From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965770AbbJVSPn (ORCPT ); Thu, 22 Oct 2015 14:15:43 -0400 Received: from mga09.intel.com ([134.134.136.24]:54228 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965724AbbJVSPj (ORCPT ); Thu, 22 Oct 2015 14:15:39 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,183,1444719600"; d="scan'208";a="817203643" From: Tom Zanussi To: rostedt@goodmis.org Cc: daniel.wagner@bmw-carit.de, masami.hiramatsu.pt@hitachi.com, namhyung@kernel.org, josh@joshtriplett.org, andi@firstfloor.org, mathieu.desnoyers@efficios.com, peterz@infradead.org, linux-kernel@vger.kernel.org, Tom Zanussi Subject: [PATCH v11 20/28] tracing: Support string type key properly Date: Thu, 22 Oct 2015 13:14:24 -0500 Message-Id: <7299df7808c6d761f7242b3c39fabda909a9dc80.1445530672.git.tom.zanussi@linux.intel.com> 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 From: Namhyung Kim The string in a trace event is usually recorded as dynamic array which is variable length. But current hist code only support fixed length array so it cannot support most strings. This patch fixes it by checking filter_type of the field and get proper pointer with it. With this, it can get a histogram of exec() based on filenames like below: # cd /sys/kernel/tracing/events/sched/sched_process_exec # cat 'hist:key=filename' > trigger # ps PID TTY TIME CMD 1 ? 00:00:00 init 29 ? 00:00:00 sh 38 ? 00:00:00 ps # ls enable filter format hist id trigger # cat hist # trigger info: hist:keys=filename:vals=hitcount:sort=hitcount:size=2048 [active] { filename: /usr/bin/ps } hitcount: 1 { filename: /usr/bin/ls } hitcount: 1 { filename: /usr/bin/cat } hitcount: 1 Totals: Hits: 3 Entries: 3 Dropped: 0 Cc: Tom Zanussi Cc: Masami Hiramatsu Signed-off-by: Namhyung Kim Tested-by: Masami Hiramatsu --- kernel/trace/trace_events_hist.c | 47 +++++++++++++++++++++++++++++++++++++--- 1 file changed, 44 insertions(+), 3 deletions(-) diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index 81e6065..955bf2b 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -52,6 +52,22 @@ static u64 hist_field_string(struct hist_field *hist_field, void *event) return (u64)(unsigned long)addr; } +static u64 hist_field_dynstring(struct hist_field *hist_field, void *event) +{ + u32 str_item = *(u32 *)(event + hist_field->field->offset); + int str_loc = str_item & 0xffff; + char *addr = (char *)(event + str_loc); + + return (u64)addr; +} + +static u64 hist_field_pstring(struct hist_field *hist_field, void *event) +{ + char **addr = (char **)(event + hist_field->field->offset); + + return (u64)*addr; +} + #define DEFINE_HIST_FIELD_FN(type) \ static u64 hist_field_##type(struct hist_field *hist_field, void *event)\ { \ @@ -331,7 +347,13 @@ static struct hist_field *create_hist_field(struct ftrace_event_field *field, if (is_string_field(field)) { flags |= HIST_FIELD_STRING; - hist_field->fn = hist_field_string; + + if (field->filter_type == FILTER_STATIC_STRING) + hist_field->fn = hist_field_string; + else if (field->filter_type == FILTER_DYN_STRING) + hist_field->fn = hist_field_dynstring; + else + hist_field->fn = hist_field_pstring; } else { hist_field->fn = select_value_fn(field->size, field->is_signed); @@ -486,7 +508,10 @@ static int create_key_field(struct hist_trigger_data *hist_data, goto out; } - key_size = field->size; + if (is_string_field(field)) /* should be last key field */ + key_size = HIST_KEY_SIZE_MAX - key_offset; + else + key_size = field->size; } hist_data->fields[key_idx] = create_hist_field(field, flags); @@ -797,8 +822,24 @@ static void event_hist_trigger(struct event_trigger_data *data, void *rec) key = (void *)&field_contents; if (hist_data->n_keys > 1) { + /* ensure NULL-termination */ + size_t size = key_field->size - 1; + + if (key_field->flags & HIST_FIELD_STRING) { + struct ftrace_event_field *field; + + field = key_field->field; + if (field->filter_type == FILTER_DYN_STRING) + size = *(u32 *)(rec + field->offset) >> 16; + else if (field->filter_type == FILTER_PTR_STRING) + size = strlen(key); + + if (size > key_field->size - 1) + size = key_field->size - 1; + } + memcpy(compound_key + key_field->offset, key, - key_field->size); + size); } } } -- 1.9.3