linux-kernel - Re: [PATCH V1 2/2] mm/damon: move damon

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Date:   Sun, 21 Nov 2021 11:33:12 +0000
From:   SeongJae Park <sj@...nel.org>
To:     Xin Hao <xhao@...ux.alibaba.com>
Cc:     sj@...nel.org, akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V1 2/2] mm/damon: move damon_rand definition into damon.h

Hi Xin,


On Sun, 21 Nov 2021 01:27:54 +0800 Xin Hao <xhao@...ux.alibaba.com> wrote:

> damon_rand() is called in three files:damon/core.c, damon/
> paddr.c, damon/vaddr.c, i think there is no need to redefine
> this twice, So move it to damon.h will be a good choice.

Good finding.  Could you please append '()' after 'damon_rand' in the title
(s/damon_rand definition/damon_rand() definition)?

> 
> Signed-off-by: Xin Hao <xhao@...ux.alibaba.com>

After doing that, you could add

Reviewed-by: SeongJae Park <sj@...nel.org>


Thanks,
SJ

> ---
>  include/linux/damon.h   | 4 ++++
>  mm/damon/core.c         | 4 ----
>  mm/damon/prmtv-common.h | 4 ----
>  3 files changed, 4 insertions(+), 8 deletions(-)
> 
> diff --git a/include/linux/damon.h b/include/linux/damon.h
> index 8a73e825e0d5..8706b17a9acf 100644
> --- a/include/linux/damon.h
> +++ b/include/linux/damon.h
> @@ -11,12 +11,16 @@
>  #include <linux/mutex.h>
>  #include <linux/time64.h>
>  #include <linux/types.h>
> +#include <linux/random.h>
>  
>  /* Minimal region size.  Every damon_region is aligned by this. */
>  #define DAMON_MIN_REGION	PAGE_SIZE
>  /* Max priority score for DAMON-based operation schemes */
>  #define DAMOS_MAX_SCORE		(99)
>  
> +/* Get a random number in [l, r) */
> +#define damon_rand(l, r) (l + prandom_u32_max(r - l))
> +
>  /**
>   * struct damon_addr_range - Represents an address region of [@start, @end).
>   * @start:	Start address of the region (inclusive).
> diff --git a/mm/damon/core.c b/mm/damon/core.c
> index 4d2c3a0c7c8a..bdec32ef78c0 100644
> --- a/mm/damon/core.c
> +++ b/mm/damon/core.c
> @@ -11,7 +11,6 @@
>  #include <linux/delay.h>
>  #include <linux/kthread.h>
>  #include <linux/mm.h>
> -#include <linux/random.h>
>  #include <linux/slab.h>
>  #include <linux/string.h>
>  
> @@ -23,9 +22,6 @@
>  #define DAMON_MIN_REGION 1
>  #endif
>  
> -/* Get a random number in [l, r) */
> -#define damon_rand(l, r) (l + prandom_u32_max(r - l))
> -
>  static DEFINE_MUTEX(damon_lock);
>  static int nr_running_ctxs;
>  
> diff --git a/mm/damon/prmtv-common.h b/mm/damon/prmtv-common.h
> index 61f27037603e..e790cb5f8fe0 100644
> --- a/mm/damon/prmtv-common.h
> +++ b/mm/damon/prmtv-common.h
> @@ -6,10 +6,6 @@
>   */
>  
>  #include <linux/damon.h>
> -#include <linux/random.h>
> -
> -/* Get a random number in [l, r) */
> -#define damon_rand(l, r) (l + prandom_u32_max(r - l))
>  
>  struct page *damon_get_page(unsigned long pfn);
>  
> -- 
> 2.31.0
> 
>