From: Jinpu Wang <jinpu.wang@cloud.ionos.com>
To: Bart Van Assche <bvanassche@acm.org>
Cc: Jack Wang <jinpuwang@gmail.com>,
linux-block@vger.kernel.org, linux-rdma@vger.kernel.org,
Jens Axboe <axboe@kernel.dk>,
Christoph Hellwig <hch@infradead.org>,
Sagi Grimberg <sagi@grimberg.me>,
Leon Romanovsky <leon@kernel.org>,
Doug Ledford <dledford@redhat.com>,
Jason Gunthorpe <jgg@ziepe.ca>,
Danil Kipnis <danil.kipnis@cloud.ionos.com>,
Roman Penyaev <rpenyaev@suse.de>,
Pankaj Gupta <pankaj.gupta@cloud.ionos.com>
Subject: Re: [PATCH v9 17/25] block/rnbd: client: main functionality
Date: Mon, 2 Mar 2020 15:58:42 +0100 [thread overview]
Message-ID: <CAMGffEnrX0+ktLPOocEt6kOYJ93F1yOYYCwrvnZQuWVCQG3qRQ@mail.gmail.com> (raw)
In-Reply-To: <16e946dd-b244-594b-937e-689f2f23614e@acm.org>
On Sun, Mar 1, 2020 at 3:46 AM Bart Van Assche <bvanassche@acm.org> wrote:
>
> On 2020-02-21 02:47, Jack Wang wrote:
> > +/**
> > + * rnbd_get_cpu_qlist() - finds a list with HW queues to be rerun
> > + * @sess: Session to find a queue for
> > + * @cpu: Cpu to start the search from
> > + *
> > + * Description:
> > + * Each CPU has a list of HW queues, which needs to be rerun. If a list
> > + * is not empty - it is marked with a bit. This function finds first
> > + * set bit in a bitmap and returns corresponding CPU list.
> > + */
> > +static struct rnbd_cpu_qlist *
> > +rnbd_get_cpu_qlist(struct rnbd_clt_session *sess, int cpu)
> > +{
> > + int bit;
> > +
> > + /* First half */
> > + bit = find_next_bit(sess->cpu_queues_bm, nr_cpu_ids, cpu);
> > + if (bit < nr_cpu_ids) {
> > + return per_cpu_ptr(sess->cpu_queues, bit);
> > + } else if (cpu != 0) {
> > + /* Second half */
> > + bit = find_next_bit(sess->cpu_queues_bm, cpu, 0);
> > + if (bit < cpu)
> > + return per_cpu_ptr(sess->cpu_queues, bit);
> > + }
> > +
> > + return NULL;
> > +}
>
> Please make the "first half" and "second half" comments unambiguous. To
> me it seems like the code under "first half" searches through the second
> half of the bitmap and that the code under "second half" searches
> through the first half of the bitmap.
Ok, will improve the comments, say searching "cpu to nr_cpu_ids" and "0 to cpu"
>
> > + /**
> > + * That is simple percpu variable which stores cpu indeces, which are
> > + * incremented on each access. We need that for the sake of fairness
> > + * to wake up queues in a round-robin manner.
> > + */
>
> Please start block comments with "/*".
ok
>
> > +static void wait_for_rtrs_disconnection(struct rnbd_clt_session *sess)
> > + __releases(&sess_lock)
> > + __acquires(&sess_lock)
> > +{
> > + DEFINE_WAIT_FUNC(wait, autoremove_wake_function);
>
> Please use DEFINE_WAIT() instead of open-coding it.
ok
>
> Thanks,
>
> Bart.
Thanks!
next prev parent reply other threads:[~2020-03-02 14:58 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-21 10:46 [PATCH v9 00/25] RTRS (former IBTRS) RDMA Transport Library and RNBD (former IBNBD) RDMA Network Block Device Jack Wang
2020-02-21 10:46 ` [PATCH v9 01/25] sysfs: export sysfs_remove_file_self() Jack Wang
2020-03-01 0:24 ` Bart Van Assche
2020-03-02 14:37 ` Jinpu Wang
2020-02-21 10:46 ` [PATCH v9 02/25] RDMA/rtrs: public interface header to establish RDMA connections Jack Wang
2020-03-01 0:31 ` Bart Van Assche
2020-03-02 8:39 ` Jinpu Wang
2020-03-03 9:40 ` Leon Romanovsky
2020-03-03 14:05 ` Jinpu Wang
2020-03-03 14:16 ` Leon Romanovsky
2020-03-03 14:23 ` Jinpu Wang
2020-02-21 10:46 ` [PATCH v9 03/25] RDMA/rtrs: private headers with rtrs protocol structs and helpers Jack Wang
2020-03-01 0:37 ` Bart Van Assche
2020-03-02 9:21 ` Jinpu Wang
2020-03-03 9:45 ` Leon Romanovsky
2020-03-03 13:52 ` Jinpu Wang
2020-03-03 14:05 ` Jason Gunthorpe
2020-03-03 16:13 ` Jinpu Wang
2020-02-21 10:47 ` [PATCH v9 04/25] RDMA/rtrs: core: lib functions shared between client and server modules Jack Wang
2020-03-01 0:47 ` Bart Van Assche
