From: "Jan Beulich" <JBeulich@suse.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>,
xen-devel@lists.xen.org,
Elena Ufimtseva <elena.ufimtseva@oracle.com>
Cc: adnan.misherfi@oracle.com
Subject: Re: page faults on machines with > 4TB memory
Date: Fri, 24 Jul 2015 04:01:17 -0600 [thread overview]
Message-ID: <55B2290D02000078000950C1@prv-mh.provo.novell.com> (raw)
In-Reply-To: <55B11DF9.4030002@citrix.com>
>>> On 23.07.15 at 19:01, <andrew.cooper3@citrix.com> wrote:
> Observe that ffff8840ffdb53c0 is actually a pointer in the 64bit PV
> virtual region, because the xenheap allocator has wandered off the top
> of the directmap region. This is a direct result of passing numa node
> information to alloc_xenheap_page(), which overrides the check which
> keeps the allocation inside the directmap region.
Does it? Looking at the code I can't see why it would:
alloc_heap_pages() only ever looks at [zone_lo, zone_hi], regardless
of requested node, and alloc_domheap_pages() determines the zone
range based on the bit width requested by the caller
(alloc_xenheap_pages() in this case, unless its caller has asked for
a smaller address width or xenheap_bits isn't set).
Jan
prev parent reply other threads:[~2015-07-24 10:01 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-23 16:35 page faults on machines with > 4TB memory Elena Ufimtseva
2015-07-23 17:01 ` Andrew Cooper
2015-07-23 17:45 ` Elena Ufimtseva
2015-07-24 10:01 ` Jan Beulich [this message]
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