netdev - [PATCH] net: convert TCP/DCCP ehash rwlocks to spinlocks

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Date:	Thu, 20 Nov 2008 19:53:56 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	"David S. Miller" <davem@...emloft.net>
CC:	Linux Netdev List <netdev@...r.kernel.org>
Subject: [PATCH] net: convert TCP/DCCP ehash rwlocks to spinlocks

Now TCP & DCCP use RCU lookups, we can convert ehash rwlocks to spinlocks.

/proc/net/tcp and other seq_file 'readers' can safely be converted to 'writers'.

This should speedup writers, since spin_lock()/spin_unlock()
only use one atomic operation instead of two for write_lock()/write_unlock()

Signed-off-by: Eric Dumazet <dada1@...mosbay.com>
---
 include/net/inet_hashtables.h |   14 +++++++-------
 net/ipv4/inet_hashtables.c    |   21 ++++++++++-----------
 net/ipv4/inet_timewait_sock.c |   22 +++++++++++-----------
 net/ipv4/tcp_ipv4.c           |   12 ++++++------
 net/ipv6/inet6_hashtables.c   |   15 +++++++--------
 5 files changed, 41 insertions(+), 43 deletions(-)

View attachment "ehash_rwlock_to_spinlock.patch" of type "text/plain" (10329 bytes)