linux-kernel - [PATCH v2] perf test powerpc: Fix 'Object code reading' test

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Message-Id: <1504170896-7876-1-git-send-email-ravi.bangoria@linux.vnet.ibm.com>
Date:   Thu, 31 Aug 2017 14:44:56 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
To:     acme@...nel.org
Cc:     peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, namhyung@...nel.org,
        adrian.hunter@...el.com, jolsa@...nel.org,
        linux-kernel@...r.kernel.org, mpe@...erman.id.au,
        linuxppc-dev@...ts.ozlabs.org,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Subject: [PATCH v2] perf test powerpc: Fix 'Object code reading' test

'Object code reading' test always fails on powerpc guest. Two reasons
for the failure are:

1. When elf section is too big (size beyond 'unsigned int' max value).
objdump fails to disassemble from such section. This was fixed with
commit 0f6329bd7fc ("binutils/objdump: Fix disassemble for huge elf
sections") in binutils.

2. When the sample is from hypervisor. Hypervisor symbols can not
be resolved within guest and thus thread__find_addr_map() fails for
such symbols. Fix this by ignoring hypervisor symbols in the test.

Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
---
Changes in v2:
 - Add pr_debug()

 tools/perf/tests/code-reading.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
index 761c5a4..466a462 100644
--- a/tools/perf/tests/code-reading.c
+++ b/tools/perf/tests/code-reading.c
@@ -237,6 +237,11 @@ static int read_object_code(u64 addr, size_t len, u8 cpumode,
 
 	thread__find_addr_map(thread, cpumode, MAP__FUNCTION, addr, &al);
 	if (!al.map || !al.map->dso) {
+		if (cpumode == PERF_RECORD_MISC_HYPERVISOR) {
+			pr_debug("Hypervisor address can not be resolved - skipping\n");
+			return 0;
+		}
+
 		pr_debug("thread__find_addr_map failed\n");
 		return -1;
 	}
-- 
1.8.3.1