From: Jason Gunthorpe <jgg@nvidia.com>
To: Gal Pressman <galpress@amazon.com>
Cc: Leon Romanovsky <leon@kernel.org>,
Doug Ledford <dledford@redhat.com>,
linux-rdma@vger.kernel.org,
Alexander Matushevsky <matua@amazon.com>,
Firas JahJah <firasj@amazon.com>,
Yossi Leybovich <sleybo@amazon.com>
Subject: Re: [PATCH for-next 4/4] RDMA/efa: CQ notifications
Date: Tue, 7 Sep 2021 08:31:35 -0300 [thread overview]
Message-ID: <20210907113135.GE2505917@nvidia.com> (raw)
In-Reply-To: <ed19464f-d046-bc10-ec17-180f7c54ef13@amazon.com>
On Sun, Sep 05, 2021 at 05:36:23PM +0300, Gal Pressman wrote:
> > I can't say if it is needed or not, just wanted to understand why you need
> > complexity in destroy_cq path.
>
> Well, as I said, I don't think the restrack protection is enough in this case as
> it isn't aware of the concurrent eq flow.
>
> I guess I can put a synchronize_irq() on destroy_cq flow to get rid of the race.
That is a better choice that synchronize_rcu(), IIRC
synchronize_rcu should be avoided compared to all other forms of
synchronization because it can take seconds per call to complete, and
in a reasonable verbs app this means potentially minutes to close the
verbs FD and destroy many CQs.
Jason
next prev parent reply other threads:[~2021-09-07 11:31 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-11 15:11 [PATCH for-next 0/4] EFA CQ notifications Gal Pressman
2021-08-11 15:11 ` [PATCH for-next 1/4] RDMA/efa: Free IRQ vectors on error flow Gal Pressman
2021-08-20 18:34 ` Jason Gunthorpe
2021-08-11 15:11 ` [PATCH for-next 2/4] RDMA/efa: Remove unused cpu field from irq struct Gal Pressman
2021-08-11 15:11 ` [PATCH for-next 3/4] RDMA/efa: Rename vector field in efa_irq struct to irqn Gal Pressman
2021-08-11 15:11 ` [PATCH for-next 4/4] RDMA/efa: CQ notifications Gal Pressman
2021-08-20 18:27 ` Jason Gunthorpe
2021-09-01 11:50 ` Gal Pressman
2021-09-01 11:57 ` Jason Gunthorpe
2021-09-01 14:24 ` Gal Pressman
2021-09-01 15:36 ` Jason Gunthorpe
2021-09-02 7:03 ` Gal Pressman
2021-09-02 13:02 ` Jason Gunthorpe
2021-09-02 15:09 ` Gal Pressman
2021-09-02 15:10 ` Jason Gunthorpe
2021-09-02 15:17 ` Gal Pressman
2021-09-02 15:41 ` Jason Gunthorpe
2021-09-05 7:25 ` Gal Pressman
2021-09-05 7:59 ` Leon Romanovsky
2021-09-05 10:45 ` Gal Pressman
2021-09-05 10:54 ` Leon Romanovsky
2021-09-05 11:05 ` Gal Pressman
2021-09-05 13:14 ` Leon Romanovsky
2021-09-05 14:36 ` Gal Pressman
2021-09-07 11:31 ` Jason Gunthorpe [this message]
2021-09-09 11:00 ` Gal Pressman
2021-08-20 18:36 ` [PATCH for-next 0/4] EFA " Jason Gunthorpe
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