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From: Nitesh Narayan Lal <nitesh@redhat.com>
To: David Hildenbrand <david@redhat.com>,
	Alexander Duyck <alexander.duyck@gmail.com>
Cc: kvm list <kvm@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-mm <linux-mm@kvack.org>,
	virtio-dev@lists.oasis-open.org,
	Paolo Bonzini <pbonzini@redhat.com>,
	lcapitulino@redhat.com, pagupta@redhat.com, wei.w.wang@intel.com,
	Yang Zhang <yang.zhang.wz@gmail.com>,
	Rik van Riel <riel@surriel.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	dodgen@google.com, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	dhildenb@redhat.com, Andrea Arcangeli <aarcange@redhat.com>,
	john.starks@microsoft.com, Dave Hansen <dave.hansen@intel.com>,
	Michal Hocko <mhocko@suse.com>,
	cohuck@redhat.com
Subject: Re: [RFC][Patch v12 1/2] mm: page_reporting: core infrastructure
Date: Tue, 13 Aug 2019 06:42:41 -0400
Message-ID: <53fb1343-3b18-a566-aaa5-90a1d99d7333@redhat.com> (raw)
In-Reply-To: <32f61f87-6205-5001-866c-a84e20fc9d85@redhat.com>


On 8/13/19 6:34 AM, David Hildenbrand wrote:
>>>>> +static int process_free_page(struct page *page,
>>>>> +                            struct page_reporting_config *phconf, int count)
>>>>> +{
>>>>> +       int mt, order, ret = 0;
[...]
>>>>> +/**
>>>>> + * zone_reporting_init - For each zone initializes the page reporting fields
>>>>> + * and allocates the respective bitmap.
>>>>> + *
>>>>> + * This function returns 0 on successful initialization, -ENOMEM otherwise.
>>>>> + */
>>>>> +static int zone_reporting_init(void)
>>>>> +{
>>>>> +       struct zone *zone;
>>>>> +       int ret;
>>>>> +
>>>>> +       for_each_populated_zone(zone) {
>>>>> +#ifdef CONFIG_ZONE_DEVICE
>>>>> +               /* we can not report pages which are not in the buddy */
>>>>> +               if (zone_idx(zone) == ZONE_DEVICE)
>>>>> +                       continue;
>>>>> +#endif
>>>> I'm pretty sure this isn't needed since I don't think the ZONE_DEVICE
>>>> zone will be considered "populated".
>>>>
>>> I think you are right (although it's confusing, we will have present
>>> sections part of a zone but the zone has no present_pages - screams like
>>> a re factoring - leftover from ZONE_DEVICE introduction).
>>
>> I think in that case it is safe to have this check here.
>> What do you guys suggest?
> If it's not needed, I'd say drop it (eventually add a comment).


Comment to mention that we do not expect a zone with non-buddy page to be
initialized here?

>
>
-- 
Thanks
Nitesh

  reply index

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-12 13:12 [RFC][PATCH v12 0/2] mm: Support for page reporting Nitesh Narayan Lal
2019-08-12 13:12 ` [RFC][Patch v12 1/2] mm: page_reporting: core infrastructure Nitesh Narayan Lal
2019-08-12 18:47   ` Alexander Duyck
2019-08-12 20:04     ` Nitesh Narayan Lal
2019-08-20 14:11       ` Nitesh Narayan Lal
2019-08-12 20:05     ` David Hildenbrand
2019-08-13 10:30       ` Nitesh Narayan Lal
2019-08-13 10:34         ` David Hildenbrand
2019-08-13 10:42           ` Nitesh Narayan Lal [this message]
2019-08-13 10:44             ` David Hildenbrand
2019-08-13 23:14           ` Alexander Duyck
2019-08-14  7:07             ` David Hildenbrand
2019-08-14 12:49               ` [virtio-dev] " Nitesh Narayan Lal
2019-08-14 15:49     ` Nitesh Narayan Lal
2019-08-14 16:11       ` Alexander Duyck
2019-08-15 13:15         ` Nitesh Narayan Lal
2019-08-15 19:22           ` Nitesh Narayan Lal
2019-08-15 23:00             ` Alexander Duyck
2019-08-16 18:35               ` Nitesh Narayan Lal
2019-08-30 15:15     ` Nitesh Narayan Lal
2019-08-30 15:31       ` Alexander Duyck
2019-08-30 16:05         ` Nitesh Narayan Lal
2019-09-04  8:40           ` [virtio-dev] " David Hildenbrand
2019-10-10 20:36   ` Alexander Duyck
2019-10-11 11:02     ` Nitesh Narayan Lal
2019-08-12 13:12 ` [RFC][Patch v12 2/2] virtio-balloon: interface to support free page reporting Nitesh Narayan Lal
2019-08-14 10:29   ` Cornelia Huck
2019-08-14 11:47     ` Nitesh Narayan Lal
2019-08-14 13:42       ` Cornelia Huck
2019-08-14 14:01         ` Nitesh Narayan Lal
2019-08-12 13:13 ` [QEMU Patch 1/2] virtio-balloon: adding bit for page reporting support Nitesh Narayan Lal
2019-08-12 13:13   ` [QEMU Patch 2/2] virtio-balloon: support for handling page reporting Nitesh Narayan Lal
2019-08-12 15:18     ` Alexander Duyck
2019-08-12 15:26       ` Nitesh Narayan Lal
2019-09-11 12:30 ` [RFC][PATCH v12 0/2] mm: Support for " David Hildenbrand

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