From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: Jesper Dangaard Brouer <hawk@kernel.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
"David S. Miller" <davem@davemloft.net>,
Boqun Feng <boqun.feng@gmail.com>,
Daniel Borkmann <daniel@iogearbox.net>,
Eric Dumazet <edumazet@google.com>,
Frederic Weisbecker <frederic@kernel.org>,
Ingo Molnar <mingo@redhat.com>, Jakub Kicinski <kuba@kernel.org>,
Paolo Abeni <pabeni@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Waiman Long <longman@redhat.com>, Will Deacon <will@kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
Eduard Zingerman <eddyz87@gmail.com>, Hao Luo <haoluo@google.com>,
Jiri Olsa <jolsa@kernel.org>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Song Liu <song@kernel.org>, Stanislav Fomichev <sdf@google.com>,
Yonghong Song <yonghong.song@linux.dev>,
bpf@vger.kernel.org
Subject: Re: [PATCH v3 net-next 14/15] net: Reference bpf_redirect_info via task_struct on PREEMPT_RT.
Date: Wed, 05 Jun 2024 12:37:36 +0200 [thread overview]
Message-ID: <871q5bad5b.fsf@toke.dk> (raw)
In-Reply-To: <9afab1bb-43d6-4f17-b45d-7f4569d9db70@kernel.org>
Jesper Dangaard Brouer <hawk@kernel.org> writes:
> On 31/05/2024 12.38, Sebastian Andrzej Siewior wrote:
>> On 2024-05-30 00:09:21 [+0200], Toke Høiland-Jørgensen wrote:
>>> [...]
>>>> @@ -240,12 +240,14 @@ static int cpu_map_bpf_prog_run(struct bpf_cpu_map_entry *rcpu, void **frames,
>>>> int xdp_n, struct xdp_cpumap_stats *stats,
>>>> struct list_head *list)
>>>> {
>>>> + struct bpf_net_context __bpf_net_ctx, *bpf_net_ctx;
>>>> int nframes;
> >>
>>> I think we need to zero-initialise all the context objects we allocate
>>> on the stack.
>>>
>> Okay, I can do that.
>
> Hmm, but how will this affect performance?
My hunch would be that this would be in a cache line we're touching
anyway, so it won't make much difference? But better measure, I suppose :)
-Toke
next prev parent reply other threads:[~2024-06-05 10:37 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-29 16:02 [PATCH v3 net-next 00/15] locking: Introduce nested-BH locking Sebastian Andrzej Siewior
2024-05-29 16:02 ` [PATCH v3 net-next 01/15] locking/local_lock: Introduce guard definition for local_lock Sebastian Andrzej Siewior
2024-05-29 16:02 ` [PATCH v3 net-next 02/15] locking/local_lock: Add local nested BH locking infrastructure Sebastian Andrzej Siewior
2024-05-29 16:02 ` [PATCH v3 net-next 03/15] net: Use __napi_alloc_frag_align() instead of open coding it Sebastian Andrzej Siewior
2024-05-29 16:02 ` [PATCH v3 net-next 04/15] net: Use nested-BH locking for napi_alloc_cache Sebastian Andrzej Siewior
2024-05-29 16:02 ` [PATCH v3 net-next 05/15] net/tcp_sigpool: Use nested-BH locking for sigpool_scratch Sebastian Andrzej Siewior
2024-05-29 16:02 ` [PATCH v3 net-next 06/15] net/ipv4: Use nested-BH locking for ipv4_tcp_sk Sebastian Andrzej Siewior
2024-05-29 16:02 ` [PATCH v3 net-next 07/15] netfilter: br_netfilter: Use nested-BH locking for brnf_frag_data_storage Sebastian Andrzej Siewior
2024-05-29 16:02 ` [PATCH v3 net-next 08/15] net: softnet_data: Make xmit.recursion per task Sebastian Andrzej Siewior
2024-05-29 16:02 ` [PATCH v3 net-next 09/15] dev: Remove PREEMPT_RT ifdefs from backlog_lock.*() Sebastian Andrzej Siewior
2024-05-29 16:02 ` [PATCH v3 net-next 10/15] dev: Use nested-BH locking for softnet_data.process_queue Sebastian Andrzej Siewior
2024-05-29 16:02 ` [PATCH v3 net-next 11/15] lwt: Don't disable migration prio invoking BPF Sebastian Andrzej Siewior
2024-05-29 16:02 ` [PATCH v3 net-next 12/15] seg6: Use nested-BH locking for seg6_bpf_srh_states Sebastian Andrzej Siewior
2024-05-29 16:02 ` [PATCH v3 net-next 13/15] net: Use nested-BH locking for bpf_scratchpad Sebastian Andrzej Siewior
2024-05-29 16:02 ` [PATCH v3 net-next 14/15] net: Reference bpf_redirect_info via task_struct on PREEMPT_RT Sebastian Andrzej Siewior
2024-05-29 21:09 ` Alexei Starovoitov
2024-05-29 22:09 ` Toke Høiland-Jørgensen
2024-05-31 10:38 ` Sebastian Andrzej Siewior
2024-06-05 10:28 ` Jesper Dangaard Brouer
2024-06-05 10:37 ` Toke Høiland-Jørgensen [this message]
2024-06-05 10:41 ` Sebastian Andrzej Siewior
2024-06-05 11:55 ` Jesper Dangaard Brouer
2024-05-29 16:02 ` [PATCH v3 net-next 15/15] net: Move per-CPU flush-lists to bpf_net_context " Sebastian Andrzej Siewior
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