Allow enabling perf PMU counters by raw ID in addition to the generic list already provided. The format for kernel tracing is "perf:cpu:raw:rNNN:<name>" and "perf:thread:raw:rNNN:<name> for user-space. The rNNN format is the same as perf-record(1) where NNN is a hexadecimal event descriptor in the form of umask+eventsel. The <name> field allows the user to give a more friendly name.
Example usage on Intel i7-3520M to get the unhalted reference cycles (eventsel: 0x13c) count at privilege level 0 (umask: 0x00): lttng add-context -k -t perf:cpu:raw:r0013c:x86unhalted Result in the trace: sched_switch: { cpu_id = 3 }, { perf_cpu_raw_r0013c_x86unhalted = 27632578 }, [...] Signed-off-by: Julien Desfossez <jdesfos...@efficios.com> --- doc/man/lttng-add-context.1.txt | 7 +++ include/lttng/event.h | 2 + src/bin/lttng-sessiond/context.c | 1 + src/bin/lttng-sessiond/trace-ust.c | 1 + src/bin/lttng/commands/add_context.c | 94 +++++++++++++++++++++++++++++++++++- 5 files changed, 104 insertions(+), 1 deletion(-) diff --git a/doc/man/lttng-add-context.1.txt b/doc/man/lttng-add-context.1.txt index f995a7f..4779672 100644 --- a/doc/man/lttng-add-context.1.txt +++ b/doc/man/lttng-add-context.1.txt @@ -45,6 +45,13 @@ per-thread (`perf:thread:` prefix) counters. Currently, per-CPU counters can only be used in the Linux kernel tracing domain, while per-thread counters can only be used in the user space tracing domain. +It is also possible to enable PMU counters by raw ID using the +`perf:cpu:raw:rNNN:<name>` or `perf:thread:raw:rNNN:<name>` format for the +kernel and user-space respectively. `NNN` is a hexadecimal event descriptor +(umask+eventsel) just like with perf-record(1), the possible values for this +field are processor-specific. The `<name>` field is used to give a symbolic +name to the counter in the trace. + Application-specific context fields can be added to a channel using the following syntax: diff --git a/include/lttng/event.h b/include/lttng/event.h index 16b4d4f..398f94c 100644 --- a/include/lttng/event.h +++ b/include/lttng/event.h @@ -142,6 +142,8 @@ enum lttng_event_context_type { LTTNG_EVENT_CONTEXT_PREEMPTIBLE = 17, LTTNG_EVENT_CONTEXT_NEED_RESCHEDULE = 18, LTTNG_EVENT_CONTEXT_MIGRATABLE = 19, + LTTNG_EVENT_CONTEXT_PERF_CPU_RAW = 20, + LTTNG_EVENT_CONTEXT_PERF_THREAD_RAW = 21, }; enum lttng_event_field_type { diff --git a/src/bin/lttng-sessiond/context.c b/src/bin/lttng-sessiond/context.c index 9c3a394..81089b1 100644 --- a/src/bin/lttng-sessiond/context.c +++ b/src/bin/lttng-sessiond/context.c @@ -227,6 +227,7 @@ int context_kernel_add(struct ltt_kernel_session *ksession, break; case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER: case LTTNG_EVENT_CONTEXT_PERF_COUNTER: + case LTTNG_EVENT_CONTEXT_PERF_CPU_RAW: kctx->ctx.ctx = LTTNG_KERNEL_CONTEXT_PERF_CPU_COUNTER; break; case LTTNG_EVENT_CONTEXT_INTERRUPTIBLE: diff --git a/src/bin/lttng-sessiond/trace-ust.c b/src/bin/lttng-sessiond/trace-ust.c index 1c325fb..b75d11b 100644 --- a/src/bin/lttng-sessiond/trace-ust.c +++ b/src/bin/lttng-sessiond/trace-ust.c @@ -541,6 +541,7 @@ int trace_ust_context_type_event_to_ust( utype = LTTNG_UST_CONTEXT_IP; break; case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER: + case LTTNG_EVENT_CONTEXT_PERF_THREAD_RAW: if (!ustctl_has_perf_counters()) { utype = -1; WARN("Perf counters not implemented in UST"); diff --git a/src/bin/lttng/commands/add_context.c b/src/bin/lttng/commands/add_context.c index 2f43dc7..4db9bd2 100644 --- a/src/bin/lttng/commands/add_context.c +++ b/src/bin/lttng/commands/add_context.c @@ -78,6 +78,8 @@ enum context_type { CONTEXT_PREEMPTIBLE = 17, CONTEXT_NEED_RESCHEDULE = 18, CONTEXT_MIGRATABLE = 19, + CONTEXT_PERF_CPU_RAW = 20, + CONTEXT_PERF_THREAD_RAW = 21, }; /* @@ -87,6 +89,7 @@ enum perf_type { PERF_TYPE_HARDWARE = 0, PERF_TYPE_SOFTWARE = 1, PERF_TYPE_HW_CACHE = 3, + PERF_TYPE_RAW = 4, }; enum perf_count_hard { @@ -564,6 +567,8 @@ static int add_context(char *session_name) case LTTNG_EVENT_CONTEXT_PERF_COUNTER: case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER: case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER: + case LTTNG_EVENT_CONTEXT_PERF_CPU_RAW: + case LTTNG_EVENT_CONTEXT_PERF_THREAD_RAW: context.u.perf_counter.type = type->opt->u.perf.type; context.u.perf_counter.config = type->opt->u.perf.config; strncpy(context.u.perf_counter.name, type->opt->symbol, @@ -688,9 +693,88 @@ end: } static +int find_ctx_type_perf_raw(const char *ctx, struct ctx_type *type) +{ + char *next; + int ret; + int field_pos = 0; + char *tmp_list; + + tmp_list = strdup(ctx); + if (!tmp_list) { + PERROR("strdup temp list"); + ret = -ENOMEM; + goto error; + } + + /* Looking for "perf:[cpu|thread]:raw:<mask>:<name>". */ + for (;;) { + next = strtok(tmp_list, ":"); + if (!next) { + break; + } + tmp_list = NULL; + switch (field_pos) { + case 0: + if (strncmp(next, "perf", 4) != 0) { + ret = -1; + goto end; + } + break; + case 1: + if (strncmp(next, "cpu", 3) == 0) { + type->opt->ctx_type = CONTEXT_PERF_CPU_RAW; + } else if (strncmp(next, "thread", 4) == 0) { + type->opt->ctx_type = CONTEXT_PERF_THREAD_RAW; + } else { + ret = -1; + goto end; + } + break; + case 2: + if (strncmp(next, "raw", 3) != 0) { + ret = -1; + goto end; + } + break; + case 3: + if (strlen(next) < 2 || next[0] != 'r') { + ERR("Wrong perf raw mask format: rNNN"); + ret = -1; + goto end; + } + type->opt->u.perf.config = strtoll(next + 1, NULL, 16); + break; + case 4: + /* name */ + break; + case 5: + ERR("Too many ':' in perf raw format"); + ret = -1; + goto end; + }; + field_pos++; + } + + if (field_pos < 5) { + ERR("Wrong perf raw format"); + ret = -1; + goto end; + } + + ret = 0; + goto end; + +end: + free(tmp_list); +error: + return ret; +} + +static struct ctx_type *get_context_type(const char *ctx) { - int opt_index; + int opt_index, ret; struct ctx_type *type = NULL; const char app_ctx_prefix[] = "$app."; char *provider_name = NULL, *ctx_name = NULL; @@ -713,6 +797,14 @@ struct ctx_type *get_context_type(const char *ctx) goto found; } + /* Check if ctx is a raw perf context. */ + ret = find_ctx_type_perf_raw(ctx, type); + if (ret == 0) { + type->opt->u.perf.type = PERF_TYPE_RAW; + type->opt->symbol = strdup(ctx); + goto found; + } + /* * No match found against static contexts; check if it is an app * context. -- 1.9.1 _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev