Messages in this thread | | | From | "Luck, Tony" <> | Subject | RE: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option | Date | Wed, 9 Dec 2015 21:59:17 +0000 |
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> How about add some comment, if mirrored memroy is too small, then the > normal zone is small, so it may be oom. > The mirrored memory is at least 1/64 of whole memory, because struct > pages usually take 64 bytes per page.
1/64th is the absolute lower bound (for the page structures as you say). I expect people will need to configure 10% or more to run any real workloads.
I made the memblock boot time allocator fall back to non-mirrored memory if mirrored memory ran out. What happens in the run time allocator if the non-movable zones run out of pages? Will we allocate kernel pages from movable memory?
-Tony
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