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,
Adrian Hunter <adrian.hunter@intel.com>,
Andi Kleen <ak@linux.intel.com>, Jiri Olsa <jolsa@redhat.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: [PATCH 22/22] perf script: Fix invalid LBR/binary mismatch error
Date: Thu, 28 Nov 2019 10:40:27 -0300 [thread overview]
Message-ID: <20191128134027.23726-23-acme@kernel.org> (raw)
In-Reply-To: <20191128134027.23726-1-acme@kernel.org>
From: Adrian Hunter <adrian.hunter@intel.com>
The 'len' returned by grab_bb() includes an extra MAXINSN bytes to allow
for the last instruction, so the the final 'offs' will not be 'len'.
Fix the error condition logic accordingly.
Before:
$ perf record -e '{intel_pt//,cpu/mem_inst_retired.all_loads,aux-sample-size=8192/pp}:u' grep -rqs jhgjhg /boot
[ perf record: Woken up 19 times to write data ]
[ perf record: Captured and wrote 2.274 MB perf.data ]
$ perf script -F +brstackinsn --xed --itrace=i1usl100 | head
grep 13759 [002] 8091.310257: 1862 instructions:uH: 5641d58069eb bmexec+0x86b (/bin/grep)
bmexec+2485:
00005641d5806b35 jnz 0x5641d5806bd0 # MISPRED
00005641d5806bd0 movzxb (%r13,%rdx,1), %eax
00005641d5806bd6 add %rdi, %rax
00005641d5806bd9 movzxb -0x1(%rax), %edx
00005641d5806bdd cmp %rax, %r14
00005641d5806be0 jnb 0x5641d58069c0 # MISPRED
mismatch of LBR data and executable
00005641d58069c0 movzxb (%r13,%rdx,1), %edi
After:
$ perf script -F +brstackinsn --xed --itrace=i1usl100 | head
grep 13759 [002] 8091.310257: 1862 instructions:uH: 5641d58069eb bmexec+0x86b (/bin/grep)
bmexec+2485:
00005641d5806b35 jnz 0x5641d5806bd0 # MISPRED
00005641d5806bd0 movzxb (%r13,%rdx,1), %eax
00005641d5806bd6 add %rdi, %rax
00005641d5806bd9 movzxb -0x1(%rax), %edx
00005641d5806bdd cmp %rax, %r14
00005641d5806be0 jnb 0x5641d58069c0 # MISPRED
00005641d58069c0 movzxb (%r13,%rdx,1), %edi
00005641d58069c6 add %rax, %rdi
Fixes: e98df280bc2a ("perf script brstackinsn: Fix recovery from LBR/binary mismatch")
Reported-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/20191127095631.15663-1-adrian.hunter@intel.com
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 e8db26b9b29e..e2406b291c1c 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1126,7 +1126,7 @@ static int perf_sample__fprintf_brstackinsn(struct perf_sample *sample,
insn++;
}
}
- if (off != (unsigned)len)
+ if (off != end - start)
printed += fprintf(fp, "\tmismatch of LBR data and executable\n");
}
--
2.21.0
next prev parent reply other threads:[~2019-11-28 13:41 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-28 13:40 [GIT PULL] perf/core improvements and fixes Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 01/22] perf script: Move map__fprintf_srccode() to near its only user Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 02/22] perf map: Ditch leftover map__reloc_vmlinux() prototype Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 03/22] perf map: Remove needless struct forward declarations Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 04/22] perf map: Remove unused functions Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 05/22] x86/insn: Add some more Intel instructions to the opcode map Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 06/22] x86/insn: perf tools: Add some more instructions to the new instructions test Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 07/22] perf maps: Merge 'struct maps' with 'struct map_groups' Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 08/22] perf thread: Rename thread->mg to thread->maps Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 09/22] perf addr_location: Rename al->mg to al->maps Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 10/22] perf map_symbol: Rename ms->mg to ms->maps Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 11/22] perf maps: Rename 'mg' variables to 'maps' Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 12/22] perf maps: Rename map_groups.h to maps.h Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 13/22] perf tests: Rename thread-mg-share to thread-maps-share Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 14/22] perf tests: Rename tests/map_groups.c to tests/maps.c Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 15/22] perf tools: Allow to link with libbpf dynamicaly Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 16/22] perf diff: Use llabs() with 64-bit values Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 17/22] " Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 18/22] perf regs: Make perf_reg_name() return "unknown" instead of NULL Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 19/22] perf pmu: Use file system cache to optimize sysfs access Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 20/22] perf affinity: Add infrastructure to save/restore affinity Arnaldo Carvalho de Melo
2019-11-28 13:40 ` [PATCH 21/22] perf script: Fix brstackinsn for AUXTRACE Arnaldo Carvalho de Melo
2019-11-28 13:40 ` Arnaldo Carvalho de Melo [this message]
2019-11-29 5:58 ` [GIT PULL] perf/core improvements and fixes Ingo Molnar
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