From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: Xen-devel <xen-devel@lists.xen.org>
Subject: Re: [PATCH v2 7/8] xen/x86: Use 2M superpages for text/data/bss mappings
Date: Wed, 24 Feb 2016 13:21:52 +0000 [thread overview]
Message-ID: <56CDAE70.6070100@citrix.com> (raw)
In-Reply-To: <56CDBB6C02000078000D5AB6@prv-mh.provo.novell.com>
On 24/02/16 13:17, Jan Beulich wrote:
>>>> On 23.02.16 at 17:31, <andrew.cooper3@citrix.com> wrote:
>> This balloons the size of Xen in memory from 4.4MB to 8MB, because of the
>> required alignment adjustments.
> Interesting - on v1 it was 12Mb iirc, and aiui you folded just one
> pair of 2M pages, which would yield 10M now; did you perhaps
> not account for .text spanning 2 large pages, due to the 1M bias
> it starts at? But anyway...
The original 12 was me just counting 6 superpages. I forgot to account
for the 1 released back because of .init (which I suppose is now in the
following patch). That, combined with the alignment drop results in 4
in-use superpages after boot.
~Andrew
next prev parent reply other threads:[~2016-02-24 13:21 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-23 16:31 [PATCH v2 0/8] Map Xen code/data/bss with superpages Andrew Cooper
2016-02-23 16:31 ` [PATCH v2 1/8] xen/lockprof: Move .lockprofile.data into .rodata Andrew Cooper
2016-02-24 11:16 ` Jan Beulich
2016-02-23 16:31 ` [PATCH v2 2/8] xen/x86: Improvements to build-time pagetable generation Andrew Cooper
2016-02-24 11:24 ` Jan Beulich
2016-02-24 13:57 ` Andrew Cooper
2016-02-24 14:15 ` Jan Beulich
2016-02-24 14:58 ` Andrew Cooper
2016-02-24 15:18 ` Jan Beulich
2016-02-24 15:22 ` Andrew Cooper
2016-02-24 15:48 ` Jan Beulich
2016-02-24 16:14 ` Andrew Cooper
2016-02-24 16:59 ` Jan Beulich
2016-02-24 17:28 ` Andrew Cooper
2016-02-23 16:31 ` [PATCH v2 3/8] xen/x86: Construct the {l2, l3}_bootmap at compile time Andrew Cooper
2016-02-24 11:34 ` Jan Beulich
2016-02-24 11:40 ` Andrew Cooper
2016-02-24 11:50 ` Jan Beulich
2016-02-24 12:07 ` Andrew Cooper
2016-02-23 16:31 ` [PATCH v2 4/8] xen/memguard: Drop memguard_init() entirely Andrew Cooper
2016-02-24 13:26 ` Jan Beulich
2016-02-24 15:02 ` Stefano Stabellini
2016-02-23 16:31 ` [PATCH v2 5/8] xen/x86: Disable CR0.WP while applying alternatives Andrew Cooper
2016-02-23 16:31 ` [PATCH v2 6/8] xen/x86: Reorder .data and .init when linking Andrew Cooper
2016-02-24 11:41 ` Jan Beulich
2016-02-24 11:44 ` Andrew Cooper
2016-02-23 16:31 ` [PATCH v2 7/8] xen/x86: Use 2M superpages for text/data/bss mappings Andrew Cooper
2016-02-24 13:17 ` Jan Beulich
2016-02-24 13:21 ` Andrew Cooper [this message]
2016-02-24 13:23 ` Andrew Cooper
2016-02-23 16:31 ` [PATCH v2 8/8] xen/x86: Unilaterally remove .init mappings Andrew Cooper
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