Re: [PATCH 1/5] mm: memcg: factor out trylock_stock() and unlock_stock()

["Vlastimil Babka (SUSE)" <vbabka@kernel.org>]

On 3/2/26 20:50, Johannes Weiner wrote:
> From: Johannes Weiner <jweiner@meta.com>
> 
> Consolidate the local lock acquisition and the local stock
> lookup. This allows subsequent patches to use !!stock as an easy way
> to disambiguate the locked vs. contended cases through the callstack.
> 
> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>

Reviewed-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>

nit:

> ---
>  mm/memcontrol.c | 25 +++++++++++++++++++------
>  1 file changed, 19 insertions(+), 6 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 753d76e96cc6..a975ab3aee10 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -3208,6 +3208,19 @@ void __memcg_kmem_uncharge_page(struct page *page, int order)
>  	obj_cgroup_put(objcg);
>  }
>  
> +static struct obj_stock_pcp *trylock_stock(void)
> +{
> +	if (local_trylock(&obj_stock.lock))
> +		return this_cpu_ptr(&obj_stock);
> +
> +	return NULL;
> +}
> +
> +static void unlock_stock(struct obj_stock_pcp *stock)
> +{
> +	local_unlock(&obj_stock.lock);
> +}

Could have added inline's there. The compiler heuristics can be sometimes
unpredictable.