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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Subject: [PATCH 1/2] Workqueue: net: replace use of system_wq with system_percpu_wq Date: Fri, 15 Aug 2025 11:48:07 +0200 Message-ID: <20250815094808.54888-2-marco.crivellari@suse.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250815094808.54888-1-marco.crivellari@suse.com> References: <20250815094808.54888-1-marco.crivellari@suse.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Currently if a user enqueue a work item using schedule_delayed_work() the used wq is "system_wq" (per-cpu wq) while queue_delayed_work() use WORK_CPU_UNBOUND (used when a cpu is not specified). The same applies to schedule_work() that is using system_wq and queue_work(), that makes use again of WORK_CPU_UNBOUND. This lack of consistentcy cannot be addressed without refactoring the API. system_wq is a per-CPU worqueue, yet nothing in its name tells about that CPU affinity constraint, which is very often not required by users. Make it clear by adding a system_percpu_wq to all the network subsystem. The old wq will be kept for a few release cylces. Suggested-by: Tejun Heo Signed-off-by: Marco Crivellari --- net/bridge/br_cfm.c | 6 +++--- net/bridge/br_mrp.c | 8 ++++---- net/ceph/mon_client.c | 2 +- net/core/skmsg.c | 2 +- net/devlink/core.c | 2 +- net/ipv4/inet_fragment.c | 2 +- net/netfilter/nf_conntrack_ecache.c | 2 +- net/openvswitch/dp_notify.c | 2 +- net/rfkill/input.c | 2 +- net/smc/smc_core.c | 2 +- net/vmw_vsock/af_vsock.c | 2 +- 11 files changed, 16 insertions(+), 16 deletions(-) diff --git a/net/bridge/br_cfm.c b/net/bridge/br_cfm.c index a3c755d0a09d..c2c1c7d44c61 100644 --- a/net/bridge/br_cfm.c +++ b/net/bridge/br_cfm.c @@ -134,7 +134,7 @@ static void ccm_rx_timer_start(struct br_cfm_peer_mep *= peer_mep) * of the configured CC 'expected_interval' * in order to detect CCM defect after 3.25 interval. */ - queue_delayed_work(system_wq, &peer_mep->ccm_rx_dwork, + queue_delayed_work(system_percpu_wq, &peer_mep->ccm_rx_dwork, usecs_to_jiffies(interval_us / 4)); } =20 @@ -285,7 +285,7 @@ static void ccm_tx_work_expired(struct work_struct *wor= k) ccm_frame_tx(skb); =20 interval_us =3D interval_to_us(mep->cc_config.exp_interval); - queue_delayed_work(system_wq, &mep->ccm_tx_dwork, + queue_delayed_work(system_percpu_wq, &mep->ccm_tx_dwork, usecs_to_jiffies(interval_us)); } =20 @@ -809,7 +809,7 @@ int br_cfm_cc_ccm_tx(struct net_bridge *br, const u32 i= nstance, * to send first frame immediately */ mep->ccm_tx_end =3D jiffies + usecs_to_jiffies(tx_info->period * 1000000); - queue_delayed_work(system_wq, &mep->ccm_tx_dwork, 0); + queue_delayed_work(system_percpu_wq, &mep->ccm_tx_dwork, 0); =20 save: mep->cc_ccm_tx_info =3D *tx_info; diff --git a/net/bridge/br_mrp.c b/net/bridge/br_mrp.c index fd2de35ffb3c..3c36fa24bc05 100644 --- a/net/bridge/br_mrp.c +++ b/net/bridge/br_mrp.c @@ -341,7 +341,7 @@ static void br_mrp_test_work_expired(struct work_struct= *work) out: rcu_read_unlock(); =20 - queue_delayed_work(system_wq, &mrp->test_work, + queue_delayed_work(system_percpu_wq, &mrp->test_work, usecs_to_jiffies(mrp->test_interval)); } =20 @@ -418,7 +418,7 @@ static void br_mrp_in_test_work_expired(struct work_str= uct *work) out: rcu_read_unlock(); =20 - queue_delayed_work(system_wq, &mrp->in_test_work, + queue_delayed_work(system_percpu_wq, &mrp->in_test_work, usecs_to_jiffies(mrp->in_test_interval)); } =20 @@ -725,7 +725,7 @@ int br_mrp_start_test(struct net_bridge *br, mrp->test_max_miss =3D test->max_miss; mrp->test_monitor =3D test->monitor; mrp->test_count_miss =3D 0; - queue_delayed_work(system_wq, &mrp->test_work, + queue_delayed_work(system_percpu_wq, &mrp->test_work, usecs_to_jiffies(test->interval)); =20 return 0; @@ -865,7 +865,7 @@ int br_mrp_start_in_test(struct