From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Ingo Molnar <mingo@kernel.org>, Thomas Gleixner <tglx@linutronix.de>
Cc: Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
Clark Williams <williams@redhat.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Andi Kleen <ak@linux.intel.com>,
Denis Bakhvalov <denis.bakhvalov@intel.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: [PATCH 18/37] perf script: Fix off by one in brstackinsn IPC computation
Date: Mon, 22 Jul 2019 14:38:20 -0300 [thread overview]
Message-ID: <20190722173839.22898-19-acme@kernel.org> (raw)
In-Reply-To: <20190722173839.22898-1-acme@kernel.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>
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);
--
2.21.0
next prev parent reply other threads:[~2019-07-22 17:40 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-22 17:38 [GIT PULL] perf/core improvements and fixes Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 01/37] perf include bpf: Add bpf_tail_call() prototype Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 02/37] perf bpf: Do not attach a BPF prog to a tracepoint if its name starts with ! Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 03/37] perf evsel: Store backpointer to attached bpf_object Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 04/37] perf trace: Add pointer to BPF object containing __augmented_syscalls__ Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 05/37] perf trace: Look up maps just on the __augmented_syscalls__ BPF object Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 06/37] perf trace: Order -e syscalls table Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 07/37] perf trace: Add BPF handler for unaugmented syscalls Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 08/37] perf trace: Allow specifying the bpf prog to augment specific syscalls Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 09/37] perf trace: Put the per-syscall entry/exit prog_array BPF map infrastructure in place Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 10/37] perf trace: Handle raw_syscalls:sys_enter just like the BPF_OUTPUT augmented event Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 11/37] perf augmented_raw_syscalls: Add handler for "openat" Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 12/37] perf augmented_raw_syscalls: Switch to using BPF_MAP_TYPE_PROG_ARRAY Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 13/37] perf augmented_raw_syscalls: Support copying two string syscall args Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 14/37] perf trace: Look for default name for entries in the syscalls prog array Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 15/37] perf augmented_raw_syscalls: Rename augmented_args_filename to augmented_args_payload Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 16/37] perf script: Fix --max-blocks man page description Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 17/37] perf script: Improve man page description of metrics Arnaldo Carvalho de Melo
2019-07-22 17:38 ` Arnaldo Carvalho de Melo [this message]
2019-07-22 17:38 ` [PATCH 19/37] perf tools: Fix proper buffer size for feature processing Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 20/37] perf stat: Fix segfault for event group in repeat mode Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 21/37] perf augmented_raw_syscalls: Augment sockaddr arg in 'connect' Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 22/37] perf trace beauty: Make connect's addrlen be printed as an int, not hex Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 23/37] perf trace beauty: Disable fd->pathname when close() not enabled Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 24/37] perf trace beauty: Do not try to use the fd->pathname beautifier for bind/connect fd arg Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 25/37] perf trace beauty: Beautify 'sendto's sockaddr arg Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 26/37] perf trace beauty: Beautify bind's " Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 27/37] perf stat: Always separate stalled cycles per insn Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 28/37] perf session: Fix loading of compressed data split across adjacent records Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 29/37] perf trace beauty: Add BPF augmenter for the 'rename' syscall Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 30/37] perf trace: Forward error codes when trying to read syscall info Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 31/37] perf trace: Mark syscall ids that are not allocated to avoid unnecessary error messages Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 32/37] perf trace: Preallocate the syscall table Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 33/37] perf trace: Reuse BPF augmenters from syscalls with similar args signature Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 34/37] perf trace: Add "sendfile64" alias to the "sendfile" syscall Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 35/37] perf probe: Set pev->nargs to zero after freeing pev->args entries Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 36/37] perf probe: Avoid calling freeing routine multiple times for same pointer Arnaldo Carvalho de Melo
2019-07-22 17:38 ` [PATCH 37/37] perf build: Do not use -Wshadow on gcc < 4.8 Arnaldo Carvalho de Melo
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