[PATCH] D86694: [scudo] Allow -fsanitize=scudo on Linux and Windows (WIP, don't land as is)

[Russell Gallop via Phabricator via llvm-commits]

russell.gallop added a comment.

In D86694#2274383 <https://reviews.llvm.org/D86694#2274383>, @cryptoad wrote:

> In D86694#2273815 <https://reviews.llvm.org/D86694#2273815>, @aganea wrote:
>
>> If 4.4 TB of virtual pages are mapped in each process (this happens on startup), then we quickly exaust the 48-bit (256 TB) addressable space with 72+ programs running (on a 36-core). Any idea where this 4.4 TB mapping comes from?
>
> The size of the Primary is defined in https://github.com/llvm/llvm-project/blob/master/compiler-rt/lib/scudo/scudo_platform.h#L75
> Scudo reserves that size but doesn't commit it, then it incrementally commits when memory is needed within the reserved region.

I guess using scudo as a general purpose allocator that could set a limit on the number of cores that can be used at once as @aganea found. Would there be any problem with making this very small (e.g. a couple of GB)?

Thanks


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