Hi Joerg, Robin,
Applied without stable tag for now. If needed, please consider re-sending it for stable when this patch is merged upstream.
Yeah, having figured out the history, I ended up with the opinion that it was a missed corner-case optimisation opportunity, rather than an actual error with respect to intent or implementation, so I intentionally left that out. Plus figuring out an exact Fixes tag might be tricky - as above I reckon it probably only started to become significant somwehere around 5.11 or so.
All of these various levels of retry mechanisms are only a best-effort thing, and ultimately if you're making large allocations from a small space there are always going to be *some* circumstances that still manage to defeat them. Over time, we've made them try harder, but that fact that we haven't yet made them try hard enough to work well for a particular use-case does not constitute a bug. However as Joerg says, anyone's welcome to make a case to Greg to backport a mainline commit if it's a low-risk change with significant benefit to real-world stable kernel users.
Got it, thank you. We will try to push to the android LTS trees we need.
Thanks, Miles
Thanks all!
Robin.