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[PATCH v2] zsmalloc: use class->pages_per_zspage

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  [PATCH v2] zsmalloc: use class->pages_per_zspage Minchan Kim <minchan@kernel.org> - 2015-07-16 02:20 +0200
    Re: [PATCH v2] zsmalloc: use class->pages_per_zspage Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2015-07-16 02:30 +0200

#1185134 — [PATCH v2] zsmalloc: use class->pages_per_zspage

There is no need to recalcurate pages_per_zspage in runtime.
Just use class->pages_per_zspage to avoid unnecessary runtime
overhead.

* From v1
  * fix up __zs_compact - Sergey

Signed-off-by: Minchan Kim <minchan@kernel.org>
---
 mm/zsmalloc.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 27b9661c8fa6..c9685bb2bb92 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1711,7 +1711,7 @@ static unsigned long zs_can_compact(struct size_class *class)
 	obj_wasted /= get_maxobj_per_zspage(class->size,
 			class->pages_per_zspage);
 
-	return obj_wasted * get_pages_per_zspage(class->size);
+	return obj_wasted * class->pages_per_zspage;
 }
 
 static void __zs_compact(struct zs_pool *pool, struct size_class *class)
@@ -1749,8 +1749,7 @@ static void __zs_compact(struct zs_pool *pool, struct size_class *class)
 
 		putback_zspage(pool, class, dst_page);
 		if (putback_zspage(pool, class, src_page) == ZS_EMPTY)
-			pool->stats.pages_compacted +=
-				get_pages_per_zspage(class->size);
+			pool->stats.pages_compacted += class->pages_per_zspage;
 		spin_unlock(&class->lock);
 		cond_resched();
 		spin_lock(&class->lock);
-- 
1.9.1

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#1185141

On (07/16/15 09:10), Minchan Kim wrote:
> There is no need to recalcurate pages_per_zspage in runtime.
> Just use class->pages_per_zspage to avoid unnecessary runtime
> overhead.
> 
> * From v1
>   * fix up __zs_compact - Sergey
> 
> Signed-off-by: Minchan Kim <minchan@kernel.org>

thanks.

Acked-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

	-ss

> ---
>  mm/zsmalloc.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
> index 27b9661c8fa6..c9685bb2bb92 100644
> --- a/mm/zsmalloc.c
> +++ b/mm/zsmalloc.c
> @@ -1711,7 +1711,7 @@ static unsigned long zs_can_compact(struct size_class *class)
>  	obj_wasted /= get_maxobj_per_zspage(class->size,
>  			class->pages_per_zspage);
>  
> -	return obj_wasted * get_pages_per_zspage(class->size);
> +	return obj_wasted * class->pages_per_zspage;
>  }
>  
>  static void __zs_compact(struct zs_pool *pool, struct size_class *class)
> @@ -1749,8 +1749,7 @@ static void __zs_compact(struct zs_pool *pool, struct size_class *class)
>  
>  		putback_zspage(pool, class, dst_page);
>  		if (putback_zspage(pool, class, src_page) == ZS_EMPTY)
> -			pool->stats.pages_compacted +=
> -				get_pages_per_zspage(class->size);
> +			pool->stats.pages_compacted += class->pages_per_zspage;
>  		spin_unlock(&class->lock);
>  		cond_resched();
>  		spin_lock(&class->lock);
--
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