linux-kernel - RE: [PATCH rdma-next] RDMA/rdmavt: Decouple QP and SGE lists allocations

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Date:   Wed, 12 May 2021 12:23:06 +0000
From:   "Marciniszyn, Mike" <mike.marciniszyn@...nelisnetworks.com>
To:     Leon Romanovsky <leon@...nel.org>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        "Dalessandro, Dennis" <dennis.dalessandro@...nelisnetworks.com>
CC:     Leon Romanovsky <leonro@...dia.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: RE: [PATCH rdma-next] RDMA/rdmavt: Decouple QP and SGE lists
 allocations

> -	struct rvt_sge r_sg_list[] /* verified SGEs */
> +	struct rvt_sge *r_sg_list /* verified SGEs */
>  		____cacheline_aligned_in_smp;
>  };
> 

Since since has been made an independent allocation, r_sg_list becomes a read-mostly pointer and should be moved up in rvt_qp to other 64 bit fields around timeout_jiffies.

The cacheline can then be dropped for this field.

Mike