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

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Message-Id: <20080415122220.748834b7.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 15 Apr 2008 12:22:20 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Li Zefan <lizf@...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. v2

On Tue, 15 Apr 2008 11:14:24 +0800
Li Zefan <lizf@...fujitsu.com> wrote:

> KAMEZAWA Hiroyuki wrote:
> > On Mon, 14 Apr 2008 19:17:30 -0700
> > Andrew Morton <akpm@...ux-foundation.org> wrote:
> >> Well...  vmalloced memory is of course a little slower to use - additional
> >> TLB pressure.
> >>
> >> Do you think the memcgroup is accessed frequently enough to use vmalloc()
> >> only on those architectures which actually need it?
> >>
> >> Because it'd be pretty simple to implement:
> >>
> >> 	if (sizeof(struct mem_group) > PAGE_SIZE)
> >> 		vmalloc()
> >> 	else
> >> 		kmalloc()
> >>
> >> 	...
> >>
> >> 	if (sizeof(struct mem_group) > PAGE_SIZE)
> >> 		vfree()
> >> 	else
> >> 		kfree()
> >>
> >> the compiler will optimise away the `if'.
> >>
> > 
> > Hmm, ok. I'll rewrite one to do that.
> > 
> 
> It will be better to use wrappers for these: mem_cgroup_alloc() and mem_cgroup_free()
> 
yes. will do

-Kame
> > Thanks,
> > -Kame
> > 
> > 
> > 
> 

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