linux-kernel - Re: [PATCH 2/2] mm/bootmem.c: substitute kzalloc

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Date:   Mon, 29 Aug 2016 21:26:15 +0800
From:   zijun_hu <zijun_hu@...o.com>
To:     akpm@...ux-foundation.org, mingo@...nel.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org, zijun_hu@....com
Subject: Re: [PATCH 2/2] mm/bootmem.c: substitute kzalloc_node() for kzalloc()

i am sorry, this patch has many bugs
i resend it in another mail thread
please ignore it

On 2016/8/27 23:35, zijun_hu wrote:
> From: zijun_hu <zijun_hu@....com>
> 
> in ___alloc_bootmem_node_nopanic(), substitute kzalloc_node()
> for kzalloc() in order to allocate memory within given node
> preferentially when slab is available
> 
> free_all_bootmem_core() is optimized to make the first two parameters
> of __free_pages_bootmem() looks consistent with each other apparently
> when freeing bdata->node_bootmem_map
> 
> Signed-off-by: zijun_hu <zijun_hu@....com>
> ---
>  mm/bootmem.c | 21 ++++++---------------
>  1 file changed, 6 insertions(+), 15 deletions(-)
> 
> diff --git a/mm/bootmem.c b/mm/bootmem.c
> index 0aa7dda52402..615acca2e0cb 100644
> --- a/mm/bootmem.c
> +++ b/mm/bootmem.c
> @@ -11,15 +11,12 @@
>  #include <linux/init.h>
>  #include <linux/pfn.h>
>  #include <linux/slab.h>
> -#include <linux/bootmem.h>
>  #include <linux/export.h>
>  #include <linux/kmemleak.h>
>  #include <linux/range.h>
> -#include <linux/memblock.h>
>  #include <linux/bug.h>
>  #include <linux/io.h>
> -
> -#include <asm/processor.h>
> +#include <linux/bootmem.h>
>  
>  #include "internal.h"
>  
> @@ -229,13 +226,14 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
>  		}
>  	}
>  
> -	cur = bdata->node_min_pfn;
>  	page = virt_to_page(bdata->node_bootmem_map);
>  	pages = bdata->node_low_pfn - bdata->node_min_pfn;
>  	pages = bootmem_bootmap_pages(pages);
>  	count += pages;
> -	while (pages--)
> -		__free_pages_bootmem(page++, cur++, 0);
> +	while (pages--) {
> +		__free_pages_bootmem(page, page_to_pfn(page), 0);
> +		page++;
> +	}
>  	bdata->node_bootmem_map = NULL;
>  
>  	bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);
> @@ -712,7 +710,7 @@ void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
>  	void *ptr;
>  
>  	if (WARN_ON_ONCE(slab_is_available()))
> -		return kzalloc(size, GFP_NOWAIT);
> +		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
>  again:
>  
>  	/* do not panic in alloc_bootmem_bdata() */
> @@ -738,9 +736,6 @@ again:
>  void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
>  				   unsigned long align, unsigned long goal)
>  {
> -	if (WARN_ON_ONCE(slab_is_available()))
> -		return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
> -
>  	return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
>  }
>  
> @@ -812,10 +807,6 @@ void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
>  
>  }
>  
> -#ifndef ARCH_LOW_ADDRESS_LIMIT
> -#define ARCH_LOW_ADDRESS_LIMIT	0xffffffffUL
> -#endif
> -
>  /**
>   * __alloc_bootmem_low - allocate low boot memory
>   * @size: size of the request in bytes
>