[PATCH 4/5] perf top: Handle kptr_restrict
From: Arnaldo Carvalho de Melo
Date: Fri May 27 2011 - 17:46:12 EST
From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Reported-by: Ingo Molnar <mingo@xxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Tom Zanussi <tzanussi@xxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-cyl5zmi1nu35vyu7l5im2pyv@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/builtin-top.c | 15 +++++++++++++++
1 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 375ed16..472f627 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -80,6 +80,7 @@ static bool use_tui, use_stdio;
static int default_interval = 0;
+static bool kptr_restrict_warned;
static bool inherit = false;
static int realtime_prio = 0;
static bool group = false;
@@ -738,6 +739,20 @@ static void perf_event__process_sample(const union perf_event *event,
al.filtered)
return;
+ if (!kptr_restrict_warned &&
+ symbol_conf.kptr_restrict &&
+ al.cpumode == PERF_RECORD_MISC_KERNEL) {
+ ui__warning(
+"Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
+"Check /proc/sys/kernel/kptr_restrict.\n\n"
+"Kernel%s samples will not be resolved.\n",
+ !RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]) ?
+ " modules" : "");
+ if (use_browser <= 0)
+ sleep(5);
+ kptr_restrict_warned = true;
+ }
+
if (al.sym == NULL) {
/*
* As we do lazy loading of symtabs we only will know if the
--
1.6.2.5
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