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[PATCH 14/16] x86/mm: Add support for SPF events

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  [PATCH 14/16] x86/mm: Add support for SPF events Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-08-08 16:40 +0200

#1706609 — [PATCH 14/16] x86/mm: Add support for SPF events

Add support for the new speculative page faults software events.

Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
---
 arch/x86/mm/fault.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 46fb9c2a832d..17985f11b9da 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -1374,8 +1374,12 @@ __do_page_fault(struct pt_regs *regs, unsigned long error_code,
 		 * requires the vma pointer to be set. So in that case,
 		 * we fall through the normal path.
 		 */
-		if (!(fault & VM_FAULT_RETRY || fault & VM_FAULT_ERROR))
+		if (!(fault & VM_FAULT_RETRY || fault & VM_FAULT_ERROR)) {
+			perf_sw_event(PERF_COUNT_SW_SPF_DONE, 1,
+				      regs, address);
 			goto done;
+		}
+		perf_sw_event(PERF_COUNT_SW_SPF_FAILED, 1, regs, address);
 	}
 
 	/*
-- 
2.7.4

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