linux-kernel - Re: [Xen-devel] [PATCH] xen/gntdev: Don't allocate struct gntdev_copy

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Message-ID: <569CC84A.1000401@citrix.com>
Date:	Mon, 18 Jan 2016 11:11:06 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	<konrad.wilk@...cle.com>, <david.vrabel@...rix.com>
CC:	<xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH] xen/gntdev: Don't allocate struct gntdev_copy_batch
 on stack

On 15/01/16 19:43, Boris Ostrovsky wrote:
> struct gntdev_copy_batch is over 1300 bytes in size, we shouldn't
> put it on stack.
> 
> Some compilers (e.g. 5.2.1) complain:
>  drivers/xen/gntdev.c: In function ‘gntdev_ioctl_grant_copy.isra.5’:
>  drivers/xen/gntdev.c:949:1: warning: the frame size of 1416 bytes
>   is larger than 1024 bytes [-Wframe-larger-than=]

I thought I'd already reduced the size of this enough (from a batch size
of 32 to 24) but this obviously isn't enough for 64-bit platforms.

In the absence of any performance data on the best approach I would
prefer just reducing the batch size to 16.

David