All of lore.kernel.org
 help / color / mirror / Atom feed
From: David Hildenbrand <david@redhat.com>
To: Dave Hansen <dave.hansen@intel.com>,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>,
	Sean Christopherson <seanjc@google.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Joerg Roedel <jroedel@suse.de>, Ard Biesheuvel <ardb@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>,
	Kuppuswamy Sathyanarayanan
	<sathyanarayanan.kuppuswamy@linux.intel.com>,
	David Rientjes <rientjes@google.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Peter Zijlstra <peterz@infradead.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Ingo Molnar <mingo@redhat.com>,
	Varad Gautam <varad.gautam@suse.com>,
	Dario Faggioli <dfaggioli@suse.com>,
	x86@kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev,
	linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCHv2 1/7] mm: Add support for unaccepted memory
Date: Wed, 12 Jan 2022 12:31:10 +0100	[thread overview]
Message-ID: <d84e242f-f7f6-4fb0-8f22-bcc790a296a0@redhat.com> (raw)
In-Reply-To: <3a68fabd-eaff-2164-5609-3a71fd4a7257@intel.com>


> 
> Looking at stuff like this, I can't help but think that a:
> 
> 	#define PageOffline PageUnaccepted
> 
> and some other renaming would be a fine idea.  I get that the Offline 
> bit can be reused, but I'm not sure that the "Offline" *naming* should 
> be reused.  What you're doing here is logically distinct from existing 
> offlining.

Yes, or using a new pagetype bit to make the distinction clearer.
Especially the function names like maybe_set_page_offline() et. Al are
confusing IMHO. They are all about accepting unaccepted memory ... and
should express that.

I assume PageOffline() will be set only on the first sub-page of a
high-order PageBuddy() page, correct?

Then we'll have to monitor all PageOffline() users such that they can
actually deal with PageBuddy() pages spanning *multiple* base pages for
a PageBuddy() page. For now it's clear that if a page is PageOffline(),
it cannot be PageBuddy() and cannot span more than one base page.

E.g., fs/proc/kcore.c:read_kcore() assumes that PageOffline() is set on
individual base pages.

-- 
Thanks,

David / dhildenb


  reply	other threads:[~2022-01-12 11:31 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-11 11:33 [PATCHv2 0/7] Implement support for unaccepted memory Kirill A. Shutemov
2022-01-11 11:33 ` [PATCHv2 1/7] mm: Add " Kirill A. Shutemov
2022-01-11 19:46   ` Dave Hansen
2022-01-12 11:31     ` David Hildenbrand [this message]
2022-01-12 19:15       ` Kirill A. Shutemov
2022-01-14 13:22         ` David Hildenbrand
2022-01-12 18:30     ` Kirill A. Shutemov
2022-01-12 18:40       ` Dave Hansen
2022-01-13  7:42         ` Mike Rapoport
2022-01-11 11:33 ` [PATCHv2 2/7] efi/x86: Get full memory map in allocate_e820() Kirill A. Shutemov
2022-01-11 11:33 ` [PATCHv2 3/7] efi/x86: Implement support for unaccepted memory Kirill A. Shutemov
2022-01-11 17:17   ` Dave Hansen
2022-01-12 19:29     ` Kirill A. Shutemov
2022-01-12 19:35       ` Dave Hansen
2022-01-11 11:33 ` [PATCHv2 4/7] x86/boot/compressed: Handle " Kirill A. Shutemov
2022-01-11 11:33 ` [PATCHv2 5/7] x86/mm: Reserve unaccepted memory bitmap Kirill A. Shutemov
2022-01-11 19:10   ` Dave Hansen
2022-01-12 19:43     ` Kirill A. Shutemov
2022-01-12 19:53       ` Dave Hansen
2022-01-15 18:46         ` Mike Rapoport
2022-01-11 11:33 ` [PATCHv2 6/7] x86/mm: Provide helpers for unaccepted memory Kirill A. Shutemov
2022-01-11 20:01   ` Dave Hansen
2022-01-12 19:43     ` Kirill A. Shutemov
2022-01-11 11:33 ` [PATCHv2 7/7] x86/tdx: Unaccepted memory support Kirill A. Shutemov
2022-01-18 21:05 ` [PATCHv2 0/7] Implement support for unaccepted memory Brijesh Singh

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=d84e242f-f7f6-4fb0-8f22-bcc790a296a0@redhat.com \
    --to=david@redhat.com \
    --cc=ak@linux.intel.com \
    --cc=akpm@linux-foundation.org \
    --cc=ardb@kernel.org \
    --cc=bp@alien8.de \
    --cc=dave.hansen@intel.com \
    --cc=dfaggioli@suse.com \
    --cc=jroedel@suse.de \
    --cc=kirill.shutemov@linux.intel.com \
    --cc=linux-coco@lists.linux.dev \
    --cc=linux-efi@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=luto@kernel.org \
    --cc=mingo@redhat.com \
    --cc=pbonzini@redhat.com \
    --cc=peterz@infradead.org \
    --cc=rientjes@google.com \
    --cc=sathyanarayanan.kuppuswamy@linux.intel.com \
    --cc=seanjc@google.com \
    --cc=tglx@linutronix.de \
    --cc=thomas.lendacky@amd.com \
    --cc=varad.gautam@suse.com \
    --cc=vbabka@suse.cz \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.