From patchwork Sun Oct 28 19:02:28 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sasha Levin X-Patchwork-Id: 194731 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id B961A2C0095 for ; Mon, 29 Oct 2012 06:04:42 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754990Ab2J1TEV (ORCPT ); Sun, 28 Oct 2012 15:04:21 -0400 Received: from mail-qa0-f46.google.com ([209.85.216.46]:46599 "EHLO mail-qa0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755142Ab2J1TEE (ORCPT ); Sun, 28 Oct 2012 15:04:04 -0400 Received: by mail-qa0-f46.google.com with SMTP id c26so1106351qad.19 for ; Sun, 28 Oct 2012 12:04:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; bh=RiiyliFzuX3dG7DBD5dIepZ/mzgPTiSc4XhKKite81s=; b=QxYNikj/wnp46oBQ+l5hUCfTKadW4dTzvI+Lv+wWmX2OfFEQY1YqO0McQpvFl847ht 1OhTQzhBsjMgradrZRmmP7zEWn4gdU7nPJZ4zFlwRqJ1GG7osdfyV/7POf9pRGRCM8MC Sr1vR4BhXShUZiOFVU2k1adiksLoDSR5rBXCzgm3FhZvwZTh0gQFyCq5aA9s7q/3YRxN LLNFE3ZYWOTUVoju51M+p4CSX6dxqaP27OUm6Kd1ulJWREgdZ1TDl0eSU8Sh3KcokqUF LtyNPJnaWveH4/LLa6/dnFTTh45jHFjuZM8qoaXzl6JOBbj2AFHXe9dWVJVpgSBpQeox twyQ== Received: by 10.49.133.97 with SMTP id pb1mr20137994qeb.31.1351451043442; Sun, 28 Oct 2012 12:04:03 -0700 (PDT) Received: from localhost.localdomain ([50.145.168.211]) by mx.google.com with ESMTPS id j3sm3921747qek.7.2012.10.28.12.04.00 (version=TLSv1/SSLv3 cipher=OTHER); Sun, 28 Oct 2012 12:04:02 -0700 (PDT) From: Sasha Levin To: torvalds@linux-foundation.org Cc: tj@kernel.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, paul.gortmaker@windriver.com, davem@davemloft.net, rostedt@goodmis.org, mingo@elte.hu, ebiederm@xmission.com, aarcange@redhat.com, ericvh@gmail.com, netdev@vger.kernel.org, josh@joshtriplett.org, eric.dumazet@gmail.com, mathieu.desnoyers@efficios.com, axboe@kernel.dk, agk@redhat.com, dm-devel@redhat.com, neilb@suse.de, ccaulfie@redhat.com, teigland@redhat.com, Trond.Myklebust@netapp.com, bfields@fieldses.org, fweisbec@gmail.com, jesse@nicira.com, venkat.x.venkatsubra@oracle.com, ejt@redhat.com, snitzer@redhat.com, edumazet@google.com, linux-nfs@vger.kernel.org, dev@openvswitch.org, rds-devel@oss.oracle.com, lw@cn.fujitsu.com, Sasha Levin Subject: [PATCH v7 16/16] tracing output: use new hashtable implementation Date: Sun, 28 Oct 2012 15:02:28 -0400 Message-Id: <1351450948-15618-16-git-send-email-levinsasha928@gmail.com> X-Mailer: git-send-email 1.7.12.4 In-Reply-To: <1351450948-15618-1-git-send-email-levinsasha928@gmail.com> References: <1351450948-15618-1-git-send-email-levinsasha928@gmail.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Switch tracing to use the new hashtable implementation. This reduces the amount of generic unrelated code in the tracing module. Signed-off-by: Sasha Levin --- kernel/trace/trace_output.c | 20 ++++++++------------ 1 file changed, 8 insertions(+), 12 deletions(-) diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c index 123b189..1324c1a 100644 --- a/kernel/trace/trace_output.c +++ b/kernel/trace/trace_output.c @@ -8,15 +8,15 @@ #include #include #include +#include #include "trace_output.h" -/* must be a power of 2 */ -#define EVENT_HASHSIZE 128 +#define EVENT_HASH_BITS 7 DECLARE_RWSEM(trace_event_mutex); -static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly; +static DEFINE_HASHTABLE(event_hash, EVENT_HASH_BITS); static int next_event_type = __TRACE_LAST_TYPE + 1; @@ -712,11 +712,8 @@ struct trace_event *ftrace_find_event(int type) { struct trace_event *event; struct hlist_node *n; - unsigned key; - key = type & (EVENT_HASHSIZE - 1); - - hlist_for_each_entry(event, n, &event_hash[key], node) { + hash_for_each_possible(event_hash, event, n, node, type) { if (event->type == type) return event; } @@ -781,7 +778,6 @@ void trace_event_read_unlock(void) */ int register_ftrace_event(struct trace_event *event) { - unsigned key; int ret = 0; down_write(&trace_event_mutex); @@ -833,9 +829,7 @@ int register_ftrace_event(struct trace_event *event) if (event->funcs->binary == NULL) event->funcs->binary = trace_nop_print; - key = event->type & (EVENT_HASHSIZE - 1); - - hlist_add_head(&event->node, &event_hash[key]); + hash_add(event_hash, &event->node, event->type); ret = event->type; out: @@ -850,7 +844,7 @@ EXPORT_SYMBOL_GPL(register_ftrace_event); */ int __unregister_ftrace_event(struct trace_event *event) { - hlist_del(&event->node); + hash_del(&event->node); list_del(&event->list); return 0; } @@ -1323,6 +1317,8 @@ __init static int init_events(void) } } + hash_init(event_hash); + return 0; } early_initcall(init_events);