Hi again,
Reread what I had written.
One documentation error.
Roger Larsson wrote:
>
> Hi,
>
> Another attempt.
>
> With this patch I get noticeable improvements in streaming write +16%!
> (streaming write throughput is close to streaming read :-)
>
> dbench results are mixed - slightly worse than plain test5-1...
> It now survives mmap002, as opposed to vmfix-2.x :-) there were
> bugs of cause.
>
> * Basic idea in this patch is to keep free pages of zones in the
> range [pages_high ... pages_low].
This part:
> Kswapd will only run until
> one zone gets pages_high. In this situation pages from all zones
> are free able.
Should read:
Kswapd will start when all zones have zone_wake_kswapd
(free_pages < pages_low). In this situation pages from all zones are
freeable. Kswapd will run until one zone drops zone_wake_kswapd
(free_pages > pages_high).
> * In addition kswapd will run if any zone has less than pages_low.
>
> * Actually implemented by using three values in zone_wake_kswapd
> 0 = zone initially above pages_high, allocs allowed until zone
> gets < pages_low
> 1 = zone < pages_low
> -1 = additional alloc done after zone become < pages_low
> Most of the time there will only be one zone to with
> zone_wake_kswapd zero. This zone will get the allocs until it
> also gets < pages_low, then kswapd starts and runs until any
> zone gets > pages_high - it will probably be another zone. Now
> that one gets the allocs, ...
>
> * There are some additional stuff that needs cleaning / further
> investigations.
>
> /RogerL
>
> --
> Home page:
> http://www.norran.net/nra02596/
>
> ------------------------------------------------------------------------
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> patch-2.4.0-test5-1-vmfix.30 Type: Plain Text (text/plain)
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