From: "H. Peter Anvin" <hpa@zytor.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: xen-devel@lists.xensource.com, yinghai@kernel.org,
linux-kernel@vger.kernel.org, stefano.stabellini@eu.citrix.com
Subject: Re: Re: [PATCH] Two patches fixing regression introduced by 'x86-64, mm: Put early page table high'
Date: Mon, 02 May 2011 11:33:16 -0700 [thread overview]
Message-ID: <4DBEF8EC.7080301@zytor.com> (raw)
In-Reply-To: <20110502180802.GA7498@dumpdata.com>
On 05/02/2011 11:08 AM, Konrad Rzeszutek Wilk wrote:
>>
>> My inclination would be to apply your workaround -- are there any
>> adverse effects to doing that?
>
> There is a bootup slowdown (not noticeable). That is because we call the
> 'memblock_find_range' function on every PTE table creation (only during
> bootup of course).
>
> Testing wise, on the machines on which the regression occurred, with these two
> patches the regression disappears - so that is a good sign. I am testing
> it on some more today to assure myself I am not missing anything.
>
OK, sounds like a plan then. I like it because it doesn't affect the
native kernel.
-hpa
next prev parent reply other threads:[~2011-05-02 18:33 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-02 17:22 [PATCH] Two patches fixing regression introduced by 'x86-64, mm: Put early page table high' Konrad Rzeszutek Wilk
2011-05-02 17:22 ` [PATCH 1/2] xen/mmu: Add workaround "x86-64, mm: Put early page table high" Konrad Rzeszutek Wilk
2011-05-03 0:55 ` Daniel Kiper
2011-05-03 15:12 ` Konrad Rzeszutek Wilk
2011-05-03 19:51 ` Daniel Kiper
2011-05-04 18:59 ` Daniel Kiper
2011-05-04 19:33 ` [Xen-devel] " Konrad Rzeszutek Wilk
2011-05-05 11:34 ` Daniel Kiper
2011-05-05 12:55 ` Stefano Stabellini
2011-05-05 14:01 ` Konrad Rzeszutek Wilk
2011-05-05 14:06 ` Stefano Stabellini
2011-05-09 7:06 ` Daniel Kiper
2011-05-03 13:20 ` Stefano Stabellini
2011-05-03 15:27 ` Konrad Rzeszutek Wilk
2011-05-02 17:22 ` [PATCH 2/2] xen: mask_rw_pte mark RO all pagetable pages up to pgt_buf_top Konrad Rzeszutek Wilk
2011-05-02 17:31 ` [PATCH] Two patches fixing regression introduced by 'x86-64, mm: Put early page table high' H. Peter Anvin
2011-05-02 18:08 ` [Xen-devel] " Konrad Rzeszutek Wilk
2011-05-02 18:33 ` H. Peter Anvin [this message]
2011-05-02 19:34 ` Konrad Rzeszutek Wilk
2011-05-02 19:59 ` [Xen-devel] " H. Peter Anvin
2011-05-02 20:07 ` Konrad Rzeszutek Wilk
2011-05-02 20:16 ` Yinghai Lu
2011-05-05 16:28 ` Re: [PATCH] Two patches fixing regression introduced by 'x86-64, mm: Put early page table high' - does not work Konrad Rzeszutek Wilk
2011-05-05 18:45 ` [Xen-devel] " Konrad Rzeszutek Wilk
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