Messages in this thread | | | From | "Izumi, Taku" <> | Subject | RE: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option | Date | Thu, 10 Dec 2015 05:37:41 +0000 |
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Dear Tony, Xishi,
> >> 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? > > > > As I know, the kernel pages will not allocated from movable zone.
Yes, kernel pages are not allocated from ZONE_MOVABLE.
In this case administrator must review and reconfigure the mirror ratio via "MirrorRequest" EFI variable.
Sincerely, Taku Izumi
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