linux-kernel - Re: [PATCH v6 2/8] mm: vmalloc: don't account for number of nodes for HUGE

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Message-ID: <ZxQwbXh5v7eJmuyh@bombadil.infradead.org>
Date: Sat, 19 Oct 2024 15:19:25 -0700
From: Luis Chamberlain <mcgrof@...nel.org>
To: Mike Rapoport <rppt@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
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	Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v6 2/8] mm: vmalloc: don't account for number of nodes
 for HUGE_VMAP allocations

On Wed, Oct 16, 2024 at 03:24:18PM +0300, Mike Rapoport wrote:
> From: "Mike Rapoport (Microsoft)" <rppt@...nel.org>
> 
> vmalloc allocations with VM_ALLOW_HUGE_VMAP that do not explicitly
> specify node ID will use huge pages only if size_per_node is larger than
> a huge page.
> Still the actual allocated memory is not distributed between nodes and
> there is no advantage in such approach.
> On the contrary, BPF allocates SZ_2M * num_possible_nodes() for each
> new bpf_prog_pack, while it could do with a single huge page per pack.
> 
> Don't account for number of nodes for VM_ALLOW_HUGE_VMAP with
> NUMA_NO_NODE and use huge pages whenever the requested allocation size
> is larger than a huge page.
> 
> Signed-off-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
> Reviewed-by: Christoph Hellwig <hch@....de>

Reviewed-by: Luis Chamberlain <mcgrof@...nel.org>

  Luis