On 10/04/2017 10:04 AM, Michal Hocko wrote:
On Wed 04-10-17 09:28:55, Pasha Tatashin wrote:
I am not really familiar with the trim_low_memory_range code path. I am
not even sure we have to care about it because nobody should be walking
pfns outside of any zone.
According to commit comments
On Wed 04-10-17 09:28:55, Pasha Tatashin wrote:
>
> > I am not really familiar with the trim_low_memory_range code path. I am
> > not even sure we have to care about it because nobody should be walking
> > pfns outside of any zone.
>
> According to commit comments first 4K belongs to BIOS, so I t
I am not really familiar with the trim_low_memory_range code path. I am
not even sure we have to care about it because nobody should be walking
pfns outside of any zone.
According to commit comments first 4K belongs to BIOS, so I think the
memory exists but BIOS may or may not report it to Li
On Wed 04-10-17 08:40:11, Pasha Tatashin wrote:
> > > > Could you be more specific where is such a memory reserved?
> > > >
> > >
> > > I know of one example: trim_low_memory_range() unconditionally reserves
> > > from
> > > pfn 0, but e820__memblock_setup() might provide the exiting memory from
Could you be more specific where is such a memory reserved?
I know of one example: trim_low_memory_range() unconditionally reserves from
pfn 0, but e820__memblock_setup() might provide the exiting memory from pfn
1 (i.e. KVM).
Then just initialize struct pages for that mapping rigth there whe
On Tue 03-10-17 11:29:16, Pasha Tatashin wrote:
> On 10/03/2017 09:18 AM, Michal Hocko wrote:
> > On Wed 20-09-17 16:17:10, Pavel Tatashin wrote:
> > > Some memory is reserved but unavailable: not present in memblock.memory
> > > (because not backed by physical pages), but present in memblock.reser
On 10/03/2017 09:18 AM, Michal Hocko wrote:
On Wed 20-09-17 16:17:10, Pavel Tatashin wrote:
Some memory is reserved but unavailable: not present in memblock.memory
(because not backed by physical pages), but present in memblock.reserved.
Such memory has backing struct pages, but they are not ini
On Wed 20-09-17 16:17:10, Pavel Tatashin wrote:
> Some memory is reserved but unavailable: not present in memblock.memory
> (because not backed by physical pages), but present in memblock.reserved.
> Such memory has backing struct pages, but they are not initialized by going
> through __init_single
Some memory is reserved but unavailable: not present in memblock.memory
(because not backed by physical pages), but present in memblock.reserved.
Such memory has backing struct pages, but they are not initialized by going
through __init_single_page().
In some cases these struct pages are accessed
