linux-kernel - Re: [PATCH v1 6/8] vmw_balloon: mark inflated pages PG

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Date:   Wed, 21 Nov 2018 09:54:29 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Nadav Amit <namit@...are.com>
Cc:     linux-mm <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        xen-devel <xen-devel@...ts.xenproject.org>,
        kexec-ml <kexec@...ts.infradead.org>,
        pv-drivers <pv-drivers@...are.com>,
        Xavier Deguillard <xdeguillard@...are.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Julien Freche <jfreche@...are.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...e.com>,
        "Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH v1 6/8] vmw_balloon: mark inflated pages PG_offline

On 21.11.18 04:22, Nadav Amit wrote:
> Thanks for this patch!
> 
>> On Nov 19, 2018, at 2:16 AM, David Hildenbrand <david@...hat.com> wrote:
>>
>> Mark inflated and never onlined pages PG_offline, to tell the world that
>> the content is stale and should not be dumped.
>>
>> Cc: Xavier Deguillard <xdeguillard@...are.com>
>> Cc: Nadav Amit <namit@...are.com>
>> Cc: Arnd Bergmann <arnd@...db.de>
>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>> Cc: Julien Freche <jfreche@...are.com>
>> Cc: Andrew Morton <akpm@...ux-foundation.org>
>> Cc: Matthew Wilcox <willy@...radead.org>
>> Cc: Michal Hocko <mhocko@...e.com>
>> Cc: "Michael S. Tsirkin" <mst@...hat.com>
>> Signed-off-by: David Hildenbrand <david@...hat.com>
>> ---
>> drivers/misc/vmw_balloon.c | 32 ++++++++++++++++++++++++++++++++
>> 1 file changed, 32 insertions(+)
>>
>> diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c
>> index e6126a4b95d3..8cc8bd9a4e32 100644
>> --- a/drivers/misc/vmw_balloon.c
>> +++ b/drivers/misc/vmw_balloon.c
>> @@ -544,6 +544,36 @@ unsigned int vmballoon_page_order(enum vmballoon_page_size_type page_size)
>> 	return page_size == VMW_BALLOON_2M_PAGE ? VMW_BALLOON_2M_ORDER : 0;
>> }
>>
>> +/**
>> + * vmballoon_mark_page_offline() - mark a page as offline
>> + * @page: pointer for the page
> 
> If possible, please add a period at the end of the sentence (yes, I know I
> got it wrong in some places too).

Sure :)

> 
>> + * @page_size: the size of the page.
>> + */
>> +static void
>> +vmballoon_mark_page_offline(struct page *page,
>> +			    enum vmballoon_page_size_type page_size)
>> +{
>> +	int i;
>> +
>> +	for (i = 0; i < 1ULL << vmballoon_page_order(page_size); i++)
> 
> Can you please do instead:
> 
> 	unsigned int;
> 
> 	for (i = 0; i < vmballoon_page_in_frames(page_size); i++)
> 

Will do, will have to move both functions a little bit down in the file
(exactly one function).


> We would like to test it in the next few days, but in the meanwhile, after
> you address these minor issues:
> 
> Acked-by: Nadav Amit <namit@...are.com>

Thanks!

> 
> Thanks again,
> Nadav 
> 


-- 

Thanks,

David / dhildenb