From: Helge Hafting <helgehaf@aitel.hist.no>
To: Amir Hermelin <amir@montilio.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: how do file-mapped (mmapped) pages become dirty?
Date: Tue, 28 Oct 2003 16:00:53 +0100 [thread overview]
Message-ID: <3F9E84A5.2060500@aitel.hist.no> (raw)
In-Reply-To: <006901c39d50$0b1313d0$2501a8c0@CARTMAN>
Amir Hermelin wrote:
> Hi,
> When a process mmaps a file, how does the kernel know the memory has been
> written to (and hence the page is dirty)? Is this done by setting the
> protected flag, and when the memory is first written to it's set to dirty?
No need on a i386. The cpu sets the page dirty in the pagetables
when it is written to. It doesn't matter what kind of page
it is.
> What function is responsible for this setting? And when will the page be
> written back to disk (i.e. where's the flusher located)?
>
When there's memory pressure, or a sync.
Helge Hafting
next prev parent reply other threads:[~2003-10-28 14:51 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-28 12:35 Amir Hermelin
2003-10-28 15:00 ` Helge Hafting [this message]
2003-10-28 15:26 ` Chris Friesen
2003-10-28 15:45 ` Richard B. Johnson
2003-10-28 16:23 ` Chris Friesen
2003-10-28 15:39 ` Richard B. Johnson
2003-10-28 18:07 ` bill davidsen
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