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Re: [PATCH v5 01/13] xen/common: add cache coloring common code
- To: Carlo Nonato <carlo.nonato@xxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 11 Jan 2024 11:16:46 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Marco Solieri <marco.solieri@xxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 11 Jan 2024 10:16:56 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.01.2024 11:10, Carlo Nonato wrote:
> On Mon, Jan 8, 2024 at 5:53 PM Jan Beulich <jbeulich@xxxxxxxx> wrote:
>> On 02.01.2024 10:51, Carlo Nonato wrote:
>>> --- a/xen/include/xen/sched.h
>>> +++ b/xen/include/xen/sched.h
>>> @@ -626,6 +626,11 @@ struct domain
>>>
>>> /* Holding CDF_* constant. Internal flags for domain creation. */
>>> unsigned int cdf;
>>> +
>>> +#ifdef CONFIG_LLC_COLORING
>>> + unsigned int *llc_colors;
>>
>> Can the color values change over the lifetime of a domain? If not,
>> it may be prudent to have this be pointer-to-const.
>
> Can I free a pointer-to-const array?
Well, you certainly can by using a cast. Avoiding the need for such call-
site casts is why I've been advocating to make xfree() / vfree() match e.g.
vunmap() / _vfree() in this regard. Yet other opinions are that the const
there ought to be dropped (without me really following the reasoning) ...
There's also the option of circumventing the need for a cast by doing
xfree(__va(__pa(ptr)));
Jan
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