linux-kernel - Re: bootmem allocator

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Message-ID: <86802c440804071445l7bef949fg5c500f0c09ae40e@mail.gmail.com>
Date:	Mon, 7 Apr 2008 14:45:57 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Andi Kleen" <andi@...stfloor.org>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Cyrill Gorcunov" <gorcunov@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: bootmem allocator

On Mon, Apr 7, 2008 at 12:44 PM, Andi Kleen <andi@...stfloor.org> wrote:
>
> Ingo Molnar <mingo@...e.hu> writes:
>
>  > * Cyrill Gorcunov <gorcunov@...il.com> wrote:
>  >
>  >> Hi Ingo, Peter,
>  >>
>  >> small question. It was a patch recently posted which removes memset(x,
>  >> 0, x) after __alloc_bootmem call. There are a few another code
>  >> snippets who still call memset(x, 0, x). And who is responsible for
>  >> memory clearing? bootmem allocator or caller?
>  >
>  > hm, bootmem allocator is supposed to clear memory. We have a couple of
>  > places that rely on that.
>
>  I was actually considering to change that for the GB pages hugetlbfs
>  patchkit, because memset for 1G is a little slow and not needed (will be cleared later
>  anyways) and it might be a problem for very large systems with a lot of such
>  pages at boot.

add another zalloc_bootmem?

YH
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