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Date: Tue, 8 Aug 2017 16:35:47 +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 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@...ux.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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