Re: [PATCH v7 03/14] x86/cet/ibt: Add IBT legacy code bitmap setup function
From: Dave Hansen <hidden>
Date: 2019-06-10 22:02:49
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On 6/10/19 1:58 PM, Yu-cheng Yu wrote:
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On each memory request, the kernel then must consider a percentage of allocated space in its calculation, and on systems with less memory this quickly becomes a problem.I'm not sure what you're referring to here? Are you referring to our overcommit limits?Yes.
My assumption has always been that these large, potentially sparse hardware tables *must* be mmap()'d with MAP_NORESERVE specified. That should keep them from being problematic with respect to overcommit.