From d762ba020d29ddb676805a90bf1450921817418f Mon Sep 17 00:00:00 2001 From: Ian Rogers Date: Mon, 9 Sep 2024 13:37:38 -0700 Subject: [PATCH] perf inject: Add new mmap2-buildid-all option Add an option that allows all mmap or mmap2 events to be rewritten as mmap2 events with build IDs. This is similar to the existing -b/--build-ids and --buildid-all options except instead of adding a build_id event an existing mmap/mmap2 event is used as a template and a new mmap2 event synthesized from it. As mmap2 events are typical this avoids the insertion of build_id events. Add test coverage to the pipe test. Signed-off-by: Ian Rogers Acked-by: Namhyung Kim Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Anne Macedo Cc: Casey Chen Cc: Colin Ian King Cc: Ingo Molnar Cc: Jiri Olsa Cc: Kan Liang Cc: Mark Rutland Cc: Peter Zijlstra Cc: Sun Haiyong Link: https://lore.kernel.org/r/20240909203740.143492-3-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-inject.c | 88 ++++++++++++++++++++++++++++- tools/perf/tests/shell/pipe_test.sh | 1 + tools/perf/util/synthetic-events.c | 57 +++++++++++++++++++ tools/perf/util/synthetic-events.h | 11 ++++ 4 files changed, 154 insertions(+), 3 deletions(-) diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c index 24470c57527d..5a27fa46e93d 100644 --- a/tools/perf/builtin-inject.c +++ b/tools/perf/builtin-inject.c @@ -107,6 +107,7 @@ enum build_id_rewrite_style { BID_RWS__NONE = 0, BID_RWS__INJECT_HEADER_LAZY, BID_RWS__INJECT_HEADER_ALL, + BID_RWS__MMAP2_BUILDID_ALL, }; struct perf_inject { @@ -146,6 +147,16 @@ static int tool__inject_build_id(const struct perf_tool *tool, __u16 misc, const char *filename, struct dso *dso, u32 flags); +static int tool__inject_mmap2_build_id(const struct perf_tool *tool, + struct perf_sample *sample, + struct machine *machine, + const struct evsel *evsel, + __u16 misc, + __u32 pid, __u32 tid, + __u64 start, __u64 len, __u64 pgoff, + struct dso *dso, + __u32 prot, __u32 flags, + const char *filename); static int output_bytes(struct perf_inject *inject, void *buf, size_t sz) { @@ -161,6 +172,7 @@ static int output_bytes(struct perf_inject *inject, void *buf, size_t sz) static int perf_event__repipe_synth(const struct perf_tool *tool, union perf_event *event) + { struct perf_inject *inject = container_of(tool, struct perf_inject, tool); @@ -454,7 +466,9 @@ static int perf_event__repipe_common_mmap(const struct perf_tool *tool, union perf_event *event, struct perf_sample *sample, struct machine *machine, - __u32 pid, __u32 tid, __u32 flags, + __u32 pid, __u32 tid, + __u64 start, __u64 len, __u64 pgoff, + __u32 flags, __u32 prot, const char *filename, const struct dso_id *dso_id, int (*perf_event_process)(const struct perf_tool *tool, @@ -525,6 +539,26 @@ static int perf_event__repipe_common_mmap(const struct perf_tool *tool, return err; } } + if ((inject->build_id_style == BID_RWS__MMAP2_BUILDID_ALL) && + !(event->header.misc & PERF_RECORD_MISC_MMAP_BUILD_ID)) { + struct evsel *evsel = evlist__event2evsel(inject->session->evlist, event); + + if (evsel && !dso_sought) { + dso = findnew_dso(pid, tid, filename, dso_id, machine); + dso_sought = true; + } + if (evsel && dso && + !tool__inject_mmap2_build_id(tool, sample, machine, evsel, + sample->cpumode | PERF_RECORD_MISC_MMAP_BUILD_ID, + pid, tid, start, len, pgoff, + dso, + prot, flags, + filename)) { + /* Injected mmap2 so no need to repipe. */ + dso__put(dso); + return 0; + } + } dso__put(dso); return perf_event__repipe(tool, event, sample, machine); } @@ -536,7 +570,9 @@ static int perf_event__repipe_mmap(const struct perf_tool *tool, { return perf_event__repipe_common_mmap( tool, event, sample, machine, - event->mmap.pid, event->mmap.tid, /*flags=*/0, + event->mmap.pid, event->mmap.tid, + event->mmap.start, event->mmap.len, event->mmap.pgoff, + /*flags=*/0, PROT_EXEC, event->mmap.filename, /*dso_id=*/NULL, perf_event__process_mmap); } @@ -559,7 +595,9 @@ static int perf_event__repipe_mmap2(const struct perf_tool *tool, return perf_event__repipe_common_mmap( tool, event, sample, machine, - event->mmap2.pid, event->mmap2.tid, event->mmap2.flags, + event->mmap2.pid, event->mmap2.tid, + event->mmap2.start, event->mmap2.len, event->mmap2.pgoff, + event->mmap2.flags, event->mmap2.prot, event->mmap2.filename, dso_id, perf_event__process_mmap2); } @@ -748,6 +786,45 @@ static int tool__inject_build_id(const struct perf_tool *tool, return 0; } +static int tool__inject_mmap2_build_id(const struct perf_tool *tool, + struct perf_sample *sample, + struct machine *machine, + const struct evsel *evsel, + __u16 misc, + __u32 pid, __u32 tid, + __u64 start, __u64 len, __u64 pgoff, + struct dso *dso, + __u32 prot, __u32 flags, + const char *filename) +{ + int err; + + /* Return to repipe anonymous