Re: [RFC Part2 PATCH 07/30] mm: add support to split the large THP based on RMP violation
From: Dave Hansen <hidden>
Date: 2021-03-25 14:31:20
Also in:
linux-crypto, lkml
On 3/24/21 10:04 AM, Brijesh Singh wrote:
quoted hunk ↗ jump to hunk
@@ -1377,6 +1442,22 @@ void do_user_addr_fault(struct pt_regs *regs, if (hw_error_code & X86_PF_INSTR) flags |= FAULT_FLAG_INSTRUCTION; + /* + * If its an RMP violation, see if we can resolve it. + */ + if ((hw_error_code & X86_PF_RMP)) { + ret = handle_rmp_page_fault(hw_error_code, address); + if (ret == RMP_FAULT_PAGE_SPLIT) { + flags |= FAULT_FLAG_PAGE_SPLIT; + } else if (ret == RMP_FAULT_KILL) { + fault |= VM_FAULT_SIGBUS; + mm_fault_error(regs, hw_error_code, address, fault); + return; + } else { + return; + } + }
Won't khugepaged come right back around and coalesce this page again?