net_bridge *br, mrp->in_test_end =3D jiffies + usecs_to_jiffies(in_test->period); mrp->in_test_max_miss =3D in_test->max_miss; mrp->in_test_count_miss =3D 0; - queue_delayed_work(system_wq, &mrp->in_test_work, + queue_delayed_work(system_percpu_wq, &mrp->in_test_work, usecs_to_jiffies(in_test->interval)); =20 return 0; diff --git a/net/ceph/mon_client.c b/net/ceph/mon_client.c index ab66b599ac47..c227ececa925 100644 --- a/net/ceph/mon_client.c +++ b/net/ceph/mon_client.c @@ -314,7 +314,7 @@ static void __schedule_delayed(struct ceph_mon_client *= monc) delay =3D CEPH_MONC_PING_INTERVAL; =20 dout("__schedule_delayed after %lu\n", delay); - mod_delayed_work(system_wq, &monc->delayed_work, + mod_delayed_work(system_percpu_wq, &monc->delayed_work, round_jiffies_relative(delay)); } =20 diff --git a/net/core/skmsg.c b/net/core/skmsg.c index 0ddc4c718833..83fc433f5461 100644 --- a/net/core/skmsg.c +++ b/net/core/skmsg.c @@ -855,7 +855,7 @@ void sk_psock_drop(struct sock *sk, struct sk_psock *ps= ock) sk_psock_stop(psock); =20 INIT_RCU_WORK(&psock->rwork, sk_psock_destroy); - queue_rcu_work(system_wq, &psock->rwork); + queue_rcu_work(system_percpu_wq, &psock->rwork); } EXPORT_SYMBOL_GPL(sk_psock_drop); =20 diff --git a/net/devlink/core.c b/net/devlink/core.c index 7203c39532fc..58093f49c090 100644 --- a/net/devlink/core.c +++ b/net/devlink/core.c @@ -320,7 +320,7 @@ static void devlink_release(struct work_struct *work) void devlink_put(struct devlink *devlink) { if (refcount_dec_and_test(&devlink->refcount)) - queue_rcu_work(system_wq, &devlink->rwork); + queue_rcu_work(system_percpu_wq, &devlink->rwork); } =20 struct devlink *devlinks_xa_find_get(struct net *net, unsigned long *index= p) diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c index 470ab17ceb51..025895eb6ec5 100644 --- a/net/ipv4/inet_fragment.c +++ b/net/ipv4/inet_fragment.c @@ -183,7 +183,7 @@ static void fqdir_work_fn(struct work_struct *work) rhashtable_free_and_destroy(&fqdir->rhashtable, inet_frags_free_cb, NULL); =20 if (llist_add(&fqdir->free_list, &fqdir_free_list)) - queue_delayed_work(system_wq, &fqdir_free_work, HZ); + queue_delayed_work(system_percpu_wq, &fqdir_free_work, HZ); } =20 int fqdir_init(struct fqdir **fqdirp, struct inet_frags *f, struct net *ne= t) diff --git a/net/netfilter/nf_conntrack_ecache.c b/net/netfilter/nf_conntra= ck_ecache.c index af68c64acaab..81baf2082604 100644 --- a/net/netfilter/nf_conntrack_ecache.c +++ b/net/netfilter/nf_conntrack_ecache.c @@ -301,7 +301,7 @@ void nf_conntrack_ecache_work(struct net *net, enum nf_= ct_ecache_state state) net->ct.ecache_dwork_pending =3D true; } else if (state =3D=3D NFCT_ECACHE_DESTROY_SENT) { if (!hlist_nulls_empty(&cnet->ecache.dying_list)) - mod_delayed_work(system_wq, &cnet->ecache.dwork, 0); + mod_delayed_work(system_percpu_wq, &cnet->ecache.dwork, 0); else net->ct.ecache_dwork_pending =3D false; } diff --git a/net/openvswitch/dp_notify.c b/net/openvswitch/dp_notify.c index 7af0cde8b293..a2af90ee99af 100644 --- a/net/openvswitch/dp_notify.c +++ b/net/openvswitch/dp_notify.c @@ -75,7 +75,7 @@ static int dp_device_event(struct notifier_block *unused,= unsigned long event, =20 /* schedule vport destroy, dev_put and genl notification */ ovs_net =3D net_generic(dev_net(dev), ovs_net_id); - queue_work(system_wq, &ovs_net->dp_notify_work); + queue_work(system_percpu_wq, &ovs_net->dp_notify_work); } =20 return NOTIFY_DONE; diff --git a/net/rfkill/input.c b/net/rfkill/input.c index 598d0a61bda7..53d286b10843 100644 --- a/net/rfkill/input.c +++ b/net/rfkill/input.c @@ -159,7 +159,7 @@ static void rfkill_schedule_global_op(enum rfkill_sched= _op op) rfkill_op_pending =3D true; if (op =3D=3D RFKILL_GLOBAL_OP_EPO && !rfkill_is_epo_lock_active()) { /* bypass the limiter for EPO */ - mod_delayed_work(system_wq, &rfkill_op_work, 