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Commit 5f6f5580 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

perf top: Handle kptr_restrict 



Reported-by: default avatarIngo Molnar <mingo@elte.hu>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
Link: http://lkml.kernel.org/n/tip-cyl5zmi1nu35vyu7l5im2pyv@git.kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 59fb1ee9

tools/perf/builtin-top.c

+15 −0
Original line number Diff line number Diff line
@@ -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