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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

  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 " 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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