linux-kernel - Re: [PATCH rdma-next v1 1/7] RDMA/mlx5: Merge similar flows of allocating MR from the cache

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Date:   Fri, 7 Jan 2022 16:07:01 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Aharon Landau <aharonl@...dia.com>, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org
Subject: Re: [PATCH rdma-next v1 1/7] RDMA/mlx5: Merge similar flows of
 allocating MR from the cache

On Thu, Dec 30, 2021 at 01:23:18PM +0200, Leon Romanovsky wrote:

>  	if (list_empty(&ent->head)) {
> +		if (ent->limit) {
> +			queue_adjust_cache_locked(ent);
> +			ent->miss++;
> +		}

I don't this this addition of ent->limit makes any sense.

The only case it triggers is the two ODP callers and they should
definately increment miss.

queue_adjust_cache_locked() is an effective NOP if limit is zero as
available_mrs should be zero too.

Jason