Bernd,
I fact marking REQ_META will help with io scheduler().
I and Andrew will discuss it's some time ago, but don't expect a too much performance improvements
anyway - i will pickup patch from Intel jira and ask performance engineer to evaluate it.
bw. My problem is in memory caching.
I may rewrite a buddy cache to avoid using a page cache at all as these pages but LRU aging will lost.
On Apr 21, 2013, at 00:18, Bernd Schubert wrote:
> Alex, Andrew,
>
> did you notice the patch Ted just sent?
> ("ext4: mark all metadata I/O with REQ_META")
>
> I would like to see a way to mark pages read in with REQ_META to be kept
> in cache preferred over other pages. I guess that would solve LU-15
> (https://jira.hpdd.intel.com/browse/LU-15) and also the direntry-block
> issue I tried to solve about 2 years ago
> (http://patchwork.ozlabs.org/patch/101200/). But using REQ_META to tag
> pages would probably also solve the same issue for other file systems.
> Is there anything already in the mm layer that could be used for that?
>
> Thanks,
> Bernd
>
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