[PATCH v9 00/12] complete deferred page initialization · Pavel Tatashin <hidden> · 2017-09-20
[PATCH v9 04/12] sparc64: simplify vmemmap_populate · Pavel Tatashin <hidden> · 2017-09-20
Re: [PATCH v9 04/12] sparc64: simplify vmemmap_populate · Michal Hocko <mhocko@kernel.org> · 2017-10-03
Re: [PATCH v9 04/12] sparc64: simplify vmemmap_populate · Pasha Tatashin <hidden> · 2017-10-03
[PATCH v9 01/12] x86/mm: setting fields in deferred pages · Pavel Tatashin <hidden> · 2017-09-20
Re: [PATCH v9 01/12] x86/mm: setting fields in deferred pages · Michal Hocko <mhocko@kernel.org> · 2017-10-03
Re: [PATCH v9 01/12] x86/mm: setting fields in deferred pages · Pasha Tatashin <hidden> · 2017-10-03
[PATCH v9 05/12] mm: defining memblock_virt_alloc_try_nid_raw · Pavel Tatashin <hidden> · 2017-09-20
[PATCH v9 12/12] mm: stop zeroing memory during allocation in vmemmap · Pavel Tatashin <hidden> · 2017-09-20
Re: [PATCH v9 12/12] mm: stop zeroing memory during allocation in vmemmap · Michal Hocko <mhocko@kernel.org> · 2017-10-03
Re: [PATCH v9 12/12] mm: stop zeroing memory during allocation in vmemmap · Pasha Tatashin <hidden> · 2017-10-03
Re: [PATCH v9 12/12] mm: stop zeroing memory during allocation in vmemmap · Pasha Tatashin <hidden> · 2017-10-03
Re: [PATCH v9 12/12] mm: stop zeroing memory during allocation in vmemmap · Michal Hocko <mhocko@kernel.org> · 2017-10-04
[PATCH v9 11/12] arm64/kasan: use kasan_map_populate() · Pavel Tatashin <hidden> · 2017-09-20
[PATCH v9 06/12] mm: zero struct pages during initialization · Pavel Tatashin <hidden> · 2017-09-20
Re: [PATCH v9 06/12] mm: zero struct pages during initialization · Michal Hocko <mhocko@kernel.org> · 2017-10-03
Re: [PATCH v9 06/12] mm: zero struct pages during initialization · Pasha Tatashin <hidden> · 2017-10-03
Re: [PATCH v9 06/12] mm: zero struct pages during initialization · Michal Hocko <mhocko@kernel.org> · 2017-10-04
Re: [PATCH v9 06/12] mm: zero struct pages during initialization · Pasha Tatashin <hidden> · 2017-10-04
[PATCH v9 08/12] mm: zero reserved and unavailable struct pages · Pavel Tatashin <hidden> · 2017-09-20
Re: [PATCH v9 08/12] mm: zero reserved and unavailable struct pages · Michal Hocko <mhocko@kernel.org> · 2017-10-03
Re: [PATCH v9 08/12] mm: zero reserved and unavailable struct pages · Pasha Tatashin <hidden> · 2017-10-03
Re: [PATCH v9 08/12] mm: zero reserved and unavailable struct pages · Michal Hocko <mhocko@kernel.org> · 2017-10-04
Re: [PATCH v9 08/12] mm: zero reserved and unavailable struct pages · Pasha Tatashin <hidden> · 2017-10-04
Re: [PATCH v9 08/12] mm: zero reserved and unavailable struct pages · Michal Hocko <mhocko@kernel.org> · 2017-10-04
Re: [PATCH v9 08/12] mm: zero reserved and unavailable struct pages · Pasha Tatashin <hidden> · 2017-10-04
Re: [PATCH v9 08/12] mm: zero reserved and unavailable struct pages · Michal Hocko <mhocko@kernel.org> · 2017-10-04
Re: [PATCH v9 08/12] mm: zero reserved and unavailable struct pages · Pasha Tatashin <hidden> · 2017-10-04
[PATCH v9 03/12] mm: deferred_init_memmap improvements · Pavel Tatashin <hidden> · 2017-09-20
