linux-kernel - Re: [PATCH 2/2] zsmalloc: micro-optimize zs_object

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Message-ID: <20150325150750.GD3814@blaptop>
Date:	Thu, 26 Mar 2015 00:07:50 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Nitin Gupta <ngupta@...are.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCH 2/2] zsmalloc: micro-optimize zs_object_copy()

On Wed, Mar 25, 2015 at 12:24:47AM +0900, Sergey Senozhatsky wrote:
> A micro-optimization. Avoid additional branching and reduce
> (a bit) registry pressure (f.e. s_off += size; d_off += size;
> may be calculated twise: first for >= PAGE_SIZE check and later
> for offset update in "else" clause).
> 
> /scripts/bloat-o-meter shows some improvement
> 
> add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-10 (-10)
> function                          old     new   delta
> zs_object_copy                    550     540     -10
> 
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>

Acked-by: Minchan Kim <minchan@...nel.org>

Thanks.

-- 
Kind regards,
Minchan Kim
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