Re: [Lhms-devel] Re: [PATCH 0/5] Reducing fragmentation using zones

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

Joel Schopp wrote:
> > Benchmark comparison between -mm+NoOOM tree and with the new zones
>
> I know you had also previously posted a very simplified version of your 
> real fragmentation avoidance patches.  I was curious if you could repost 
> those with the other benchmarks for a 3 way comparison.  The simplified 
> version got rid of a lot of the complexity people were complaining about 
> and in my mind still seems like preferable direction.
I agree. I think you should try with simplified version again.
Then, we can discuss.

 I don't like using bitmap which I removed (T.T

> Zone based approaches are runtime inflexible and require boot time 
> tuning by the sysadmin.  There are lots of workloads that "reasonable" 
> defaults for a zone based approach would cause the system to regress 
> terribly.
IMHO, I don't like automatic runtime tuning, you say 'flexible' here.
I think flexibility allows 2^(MAX_ORDER - 1) size fragmentaion.
When SECTION_SIZE > MAX_ORDER, this is terrible.

I love certainty that sysadmin can grap his system at boot-time.
And, for people who want to remove range of memory, list-based approach will
need some other hook and its flexibility is of no use.
(If list-based approach goes, I or someone will do.)

I know zone->zone_start_pfn can be removed very easily.
This means there is possiblity to reconfigure zone on demand and
zone-based approach can be a bit more fliexible.


- Kame

> -Joel
>
>
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