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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