Patches: http://parisc-linux.org/~jejb/md_bitmap/
Thanks, Paul
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Neil Brown wrote:
This is definitely heading in the right direction. However I think you have missed some of the subtleties of plugging.
[snip]
That should then have the bitmap updates happening before the data updates, and should cluster bitmap updates better.
OK, I've fixed that.
The next step would be to stop write_page from being synchronous - I'm not comfortable about ->unplug-fn having to wait for disk io.
Well, it still does have to wait for the bitmap writes to complete before letting the regular writes go, but I see your point about the writes being submitted simultaneously (nearly) rather than being completely serialized.
This looks to be quite awkward as there is not call-back that happens when writeback on a page is completed. You need to have a kernel thread to wait for the pages to complete. I would get the bitmap_daemon to do this.
OK, this is what I've done...there didn't seem to be a better place to do it.
Does that make sense?
Certainly does, and seems to work... - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
