Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752668AbdIVUCS (ORCPT ); Fri, 22 Sep 2017 16:02:18 -0400 Received: from mga14.intel.com ([192.55.52.115]:4916 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752657AbdIVUCP (ORCPT ); Fri, 22 Sep 2017 16:02:15 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.42,427,1500966000"; d="scan'208";a="154474948" From: Tom Zanussi To: rostedt@goodmis.org Cc: tglx@linutronix.de, mhiramat@kernel.org, namhyung@kernel.org, vedang.patel@intel.com, bigeasy@linutronix.de, joel.opensrc@gmail.com, joelaf@google.com, mathieu.desnoyers@efficios.com, baohong.liu@intel.com, rajvi.jingar@intel.com, linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org, Tom Zanussi Subject: [PATCH v3 11/33] tracing: Add usecs modifier for hist trigger timestamps Date: Fri, 22 Sep 2017 14:59:51 -0500 Message-Id: X-Mailer: git-send-email 1.9.3 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4178 Lines: 133 Appending .usecs onto a common_timestamp field will cause the timestamp value to be in microseconds instead of the default nanoseconds. A typical latency histogram using usecs would look like this: # echo 'hist:keys=pid,prio:ts0=$common_timestamp.usecs ... # echo 'hist:keys=next_pid:wakeup_lat=$common_timestamp.usecs-$ts0 ... This also adds an external trace_clock_in_ns() to trace.c for the timestamp conversion. Signed-off-by: Tom Zanussi --- kernel/trace/trace.c | 8 ++++++++ kernel/trace/trace.h | 2 ++ kernel/trace/trace_events_hist.c | 28 ++++++++++++++++++++++------ 3 files changed, 32 insertions(+), 6 deletions(-) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 24af00a..19ffbe1 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -1170,6 +1170,14 @@ unsigned long nsecs_to_usecs(unsigned long nsecs) ARCH_TRACE_CLOCKS }; +bool trace_clock_in_ns(struct trace_array *tr) +{ + if (trace_clocks[tr->clock_id].in_ns) + return true; + + return false; +} + /* * trace_parser_get_init - gets the buffer for trace parser */ diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 2fed4ed..02bfd5c 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -288,6 +288,8 @@ enum { extern int tracing_set_time_stamp_abs(struct trace_array *tr, bool abs); +extern bool trace_clock_in_ns(struct trace_array *tr); + /* * The global tracer (top) should be the first trace array added, * but we check the flag anyway. diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index c2199df..c2abe41 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -90,12 +90,6 @@ static u64 hist_field_log2(struct hist_field *hist_field, void *event, return (u64) ilog2(roundup_pow_of_two(val)); } -static u64 hist_field_timestamp(struct hist_field *hist_field, void *event, - struct ring_buffer_event *rbe) -{ - return ring_buffer_event_time_stamp(rbe); -} - #define DEFINE_HIST_FIELD_FN(type) \ static u64 hist_field_##type(struct hist_field *hist_field, \ void *event, \ @@ -143,6 +137,7 @@ enum hist_field_flags { HIST_FIELD_FL_STACKTRACE = 1 << 8, HIST_FIELD_FL_LOG2 = 1 << 9, HIST_FIELD_FL_TIMESTAMP = 1 << 10, + HIST_FIELD_FL_TIMESTAMP_USECS = 1 << 11, }; struct hist_trigger_attrs { @@ -153,6 +148,7 @@ struct hist_trigger_attrs { bool pause; bool cont; bool clear; + bool ts_in_usecs; unsigned int map_bits; }; @@ -170,6 +166,20 @@ struct hist_trigger_data { bool enable_timestamps; }; +static u64 hist_field_timestamp(struct hist_field *hist_field, void *event, + struct ring_buffer_event *rbe) +{ + struct hist_trigger_data *hist_data = hist_field->hist_data; + struct trace_array *tr = hist_data->event_file->tr; + + u64 ts = ring_buffer_event_time_stamp(rbe); + + if (hist_data->attrs->ts_in_usecs && trace_clock_in_ns(tr)) + ts = ns2usecs(ts); + + return ts; +} + static const char *hist_field_name(struct hist_field *field, unsigned int level) { @@ -634,6 +644,8 @@ static int create_key_field(struct hist_trigger_data *hist_data, flags |= HIST_FIELD_FL_SYSCALL; else if (strcmp(field_str, "log2") == 0) flags |= HIST_FIELD_FL_LOG2; + else if (strcmp(field_str, "usecs") == 0) + flags |= HIST_FIELD_FL_TIMESTAMP_USECS; else { ret = -EINVAL; goto out; @@ -643,6 +655,8 @@ static int create_key_field(struct hist_trigger_data *hist_data, if (strcmp(field_name, "$common_timestamp") == 0) { flags |= HIST_FIELD_FL_TIMESTAMP; hist_data->enable_timestamps = true; + if (flags & HIST_FIELD_FL_TIMESTAMP_USECS) + hist_data->attrs->ts_in_usecs = true; key_size = sizeof(u64); } else { field = trace_find_event_field(file->event_call, field_name); @@ -1243,6 +1257,8 @@ static const char *get_hist_field_flags(struct hist_field *hist_field) flags_str = "syscall"; else if (hist_field->flags & HIST_FIELD_FL_LOG2) flags_str = "log2"; + else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS) + flags_str = "usecs"; return flags_str; } -- 1.9.3