From patchwork Sun Oct 28 19:02:18 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sasha Levin X-Patchwork-Id: 1658631 Return-Path: X-Original-To: patchwork-linux-nfs@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id 94164DFABE for ; Sun, 28 Oct 2012 19:08:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754663Ab2J1THo (ORCPT ); Sun, 28 Oct 2012 15:07:44 -0400 Received: from mail-qa0-f53.google.com ([209.85.216.53]:65273 "EHLO mail-qa0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754448Ab2J1TD0 (ORCPT ); Sun, 28 Oct 2012 15:03:26 -0400 Received: by mail-qa0-f53.google.com with SMTP id c1so1110476qae.19 for ; Sun, 28 Oct 2012 12:03:25 -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=tgzEiFUv77yqm/n3ooZh2vtZZ3q3xAWdVf+Y9D1lrzc=; b=KbNlyZs791/fHyMsXAjOy7JpDdK0GNYXAQhDyV8L48NGyq2ct6p9Wf1HTd+FaCiwMb doYr6AaGj5xWWQJ0U9jbGy9NWs6CEmygqXK5aRqW420ql2weT/sUmLxqPAy7TcMBqFgE 7P53xHdmTFFf4Je6glOxsE6w0dZV+PRkM4tEBkRaeCjQipc73GJ8xQebeoFCDWeN4Bto G/V/aynKjvhWTGKfE68xo79ifrzGgrlLLbaWNkkOx83/ixKOVbZL9dLjc10/RWVSVD33 MBiM9w5E+GzJa28Z1aajQ/2vX7OWbv/DPlEimY/26AhH9vQfbtWBEObeGL9NM9FzPv2s 4+sw== Received: by 10.49.72.1 with SMTP id z1mr20238122qeu.2.1351451005672; Sun, 28 Oct 2012 12:03:25 -0700 (PDT) Received: from localhost.localdomain ([50.145.168.211]) by mx.google.com with ESMTPS id j3sm3921747qek.7.2012.10.28.12.03.22 (version=TLSv1/SSLv3 cipher=OTHER); Sun, 28 Oct 2012 12:03:25 -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 06/16] tracepoint: use new hashtable implementation Date: Sun, 28 Oct 2012 15:02:18 -0400 Message-Id: <1351450948-15618-6-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: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org Switch tracepoints to use the new hashtable implementation. This reduces the amount of generic unrelated code in the tracepoints. Signed-off-by: Sasha Levin --- kernel/tracepoint.c | 27 +++++++++++---------------- 1 file changed, 11 insertions(+), 16 deletions(-) diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c index d96ba22..854df92 100644 --- a/kernel/tracepoint.c +++ b/kernel/tracepoint.c @@ -26,6 +26,7 @@ #include #include #include +#include extern struct tracepoint * const __start___tracepoints_ptrs[]; extern struct tracepoint * const __stop___tracepoints_ptrs[]; @@ -49,8 +50,7 @@ static LIST_HEAD(tracepoint_module_list); * Protected by tracepoints_mutex. */ #define TRACEPOINT_HASH_BITS 6 -#define TRACEPOINT_TABLE_SIZE (1 << TRACEPOINT_HASH_BITS) -static struct hlist_head tracepoint_table[TRACEPOINT_TABLE_SIZE]; +static DEFINE_HASHTABLE(tracepoint_table, TRACEPOINT_HASH_BITS); /* * Note about RCU : @@ -191,16 +191,15 @@ tracepoint_entry_remove_probe(struct tracepoint_entry *entry, */ static struct tracepoint_entry *get_tracepoint(const char *name) { - struct hlist_head *head; struct hlist_node *node; struct tracepoint_entry *e; u32 hash = jhash(name, strlen(name), 0); - head = &tracepoint_table[hash & (TRACEPOINT_TABLE_SIZE - 1)]; - hlist_for_each_entry(e, node, head, hlist) { + hash_for_each_possible(tracepoint_table, e, node, hlist, hash) { if (!strcmp(name, e->name)) return e; } + return NULL; } @@ -210,19 +209,13 @@ static struct tracepoint_entry *get_tracepoint(const char *name) */ static struct tracepoint_entry *add_tracepoint(const char *name) { - struct hlist_head *head; - struct hlist_node *node; struct tracepoint_entry *e; size_t name_len = strlen(name) + 1; u32 hash = jhash(name, name_len-1, 0); - head = &tracepoint_table[hash & (TRACEPOINT_TABLE_SIZE - 1)]; - hlist_for_each_entry(e, node, head, hlist) { - if (!strcmp(name, e->name)) { - printk(KERN_NOTICE - "tracepoint %s busy\n", name); - return ERR_PTR(-EEXIST); /* Already there */ - } + if (get_tracepoint(name)) { + printk(KERN_NOTICE "tracepoint %s busy\n", name); + return ERR_PTR(-EEXIST); /* Already there */ } /* * Using kmalloc here to allocate a variable length element. Could @@ -234,7 +227,7 @@ static struct tracepoint_entry *add_tracepoint(const char *name) memcpy(&e->name[0], name, name_len); e->funcs = NULL; e->refcount = 0; - hlist_add_head(&e->hlist, head); + hash_add(tracepoint_table, &e->hlist, hash); return e; } @@ -244,7 +237,7 @@ static struct tracepoint_entry *add_tracepoint(const char *name) */ static inline void remove_tracepoint(struct tracepoint_entry *e) { - hlist_del(&e->hlist); + hash_del(&e->hlist); kfree(e); } @@ -722,6 +715,8 @@ struct notifier_block tracepoint_module_nb = { static int init_tracepoints(void) { + hash_init(tracepoint_table); + return register_module_notifier(&tracepoint_module_nb); } __initcall(init_tracepoints);