From: Hugh Dickins <hugh@veritas.com>
To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Cc: Hirokazu Takahashi <taka@valinux.co.jp>,
haveblue@us.ibm.com, iwamoto@valinux.co.jp,
kamezawa.hiroyu@jp.fujitsu.com, linux-mm@kvack.org
Subject: Re: [PATCH] Migration cache
Date: Thu, 21 Oct 2004 20:09:35 +0100 (BST) [thread overview]
Message-ID: <Pine.LNX.4.44.0410212005590.12985-100000@localhost.localdomain> (raw)
In-Reply-To: <20041021103005.GA18917@logos.cnet>
On Thu, 21 Oct 2004, Marcelo Tosatti wrote:
> On Thu, Oct 21, 2004 at 02:10:44AM +0900, Hirokazu Takahashi wrote:
> >
> > I guess it would be better to reserve one swap type for the migration
> > cache instead of reserving the bit to reduce the impact of the maximum
> > number of swap types.
I thought the same ...
> By reserving one swap type we would also use a bit. Using a swap type is
> the same thing as using a bit in the swap pagetableentry. (the swap type
> has 5 bits reserved for swap devices, 2^5 = 32 swap devices).
... and don't understand your response.
Reserving a swap type leaves 31 swap devices for normal use, okay;
but reserving a bit leaves only 16 swap devices for normal use.
Hugh
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next prev parent reply other threads:[~2004-10-21 19:09 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-14 19:22 Marcelo Tosatti
2004-10-18 16:57 ` Hirokazu Takahashi
2004-10-20 17:10 ` Hirokazu Takahashi
2004-10-21 10:30 ` Marcelo Tosatti
2004-10-21 19:09 ` Hugh Dickins [this message]
2004-10-21 18:22 ` Marcelo Tosatti
2004-10-22 6:49 ` Hirokazu Takahashi
2004-10-23 19:28 ` Marcelo Tosatti
2004-10-23 22:26 ` Hugh Dickins
2004-10-24 12:21 ` Marcelo Tosatti
2004-10-24 15:37 ` Hugh Dickins
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