Displaying 4 results from an estimated 4 matches for "memmap_init_zon".
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memmap_init_zone
2019 Oct 16
1
[PATCH RFC v3 6/9] mm: Allow to offline PageOffline() pages with a reference count of 0
...ins garbage or not. You have
> to assume it is garbage. (my recent patch even poisons the memmap when
> offlining, which helped to find a lot of these "garbage memmap" BUGs)
>
> online_pages()
> ...
> move_pfn_range_to_zone(zone, pfn, nr_pages, NULL);
> ...
> memmap_init_zone()
> -> memmap initialized
>
> So yes, offlining memory with HWPoison and re-onlining it effectively drops
> HWPoison markers. On the next access, you will trigger a new HWPoison.
Right you are! I need to sit on this much more and think about it with a
clean head.
--
Michal Hoc...
2019 Oct 16
3
[PATCH RFC v3 6/9] mm: Allow to offline PageOffline() pages with a reference count of 0
On Wed 16-10-19 14:50:30, David Hildenbrand wrote:
> On 16.10.19 13:43, Michal Hocko wrote:
> > On Thu 19-09-19 16:22:25, David Hildenbrand wrote:
> > > virtio-mem wants to allow to offline memory blocks of which some parts
> > > were unplugged, especially, to later offline and remove completely
> > > unplugged memory blocks. The important part is that
2019 Oct 16
3
[PATCH RFC v3 6/9] mm: Allow to offline PageOffline() pages with a reference count of 0
On Wed 16-10-19 14:50:30, David Hildenbrand wrote:
> On 16.10.19 13:43, Michal Hocko wrote:
> > On Thu 19-09-19 16:22:25, David Hildenbrand wrote:
> > > virtio-mem wants to allow to offline memory blocks of which some parts
> > > were unplugged, especially, to later offline and remove completely
> > > unplugged memory blocks. The important part is that
2019 Oct 16
0
[PATCH RFC v3 6/9] mm: Allow to offline PageOffline() pages with a reference count of 0
...here is no way you could tell it contains garbage or not. You
have to assume it is garbage. (my recent patch even poisons the memmap
when offlining, which helped to find a lot of these "garbage memmap" BUGs)
online_pages()
...
move_pfn_range_to_zone(zone, pfn, nr_pages, NULL);
...
memmap_init_zone()
-> memmap initialized
So yes, offlining memory with HWPoison and re-onlining it effectively
drops HWPoison markers. On the next access, you will trigger a new HWPoison.
>
>> The driver that marked these pages to be skipped when offlining is
>> responsible for registering...