Re: page_referenced() and VM_LOCKED

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

On Sat, 17 Nov 2007 09:32:36 +0900 (JST)
kamezawa.hiroyu@jp.fujitsu.com wrote:

> >> > I would've thought the point was to treat locked pages as active, never
> >> > pushing them into the inactive list, but since that's not quite what's
> >> > happening I was hoping someone could give me a clue.
> >
> >Rik and Lee and others have proposed that we keep VM_LOCKED pages
> >off both active and inactive lists: that seems a better way forward.
> >
> agreed.
> 
> >> Then, "VM_LOCKED & not referenced" anon page is added to swap cache
> >> (before pushed back to active list)
> >> 
> >> Seems intended ?
> >
> >Not intended, no.  Rather a waste of swap.  How about this patch?
> >
> seems nice. I'd like to do some test in the next week,
> 
your patch helps the kernel to avoid a waste of Swap.

Tested-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

==
I tested your patch on x86_64/6GiB memory, + 2.6.24-rc3.
mlock 5GiB and create 4GiB file by"dd".

[before patch]
MemTotal:      6072620 kB
MemFree:         50540 kB
Buffers:          4508 kB
Cached:         724828 kB
SwapCached:    5146960 kB
Active:        2683964 kB
Inactive:      3198752 kB

[after patch]
MemTotal:      6072620 kB
MemFree:         17112 kB
Buffers:          6816 kB
Cached:         744880 kB
SwapCached:      21724 kB
Active:        5175828 kB
Inactive:       744956 kB

Thanks,
-Kame

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