From: Jason Gunthorpe <firstname.lastname@example.org> To: Gal Pressman <email@example.com> Cc: Leon Romanovsky <firstname.lastname@example.org>, Doug Ledford <email@example.com>, firstname.lastname@example.org, Alexander Matushevsky <email@example.com>, Firas JahJah <firstname.lastname@example.org>, Yossi Leybovich <email@example.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: <firstname.lastname@example.org> 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 " 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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