From: Yinghai Lu <yinghai@kernel.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Subject: Re: [PATCH] x86: put initial_pg_tables into bss -v2
Date: Sun, 01 Mar 2009 09:49:23 -0800 [thread overview]
Message-ID: <49AACAA3.1060806@kernel.org> (raw)
In-Reply-To: <49AA5356.3050602@zytor.com>
H. Peter Anvin wrote:
> Yinghai Lu wrote:
>> Impact: cleanup
>>
>> Don't use ram after _end blindly for pagetables.
>> put those pg table into bss
>>
>> also remove init_pg_tables_start/end tricks all around
>>
>> v2: keep initial page table up to 512M only.
>>
>
> I really, REALLY, don't like this. This is going right back to the
> situation which we had before the dynamically generated page tables. We
> now have yet another hardcoded limit, and big chunk of wasted memory in
> case we don't need to allocate it all.
that limit is there in for 64 too. aka 512M direct mapping. (need 1Mbytes space for page tables)
we can get rid of that limit: with careful link sequence to make sure that code init_memory_mapping and before is some fixed range.
YH
next prev parent reply other threads:[~2009-03-01 17:50 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-28 1:51 [PATCH] Simple brk allocator for very early allocations Jeremy Fitzhardinge
2009-02-28 1:51 ` [PATCH] x86: add brk allocation for very, " Jeremy Fitzhardinge
2009-02-28 1:51 ` [PATCH] x86: reserve brk earlier Jeremy Fitzhardinge
2009-02-28 1:51 ` [PATCH] x86-32: use brk segment for allocating initial kernel pagetable Jeremy Fitzhardinge
2009-02-28 7:02 ` Yinghai Lu
2009-02-28 7:05 ` J Jeremy Fitzhardinge
2009-02-28 7:15 ` J Ingo Molnar
2009-02-28 7:39 ` does boot loader check uncompressed kernel size? Yinghai Lu
2009-02-28 7:47 ` Cyrill Gorcunov
2009-02-28 7:54 ` Yinghai Lu
2009-02-28 8:08 ` H. Peter Anvin
2009-02-28 20:42 ` Yinghai Lu
2009-02-28 7:52 ` brk patches Yinghai Lu
2009-02-28 8:08 ` H. Peter Anvin
2009-02-28 8:17 ` Jeremy Fitzhardinge
2009-02-28 20:40 ` Yinghai Lu
2009-03-01 23:53 ` Jeremy Fitzhardinge
2009-03-02 1:02 ` Yinghai Lu
2009-03-02 1:07 ` H. Peter Anvin
2009-03-02 1:16 ` Jeremy Fitzhardinge
2009-03-02 1:36 ` H. Peter Anvin
2009-03-02 1:54 ` Jeremy Fitzhardinge
2009-03-02 2:12 ` Yinghai Lu
2009-03-01 1:23 ` [PATCH] x86: put initial_pg_tables into bss Yinghai Lu
2009-03-01 8:31 ` [PATCH] x86: put initial_pg_tables into bss -v2 Yinghai Lu
2009-03-01 9:20 ` H. Peter Anvin
2009-03-01 17:49 ` Yinghai Lu [this message]
2009-03-01 18:06 ` Yinghai Lu
2009-03-01 23:29 ` H. Peter Anvin
2009-03-02 0:55 ` Yinghai Lu
2009-03-09 8:15 ` [PATCH] x86: put initial_pg_tables into .bss -v4 Yinghai Lu
2009-03-09 15:41 ` H. Peter Anvin
2009-03-09 17:35 ` Yinghai Lu
2009-03-09 18:28 ` H. Peter Anvin
2009-03-11 1:39 ` Jeremy Fitzhardinge
2009-03-09 7:45 ` [PATCH] x86: put initial_pg_tables into bss -v2 Yinghai Lu
2009-02-28 8:07 ` does boot loader check uncompressed kernel size? H. Peter Anvin
2009-02-28 8:17 ` J Jeremy Fitzhardinge
2009-02-28 7:30 ` J Yinghai Lu
2009-02-28 1:51 ` [PATCH] x86: use brk allocation for DMI Jeremy Fitzhardinge
2009-02-28 1:51 ` [PATCH] x86: leave _brk_end defined Jeremy Fitzhardinge
2009-02-28 5:23 ` [PATCH] Simple brk allocator for very early allocations Andrew Morton
2009-02-28 6:30 ` Jeremy Fitzhardinge
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