dso *dso);
> >
> > struct dso_id;
> > +struct build_id;
> >
> > struct map *map__new(struct machine *machine, u64 start, u64 len,
> > u64 pgoff, struct dso_id *id, u32 prot, u32 flags,
> > - char *filename, struct thread *thread);
> > + struct build_id *bid, char *filename, struct thread *thread);
> > struct map *map__new2(u64 start, struct dso *dso);
> > void map__delete(struct map *map);
> > struct map *map__clone(struct map *map);
> > --
> > 2.26.2
> >
>
> --
>
> - Arnaldo
>

Next message: Lu Baolu: "Re: [PATCH 1/1] vfio/type1: Add subdev_ioasid callback to vfio_iommu_driver_ops"
Previous message: Peter Zijlstra: "Re: [PATCH v2 04/17] perf: x86/ds: Handle guest PEBS overflow PMI and inject it to guest"
In reply to: Arnaldo Carvalho de Melo: "Re: [PATCH 12/24] perf tools: Store build id from mmap2 events"
Next in thread: Jiri Olsa: "[PATCH 15/24] perf tools: Synthesize build id for kernel/modules/tasks"
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