> It shouldn't be difficult to use section mappings with my patch, I just > don't really see the need to try to optimise TLB pressure when you're > running with KASAN enabled which already has something like a 3x slowdown > afaik. If it ends up being a big deal, we can always do that later, but > my main aim here is to divorce kasan from vmemmap because they should be > completely unrelated. Yes, I understand that kasan makes system slow, but my point is why make it even slower? However, I am OK adding your patch to the series, BTW, symmetric changes will be needed for x86 as well sometime later. > > This certainly doesn't sound right; mapping the shadow with pages shouldn't > lead to problems. I also can't seem to reproduce this myself -- could you > share your full .config and a pointer to the git tree that you're using, > please? Config is attached. I am using my patch series + your patch + today's clone from https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git Also, in a separate e-mail i sent out the qemu arguments. > >> I feel, this patch requires more work, and I am troubled with using >> base pages instead of large pages. > > I'm happy to try fixing this, because I think splitting up kasan and vmemmap > is the right thing to do here. Thank you very much. Pavel
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