Messages in this thread Patch in this message | | | From | Tan Xiaojun <> | Subject | [RFC v2 4/4] perf tools: Support "branch-misses:pp" on arm64 | Date | Thu, 24 Oct 2019 22:48:30 +0800 |
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At the suggestion of James Clark, use spe to support the precise ip of some events. Currently its support event is: branch-misses.
Example usage:
$ ./perf record -e branch-misses:pp dd if=/dev/zero of=/dev/null count=10000 (:p/pp/ppp is same for this case.)
$ ./perf report --stdio ("--stdio is not necessary")
-------------------------------------------------------------------- ... # Samples: 14 of event 'branch-misses:pp' # Event count (approx.): 14 # # Children Self Command Shared Object Symbol # ........ ........ ....... ................. .......................... # 14.29% 14.29% dd [kernel.kallsyms] [k] __arch_copy_from_user 14.29% 14.29% dd libc-2.28.so [.] _dl_addr 7.14% 7.14% dd [kernel.kallsyms] [k] __free_pages 7.14% 7.14% dd [kernel.kallsyms] [k] __pi_memcpy 7.14% 7.14% dd [kernel.kallsyms] [k] pagecache_get_page 7.14% 7.14% dd [kernel.kallsyms] [k] unmap_single_vma 7.14% 7.14% dd dd [.] 0x00000000000025ec 7.14% 7.14% dd ld-2.28.so [.] _dl_lookup_symbol_x 7.14% 7.14% dd ld-2.28.so [.] check_match 7.14% 7.14% dd libc-2.28.so [.] __mpn_rshift 7.14% 7.14% dd libc-2.28.so [.] _nl_intern_locale_data 7.14% 7.14% dd libc-2.28.so [.] read_alias_file ... --------------------------------------------------------------------
Signed-off-by: Tan Xiaojun <tanxiaojun@huawei.com> --- tools/perf/util/arm-spe.c | 44 +++++++++++++++++++++++++++++++++++++++ tools/perf/util/arm-spe.h | 3 +++ tools/perf/util/evlist.c | 2 ++ 3 files changed, 49 insertions(+)
diff --git a/tools/perf/util/arm-spe.c b/tools/perf/util/arm-spe.c index 596a48df6f4e..9851d1ed6d75 100644 --- a/tools/perf/util/arm-spe.c +++ b/tools/perf/util/arm-spe.c @@ -35,6 +35,19 @@ #define MAX_TIMESTAMP (~0ULL) +#define SPE_ATTR_TS_ENABLE BIT(0) +#define SPE_ATTR_PA_ENABLE BIT(1) +#define SPE_ATTR_PCT_ENABLE BIT(2) +#define SPE_ATTR_JITTER BIT(16) +#define SPE_ATTR_BRANCH_FILTER BIT(32) +#define SPE_ATTR_LOAD_FILTER BIT(33) +#define SPE_ATTR_STORE_FILTER BIT(34) + +#define SPE_ATTR_EV_RETIRED BIT(1) +#define SPE_ATTR_EV_CACHE BIT(3) +#define SPE_ATTR_EV_TLB BIT(5) +#define SPE_ATTR_EV_BRANCH BIT(7) + struct arm_spe { struct auxtrace auxtrace; struct auxtrace_queues queues; @@ -771,6 +784,15 @@ arm_spe_synth_events(struct arm_spe *spe, struct perf_session *session) attr.sample_id_all = evsel->core.attr.sample_id_all; attr.read_format = evsel->core.attr.read_format; + /* If it is in the precise ip mode, there is no need to + * synthesize new events. */ + if (!strncmp(evsel->name, "branch-misses", 13)) { + spe->sample_branch_miss = true; + spe->branch_miss_id = evsel->core.id[0]; + + return 0; + } + /* create new id val to be a fixed offset from evsel id */ id = evsel->core.id[0] + 1000000000; @@ -880,3 +902,25 @@ int arm_spe_process_auxtrace_info(union perf_event *event, free(spe); return err; } + +void arm_spe_precise_ip_support(struct evlist *evlist, struct evsel *evsel) +{ + struct perf_pmu *pmu; + + /* Currently only supports precise_ip for branch-misses on arm64 */ + if (!strcmp(perf_env__arch(evlist->env), "arm64") + && evsel->core.attr.config == PERF_COUNT_HW_BRANCH_MISSES + && evsel->core.attr.precise_ip) { + pmu = perf_pmu__find("arm_spe_0"); + if (pmu) { + evsel->pmu_name = pmu->name; + evsel->core.attr.type = PERF_RECORD_AUXTRACE; + evsel->core.attr.config = SPE_ATTR_TS_ENABLE + | SPE_ATTR_PA_ENABLE + | SPE_ATTR_JITTER + | SPE_ATTR_BRANCH_FILTER; + evsel->core.attr.precise_ip = 0; + evsel->core.attr.config1 = SPE_ATTR_EV_BRANCH; + } + } +} diff --git a/tools/perf/util/arm-spe.h b/tools/perf/util/arm-spe.h index 98d3235781c3..8b1fb191d03a 100644 --- a/tools/perf/util/arm-spe.h +++ b/tools/perf/util/arm-spe.h @@ -20,6 +20,8 @@ enum { union perf_event; struct perf_session; struct perf_pmu; +struct evlist; +struct evsel; struct auxtrace_record *arm_spe_recording_init(int *err, struct perf_pmu *arm_spe_pmu); @@ -28,4 +30,5 @@ int arm_spe_process_auxtrace_info(union perf_event *event, struct perf_session *session); struct perf_event_attr *arm_spe_pmu_default_config(struct perf_pmu *arm_spe_pmu); +void arm_spe_precise_ip_support(struct evlist *evlist, struct evsel *evsel); #endif diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index d277a98e62df..8a83d2b98209 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -9,6 +9,7 @@ #include <errno.h> #include <inttypes.h> #include <poll.h> +#include "arm-spe.h" #include "cpumap.h" #include "util/mmap.h" #include "thread_map.h" @@ -181,6 +182,7 @@ void perf_evlist__splice_list_tail(struct evlist *evlist, struct evsel *evsel, *temp; __evlist__for_each_entry_safe(list, temp, evsel) { + arm_spe_precise_ip_support(evlist, evsel); list_del_init(&evsel->core.node); evlist__add(evlist, evsel); } -- 2.17.1
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