From: Jeff Dike <jdike@addtoit.com>
To: Davide Libenzi <davidel@xmailserver.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [RFC] /dev/anon
Date: Wed, 14 Jan 2004 09:41:31 -0500 [thread overview]
Message-ID: <20040114144131.GA6407@ccure.user-mode-linux.org> (raw)
In-Reply-To: <Pine.LNX.4.44.0401131817121.12810-100000@bigblue.dev.mdolabs.com>
On Tue, Jan 13, 2004 at 08:46:23PM -0800, Davide Libenzi wrote:
> What do you mean for throw out data? If you mean writing DONTNEED'ed
> dirty pages to the backed up file and release them to the page cache, it
> does.
Writing dirty pages to backing store isn't throwing them out.
> If you mean stop handling page faults inside the DONTNEED'ed region,
> it does not.
This is kind of moot since the region won't be mapped anywhere, so there
can't be page faults on it.
> If you mean zero-filling (ala ftruncate()) the DONTNEED'ed
> region, it obviously does not.
Yes, I mean this, as a side-effect of dropping the region as though it were
clean.
> I thought your goal was to release memory
> to the host, that's why I proposed sys_madvise(MADV_DONTNEED).
It is, I want memory released immediately as though it were clean, and
MADV_DONTNEED doesn't help.
Jeff
next prev parent reply other threads:[~2004-01-14 14:20 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-13 20:21 [RFC] /dev/anon Jeff Dike
2004-01-13 20:38 ` Davide Libenzi
2004-01-14 1:42 ` Jeff Dike
2004-01-14 4:46 ` Davide Libenzi
2004-01-14 5:18 ` Nuno Silva
2004-01-14 14:41 ` Jeff Dike [this message]
2004-01-14 18:23 ` Davide Libenzi
2004-01-14 22:32 ` Andrew Morton
2004-01-14 22:45 ` Davide Libenzi
2004-01-16 12:16 ` Geert Uytterhoeven
2004-01-16 16:02 ` Andries Brouwer
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