netdev - Re: [PATCH net-next] page_pool: Add recycle stats to page_pool_put_page

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Message-ID: <20220409172026.GA101830@fastly.com>
Date:   Sat, 9 Apr 2022 10:20:27 -0700
From:   Joe Damato <jdamato@...tly.com>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     netdev@...r.kernel.org, lorenzo.bianconi@...hat.com,
        davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        jbrouer@...hat.com, ilias.apalodimas@...aro.org
Subject: Re: [PATCH net-next] page_pool: Add recycle stats to
 page_pool_put_page_bulk

On Tue, Apr 05, 2022 at 10:52:55PM +0200, Lorenzo Bianconi wrote:
> Add missing recycle stats to page_pool_put_page_bulk routine.
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
>  net/core/page_pool.c | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/net/core/page_pool.c b/net/core/page_pool.c
> index 1943c0f0307d..4af55d28ffa3 100644
> --- a/net/core/page_pool.c
> +++ b/net/core/page_pool.c
> @@ -36,6 +36,12 @@
>  		this_cpu_inc(s->__stat);						\
>  	} while (0)
>  
> +#define recycle_stat_add(pool, __stat, val)						\
> +	do {										\
> +		struct page_pool_recycle_stats __percpu *s = pool->recycle_stats;	\
> +		this_cpu_add(s->__stat, val);						\
> +	} while (0)
> +
>  bool page_pool_get_stats(struct page_pool *pool,
>  			 struct page_pool_stats *stats)
>  {
> @@ -63,6 +69,7 @@ EXPORT_SYMBOL(page_pool_get_stats);
>  #else
>  #define alloc_stat_inc(pool, __stat)
>  #define recycle_stat_inc(pool, __stat)
> +#define recycle_stat_add(pool, __stat, val)
>  #endif
>  
>  static int page_pool_init(struct page_pool *pool,
> @@ -566,9 +573,13 @@ void page_pool_put_page_bulk(struct page_pool *pool, void **data,
>  	/* Bulk producer into ptr_ring page_pool cache */
>  	page_pool_ring_lock(pool);
>  	for (i = 0; i < bulk_len; i++) {
> -		if (__ptr_ring_produce(&pool->ring, data[i]))
> -			break; /* ring full */
> +		if (__ptr_ring_produce(&pool->ring, data[i])) {
> +			/* ring full */
> +			recycle_stat_inc(pool, ring_full);
> +			break;
> +		}
>  	}
> +	recycle_stat_add(pool, ring, i);
>  	page_pool_ring_unlock(pool);
>  
>  	/* Hopefully all pages was return into ptr_ring */
> -- 
> 2.35.1
> 

Thanks for doing this!

Reviewed-by: Joe Damato <jdamato@...tly.com>