From: tip-bot for Andi Kleen <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: mingo@kernel.org, tglx@linutronix.de,
linux-kernel@vger.kernel.org, acme@redhat.com, hpa@zytor.com,
jolsa@kernel.org, denis.bakhvalov@intel.com, ak@linux.intel.com
Subject: [tip:perf/urgent] perf script: Fix off by one in brstackinsn IPC computation
Date: Tue, 23 Jul 2019 14:47:47 -0700 [thread overview]
Message-ID: <tip-dde4e732a5b02fa5599c2c0e6c48a0c11789afc4@git.kernel.org> (raw)
In-Reply-To: <20190711181922.18765-2-andi@firstfloor.org>
Commit-ID: dde4e732a5b02fa5599c2c0e6c48a0c11789afc4
Gitweb: https://git.kernel.org/tip/dde4e732a5b02fa5599c2c0e6c48a0c11789afc4
Author: Andi Kleen <ak@linux.intel.com>
AuthorDate: Thu, 11 Jul 2019 11:19:21 -0700
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 23 Jul 2019 08:59:37 -0300
perf script: Fix off by one in brstackinsn IPC computation
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>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20190711181922.18765-2-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.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 8f24865596af..0140ddb8dd0b 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);
next prev parent reply other threads:[~2019-07-23 21:47 UTC|newest]
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 ` [PATCH 2/3] perf script: Fix off by one in brstackinsn IPC computation Andi Kleen
2019-07-16 18:44 ` Arnaldo Carvalho de Melo
2019-07-23 21:47 ` tip-bot for Andi Kleen [this message]
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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