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clUEgzT0BmHGZb9lOyg67ZrTL5AdjogrpftbsToUXhTcPJPGIQF7amhCqvyyZTuPeetoHOtN eEkqkSyTX8nkvJq2Qifj2tviF9A1YjGeZEe7g3eDUkc+bjc4QmfEagoZ9SqOluhXQsdHWfth a2Glxctjrq//oHnnh/KbXICHNQaT+PtWSzh6qfFklg0UjN/IYhPftMZH60lF0ZEsq2/4t+Ta L2U4+TIizjRnhFZuCtCDwQZEeUhO2zyt0vqvFeKaMBcZyosyuAvmu/WRcrTm6k3Qmjfr9toH 0XZDLPw6Pe5nxS+jvBQ18+4GSt3SSN+b5dFTQuAEhV+dYqdKGFFKB7jYHNxRyzR4uph+sgG5 4Go8YlwxyiUzZyZN6I7Z1e69Lzt+JE8OCTtKkx2fiTdAsj8k8yj8y0HMzeMXl1avcsAUo9Lq VLGUlEJMQfiKSNNAdh/pIjvyC3f/1sbJtFXl9BBFmQ34VDKcZyRCZCkNZFovYApGWzSmbRji waR8FJDhcgrsEMMK+s0VzkTYMRENpvI8Qb4qSOMplc2ngxiBIciU/98DA4dzYMcRXUX9weAD Bnnx6p6z2bYbdqOXRKL9RtP5GTsL7F701DTEy9fYxAW990vLvJD/kxtQnnufutDRJynC3yIM Rrw4ZP1AWwkOFmyuu5Ii/zADcVBJ4JrZceiwQ6pcPAaPRcDOkVcVddKgQyBaBH2DZqOkmM5w QnnFBpgaHRcH7RHdJ+6DNdNLacBQ3kRZh2imWVh/J993AClUoNRDmG08e+OFQ7ZXomvO8240 xaaQvm7uhSn8uaVnsWAQrs+e8yolOG+L/P2L9vYqL8iz+k3JquLwpr20eslGMGRAruwIlRtk d6MGlC4Oou52qsAr9cduXuT0rM/v5qMSJXM+r9Aae385ZHADUKq1jpTWXL9vbi3+ujVN/lx4 XUvvh54zHROlbtD70P+RjX207ZK0GF6rWcF9Pk+zjfasmbww8P9nSzj9VLmL/hWQQKRO+ub2 3DQg6tCVq4kJtuPNDHY+MP02Bl9haogBSijePuphG21k2LOQa07Sg4yA/nNjoRQNmaKvElmz auYcwkOQPAK30K3drs2Ompu4At/lz8OT8Lo/dhOAUE7emFHIHSsHyCS1gpuoxdZRA0i7PmJt uAMlsTqBMFOwuvAcYAj2bwl7QQU6yhU= Subject: Re: Samba with multichannel and io_uring Message-ID: <6e7ea4e7-8ef7-9ad4-1377-08749f9bae0b@samba.org> Date: Fri, 16 Oct 2020 13:49:41 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="s7PdufiuUL6MMsXImia5UgmvXF4XBr5UG" Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --s7PdufiuUL6MMsXImia5UgmvXF4XBr5UG Content-Type: multipart/mixed; boundary="zOLDbm4YKcXCQob8eXdY6zjluLfwTxzBk"; protected-headers="v1" From: Stefan Metzmacher To: Jens Axboe , Samba Technical , io-uring Message-ID: <6e7ea4e7-8ef7-9ad4-1377-08749f9bae0b@samba.org> Subject: Re: Samba with multichannel and io_uring References: <53d63041-5931-c5f2-2f31-50b5cbe09ec8@samba.org> In-Reply-To: --zOLDbm4YKcXCQob8eXdY6zjluLfwTxzBk Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Hi Jens, > Thanks for sending this, very interesting! As per this email, I took a > look at the NUMA bindings. If you can, please try this one-liner below.= > I'd be interested to know if that removes the fluctuations you're seein= g > due to bad locality. >=20 > Looks like kthread_create_on_node() doesn't actually do anything (at > least in terms of binding). > >=20 > diff --git a/fs/io-wq.c b/fs/io-wq.c > index 74b84e8562fb..7bebb198b3df 100644 > --- a/fs/io-wq.c > +++ b/fs/io-wq.c > @@ -676,6 +676,7 @@ static bool create_io_worker(struct io_wq *wq, stru= ct io_wqe *wqe, int index) > kfree(worker); > return false; > } > + kthread_bind_mask(worker->task, cpumask_of_node(wqe->node)); > =20 > raw_spin_lock_irq(&wqe->lock); > hlist_nulls_add_head_rcu(&worker->nulls_node, &wqe->free_list); >=20 I no longer have access to that system, but I guess it will help, thanks!