linux-kernel - [RFC] perf x86 intel: Question about pebs_data

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Message-ID: <20151109153620.GA11597@krava.xlan>
Date:	Mon, 9 Nov 2015 16:36:20 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <andi@...stfloor.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Don Zickus <dzickus@...hat.com>, Joe Mario <jmario@...hat.com>
Subject: [RFC] perf x86 intel: Question about pebs_data_source data

hi,
I was checking with SDM (September 2015) and I'd like if you
guys could help me with understanding of following array elements

I'm reffering to Table 18-19. Data Source Encoding for Load Latency Record

 - element 5
   SDM says:

   05H L3 HIT. Local or Remote home requests that hit the L3 cache and was
   serviced by another processor core with a cross core snoop where no modified
   copies were found. (clean).

   and we have L3 SNOOP MISS:
     OP_LH | P(LVL, L3)  | P(SNOOP, MISS),   /* 0x05: L3 hit, snoop miss */

   while the SDM indicates HIT

 - element 6
   SDM says:

   L3 HIT. Local or Remote home requests that hit the L3 cache and was serviced
   by another processor core with a cross core snoop where modified copies were
   found. (HITM).
  
   and we have L3 SNOOP HIT:
     OP_LH | P(LVL, L3)  | P(SNOOP, HIT),    /* 0x06: L3 hit, snoop hit */

   while the SDM indicates HITM

I'm probably misunderstanding SDM (wouldn't be the first time) what do I miss?

thanks for comments,
jirka


---
diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c
index 5db1c7755548..000ab82d09e7 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
@@ -57,8 +57,8 @@ static const u64 pebs_data_source[] = {
 	OP_LH | P(LVL, LFB) | P(SNOOP, NONE),	/* 0x02: LFB hit */
 	OP_LH | P(LVL, L2)  | P(SNOOP, NONE),	/* 0x03: L2 hit */
 	OP_LH | P(LVL, L3)  | P(SNOOP, NONE),	/* 0x04: L3 hit */
-	OP_LH | P(LVL, L3)  | P(SNOOP, MISS),	/* 0x05: L3 hit, snoop miss */
-	OP_LH | P(LVL, L3)  | P(SNOOP, HIT),	/* 0x06: L3 hit, snoop hit */
+	OP_LH | P(LVL, L3)  | P(SNOOP, HIT),	/* 0x05: L3 hit, snoop hit */
+	OP_LH | P(LVL, L3)  | P(SNOOP, HITM),	/* 0x06: L3 hit, snoop hitm */
 	OP_LH | P(LVL, L3)  | P(SNOOP, HITM),	/* 0x07: L3 hit, snoop hitm */
 	OP_LH | P(LVL, REM_CCE1) | P(SNOOP, HIT),  /* 0x08: L3 miss snoop hit */
 	OP_LH | P(LVL, REM_CCE1) | P(SNOOP, HITM), /* 0x09: L3 miss snoop hitm*/
--
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