Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755587Ab2HVC2c (ORCPT ); Tue, 21 Aug 2012 22:28:32 -0400 Received: from mail-ob0-f174.google.com ([209.85.214.174]:43131 "EHLO mail-ob0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755252Ab2HVC2X (ORCPT ); Tue, 21 Aug 2012 22:28:23 -0400 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 v3 14/17] net,rds: use new hashtable implementation Date: Wed, 22 Aug 2012 04:27:09 +0200 Message-Id: <1345602432-27673-15-git-send-email-levinsasha928@gmail.com> X-Mailer: git-send-email 1.7.8.6 In-Reply-To: <1345602432-27673-1-git-send-email-levinsasha928@gmail.com> References: <1345602432-27673-1-git-send-email-levinsasha928@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 10010 Lines: 316 Switch rds to use the new hashtable implementation. This reduces the amount of generic unrelated code in rds. Signed-off-by: Sasha Levin --- net/rds/bind.c | 28 +++++++++----- net/rds/connection.c | 102 ++++++++++++++++++++++---------------------------- 2 files changed, 63 insertions(+), 67 deletions(-) diff --git a/net/rds/bind.c b/net/rds/bind.c index 637bde5..79d65ce 100644 --- a/net/rds/bind.c +++ b/net/rds/bind.c @@ -36,16 +36,16 @@ #include #include #include +#include #include "rds.h" -#define BIND_HASH_SIZE 1024 -static struct hlist_head bind_hash_table[BIND_HASH_SIZE]; +#define BIND_HASH_BITS 10 +static DEFINE_HASHTABLE(bind_hash_table, BIND_HASH_BITS); static DEFINE_SPINLOCK(rds_bind_lock); -static struct hlist_head *hash_to_bucket(__be32 addr, __be16 port) +static u32 rds_hash(__be32 addr, __be16 port) { - return bind_hash_table + (jhash_2words((u32)addr, (u32)port, 0) & - (BIND_HASH_SIZE - 1)); + return jhash_2words((u32)addr, (u32)port, 0); } static struct rds_sock *rds_bind_lookup(__be32 addr, __be16 port, @@ -53,12 +53,12 @@ static struct rds_sock *rds_bind_lookup(__be32 addr, __be16 port, { struct rds_sock *rs; struct hlist_node *node; - struct hlist_head *head = hash_to_bucket(addr, port); + u32 key = rds_hash(addr, port); u64 cmp; u64 needle = ((u64)be32_to_cpu(addr) << 32) | be16_to_cpu(port); rcu_read_lock(); - hlist_for_each_entry_rcu(rs, node, head, rs_bound_node) { + hash_for_each_possible_rcu(bind_hash_table, rs, node, rs_bound_node, key) { cmp = ((u64)be32_to_cpu(rs->rs_bound_addr) << 32) | be16_to_cpu(rs->rs_bound_port); @@ -74,13 +74,13 @@ static struct rds_sock *rds_bind_lookup(__be32 addr, __be16 port, * make sure our addr and port are set before * we are added to the list, other people * in rcu will find us as soon as the - * hlist_add_head_rcu is done + * hash_add_rcu is done */ insert->rs_bound_addr = addr; insert->rs_bound_port = port; rds_sock_addref(insert); - hlist_add_head_rcu(&insert->rs_bound_node, head); + hash_add_rcu(bind_hash_table, &insert->rs_bound_node, key); } return NULL; } @@ -152,7 +152,7 @@ void rds_remove_bound(struct rds_sock *rs) rs, &rs->rs_bound_addr, ntohs(rs->rs_bound_port)); - hlist_del_init_rcu(&rs->rs_bound_node); + hash_del_rcu(&rs->rs_bound_node); rds_sock_put(rs); rs->rs_bound_addr = 0; } @@ -202,3 +202,11 @@ out: synchronize_rcu(); return ret; } + +static int __init rds_init(void) +{ + hash_init(bind_hash_table); + return 0; +} + +module_init(rds_init); diff --git a/net/rds/connection.c b/net/rds/connection.c index 