From: Oleg Nesterov <oleg@redhat.com>
To: David Howells <dhowells@redhat.com>
Cc: Marc Dionne <marc.dionne@auristor.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Chuck Lever <chuck.lever@oracle.com>,
linux-afs@lists.infradead.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] rxrpc_find_service_conn_rcu: use read_seqbegin() rather than read_seqbegin_or_lock()
Date: Wed, 1 Nov 2023 23:15:02 +0100 [thread overview]
Message-ID: <20231101221502.GE32034@redhat.com> (raw)
In-Reply-To: <1959032.1698873608@warthog.procyon.org.uk>
On 11/01, David Howells wrote:
>
> However, I think just changing all of these to always-lockless isn't
> necessarily the most optimal way.
Yes, but so far I am trying to change the users which never take the
lock for writing, so this patch doesn't change the current behaviour.
> I wonder if struct seqlock would make more sense with an rwlock rather than a
> spinlock. As it is, it does an exclusive spinlock for the readpath which is
> kind of overkill.
Heh. Please see
[PATCH 4/5] seqlock: introduce read_seqcount_begin_or_lock() and friends
https://lore.kernel.org/all/20230913155005.GA26252@redhat.com/
I am going to return to this later.
Oleg.
next prev parent reply other threads:[~2023-11-01 22:17 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-27 9:58 [PATCH] rxrpc_find_service_conn_rcu: use read_seqbegin() rather than read_seqbegin_or_lock() Oleg Nesterov
2023-10-27 10:00 ` Oleg Nesterov
2023-11-01 15:45 ` David Howells
2023-11-01 20:23 ` Oleg Nesterov
2023-11-01 20:40 ` Oleg Nesterov
2023-11-01 21:22 ` David Howells
2023-11-01 22:38 ` Oleg Nesterov
2023-11-01 20:52 ` Al Viro
2023-11-01 21:52 ` Oleg Nesterov
2023-11-01 22:48 ` Al Viro
2023-11-01 23:17 ` Oleg Nesterov
2023-11-01 21:20 ` David Howells
2023-11-01 22:15 ` Oleg Nesterov [this message]
2023-11-01 22:29 ` Oleg Nesterov
2023-11-16 13:18 ` Oleg Nesterov
2023-11-16 13:41 ` David Howells
2023-11-16 14:19 ` Oleg Nesterov
2023-11-16 15:02 ` David Howells
2023-11-16 15:06 ` Oleg Nesterov
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