Messages in this thread | | | Subject | Re: [PATCH] x86/mm/pti: in pti_clone_pgtable() don't increase addr by PUD_SIZE | From | Dave Hansen <> | Date | Tue, 20 Aug 2019 07:18:06 -0700 |
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On 8/20/19 7:14 AM, Song Liu wrote: >> *But*, that shouldn't get hit on a Skylake CPU since those have PCIDs >> and shouldn't have a global kernel image. Could you confirm whether >> PCIDs are supported on this CPU? > Yes, pcid is listed in /proc/cpuinfo.
So what's going on? Could you confirm exactly which pti_clone_pgtable() is causing you problems? Do you have a theory as to why this manifests as a performance problem rather than a functional one?
A diff of these:
/sys/kernel/debug/page_tables/current_user /sys/kernel/debug/page_tables/current_kernel
before and after your patch might be helpful.
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