linux-kernel - [PATCH 15/16] powerpc/mm: Add support for SPF events

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Date:   Tue,  8 Aug 2017 16:35:48 +0200
From:   Laurent Dufour <ldufour@...ux.vnet.ibm.com>
To:     paulmck@...ux.vnet.ibm.com, peterz@...radead.org,
        akpm@...ux-foundation.org, kirill@...temov.name,
        ak@...ux.intel.com, mhocko@...nel.org, dave@...olabs.net,
        jack@...e.cz, Matthew Wilcox <willy@...radead.org>,
        benh@...nel.crashing.org, mpe@...erman.id.au, paulus@...ba.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, hpa@...or.com,
        Will Deacon <will.deacon@....com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        haren@...ux.vnet.ibm.com, khandual@...ux.vnet.ibm.com,
        npiggin@...il.com, bsingharora@...il.com,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        linuxppc-dev@...ts.ozlabs.org, x86@...nel.org
Subject: [PATCH 15/16] powerpc/mm: Add support for SPF events

Add support for the new speculative page faults software events.

Signed-off-by: Laurent Dufour <ldufour@...ux.vnet.ibm.com>
---
 arch/powerpc/mm/fault.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index c6cd40901dd0..112c4bc9da70 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -306,8 +306,13 @@ int do_page_fault(struct pt_regs *regs, unsigned long address,
 			flags |= FAULT_FLAG_WRITE;
 
 		fault = handle_speculative_fault(mm, address, flags);
-		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);
 
 		/*
 		 * Resetting flags since the following code assumes
-- 
2.7.4