9e07c75..5b09ee1 100644 --- a/net/rds/connection.c +++ b/net/rds/connection.c @@ -34,28 +34,24 @@ #include #include #include +#include #include #include "rds.h" #include "loop.h" #define RDS_CONNECTION_HASH_BITS 12 -#define RDS_CONNECTION_HASH_ENTRIES (1 << RDS_CONNECTION_HASH_BITS) -#define RDS_CONNECTION_HASH_MASK (RDS_CONNECTION_HASH_ENTRIES - 1) /* converting this to RCU is a chore for another day.. */ static DEFINE_SPINLOCK(rds_conn_lock); static unsigned long rds_conn_count; -static struct hlist_head rds_conn_hash[RDS_CONNECTION_HASH_ENTRIES]; +static DEFINE_HASHTABLE(rds_conn_hash, RDS_CONNECTION_HASH_BITS); static struct kmem_cache *rds_conn_slab; -static struct hlist_head *rds_conn_bucket(__be32 laddr, __be32 faddr) +static unsigned long rds_conn_hashfn(__be32 laddr, __be32 faddr) { /* Pass NULL, don't need struct net for hash */ - unsigned long hash = inet_ehashfn(NULL, - be32_to_cpu(laddr), 0, - be32_to_cpu(faddr), 0); - return &rds_conn_hash[hash & RDS_CONNECTION_HASH_MASK]; + return inet_ehashfn(NULL, be32_to_cpu(laddr), 0, be32_to_cpu(faddr), 0); } #define rds_conn_info_set(var, test, suffix) do { \ @@ -64,14 +60,14 @@ static struct hlist_head *rds_conn_bucket(__be32 laddr, __be32 faddr) } while (0) /* rcu read lock must be held or the connection spinlock */ -static struct rds_connection *rds_conn_lookup(struct hlist_head *head, - __be32 laddr, __be32 faddr, +static struct rds_connection *rds_conn_lookup(__be32 laddr, __be32 faddr, struct rds_transport *trans) { struct rds_connection *conn, *ret = NULL; struct hlist_node *pos; + unsigned long key = rds_conn_hashfn(laddr, faddr); - hlist_for_each_entry_rcu(conn, pos, head, c_hash_node) { + hash_for_each_possible_rcu(rds_conn_hash, conn, pos, c_hash_node, key) { if (conn->c_faddr == faddr && conn->c_laddr == laddr && conn->c_trans == trans) { ret = conn; @@ -117,13 +113,12 @@ static struct rds_connection *__rds_conn_create(__be32 laddr, __be32 faddr, int is_outgoing) { struct rds_connection *conn, *parent = NULL; - struct hlist_head *head = rds_conn_bucket(laddr, faddr); struct rds_transport *loop_trans; unsigned long flags; int ret; rcu_read_lock(); - conn = rds_conn_lookup(head, laddr, faddr, trans); + conn = rds_conn_lookup(laddr, faddr, trans); if (conn && conn->c_loopback && conn->c_trans != &rds_loop_transport && !is_outgoing) { /* This is a looped back IB connection, and we're @@ -224,13 +219,15 @@ static struct rds_connection *__rds_conn_create(__be32 laddr, __be32 faddr, /* Creating normal conn */ struct rds_connection *found; - found = rds_conn_lookup(head, laddr, faddr, trans); + found = rds_conn_lookup(laddr, faddr, trans); if (found) { trans->conn_free(conn->c_transport_data); kmem_cache_free(rds_conn_slab, conn); conn = found; } else { - hlist_add_head_rcu(&conn->c_hash_node, head); + unsigned long key = rds_conn_hashfn(laddr, faddr); + + hash_add_rcu(rds_conn_hash, &conn->c_hash_node, key); rds_cong_add_conn(conn); rds_conn_count++; } @@ -303,7 +300,7 @@ void rds_conn_shutdown(struct rds_connection *conn) * conn - the reconnect is always triggered by the active peer. */ cancel_delayed_work_sync(&conn->c_conn_w); rcu_read_lock(); - if (!hlist_unhashed(&conn->c_hash_node)) { + if (hash_hashed(&conn->c_hash_node)) { rcu_read_unlock(); rds_queue_reconnect(conn); } else { @@ -329,7 +326,7 @@ void rds_conn_destroy(struct rds_connection *conn) /* Ensure conn will not be scheduled for reconnect */ spin_lock_irq(&rds_conn_lock); - hlist_del_init_rcu(&conn->c_hash_node); + hash_del(&conn->c_hash_node); spin_unlock_irq(&rds_conn_lock); synchronize_rcu(); @@ -375,7 +372,6 @@ static void rds_conn_message_info(struct socket *sock, unsigned int len, struct rds_info_lengths *lens, int want_send) { - struct hlist_head *head; struct hlist_node *pos; struct list_head *list; struct rds_connection *conn; @@ -388,27 +384,24 @@ static void rds_conn_message_info(struct socket *sock, unsigned int len, rcu_read_lock(); - for (i = 0, head = rds_conn_hash; i < ARRAY_SIZE(rds_conn_hash); - i++, head++) { - hlist_for_each_entry_rcu(conn, pos, head, c_hash_node) { - if (want_send) - list = &conn->c_send_queue; - else - list = &conn->c_retrans; - - spin_lock_irqsave(&conn->c_lock, flags); - - /* XXX too lazy to maintain counts.. */ - list_for_each_entry(rm, list, m_conn_item) { - total++; - if (total <= len) - rds_inc_info_copy(&rm->m_inc, iter, - conn->c_laddr, - conn->c_faddr, 0); - } - - spin_unlock_irqrestore(&conn->c_lock, flags); + hash_for_each_rcu(rds_conn_hash, i, pos, conn, c_hash_node) { + if (want_send) + list = &conn->c_send_queue; + else + list = &conn->c_retrans; + + spin_lock_irqsave(&conn->c_lock, flags); + + /* XXX too lazy to maintain counts.. */ + list_for_each_entry(rm, list, m_conn_item) { + total++; + if (total <= len) + rds_inc_info_copy(&rm->m_inc, iter, + conn->c_laddr, + conn->c_faddr, 0); } + + spin_unlock_irqrestore(&conn->c_lock, flags); } rcu_read_unlock(); @@ -438,7 +431,6 @@ void rds_for_each_conn_info(struct socket *sock, unsigned int len, size_t item_len) { uint64_t buffer[(item_len + 7) / 8]; - struct hlist_head *head; struct hlist_node *pos; struct rds_connection *conn; size_t i; @@ -448,23 +440,19 @@ void rds_for_each_conn_info(struct socket *sock, unsigned int len, lens->nr = 0; lens->each = item_len; - for (i = 0, head = rds_conn_hash; i < ARRAY_SIZE(rds_conn_hash); - i++, head++) { - hlist_for_each_entry_rcu(conn, pos, head, c_hash_node) { - - /* XXX no c_lock usage.. */ - if (!visitor(conn, buffer)) - continue; - - /* We copy as much as we can fit in the buffer, - * but we count all items so that the caller - * can resize the buffer. */ - if (len >= item_len) { - rds_info_copy(iter, buffer, item_len); - len -= item_len; - } - lens->nr++; + hash_for_each_rcu(rds_conn_hash, i, pos, conn, c_hash_node) { + /* XXX no c_lock usage.. */ + if (!visitor(conn, buffer)) + continue; + + /* We copy as much as we can fit in the buffer, + * but we count all items so that the caller + * can resize the buffer. */ + if (len >= item_len) { + rds_info_copy(iter, buffer, item_len); + len -= item_len; } + lens->nr++; } rcu_read_unlock(); } @@ -518,6 +506,8 @@ int rds_conn_init(void) rds_info_register_func(RDS_INFO_RETRANS_MESSAGES, rds_conn_message_info_retrans); + hash_init(rds_conn_hash); + return 0; } @@ -525,8 +515,6 @@ void rds_conn_exit(void) { rds_loop_exit(); - WARN_ON(!hlist_empty(rds_conn_hash)); - kmem_cache_destroy(rds_conn_slab); rds_info_deregister_func(RDS_INFO_CONNECTIONS, rds_conn_info); -- 1.7.8.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/