linux-kernel - Re: [PATCH v4 8/9] mm, vma: use percpu sheaves for vm_area

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Message-ID: <CAJuCfpH5omB4CUJEvT=GzKmj3bYn=1zSGXZckbY8Bon8UbbdZg@mail.gmail.com>
Date: Tue, 6 May 2025 16:08:53 -0700
From: Suren Baghdasaryan <surenb@...gle.com>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: "Liam R. Howlett" <Liam.Howlett@...cle.com>, Christoph Lameter <cl@...ux.com>, 
	David Rientjes <rientjes@...gle.com>, Roman Gushchin <roman.gushchin@...ux.dev>, 
	Harry Yoo <harry.yoo@...cle.com>, Uladzislau Rezki <urezki@...il.com>, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, rcu@...r.kernel.org, 
	maple-tree@...ts.infradead.org
Subject: Re: [PATCH v4 8/9] mm, vma: use percpu sheaves for vm_area_struct cache

On Fri, Apr 25, 2025 at 1:28 AM Vlastimil Babka <vbabka@...e.cz> wrote:
>
> Create the vm_area_struct cache with percpu sheaves of size 32 to
> improve its performance.
>
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>

I think Lorenzo's refactoring moved this code out of fork.c, so it
will have to be adjusted.

Reviewed-by: Suren Baghdasaryan <surenb@...gle.com>

> ---
>  kernel/fork.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/kernel/fork.c b/kernel/fork.c
> index c4b26cd8998b8e7b2b516e0bb0b1d4676ff644dc..3bd711f0798c88aee04bc30ff21fc4ca2b66201a 100644
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@ -3216,6 +3216,7 @@ void __init proc_caches_init(void)
>         struct kmem_cache_args args = {
>                 .use_freeptr_offset = true,
>                 .freeptr_offset = offsetof(struct vm_area_struct, vm_freeptr),
> +               .sheaf_capacity = 32,
>         };
>
>         sighand_cachep = kmem_cache_create("sighand_cache",
>
> --
> 2.49.0
>