Messages in this thread | | | From | Miles Chen <> | Subject | Re: [PATCH] iommu/iova: Improve 32-bit free space estimate | Date | Sat, 5 Mar 2022 08:03:37 +0800 |
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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.
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