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Date: Tue, 17 Nov 2020 09:38:05 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Jiri Olsa <jolsa@...nel.org>
Cc: lkml <linux-kernel@...r.kernel.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Ingo Molnar <mingo@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Namhyung Kim <namhyung@...nel.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Michael Petlan <mpetlan@...hat.com>,
Song Liu <songliubraving@...com>,
Ian Rogers <irogers@...gle.com>,
Stephane Eranian <eranian@...gle.com>,
Alexey Budankov <alexey.budankov@...ux.intel.com>,
Andi Kleen <ak@...ux.intel.com>,
Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 12/24] perf tools: Store build id from mmap2 events
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@...nel.org>
> ---
> 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? :-)
- 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
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