= With this: worker->task =3D kthread_create_on_node(io_wqe_worker, worker, wq= e->node, "io_wqe_worker-%d/%d", index, wqe->node);= I see only "io_wqe_worker-0" and "io_wqe_worker-1" in top, without '/0' o= r '/1' at the end, this is because set_task_comm() truncates to 15 characters. As developer I think 'io_wqe' is really confusing, just from reading I th= ought it means "work queue entry", but it's a per numa node worker pool container.= =2E. 'struct io_wq_node *wqn' would be easier to understand for me... Would it make sense to give each io_wq a unique identifier and use names = like this: (fdinfo of the io_uring fd could also include the io_wq id) "io_wq-%u-%u%c", wq->id, wqn->node, index =3D=3D IO_WQ_ACCT_BOUND ? 'B' = : 'U') io_wq-500-M io_wq-500-0B io_wq-500-0B io_wq-500-1B io_wq-500-0U io_wq-200-M io_wq-200-0B io_wq-200-0B io_wq-200-1B io_wq-200-0U I'm not sure how this interacts with workers moving between bound and unb= ound and maybe a worker id might also be useful (or we rely on their pid) I just found that proc_task_name() handles PF_WQ_WORKER special and cat /proc/$pid/comm can expose something like: kworker/u17:2-btrfs-worker-high ps and top still truncate, but that can be fixed. Some workqueues also expose their details under /sys/bus/workqueue/. I guess there's a lot of potential to optimize the details exposed to the= admins and (userspace) developers. metze --zOLDbm4YKcXCQob8eXdY6zjluLfwTxzBk-- --s7PdufiuUL6MMsXImia5UgmvXF4XBr5UG Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEfFbGo3YXpfgryIw9DbX1YShpvVYFAl+JiOMACgkQDbX1YShp vVZHHA//aPDpfw1X6zKkgkICujHSFtRqG8/hsxBTNGe3BUsFUikSrSgpVqAKhpYk iZk4yDeCMQ4DkhtA2ZrhVKx/rAJN/lB1hfpXG/agwbcSjD41TwWp27ocL9bQlQbX zAlVRq2eRMIsL4kqlDb7iDVsiFb7soB3zdYnCjHHocr89+PpaBfgyVvGcjZQw8xt gH0MqNwimblLcsmeRhtgi80+QeH6Ygpqw+bqHTVPqhVr8x6LXtsslsITY/vL1dg7 1WdrtXdVA1wnE77NfuQoSI85Z0ybObQPnMG+10ELJk4PvvHThUt86VSShCGxVulk /H1tg1AU8Ymv0Kknjz1MfR6VobJjX9VnOaBVPizscLx4Xfe3jK9IieoXYbZe2EDh 4iPlKcJSDdOBNskdbm7GzbE1vOW7uQdrGk5aZ8C1tkyYrNWmd0uPK5LtP76IQX09 m7GjFS46ynVqLQLkQysOSD07NeGXDR1vZ42unoNIHd+Hq7nLBxG8w5YGW3rFcMgg DiI7BF+wQJbKE50TWX86yJPIveFW20pBCMti73uIMYnKtIQlTAcoU1iwf6lNseqd dG558AgxEEBwKjXYqnlkYzbpfs7R17lDw1atKs9tGDf4j047N8pzfkBVqTxwoQQ9 35KPFm1Ya1KUXprT8k5Rt8PEyQBaTjs9dxCVYeKXngMBnYeFeqk= =itSY -----END PGP SIGNATURE----- --s7PdufiuUL6MMsXImia5UgmvXF4XBr5UG--