linux-kernel - Re: [PATCH 2/2] Drivers: hv: balloon: Support 2M page allocations for ballooning

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Message-ID: <20130318105257.GG10192@dhcp22.suse.cz>
Date:	Mon, 18 Mar 2013 11:52:57 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	andi@...stfloor.org, akpm@...ux-foundation.org, linux-mm@...ck.org,
	kamezawa.hiroyuki@...il.com, hannes@...xchg.org, yinghan@...gle.com
Subject: Re: [PATCH 2/2] Drivers: hv: balloon: Support 2M page allocations
 for ballooning

On Sat 16-03-13 14:42:05, K. Y. Srinivasan wrote:
> While ballooning memory out of the guest, attempt 2M allocations first.
> If 2M allocations fail, then go for 4K allocations. In cases where we
> have performed 2M allocations, split this 2M page so that we can free this
> page at 4K granularity (when the host returns the memory).

Maybe I am missing something but what is the advantage of 2M allocation
when you split it up immediately so you are not using it as a huge page?

[...]
-- 
Michal Hocko
SUSE Labs
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