From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760724AbZBDWRN (ORCPT ); Wed, 4 Feb 2009 17:17:13 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755579AbZBDWQ5 (ORCPT ); Wed, 4 Feb 2009 17:16:57 -0500 Received: from mx2.redhat.com ([66.187.237.31]:35472 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752729AbZBDWQ5 (ORCPT ); Wed, 4 Feb 2009 17:16:57 -0500 Date: Wed, 4 Feb 2009 20:16:39 -0200 From: Arnaldo Carvalho de Melo To: Steven Rostedt Cc: Ingo Molnar , =?iso-8859-1?Q?Fr=E9d=E9ric?= Weisbecker , Jens Axboe , Linux Kernel Mailing List Subject: [PATCH tip 1/1] trace: assign defaults at register_ftrace_event Message-ID: <20090204221639.GO3440@ghostprotocols.net> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Impact: simplification of tracers As all tracers are doing this we might as well do it in register_ftrace_event and save one branch each time we call these callbacks. Cc: Ingo Molnar Cc: Frédéric Weisbecker Cc: Jens Axboe Signed-off-by: Arnaldo Carvalho de Melo --- block/blktrace.c | 2 -- kernel/trace/trace.c | 13 +++++-------- kernel/trace/trace_branch.c | 3 --- kernel/trace/trace_output.c | 13 +++++++++++-- 4 files changed, 16 insertions(+), 15 deletions(-) diff --git a/block/blktrace.c b/block/blktrace.c index c7698d1..1ebd068 100644 --- a/block/blktrace.c +++ b/block/blktrace.c @@ -1243,8 +1243,6 @@ static struct trace_event trace_blk_event = { .type = TRACE_BLK, .trace = blk_trace_event_print, .latency_trace = blk_trace_event_print, - .raw = trace_nop_print, - .hex = trace_nop_print, .binary = blk_trace_event_print_binary, }; diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index fd51cf0..a5e4c0a 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -1412,7 +1412,7 @@ static enum print_line_t print_lat_fmt(struct trace_iterator *iter) goto partial; } - if (event && event->latency_trace) + if (event) return event->latency_trace(iter, sym_flags); if (!trace_seq_printf(s, "Unknown type %d\n", entry->type)) @@ -1441,7 +1441,7 @@ static enum print_line_t print_trace_fmt(struct trace_iterator *iter) goto partial; } - if (event && event->trace) + if (event) return event->trace(iter, sym_flags); if (!trace_seq_printf(s, "Unknown type %d\n", entry->type)) @@ -1467,7 +1467,7 @@ static enum print_line_t print_raw_fmt(struct trace_iterator *iter) } event = ftrace_find_event(entry->type); - if (event && event->raw) + if (event) return event->raw(iter, 0); if (!trace_seq_printf(s, "%d ?\n", entry->type)) @@ -1494,7 +1494,7 @@ static enum print_line_t print_hex_fmt(struct trace_iterator *iter) } event = ftrace_find_event(entry->type); - if (event && event->hex) { + if (event) { enum print_line_t ret = event->hex(iter, 0); if (ret != TRACE_TYPE_HANDLED) return ret; @@ -1536,10 +1536,7 @@ static enum print_line_t print_bin_fmt(struct trace_iterator *iter) } event = ftrace_find_event(entry->type); - if (event && event->binary) - return event->binary(iter, 0); - - return TRACE_TYPE_HANDLED; + return event ? event->binary(iter, 0) : TRACE_TYPE_HANDLED; } static int trace_empty(struct trace_iterator *iter) diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c index 7ac72a4..297deb2 100644 --- a/kernel/trace/trace_branch.c +++ b/kernel/trace/trace_branch.c @@ -182,9 +182,6 @@ static struct trace_event trace_branch_event = { .type = TRACE_BRANCH, .trace = trace_branch_print, .latency_trace = trace_branch_print, - .raw = trace_nop_print, - .hex = trace_nop_print, - .binary = trace_nop_print, }; static struct tracer branch_trace __read_mostly = diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c index b7380ee..b6e99af 100644 --- a/kernel/trace/trace_output.c +++ b/kernel/trace/trace_output.c @@ -435,6 +435,17 @@ int register_ftrace_event(struct trace_event *event) if (ftrace_find_event(event->type)) goto out; + if (event->trace == NULL) + event->trace = trace_nop_print; + if (event->latency_trace == NULL) + event->latency_trace = trace_nop_print; + if (event->raw == NULL) + event->raw = trace_nop_print; + if (event->hex == NULL) + event->hex = trace_nop_print; + if (event->binary == NULL) + event->binary = trace_nop_print; + key = event->type & (EVENT_HASHSIZE - 1); hlist_add_head_rcu(&event->node, &event_hash[key]); @@ -874,8 +885,6 @@ static struct trace_event trace_print_event = { .trace = trace_print_print, .latency_trace = trace_print_print, .raw = trace_print_raw, - .hex = trace_nop_print, - .binary = trace_nop_print, }; static struct trace_event *events[] __initdata = { -- 1.6.0.6