Rik van Riel wrote:
> On large memory systems, the VM can spend way too much time scanning
> through pages that it cannot (or should not) evict from memory. Not
> only does it use up CPU time, but it also provokes lock contention
> and can leave large systems under memory presure in a catatonic state.
>
Hi, Rik,
I remember you mentioning that by large memory systems you mean systems
with at-least 128GB, does this definition still hold?
> This patch series improves VM scalability by:
>
> 1) making the locking a little more scalable
>
> 2) putting filesystem backed, swap backed and non-reclaimable pages
> onto their own LRUs, so the system only scans the pages that it
> can/should evict from memory
>
> 3) switching to SEQ replacement for the anonymous LRUs, so the
> number of pages that need to be scanned when the system
> starts swapping is bound to a reasonable number
>
> The noreclaim patches come verbatim from Lee Schermerhorn and
> Nick Piggin. I have not taken a detailed look at them yet and
> all I have done is fix the rejects against the latest -mm kernel.
>
Is there a consolidate patch available, it makes it easier to test.
> I am posting this series now because I would like to get more
> feedback, while I am studying and improving the noreclaim patches
> myself.
>
What kind of tests show the problem? I'll try and review and test the code.
--
Warm Regards,
Balbir Singh
Linux Technology Center
IBM, ISTL
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