linux-kernel - Re: [PATCH] use vmalloc for mem

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Date:	Tue, 15 Apr 2008 09:57:17 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"xemul@...nvz.org" <xemul@...nvz.org>, menage@...gle.com,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] use vmalloc for mem_cgroup allocation.

KAMEZAWA Hiroyuki wrote:
> On ia64, kmalloc() in mem_cgroup_create requires order-4 pages. But this is not
> necessary to be phisically contiguous. And we'll see page allocation failure.
> (Note: x86-32, which has small vmalloc area, has small mem_cgroup struct.)
> For here, vmalloc is better.
> 
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> Index: mm-2.6.25-rc8-mm2/mm/memcontrol.c
> ===================================================================
> --- mm-2.6.25-rc8-mm2.orig/mm/memcontrol.c
> +++ mm-2.6.25-rc8-mm2/mm/memcontrol.c
> @@ -31,6 +31,7 @@
>  #include <linux/spinlock.h>
>  #include <linux/fs.h>
>  #include <linux/seq_file.h>
> +#include <linux/vmalloc.h>
>  
>  #include <asm/uaccess.h>
>  
> @@ -993,7 +994,7 @@ mem_cgroup_create(struct cgroup_subsys *
>  		mem = &init_mem_cgroup;
>  		page_cgroup_cache = KMEM_CACHE(page_cgroup, SLAB_PANIC);
>  	} else
> -		mem = kzalloc(sizeof(struct mem_cgroup), GFP_KERNEL);
> +		mem = vmalloc(sizeof(struct mem_cgroup));
>  

memset(mem, 0, sizeof(*mem));

should we initialize it with 0?

>  	if (mem == NULL)
>  		return ERR_PTR(-ENOMEM);
> @@ -1011,7 +1012,7 @@ free_out:
>  	for_each_node_state(node, N_POSSIBLE)
>  		free_mem_cgroup_per_zone_info(mem, node);
>  	if (cont->parent != NULL)
> -		kfree(mem);
> +		vfree(mem);
>  	return ERR_PTR(-ENOMEM);
>  }
>  
> @@ -1031,7 +1032,7 @@ static void mem_cgroup_destroy(struct cg
>  	for_each_node_state(node, N_POSSIBLE)
>  		free_mem_cgroup_per_zone_info(mem, node);
>  
> -	kfree(mem_cgroup_from_cont(cont));
> +	vfree(mem_cgroup_from_cont(cont));
>  }
>  
>  static int mem_cgroup_populate(struct cgroup_subsys *ss,
> 
>
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