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Re: [PATCH V3 (resend) 12/19] x86/setup: vmap heap nodes when they are outside the direct map
- To: Elias El Yandouzi <eliasely@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 15 May 2024 17:28:14 +0200
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- Cc: julien@xxxxxxx, pdurrant@xxxxxxxxxx, dwmw@xxxxxxxxxx, Hongyan Xia <hongyxia@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <jgrall@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 15 May 2024 15:28:30 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.05.2024 15:40, Elias El Yandouzi wrote:
> From: Hongyan Xia <hongyxia@xxxxxxxxxx>
>
> When we do not have a direct map, archs_mfn_in_direct_map() will always
> return false, thus init_node_heap() will allocate xenheap pages from an
> existing node for the metadata of a new node. This means that the
> metadata of a new node is in a different node, slowing down heap
> allocation.
>
> Since we now have early vmap, vmap the metadata locally in the new node.
>
> Signed-off-by: Hongyan Xia <hongyxia@xxxxxxxxxx>
> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
> Signed-off-by: Elias El Yandouzi <eliasely@xxxxxxxxxx>
>
> ----
>
> Changes in v2:
> * vmap_contig_pages() was renamed to vmap_contig()
> * Fix indentation and coding style
>
> Changes from Hongyan's version:
> * arch_mfn_in_direct_map() was renamed to
> arch_mfns_in_direct_map()
> * Use vmap_contig_pages() rather than __vmap(...).
> * Add missing include (xen/vmap.h) so it compiles on Arm
>
> diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
> index dfb2c05322..3c0909f333 100644
> --- a/xen/common/page_alloc.c
> +++ b/xen/common/page_alloc.c
Just one thing on top of what Roger has said: This being the only file
that is touched, why "x86/setup:" as the subject prefix. It'll misguide
people to assume x86 code is what is (mainly) being touched, unless they
actually look into and scroll through the patch.
Jan
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