From: Aaron Conole <aconole@redhat.com>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: netdev@vger.kernel.org, linux-rt-devel@lists.linux.dev,
dev@openvswitch.org, Ilya Maximets <i.maximets@ovn.org>,
Eric Dumazet <edumazet@google.com>,
Simon Horman <horms@kernel.org>,
Jakub Kicinski <kuba@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Paolo Abeni <pabeni@redhat.com>,
"David S. Miller" <davem@davemloft.net>
Subject: Re: [ovs-dev] [PATCH net-next v3 12/18] openvswitch: Move ovs_frag_data_storage into the struct ovs_pcpu_storage
Date: Mon, 05 May 2025 08:34:35 -0400 [thread overview]
Message-ID: <f7t7c2vdyn8.fsf@redhat.com> (raw)
In-Reply-To: <20250430124758.1159480-13-bigeasy@linutronix.de> (Sebastian Andrzej Siewior's message of "Wed, 30 Apr 2025 14:47:52 +0200")
Sebastian Andrzej Siewior <bigeasy@linutronix.de> writes:
> ovs_frag_data_storage is a per-CPU variable and relies on disabled BH for its
> locking. Without per-CPU locking in local_bh_disable() on PREEMPT_RT
> this data structure requires explicit locking.
>
> Move ovs_frag_data_storage into the struct ovs_pcpu_storage which already
> provides locking for the structure.
>
> Cc: Aaron Conole <aconole@redhat.com>
> Cc: Eelco Chaudron <echaudro@redhat.com>
> Cc: Ilya Maximets <i.maximets@ovn.org>
> Cc: dev@openvswitch.org
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> ---
Tested it with the same script, and see that it preforms inline with my
unpatched results. This is without CONFIG_PREEMPT, so I didn't do any
checks on a 'RT' system. That does make me wonder whether it really is
my system or something in the way local lock is being used, or even a
misunderstanding about the possible contention scenarios.
I also did check the openvswitch userspace kernel test suite and that
also passes. So looks good that way.
next prev parent reply other threads:[~2025-05-05 12:34 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-30 12:47 [PATCH net-next v3 00/18] net: Cover more per-CPU storage with local nested BH locking Sebastian Andrzej Siewior
2025-04-30 12:47 ` [PATCH net-next v3 01/18] net: page_pool: Don't recycle into cache on PREEMPT_RT Sebastian Andrzej Siewior
2025-05-19 8:18 ` Ilias Apalodimas
2025-04-30 12:47 ` [PATCH net-next v3 02/18] net: dst_cache: Use nested-BH locking for dst_cache::cache Sebastian Andrzej Siewior
2025-04-30 12:47 ` [PATCH net-next v3 03/18] ipv4/route: Use this_cpu_inc() for stats on PREEMPT_RT Sebastian Andrzej Siewior
2025-04-30 12:47 ` [PATCH net-next v3 04/18] ipv6: sr: Use nested-BH locking for hmac_storage Sebastian Andrzej Siewior
2025-04-30 12:47 ` [PATCH net-next v3 05/18] xdp: Use nested-BH locking for system_page_pool Sebastian Andrzej Siewior
2025-04-30 14:20 ` Jesper Dangaard Brouer
2025-05-01 10:13 ` Toke Høiland-Jørgensen
2025-05-02 13:32 ` Sebastian Andrzej Siewior
2025-05-02 14:33 ` Toke Høiland-Jørgensen
2025-05-02 15:07 ` Sebastian Andrzej Siewior
2025-05-02 15:59 ` Toke Høiland-Jørgensen
2025-05-05 8:57 ` Sebastian Andrzej Siewior
2025-05-05 9:13 ` Toke Høiland-Jørgensen
2025-04-30 12:47 ` [PATCH net-next v3 06/18] netfilter: nf_dup{4, 6}: Move duplication check to task_struct Sebastian Andrzej Siewior
2025-04-30 12:47 ` [PATCH net-next v3 07/18] netfilter: nft_inner: Use nested-BH locking for nft_pcpu_tun_ctx Sebastian Andrzej Siewior
2025-04-30 12:47 ` [PATCH net-next v3 08/18] netfilter: nf_dup_netdev: Move the recursion counter struct netdev_xmit Sebastian Andrzej Siewior
2025-04-30 12:47 ` [PATCH net-next v3 09/18] xfrm: Use nested-BH locking for nat_keepalive_sk_ipv[46] Sebastian Andrzej Siewior
2025-04-30 12:47 ` [PATCH net-next v3 10/18] openvswitch: Merge three per-CPU structures into one Sebastian Andrzej Siewior
2025-04-30 12:47 ` [PATCH net-next v3 11/18] openvswitch: Use nested-BH locking for ovs_pcpu_storage Sebastian Andrzej Siewior
2025-04-30 12:47 ` [PATCH net-next v3 12/18] openvswitch: Move ovs_frag_data_storage into the struct ovs_pcpu_storage Sebastian Andrzej Siewior
2025-05-05 12:34 ` Aaron Conole [this message]
2025-04-30 12:47 ` [PATCH net-next v3 13/18] net/sched: act_mirred: Move the recursion counter struct netdev_xmit Sebastian Andrzej Siewior
2025-04-30 12:47 ` [PATCH net-next v3 14/18] net/sched: Use nested-BH locking for sch_frag_data_storage Sebastian Andrzej Siewior
2025-04-30 12:47 ` [PATCH net-next v3 15/18] mptcp: Use nested-BH locking for hmac_storage Sebastian Andrzej Siewior
2025-04-30 12:47 ` [PATCH net-next v3 16/18] rds: Disable only bottom halves in rds_page_remainder_alloc() Sebastian Andrzej Siewior
2025-04-30 12:47 ` [PATCH net-next v3 17/18] rds: Acquire per-CPU pointer within BH disabled section Sebastian Andrzej Siewior
2025-04-30 12:47 ` [PATCH net-next v3 18/18] rds: Use nested-BH locking for rds_page_remainder Sebastian Andrzej Siewior
2025-05-05 23:02 ` [PATCH net-next v3 00/18] net: Cover more per-CPU storage with local nested BH locking Jakub Kicinski
2025-05-09 11:58 ` Sebastian Andrzej Siewior
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