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From: Jin Yao <yao.jin@linux.intel.com>
To: acme@kernel.org, jolsa@kernel.org, peterz@infradead.org,
	mingo@redhat.com, alexander.shishkin@linux.intel.com
Cc: Linux-kernel@vger.kernel.org, ak@linux.intel.com,
	kan.liang@intel.com, yao.jin@intel.com,
	Jin Yao <yao.jin@linux.intel.com>
Subject: [PATCH v3 1/2] perf util: Print al_addr when symbol is not found
Date: Mon, 24 Feb 2020 10:22:24 +0800	[thread overview]
Message-ID: <20200224022225.30264-2-yao.jin@linux.intel.com> (raw)
In-Reply-To: <20200224022225.30264-1-yao.jin@linux.intel.com>

For branch mode, if the symbol is not found, it prints
the address.

For example, 0x0000555eee0365a0 in below output.

Overhead  Command  Source Shared Object  Source Symbol                            Target Symbol
  17.55%  div      libc-2.27.so          [.] __random                             [.] __random
   6.11%  div      div                   [.] 0x0000555eee0365a0                   [.] rand
   6.10%  div      libc-2.27.so          [.] rand                                 [.] 0x0000555eee036769
   5.80%  div      libc-2.27.so          [.] __random_r                           [.] __random
   5.72%  div      libc-2.27.so          [.] __random                             [.] __random_r
   5.62%  div      libc-2.27.so          [.] __random_r                           [.] __random_r
   5.38%  div      libc-2.27.so          [.] __random                             [.] rand
   4.56%  div      libc-2.27.so          [.] __random                             [.] __random
   4.49%  div      div                   [.] 0x0000555eee036779                   [.] 0x0000555eee0365ff
   4.25%  div      div                   [.] 0x0000555eee0365fa                   [.] 0x0000555eee036760

But it's not very easy to understand what the instructions
are in the binary. So this patch uses the al_addr instead.

With this patch, the output is

Overhead  Command  Source Shared Object  Source Symbol                            Target Symbol
  17.55%  div      libc-2.27.so          [.] __random                             [.] __random
   6.11%  div      div                   [.] 0x00000000000005a0                   [.] rand
   6.10%  div      libc-2.27.so          [.] rand                                 [.] 0x0000000000000769
   5.80%  div      libc-2.27.so          [.] __random_r                           [.] __random
   5.72%  div      libc-2.27.so          [.] __random                             [.] __random_r
   5.62%  div      libc-2.27.so          [.] __random_r                           [.] __random_r
   5.38%  div      libc-2.27.so          [.] __random                             [.] rand
   4.56%  div      libc-2.27.so          [.] __random                             [.] __random
   4.49%  div      div                   [.] 0x0000000000000779                   [.] 0x00000000000005ff
   4.25%  div      div                   [.] 0x00000000000005fa                   [.] 0x0000000000000760

Now we can use objdump to dump the object starting from 0x5a0.

For example,
objdump -d --start-address 0x5a0 div

00000000000005a0 <rand@plt>:
 5a0:   ff 25 2a 0a 20 00       jmpq   *0x200a2a(%rip)        # 200fd0 <__cxa_finalize@plt+0x200a20>
 5a6:   68 02 00 00 00          pushq  $0x2
 5ab:   e9 c0 ff ff ff          jmpq   570 <srand@plt-0x10>
 ...

 v2:
 ---
 No change

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
 tools/perf/util/sort.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index ab0cfd790ad0..e860595576c2 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -869,7 +869,8 @@ static int hist_entry__sym_from_snprintf(struct hist_entry *he, char *bf,
 	if (he->branch_info) {
 		struct addr_map_symbol *from = &he->branch_info->from;
 
-		return _hist_entry__sym_snprintf(&from->ms, from->addr, he->level, bf, size, width);
+		return _hist_entry__sym_snprintf(&from->ms, from->al_addr,
+						 he->level, bf, size, width);
 	}
 
 	return repsep_snprintf(bf, size, "%-*.*s", width, width, "N/A");
@@ -881,7 +882,8 @@ static int hist_entry__sym_to_snprintf(struct hist_entry *he, char *bf,
 	if (he->branch_info) {
 		struct addr_map_symbol *to = &he->branch_info->to;
 
-		return _hist_entry__sym_snprintf(&to->ms, to->addr, he->level, bf, size, width);
+		return _hist_entry__sym_snprintf(&to->ms, to->al_addr,
+						 he->level, bf, size, width);
 	}
 
 	return repsep_snprintf(bf, size, "%-*.*s", width, width, "N/A");
-- 
2.17.1


  reply	other threads:[~2020-02-24  2:22 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-24  2:22 [PATCH v3 0/2] perf report: Support annotation of code without symbols Jin Yao
2020-02-24  2:22 ` Jin Yao [this message]
2020-02-24  2:22 ` [PATCH v3 2/2] Support interactive " Jin Yao
2020-02-24 12:35   ` Jiri Olsa
2020-02-24 15:39     ` Jin, Yao
2020-02-24 20:46       ` Jiri Olsa
2020-02-24 13:25   ` Ravi Bangoria
2020-02-24 13:51     ` Jiri Olsa
2020-02-24 14:04       ` Ravi Bangoria
2020-02-24 15:53         ` Jin, Yao
2020-02-24 15:44     ` Jin, Yao
2020-02-24 13:56   ` Ravi Bangoria
2020-02-24 15:46     ` Jin, Yao
2020-02-27 13:50 ` [PATCH v3 0/2] perf report: Support " Arnaldo Carvalho de Melo
2020-02-27 14:47   ` Jin, Yao

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