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Message-ID: <ZmZ7GgwJw4ucPJaM@localhost.localdomain>
Date: Mon, 10 Jun 2024 06:03:38 +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 PĂ©rez <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 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()
pages = free_low_memory_core_early()
totalram_pages_add(pages);
but that is not ahead, it looks like it is upading __after__ sending
them to buddy?
--
Oscar Salvador
SUSE Labs
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