From: Andi Kleen <andi@firstfloor.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>,
"H. Peter Anvin" <hpa@zytor.com>,
LKML <linux-kernel@vger.kernel.org>,
Yinghai Lu <yhlu.kernel@gmail.com>
Subject: Re: bootmem allocator
Date: Mon, 07 Apr 2008 21:44:04 +0200 [thread overview]
Message-ID: <87iqytqwl7.fsf@basil.nowhere.org> (raw)
In-Reply-To: <20080407190904.GH12292@elte.hu> (Ingo Molnar's message of "Mon, 7 Apr 2008 21:09:04 +0200")
Ingo Molnar <mingo@elte.hu> writes:
> * Cyrill Gorcunov <gorcunov@gmail.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.
-Andi
next prev parent reply other threads:[~2008-04-07 19:44 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-07 18:56 bootmem allocator Cyrill Gorcunov
2008-04-07 19:09 ` Ingo Molnar
2008-04-07 19:44 ` Andi Kleen [this message]
2008-04-07 21:45 ` Yinghai Lu
2008-04-08 4:14 ` Cyrill Gorcunov
2008-04-08 4:33 ` H. Peter Anvin
2008-04-08 5:50 ` Cyrill Gorcunov
2008-04-08 16:18 ` Cyrill Gorcunov
2008-04-08 8:04 ` Ingo Molnar
2008-04-08 8:12 ` Andi Kleen
2008-04-08 13:57 ` Cyrill Gorcunov
2008-04-08 17:34 ` Cyrill Gorcunov
2008-04-08 17:44 ` H. Peter Anvin
2008-04-09 6:00 ` Mike Travis
2008-04-09 6:08 ` Andi Kleen
2008-04-09 6:55 ` Mike Travis
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