linux-kernel - [PATCH V5 01/16] perf tools: Disallow PMU events intel_pt and intel

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Message-Id: <1432295653-13989-2-git-send-email-adrian.hunter@intel.com>
Date:	Fri, 22 May 2015 14:53:58 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...hat.com>
Subject: [PATCH V5 01/16] perf tools: Disallow PMU events intel_pt and intel_bts until there is support

Disallow PMU events intel_pt and intel_bts until the tools
support them. By default any PMU is selectable as an event
but until the tools have intel_pt and intel_bts support
using them would result in no data being recorded without
any indication as to why.

Before the change:

    $ perf record -e intel_bts// sleep 1
    [ perf record: Woken up 1 times to write data ]
    [ perf record: Captured and wrote 0.008 MB perf.data ]
    $ perf report --stdio
    Error:
    The perf.data file has no samples!

After the change:

    $ perf record -e intel_bts// sleep 1
    invalid or unsupported event: 'intel_bts//'
    Run 'perf list' for a list of valid events

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/util/pmu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 244c66f..5d3ab7c 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -442,6 +442,10 @@ static struct perf_pmu *pmu_lookup(const char *name)
 	LIST_HEAD(aliases);
 	__u32 type;
 
+	/* No support for intel_bts or intel_pt so disallow them */
+	if (!strcmp(name, "intel_bts") || !strcmp(name, "intel_pt"))
+		return NULL;
+
 	/*
 	 * The pmu data we store & need consists of the pmu
 	 * type value and format definitions. Load both right
-- 
1.9.1

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