Re: [PATCH v9 03/12] mm: deferred_init_memmap improvements · Michal Hocko <mhocko@kernel.org> · 2017-10-03
Re: [PATCH v9 03/12] mm: deferred_init_memmap improvements · Pasha Tatashin <hidden> · 2017-10-03
Re: [PATCH v9 03/12] mm: deferred_init_memmap improvements · Pasha Tatashin <hidden> · 2017-10-03
Re: [PATCH v9 03/12] mm: deferred_init_memmap improvements · Michal Hocko <mhocko@kernel.org> · 2017-10-04
[PATCH v9 10/12] x86/kasan: use kasan_map_populate() · Pavel Tatashin <hidden> · 2017-09-20
[PATCH v9 09/12] mm/kasan: kasan specific map populate function · Pavel Tatashin <hidden> · 2017-09-20
Re: [PATCH v9 09/12] mm/kasan: kasan specific map populate function · Mark Rutland <mark.rutland@arm.com> · 2017-10-03
Re: [PATCH v9 09/12] mm/kasan: kasan specific map populate function · Pasha Tatashin <hidden> · 2017-10-03
Re: [PATCH v9 09/12] mm/kasan: kasan specific map populate function · Will Deacon <hidden> · 2017-10-09
Re: [PATCH v9 09/12] mm/kasan: kasan specific map populate function · Pavel Tatashin <hidden> · 2017-10-09
Re: [PATCH v9 09/12] mm/kasan: kasan specific map populate function · Michal Hocko <mhocko@kernel.org> · 2017-10-09
Re: [PATCH v9 09/12] mm/kasan: kasan specific map populate function · Will Deacon <hidden> · 2017-10-09
Re: [PATCH v9 09/12] mm/kasan: kasan specific map populate function · Will Deacon <hidden> · 2017-10-09
Re: [PATCH v9 09/12] mm/kasan: kasan specific map populate function · Pavel Tatashin <hidden> · 2017-10-09
Re: [PATCH v9 09/12] mm/kasan: kasan specific map populate function · Will Deacon <hidden> · 2017-10-09
Re: [PATCH v9 09/12] mm/kasan: kasan specific map populate function · Pavel Tatashin <hidden> · 2017-10-09
Re: [PATCH v9 09/12] mm/kasan: kasan specific map populate function · Will Deacon <hidden> · 2017-10-09
Re: [PATCH v9 09/12] mm/kasan: kasan specific map populate function · Pavel Tatashin <hidden> · 2017-10-09
Re: [PATCH v9 09/12] mm/kasan: kasan specific map populate function · Pavel Tatashin <hidden> · 2017-10-09
[PATCH v9 07/12] sparc64: optimized struct page zeroing · Pavel Tatashin <hidden> · 2017-09-20
[PATCH v9 02/12] sparc64/mm: setting fields in deferred pages · Pavel Tatashin <hidden> · 2017-09-20
Re: [PATCH v9 02/12] sparc64/mm: setting fields in deferred pages · Michal Hocko <mhocko@kernel.org> · 2017-10-03
Re: [PATCH v9 02/12] sparc64/mm: setting fields in deferred pages · Pasha Tatashin <hidden> · 2017-10-03

Re: [PATCH v9 08/12] mm: zero reserved and unavailable struct pages

From: Pasha Tatashin <hidden>
Date: 2017-10-03 15:30:55
Also in: linux-arm-kernel, linux-mm, lkml, sparclinux

On 10/03/2017 09:18 AM, Michal Hocko wrote:

On Wed 20-09-17 16:17:10, Pavel Tatashin wrote:

quoted

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().

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).

But, there could be more based on this comment from linux/page-flags.h:

 19  * PG_reserved is set for special pages, which can never be swapped out. Some
 20  * of them might not even exist (eg empty_bad_page)...

Pasha

`h`	back out one level
`j`	next message in thread
`k`	previous message in thread
`l`	drill in
`Esc`	close help / fold thread tree
`?`	toggle this help