Commit-ID: 5f6f55809758e106eca72c6e01402c8080a88ee8 Gitweb: http://git.kernel.org/tip/5f6f55809758e106eca72c6e01402c8080a88ee8 Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> AuthorDate: Fri, 27 May 2011 11:53:28 -0300 Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> CommitDate: Fri, 27 May 2011 16:02:25 -0300 perf top: Handle kptr_restrict 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 -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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