* Dirty Page cache in 2.4
@ 2001-11-06 2:55 David Chow
2001-11-06 3:04 ` Mike Fedyk
0 siblings, 1 reply; 2+ messages in thread
From: David Chow @ 2001-11-06 2:55 UTC (permalink / raw)
To: linux-kernel
Dear all,
I've heard the memory management in 2.4 swap out dirty pages. Is it true
that dirty pages refer to the dirty pages of page cache and they may
also be swapped out? Thanks.
regards,
David Chow
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Dirty Page cache in 2.4
2001-11-06 2:55 Dirty Page cache in 2.4 David Chow
@ 2001-11-06 3:04 ` Mike Fedyk
0 siblings, 0 replies; 2+ messages in thread
From: Mike Fedyk @ 2001-11-06 3:04 UTC (permalink / raw)
To: David Chow; +Cc: linux-kernel
On Tue, Nov 06, 2001 at 10:55:57AM +0800, David Chow wrote:
> Dear all,
>
> I've heard the memory management in 2.4 swap out dirty pages. Is it true
> that dirty pages refer to the dirty pages of page cache and they may
> also be swapped out? Thanks.
>
No, very untrue.
To be more specific, there are dirty filesystem cache pages, and dirty
application pages. Dirty filesystem pages will be written to the FS, while
dirty application pages will be swapped out.
If an application page is chosen for swap out and it is not dirty, the VM
will just discard that page completely because it can beloaded from the app
or library on disk when needed again...
BTW, both VMs would do this. This behavior is very fundamental to VM design.
Mike
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2001-11-06 3:04 ` Mike Fedyk
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