Re: [PATCH v6 08/10] mm, vma: use percpu sheaves for vm_area_struct cache

[Vlastimil Babka <vbabka@suse.cz>]

On 9/2/25 13:13, Lorenzo Stoakes wrote:
> On Wed, Aug 27, 2025 at 10:26:40AM +0200, Vlastimil Babka wrote:
>> Create the vm_area_struct cache with percpu sheaves of size 32 to
>> improve its performance.
>>
>> Reviewed-by: Suren Baghdasaryan <surenb@google.com>
>> Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
>> ---
>>  mm/vma_init.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/mm/vma_init.c b/mm/vma_init.c
>> index 8e53c7943561e7324e7992946b4065dec1149b82..52c6b55fac4519e0da39ca75ad018e14449d1d95 100644
>> --- a/mm/vma_init.c
>> +++ b/mm/vma_init.c
>> @@ -16,6 +16,7 @@ void __init vma_state_init(void)
>>  	struct kmem_cache_args args = {
>>  		.use_freeptr_offset = true,
>>  		.freeptr_offset = offsetof(struct vm_area_struct, vm_freeptr),
>> +		.sheaf_capacity = 32,
> 
> This breaks the VMA tests.
> 
> Please also update tools/testing/vma/vma_internal.h to add this field
> (probably actually at the commit that adds the field in mainline :P)

Thanks, one of Liam's patches to support maple tree tests with sheaves does
that, we somehow missed that the vma test also needs it so will reorder
accordingly.
> I do wish we could have these tests be run by a bot :/ seems today I am
> that bot :)
Sorry :)

>>  	};
>>
>>  	vm_area_cachep = kmem_cache_create("vm_area_struct",
>>
>> --
>> 2.51.0
>>
>>
>>