2020-03-02 8:40 ` Jinpu Wang
2020-03-03 9:57 ` Leon Romanovsky
2020-03-04 11:21 ` Jinpu Wang
2020-02-21 10:47 ` [PATCH v9 05/25] RDMA/rtrs: client: private header with client structs and functions Jack Wang
2020-03-01 0:51 ` Bart Van Assche
2020-03-02 13:49 ` Jinpu Wang
2020-03-02 16:13 ` Bart Van Assche
2020-03-02 16:18 ` Jinpu Wang
2020-02-21 10:47 ` [PATCH v9 06/25] RDMA/rtrs: client: main functionality Jack Wang
2020-03-01 1:33 ` Bart Van Assche
2020-03-02 13:20 ` Danil Kipnis
2020-03-03 16:04 ` Bart Van Assche
2020-03-04 16:43 ` Jinpu Wang
2020-03-04 16:49 ` Jason Gunthorpe
2020-03-05 11:26 ` Jinpu Wang
2020-03-05 13:27 ` Jason Gunthorpe
2020-03-05 13:37 ` Jinpu Wang
2020-03-05 13:54 ` Jason Gunthorpe
2020-03-06 13:33 ` Jinpu Wang
2020-02-21 10:47 ` [PATCH v9 07/25] RDMA/rtrs: client: statistics functions Jack Wang
2020-03-03 11:28 ` Leon Romanovsky
2020-03-03 11:46 ` Jinpu Wang
2020-02-21 10:47 ` [PATCH v9 08/25] RDMA/rtrs: client: sysfs interface functions Jack Wang
2020-02-21 10:47 ` [PATCH v9 09/25] RDMA/rtrs: server: private header with server structs and functions Jack Wang
2020-02-21 10:47 ` [PATCH v9 10/25] RDMA/rtrs: server: main functionality Jack Wang
2020-03-01 1:42 ` Bart Van Assche
2020-03-02 14:39 ` Jinpu Wang
2020-03-03 11:37 ` Leon Romanovsky
2020-03-03 16:41 ` Jinpu Wang
2020-03-03 16:59 ` Leon Romanovsky
2020-03-04 11:03 ` Jinpu Wang
2020-03-05 8:00 ` Leon Romanovsky
[not found] ` <CAHg0Huyc=pn1=WSKGLjm+c8AcchyQ8q7JS-0ToQyiBRgpGG=jA@mail.gmail.com>
2020-03-05 12:16 ` Leon Romanovsky
2020-03-05 12:28 ` Jinpu Wang
2020-03-05 12:35 ` Leon Romanovsky
2020-03-05 13:02 ` Jinpu Wang
2020-02-21 10:47 ` [PATCH v9 11/25] RDMA/rtrs: server: statistics functions Jack Wang
2020-02-21 10:47 ` [PATCH v9 12/25] RDMA/rtrs: server: sysfs interface functions Jack Wang
2020-02-21 10:47 ` [PATCH v9 13/25] RDMA/rtrs: include client and server modules into kernel compilation Jack Wang
2020-02-21 10:47 ` [PATCH v9 14/25] RDMA/rtrs: a bit of documentation Jack Wang
2020-02-21 10:47 ` [PATCH v9 15/25] block/rnbd: private headers with rnbd protocol structs and helpers Jack Wang
2020-03-01 2:12 ` Bart Van Assche
2020-03-02 16:37 ` Jinpu Wang
2020-02-21 10:47 ` [PATCH v9 16/25] block/rnbd: client: private header with client structs and functions Jack Wang
2020-03-01 2:26 ` Bart Van Assche
2020-03-02 14:59 ` Jinpu Wang
2020-02-21 10:47 ` [PATCH v9 17/25] block/rnbd: client: main functionality Jack Wang
2020-03-01 2:46 ` Bart Van Assche
2020-03-02 14:58 ` Jinpu Wang [this message]
2020-02-21 10:47 ` [PATCH v9 18/25] block/rnbd: client: sysfs interface functions Jack Wang
2020-02-21 10:47 ` [PATCH v9 19/25] block/rnbd: server: private header with server structs and functions Jack Wang
2020-03-01 2:47 ` Bart Van Assche
2020-03-02 10:07 ` Danil Kipnis
2020-02-21 10:47 ` [PATCH v9 20/25] block/rnbd: server: main functionality Jack Wang
2020-03-01 2:58 ` Bart Van Assche
2020-03-02 9:58 ` Danil Kipnis
2020-03-03 5:57 ` Bart Van Assche
2020-02-21 10:47 ` [PATCH v9 21/25] block/rnbd: server: functionality for IO submission to file or block dev Jack Wang
2020-03-01 3:09 ` Bart Van Assche
2020-03-02 10:06 ` Danil Kipnis
2020-03-03 16:20 ` Jinpu Wang
2020-03-03 16:28 ` Bart Van Assche
2020-03-03 16:43 ` Jinpu Wang
2020-02-21 10:47 ` [PATCH v9 22/25] block/rnbd: server: sysfs interface functions Jack Wang
2020-02-21 10:47 ` [PATCH v9 23/25] block/rnbd: include client and server modules into kernel compilation Jack Wang
2020-02-21 10:47 ` [PATCH v9 24/25] block/rnbd: a bit of documentation Jack Wang
2020-02-21 10:47 ` [PATCH v9 25/25] MAINTAINERS: Add maintainers for RNBD/RTRS modules Jack Wang
2020-03-03 9:28 ` [PATCH v9 00/25] RTRS (former IBTRS) RDMA Transport Library and RNBD (former IBNBD) RDMA Network Block Device Leon Romanovsky
2020-03-04 14:06 ` Jinpu Wang
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