From: "Stephen C. Tweedie" <sct@redhat.com>
To: David Wragg <dpw@doc.ic.ac.uk>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Stephen Tweedie <sct@redhat.com>
Subject: Re: limit on number of kmapped pages
Date: Thu, 25 Jan 2001 18:16:21 +0000 [thread overview]
Message-ID: <20010125181621.W11607@redhat.com> (raw)
In-Reply-To: <y7rsnmav0cv.fsf@sytry.doc.ic.ac.uk> <m1r91udt59.fsf@frodo.biederman.org> <y7rofwxeqin.fsf@sytry.doc.ic.ac.uk>
In-Reply-To: <y7rofwxeqin.fsf@sytry.doc.ic.ac.uk>; from dpw@doc.ic.ac.uk on Wed, Jan 24, 2001 at 12:35:12AM +0000
Hi,
On Wed, Jan 24, 2001 at 12:35:12AM +0000, David Wragg wrote:
>
> > And why do the pages need to be kmapped?
>
> They only need to be kmapped while data is being copied into them.
But you only need to kmap one page at a time during the copy. There
is absolutely no need to copy the whole chunk at once.
--Stephen
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WARNING: multiple messages have this Message-ID (diff)
From: "Stephen C. Tweedie" <sct@redhat.com>
To: David Wragg <dpw@doc.ic.ac.uk>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Stephen Tweedie <sct@redhat.com>
Subject: Re: limit on number of kmapped pages
Date: Thu, 25 Jan 2001 18:16:21 +0000 [thread overview]
Message-ID: <20010125181621.W11607@redhat.com> (raw)
In-Reply-To: <y7rofwxeqin.fsf@sytry.doc.ic.ac.uk>; from dpw@doc.ic.ac.uk on Wed, Jan 24, 2001 at 12:35:12AM +0000
Hi,
On Wed, Jan 24, 2001 at 12:35:12AM +0000, David Wragg wrote:
>
> > And why do the pages need to be kmapped?
>
> They only need to be kmapped while data is being copied into them.
But you only need to kmap one page at a time during the copy. There
is absolutely no need to copy the whole chunk at once.
--Stephen
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux.eu.org/Linux-MM/
next prev parent reply other threads:[~2001-01-25 18:19 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-23 13:56 limit on number of kmapped pages David Wragg
2001-01-23 18:23 ` Eric W. Biederman
2001-01-23 18:23 ` Eric W. Biederman
2001-01-24 0:35 ` David Wragg
2001-01-24 0:35 ` David Wragg
2001-01-24 2:03 ` Benjamin C.R. LaHaise
2001-01-24 2:03 ` Benjamin C.R. LaHaise
2001-01-24 10:09 ` David Wragg
2001-01-24 10:09 ` David Wragg
2001-01-24 14:27 ` Eric W. Biederman
2001-01-24 14:27 ` Eric W. Biederman
2001-01-25 10:06 ` Random thoughts on sustained write performance Daniel Phillips
2001-01-25 10:06 ` Daniel Phillips
[not found] ` <y7rsnm7mai7.fsf@sytry.doc.ic.ac.uk>
[not found] ` <01012615062602.20169@gimli>
2001-01-27 13:50 ` David Wragg
2001-01-27 17:23 ` Daniel Phillips
2001-01-27 21:23 ` David Wragg
2001-01-25 18:16 ` Stephen C. Tweedie [this message]
2001-01-25 18:16 ` limit on number of kmapped pages Stephen C. Tweedie
2001-01-25 23:53 ` David Wragg
2001-01-25 23:53 ` David Wragg
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