linux-kernel - [tip:perf/urgent] perf test: Remove 'core

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Message-ID: <tip-4c9d6c18fdebfcfb18918a656355a3c7c3d45e13@git.kernel.org>
Date:	Thu, 24 Mar 2016 00:36:36 -0700
From:	tip-bot for Sukadev Bhattiprolu <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	jstancek@...hat.com, sukadev@...ux.vnet.ibm.com, acme@...hat.com,
	jolsa@...hat.com, tglx@...utronix.de, linux-kernel@...r.kernel.org,
	mingo@...nel.org, hpa@...or.com, kan.liang@...el.com
Subject: [tip:perf/urgent] perf test: Remove 'core_id' check in topo test

Commit-ID:  4c9d6c18fdebfcfb18918a656355a3c7c3d45e13
Gitweb:     http://git.kernel.org/tip/4c9d6c18fdebfcfb18918a656355a3c7c3d45e13
Author:     Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
AuthorDate: Thu, 3 Dec 2015 18:26:40 -0500
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 11 Mar 2016 13:45:04 -0300

perf test: Remove 'core_id' check in topo test

The topology test case of 'perf test' seems to be broken on my x86
system - due to the comparison of a "core-id" with # of CPUs online.

There are 8 online CPUs:

	$ cat /sys/devices/system/cpu/online
	0-7

but core-ids are not sequential and some core-ids exceed the number
of online CPUs.

	$ cat /sys/devices/system/cpu/cpu?/topology/core_id
	0
	1
	9
	10
	0
	1
	9
	10

Looks like we can safely remove the check.  Output before:

	$ perf --version
	perf version 4.4.rc1.g34258a

	$ perf test -v topo
	36: Test topology in session                                 :
	--- start ---
	test child forked, pid 5906
	templ file: /tmp/perf-test-vCwWG3
	core_id number is too big.You may need to upgrade the perf tool.
	test child interrupted
	---- end ----
	Test topology in session: FAILED!

and after:

	$ perf test -v topo
	36: Test topology in session                                 :
	--- start ---
	test child forked, pid 6532
	templ file: /tmp/perf-test-y10wFJ
	CPU 0, core 0, socket 0
	CPU 1, core 1, socket 0
	CPU 2, core 9, socket 0
	CPU 3, core 10, socket 0
	CPU 4, core 0, socket 1
	CPU 5, core 1, socket 1
	CPU 6, core 9, socket 1
	CPU 7, core 10, socket 1
	test child finished with 0
	---- end ----
	Test topology in session: Ok

Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc: Jan Stancek <jstancek@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Kan Liang <kan.liang@...el.com>
Link: http://lkml.kernel.org/r/20151203233219.GA27696@us.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/header.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 73e38e4..90680ec 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1872,11 +1872,6 @@ static int process_cpu_topology(struct perf_file_section *section,
 		if (ph->needs_swap)
 			nr = bswap_32(nr);
 
-		if (nr > (u32)cpu_nr) {
-			pr_debug("core_id number is too big."
-				 "You may need to upgrade the perf tool.\n");
-			goto free_cpu;
-		}
 		ph->env.cpu[i].core_id = nr;
 
 		ret = readn(fd, &nr, sizeof(nr));