linux-kernel - Re: [PATCH RFC] IB/mlx5: Reduce max order of memory allocated for xlt update

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Message-ID: <20210222164834.GL2643399@ziepe.ca>
Date:   Mon, 22 Feb 2021 12:48:34 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Praveen Kannoju <praveen.kannoju@...cle.com>
Cc:     "leon@...nel.org" <leon@...nel.org>,
        "dledford@...hat.com" <dledford@...hat.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Rama Nichanamatlu <rama.nichanamatlu@...cle.com>,
        Rajesh Sivaramasubramaniom 
        <rajesh.sivaramasubramaniom@...cle.com>
Subject: Re: [PATCH RFC] IB/mlx5: Reduce max order of memory allocated for
 xlt update

On Mon, Feb 22, 2021 at 04:26:23PM +0000, Praveen Kannoju wrote:
> Ping!

Your original message didn't make it to the mailing list or
patchworks, you will need to fix your mailing environment and resend
it.

> -	/*
> -	 * If the system already has a suitable high order page then just use
> -	 * that, but don't try hard to create one. This max is about 1M, so a
> -	 * free x86 huge page will satisfy it.
> -	 */
>  	size = min_t(size_t, ent_size * ALIGN(*nents, xlt_chunk_align),
> -		     MLX5_MAX_UMR_CHUNK);
> +		     MLX5_SPARE_UMR_CHUNK);
>  	*nents = size / ent_size;
>  	res = (void *)__get_free_pages(gfp_mask | __GFP_NOWARN,
>  				       get_order(size));

IIRC, there is some GFP flag here that fails fast if the order is not
available, why not just use that?

Jason