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From: Olaf Hering <olaf@aepfle.de>
To: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: Re: non-contiguous allocations
Date: Fri, 6 May 2011 20:12:34 +0200	[thread overview]
Message-ID: <20110506181234.GA24767@aepfle.de> (raw)
In-Reply-To: <20110418184541.GA16935@aepfle.de>

On Mon, Apr 18, Olaf Hering wrote:

> On Fri, Apr 01, George Dunlap wrote:
> 
> > On Wed, 2011-03-30 at 19:04 +0100, Olaf Hering wrote:
> > > Using the u16 means each cpu could in theory use up to 256MB as trace
> > > buffer. However such a large allocation will currently fail on x86 due
> > > to the MAX_ORDER limit.
> > 
> > FWIW, I don't believe that there's any reason the allocations have to be
> > contiguous any more.  I kept them contiguous to minimize the changes to
> > the moving parts near a release.  But the new system has been pretty
> > well tested now, so I think looking at non-contiguous allocations may be
> > worthwhile.

Is there a way to allocate more than 128mb with repeated calls to
alloc_xenheap_page()?  From which pool should the per-cpu tracebuffers
get allocated?  alloc_domheap_page() wants a domain, so I think thats
the wrong interface.

Olaf

  parent reply	other threads:[~2011-05-06 18:12 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-03-30 18:04 [PATCH 0 of 3] xentrace updates Olaf Hering
2011-03-30 18:04 ` [PATCH 1 of 3] xentrace: correct formula to calculate t_info_pages Olaf Hering
2011-04-01 10:32   ` George Dunlap
2011-03-30 18:04 ` [PATCH 2 of 3] xentrace: use tbuf_size for overflow check Olaf Hering
2011-04-01 11:18   ` George Dunlap
2011-04-05 10:19     ` Olaf Hering
2011-04-07 13:50     ` Olaf Hering
2011-04-18 18:45     ` non-contiguous allocations Olaf Hering
2011-04-26 11:51       ` Jan Beulich
2011-05-06 10:25         ` Olaf Hering
2011-05-06 10:45           ` Jan Beulich
2011-05-06 18:12       ` Olaf Hering [this message]
2011-05-06 18:46         ` Keir Fraser
2011-05-07  8:39           ` Olaf Hering
2011-05-07 16:31             ` Keir Fraser
2011-05-09  8:30           ` Jan Beulich
2011-05-09  8:34             ` Keir Fraser
2011-05-09 12:43           ` Olaf Hering
2011-05-09 14:14             ` Keir Fraser
2011-03-30 18:04 ` [PATCH 3 of 3] xentrace: remove unneeded debug printk Olaf Hering
2011-04-01 11:18   ` George Dunlap

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