linux-kernel - Re: [PATCH v1 1/3] mm: pass meminit_context to __free_pages

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZmbnxrOuoarMbC6X@localhost.localdomain>
Date: Mon, 10 Jun 2024 13:47:18 +0200
From: Oscar Salvador <osalvador@...e.de>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-hyperv@...r.kernel.org, virtualization@...ts.linux.dev,
	xen-devel@...ts.xenproject.org, kasan-dev@...glegroups.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Rapoport <rppt@...nel.org>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	Juergen Gross <jgross@...e.com>,
	Stefano Stabellini <sstabellini@...nel.org>,
	Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
	Alexander Potapenko <glider@...gle.com>,
	Marco Elver <elver@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH v1 1/3] mm: pass meminit_context to __free_pages_core()

On Mon, Jun 10, 2024 at 10:38:05AM +0200, David Hildenbrand wrote:
> On 10.06.24 06:03, Oscar Salvador wrote:
> > On Fri, Jun 07, 2024 at 11:09:36AM +0200, David Hildenbrand wrote:
> > > In preparation for further changes, let's teach __free_pages_core()
> > > about the differences of memory hotplug handling.
> > > 
> > > Move the memory hotplug specific handling from generic_online_page() to
> > > __free_pages_core(), use adjust_managed_page_count() on the memory
> > > hotplug path, and spell out why memory freed via memblock
> > > cannot currently use adjust_managed_page_count().
> > > 
> > > Signed-off-by: David Hildenbrand <david@...hat.com>
> > 
> > All looks good but I am puzzled with something.
> > 
> > > +	} else {
> > > +		/* memblock adjusts totalram_pages() ahead of time. */
> > > +		atomic_long_add(nr_pages, &page_zone(page)->managed_pages);
> > > +	}
> > 
> > You say that memblock adjusts totalram_pages ahead of time, and I guess
> > you mean in memblock_free_all()
> 
> And memblock_free_late(), which uses atomic_long_inc().

Ah yes.

 
> Right (it's suboptimal, but not really problematic so far. Hopefully Wei can
> clean it up and move it in here as well)

That would be great.

> For the time being
> 
> "/* memblock adjusts totalram_pages() manually. */"

Yes, I think that is better ;-)

Thanks!
 

-- 
Oscar Salvador
SUSE Labs