0); + mod_delayed_work(system_percpu_wq, &rfkill_op_work, 0); rfkill_last_scheduled =3D jiffies; } else rfkill_schedule_ratelimited(); diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c index ac07b963aede..ab870109f916 100644 --- a/net/smc/smc_core.c +++ b/net/smc/smc_core.c @@ -85,7 +85,7 @@ static void smc_lgr_schedule_free_work(struct smc_link_gr= oup *lgr) * otherwise there is a risk of out-of-sync link groups. */ if (!lgr->freeing) { - mod_delayed_work(system_wq, &lgr->free_work, + mod_delayed_work(system_percpu_wq, &lgr->free_work, (!lgr->is_smcd && lgr->role =3D=3D SMC_CLNT) ? 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Fri, 15 Aug 2025 02:48:16 -0700 (PDT) Received: from localhost.localdomain ([2a00:6d43:105:c401:e307:1a37:2e76:ce91]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45a223299ebsm12943805e9.23.2025.08.15.02.48.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Aug 2025 02:48:15 -0700 (PDT) From: Marco Crivellari To: linux-kernel@vger.kernel.org Cc: Tejun Heo , Lai Jiangshan , Thomas Gleixner , Frederic Weisbecker , Sebastian Andrzej Siewior , Marco Crivellari , Michal Hocko , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Subject: [PATCH 2/2] Workqueue: net: WQ_PERCPU added to alloc_workqueue users Date: Fri, 15 Aug 2025 11:48:08 +0200 Message-ID: <20250815094808.54888-3-marco.crivellari@suse.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250815094808.54888-1-marco.crivellari@suse.com> References: <20250815094808.54888-1-marco.crivellari@suse.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Currently if a user enqueue a work item using schedule_delayed_work() the used wq is "system_wq" (per-cpu wq) while queue_delayed_work() use WORK_CPU_UNBOUND (used when a cpu is not specified). The same applies to schedule_work() that is using system_wq and queue_work(), that makes use again of WORK_CPU_UNBOUND. This lack of consistentcy cannot be addressed without refactoring the API. alloc_workqueue() treats all queues as per-CPU by default, while unbound workqueues must opt-in via WQ_UNBOUND. This default is suboptimal: most workloads benefit from unbound queues, allowing the scheduler to place worker threads where they=E2=80=99re needed= and reducing noise when CPUs are isolated. This patch adds a new WQ_PERCPU flag at the network subsystem, to explicitly request the use of the per-CPU behavior. Both flags coexist for one release cycle to allow callers to transition their calls. Once migration is complete, WQ_UNBOUND can be removed and unbound will become the implicit default. With the introduction of the WQ_PERCPU flag (equivalent to !WQ_UNBOUND), any alloc_workqueue() caller that doesn=E2=80=99t explicitly specify WQ_UNB= OUND must now use WQ_PERCPU. All existing users have been updated accordingly. Suggested-by: Tejun Heo Signed-off-by: Marco Crivellari --- net/ceph/messenger.c | 3 ++- net/core/sock_diag.c | 2 +- net/rds/ib_rdma.c | 3 ++- net/rxrpc/rxperf.c | 2 +- net/smc/af_smc.c | 6 +++--- net/smc/smc_core.c | 2 +- net/tls/tls_device.c | 2 +- net/vmw_vsock/virtio_transport.c | 2 +- net/vmw_vsock/vsock_loopback.c | 2 +- 9 files changed, 13 insertions(+), 11 deletions(-) diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index d1b5705dc0c6..183c1e0b405a 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -252,7 +252,8 @@ int __init ceph_msgr_init(void) * The number of active work items is limited by the number of * connections, so leave @max_active at default. */ - ceph_msgr_wq =3D alloc_workqueue("ceph-msgr", WQ_MEM_RECLAIM, 0); + ceph_msgr_wq =3D alloc_workqueue("ceph-msgr", + WQ_MEM_RECLAIM | WQ_PERCPU, 0); if (ceph_msgr_wq) return 0; =20 diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c index a08eed9b9142..dcd7e8c02169 100644 --- a/net/core/sock_diag.c +++ b/net/core/sock_diag.c @@ -350,7 +350,7 @@ static struct pernet_operations diag_net_ops =3D { =20 static int __init sock_diag_init(void) { - broadcast_wq =3D alloc_workqueue("sock_diag_events", 0, 0); + broadcast_wq =3D alloc_workqueue("sock_diag_events", WQ_PERCPU, 0); BUG_ON(!broadcast_wq); return register_pernet_subsys(&diag_net_ops); } diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c index d1cfceeff133..6585164c7059 100644 --- a/net/rds/ib_rdma.c +++ b/net/rds/ib_rdma.c @@ -672,7 +672,8 @@ struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds= _ib_device *rds_ibdev, =20 int rds_ib_mr_init(void) { - rds_ib_mr_wq =3D alloc_workqueue("rds_mr_flushd", WQ_MEM_RECLAIM, 0); + rds_ib_mr_wq =3D alloc_workqueue("rds_mr_flushd", + WQ_MEM_RECLAIM | WQ_PERCPU, 0); if (!rds_ib_mr_wq) return -ENOMEM; return 0; diff --git a/net/rxrpc/rxperf.c b/net/rxrpc/rxperf.c index e848a4777b8c..a92a2b05c19a 100644 --- a/net/rxrpc/rxperf.c +++ b/net/rxrpc/rxperf.c @@ -584,7 +584,7 @@ static int __init rxperf_init(void) =20 pr_info("Server registering\n"); =20 - rxperf_workqueue =3D alloc_workqueue("rxperf", 0, 0); + rxperf_workqueue =3D alloc_workqueue("rxperf", WQ_PERCPU, 0); if (!rxperf_workqueue) goto error_workqueue; =20 diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index 3e6cb35baf25..f69d5657438b 100644 --- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -3518,15 +3518,15 @@ static int __init smc_init(void) =20 rc =3D -ENOMEM; =20 - smc_tcp_ls_wq =3D alloc_workqueue("smc_tcp_ls_wq", 0, 0); + smc_tcp_ls_wq =3D alloc_workqueue("smc_tcp_ls_wq", WQ_PERCPU, 0); if (!smc_tcp_ls_wq) goto out_pnet; =20 - smc_hs_wq =3D alloc_workqueue("smc_hs_wq", 0, 0); + smc_hs_wq =3D alloc_workqueue("smc_hs_wq", WQ_PERCPU, 0); if (!smc_hs_wq) goto out_alloc_tcp_ls_wq; =20 - smc_close_wq =3D alloc_workqueue("smc_close_wq", 0, 0); + smc_close_wq =3D alloc_workqueue("smc_close_wq", WQ_PERCPU, 0); if (!smc_close_wq) goto out_alloc_hs_wq; =20 diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c index ab870109f916..9d9a703e884e 100644 --- a/net/smc/smc_core.c +++ b/net/smc/smc_core.c @@ -896,7 +896,7 @@ static int smc_lgr_create(struct smc_sock *smc, struct = smc_init_info *ini) rc =3D SMC_CLC_DECL_MEM; goto ism_put_vlan; } - lgr->tx_wq =3D alloc_workqueue("smc_tx_wq-%*phN", 0, 0, + lgr->tx_wq =3D alloc_workqueue("smc_tx_wq-%*phN", WQ_PERCPU, 0, SMC_LGR_ID_SIZE, &lgr->id); if (!lgr->tx_wq) { rc =3D -ENOMEM; diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c index f672a62a9a52..939466316761 100644 --- a/net/tls/tls_device.c +++ b/net/tls/tls_device.c @@ -1410,7 +1410,7 @@ int __init tls_device_init(void) if (!dummy_page) return -ENOMEM; =20 - destruct_wq =3D alloc_workqueue("ktls_device_destruct", 0, 0); + destruct_wq =3D alloc_workqueue("ktls_device_destruct", WQ_PERCPU, 0); if (!destruct_wq) { err =3D -ENOMEM; goto err_free_dummy; diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transp= ort.c index f0e48e6911fc..b3e960108e6b 100644 --- a/net/vmw_vsock/virtio_transport.c +++ b/net/vmw_vsock/virtio_transport.c @@ -916,7 +916,7 @@ static int __init virtio_vsock_init(void) { int ret; =20 - virtio_vsock_workqueue =3D alloc_workqueue("virtio_vsock", 0, 0); + virtio_vsock_workqueue =3D alloc_workqueue("virtio_vsock", WQ_PERCPU, 0); if (!virtio_vsock_workqueue) return -ENOMEM; =20 diff --git a/net/vmw_vsock/vsock_loopback.c b/net/vmw_vsock/vsock_loopback.c index 6e78927a598e..bc2ff918b315 100644 --- a/net/vmw_vsock/vsock_loopback.c +++ b/net/vmw_vsock/vsock_loopback.c @@ -139,7 +139,7 @@ static int __init vsock_loopback_init(void) struct vsock_loopback *vsock =3D &the_vsock_loopback; int ret; =20 - vsock->workqueue =3D alloc_workqueue("vsock-loopback", 0, 0); + vsock->workqueue =3D alloc_workqueue("vsock-loopback", WQ_PERCPU, 0); if (!vsock->workqueue) return -ENOMEM; =20 --=20 2.50.1