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From: Andi Kleen <andi@firstfloor.org>
To: acme@kernel.org
Cc: jolsa@kernel.org, linux-kernel@vger.kernel.org,
	linux-perf-users@vger.kernel.org, Andi Kleen <ak@linux.intel.com>,
	Denis Bakhvalov <denis.bakhvalov@intel.com>
Subject: [PATCH 2/3] perf script: Fix off by one in brstackinsn IPC computation
Date: Thu, 11 Jul 2019 11:19:21 -0700
Message-ID: <20190711181922.18765-2-andi@firstfloor.org> (raw)
In-Reply-To: <20190711181922.18765-1-andi@firstfloor.org>

From: Andi Kleen <ak@linux.intel.com>

When we hit the end of a program block, need to count the last instruction
too for the IPC computation. This caused large errors for small blocks.

% perf script -b ls / > /dev/null

Before:

% perf script -F +brstackinsn --xed
...
        00007f94c9ac70d8                        jz 0x7f94c9ac70e3                       # PRED 3 cycles [36] 4.33 IPC
        00007f94c9ac70e3                        testb  $0x20, 0x31d(%rbx)
        00007f94c9ac70ea                        jnz 0x7f94c9ac70b0
        00007f94c9ac70ec                        testb  $0x8, 0x205ad(%rip)
        00007f94c9ac70f3                        jz 0x7f94c9ac6ff0               # PRED 1 cycles [37] 3.00 IPC

After:

% perf script -F +brstackinsn --xed
...
        00007f94c9ac70d8                        jz 0x7f94c9ac70e3                       # PRED 3 cycles [15] 4.67 IPC
        00007f94c9ac70e3                        testb  $0x20, 0x31d(%rbx)
        00007f94c9ac70ea                        jnz 0x7f94c9ac70b0
        00007f94c9ac70ec                        testb  $0x8, 0x205ad(%rip)
        00007f94c9ac70f3                        jz 0x7f94c9ac6ff0               # PRED 1 cycles [16] 4.00 IPC

Suggested-by: Denis Bakhvalov <denis.bakhvalov@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 tools/perf/builtin-script.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 2f6232f1bfdc..9a63cb3442a9 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1059,7 +1059,7 @@ static int perf_sample__fprintf_brstackinsn(struct perf_sample *sample,
 
 			printed += ip__fprintf_sym(ip, thread, x.cpumode, x.cpu, &lastsym, attr, fp);
 			if (ip == end) {
-				printed += ip__fprintf_jump(ip, &br->entries[i], &x, buffer + off, len - off, insn, fp,
+				printed += ip__fprintf_jump(ip, &br->entries[i], &x, buffer + off, len - off, ++insn, fp,
 							    &total_cycles);
 				if (PRINT_FIELD(SRCCODE))
 					printed += print_srccode(thread, x.cpumode, ip);
-- 
2.20.1


  reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-11 18:19 [PATCH 1/3] perf script: Fix --max-blocks man page description Andi Kleen
2019-07-11 18:19 ` Andi Kleen [this message]
2019-07-16 18:44   ` [PATCH 2/3] perf script: Fix off by one in brstackinsn IPC computation Arnaldo Carvalho de Melo
2019-07-23 21:47   ` [tip:perf/urgent] " tip-bot for Andi Kleen
2019-07-11 18:19 ` [PATCH 3/3] perf script: Improve man page description of metrics Andi Kleen
2019-07-16 18:45   ` Arnaldo Carvalho de Melo
2019-07-23 21:47   ` [tip:perf/urgent] " tip-bot for Andi Kleen
2019-07-16 18:43 ` [PATCH 1/3] perf script: Fix --max-blocks man page description Arnaldo Carvalho de Melo
2019-07-23 21:46 ` [tip:perf/urgent] " tip-bot for Andi Kleen

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