Re: [dm-devel] Re: dm-ioband + bio-cgroup benchmarks

On Fri, 19 Sep 2008 22:18:01 -0700
Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx> wrote:

Kamezawa-San, I am not dead against it, but I would provide a knob/control point
for system administrator to decide if movement is important for applications,
then let them do so (like force_empty).

make sense.


Anyway what's next for me is
1. fix current discussion to remove page->page_cgroup pointer.
2. reduce locks.

Are you planning on reposting these. I've been trying other approaches at my end

I'll post in next Monday. It's obvious that I should do more tests/fixes...
About performance, I'll give it up at some reasonable point.

1. Use radix tree per-node per-zone
2. Use radix trees only for 32 bit systems
3. Depend on CONFIG_HAVE_MEMORY_PRESENT and build a sparse data structure and
use pre-allocation

I've posted (1) and I'll take a look at your patches as well

My patch has (many) bugs. Severals are fixed but there will be still ;)
SwapCache beats me again because it easily reuse uncharged pages...

BTW why do you like radix-tree ? It's not very good for our purpose.
FLATMEM support for small system will be easy work.

3. support swap and swap-cache.

I think algorithm for (1), (2) is now getting smart.


Yes, it is getting better


Thanks,
-Kame

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