linux-kernel - [PATCH v21 09/19] perf, tools: Add override support for event list CPUID

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Date:   Thu, 15 Sep 2016 15:24:46 -0700
From:   Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     peterz@...radead.org, maddy@...ux.vnet.ibm.com,
        linuxppc-dev@...ts.ozlabs.org, <linux-kernel@...r.kernel.org>
Subject: [PATCH v21 09/19] perf, tools: Add override support for event list CPUID

From: Andi Kleen <ak@...ux.intel.com>

Add a PERF_CPUID variable to override the CPUID of the current CPU (within
the current architecture). This is useful for testing, so that all event
lists can be tested on a single system.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Acked-by: Jiri Olsa <jolsa@...hat.com>
Acked-by: Ingo Molnar <mingo@...nel.org>
---

v2: Fix double free in earlier version.
    Print actual CPUID being used with verbose option.
---
 tools/perf/util/pmu.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index cb4c215..2291d2a 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -501,10 +501,16 @@ static int pmu_add_cpu_aliases(struct list_head *head)
 	struct pmu_event *pe;
 	char *cpuid;
 
-	cpuid = get_cpuid_str();
+	cpuid = getenv("PERF_CPUID");
+	if (cpuid)
+		cpuid = strdup(cpuid);
+	if (!cpuid)
+		cpuid = get_cpuid_str();
 	if (!cpuid)
 		return 0;
 
+	pr_debug("Using CPUID %s\n", cpuid);
+
 	i = 0;
 	while (1) {
 		map = &pmu_events_map[i++];
-- 
1.8.3.1