maps. */ + if (is_anon_memory(filename) || flags & MAP_HUGETLB) + return 1; + if (is_no_dso_memory(filename)) + return 1; + + if (dso__read_build_id(dso)) { + pr_debug("no build_id found for %s\n", filename); + return -1; + } + + err = perf_event__synthesize_mmap2_build_id(tool, sample, machine, + perf_event__repipe, + evsel, + misc, pid, tid, + start, len, pgoff, + dso__bid(dso), + prot, flags, + filename); + if (err) { + pr_err("Can't synthesize build_id event for %s\n", filename); + return -1; + } + return 0; +} + static int mark_dso_hit(const struct perf_tool *tool, struct perf_sample *sample, struct machine *machine, @@ -2261,12 +2338,15 @@ int cmd_inject(int argc, const char **argv) const char *known_build_ids = NULL; bool build_ids; bool build_id_all; + bool mmap2_build_id_all; struct option options[] = { OPT_BOOLEAN('b', "build-ids", &build_ids, "Inject build-ids into the output stream"), OPT_BOOLEAN(0, "buildid-all", &build_id_all, "Inject build-ids of all DSOs into the output stream"), + OPT_BOOLEAN(0, "mmap2-buildid-all", &mmap2_build_id_all, + "Rewrite all mmap events as mmap2 events with build IDs"), OPT_STRING(0, "known-build-ids", &known_build_ids, "buildid path [,buildid path...]", "build-ids to use for given paths"), @@ -2363,6 +2443,8 @@ int cmd_inject(int argc, const char **argv) return -1; } } + if (mmap2_build_id_all) + inject.build_id_style = BID_RWS__MMAP2_BUILDID_ALL; if (build_ids) inject.build_id_style = BID_RWS__INJECT_HEADER_LAZY; if (build_id_all) diff --git a/tools/perf/tests/shell/pipe_test.sh b/tools/perf/tests/shell/pipe_test.sh index a3c94b4182c2..250574cd68b6 100755 --- a/tools/perf/tests/shell/pipe_test.sh +++ b/tools/perf/tests/shell/pipe_test.sh @@ -118,6 +118,7 @@ test_inject_bids() { test_record_report test_inject_bids -b test_inject_bids --buildid-all +test_inject_bids --mmap2-buildid-all cleanup exit $err diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c index 6bb62e4e2d5d..a58444c4aed1 100644 --- a/tools/perf/util/synthetic-events.c +++ b/tools/perf/util/synthetic-events.c @@ -2266,6 +2266,63 @@ int perf_event__synthesize_build_id(const struct perf_tool *tool, ev.header.size += ret; } + + return process(tool, &ev, sample, machine); +} + +int perf_event__synthesize_mmap2_build_id(const struct perf_tool *tool, + struct perf_sample *sample, + struct machine *machine, + perf_event__handler_t process, + const struct evsel *evsel, + __u16 misc, + __u32 pid, __u32 tid, + __u64 start, __u64 len, __u64 pgoff, + const struct build_id *bid, + __u32 prot, __u32 flags, + const char *filename) +{ + union perf_event ev; + size_t ev_len; + void *array; + int ret; + + ev_len = sizeof(ev.mmap2) - sizeof(ev.mmap2.filename) + strlen(filename) + 1; + ev_len = PERF_ALIGN(ev_len, sizeof(u64)); + + memset(&ev, 0, ev_len); + + ev.mmap2.header.type = PERF_RECORD_MMAP2; + ev.mmap2.header.misc = misc | PERF_RECORD_MISC_MMAP_BUILD_ID; + ev.mmap2.header.size = ev_len; + + ev.mmap2.pid = pid; + ev.mmap2.tid = tid; + ev.mmap2.start = start; + ev.mmap2.len = len; + ev.mmap2.pgoff = pgoff; + + ev.mmap2.build_id_size = min(bid->size, sizeof(ev.mmap2.build_id)); + memcpy(ev.mmap2.build_id, bid->data, ev.mmap2.build_id_size); + + ev.mmap2.prot = prot; + ev.mmap2.flags = flags; + + memcpy(ev.mmap2.filename, filename, min(strlen(filename), sizeof(ev.mmap.filename))); + + array = &ev; + array += ev.header.size; + ret = perf_event__synthesize_id_sample(array, evsel->core.attr.sample_type, sample); + if (ret < 0) + return ret; + + if (ret & 7) { + pr_err("Bad id sample size %d\n", ret); + return -EINVAL; + } + + ev.header.size += ret; + return process(tool, &ev, sample, machine); } diff --git a/tools/perf/util/synthetic-events.h b/tools/perf/util/synthetic-events.h index 795bf3e18396..b9c936b5cfeb 100644 --- a/tools/perf/util/synthetic-events.h +++ b/tools/perf/util/synthetic-events.h @@ -54,6 +54,17 @@ int perf_event__synthesize_build_id(const struct perf_tool *tool, __u16 misc, const struct build_id *bid, const char *filename); +int perf_event__synthesize_mmap2_build_id(const struct perf_tool *tool, + struct perf_sample *sample, + struct machine *machine, + perf_event__handler_t process, + const struct evsel *evsel, + __u16 misc, + __u32 pid, __u32 tid, + __u64 start, __u64 len, __u64 pgoff, + const struct build_id *bid, + __u32 prot, __u32 flags, + const char *filename); int perf_event__synthesize_cpu_map(const struct perf_tool *tool, const struct perf_cpu_map *cpus, perf_event__handler_t process, struct machine *machine); int perf_event__synthesize_event_update_cpus(const struct perf_tool *tool, struct evsel *evsel, perf_event__handler_t process); int perf_event__synthesize_event_update_name(const struct perf_tool *tool, struct evsel *evsel, perf_event__handler_t process);