From: David Howells <dhowells@redhat.com>
To: Andrew Morton <akpm@osdl.org>
Cc: dwmw2@infradead.org, hch@infradead.org, torvalds@osdl.org,
davidm@snapgear.com, linux-kernel@vger.kernel.org,
uclinux-dev@uclinux.org, kamezawa.hiroyu@jp.fujitsu.com
Subject: Re: [PATCH] VM routine fixes
Date: Thu, 11 Nov 2004 12:03:04 +0000 [thread overview]
Message-ID: <25483.1100174584@redhat.com> (raw)
In-Reply-To: <20041111034353.00d35589.akpm@osdl.org>
> > No, it isn't. munmap() is prohibited from releasing anything other than a
> > complete mmap() on uClinux.
>
> hrm. I'd have thought that such a restriction would be unnecessary if we
> get the page refcounting done right. With, say, compound pages!
I don't think you want to go there. Don't forget in a lot of cases you're
dealing with shared objects, and so you can't just go punching holes in the
middle thereof.
> Compound pages are just a way of handling refcounting of a higher-order
> page. Nothing to do with TLBs at all.
In that case, I'll look at making compound pages mandatory if you wish. I'd
rather avoid doing so because they incur additional overheads, and it'll be on
MMU and !MMU both, but it does make multi-order page handling appear more
robust.
David
next prev parent reply other threads:[~2004-11-11 12:03 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-08 14:32 [PATCH] VM routine fixes dhowells
2004-11-09 12:55 ` Christoph Hellwig
2004-11-09 13:53 ` David Howells
2004-11-09 14:01 ` Christoph Hellwig
2004-11-10 13:37 ` David Howells
2004-11-10 19:01 ` Andrew Morton
2004-11-11 1:17 ` David Woodhouse
2004-11-11 2:26 ` Andrew Morton
2004-11-11 11:29 ` David Howells
2004-11-11 11:43 ` Andrew Morton
2004-11-11 12:03 ` David Howells [this message]
2004-11-11 22:31 ` Andrew Morton
2004-11-12 10:33 ` David Howells
2004-11-12 10:38 ` Andrew Morton
2004-11-12 11:05 ` David Howells
2004-11-14 5:07 ` Linus Torvalds
2004-11-15 13:14 ` David Howells
2004-11-15 15:35 ` Linus Torvalds
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