From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932268AbcETGsS (ORCPT ); Fri, 20 May 2016 02:48:18 -0400 Received: from terminus.zytor.com ([198.137.202.10]:50968 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753910AbcETGsQ (ORCPT ); Fri, 20 May 2016 02:48:16 -0400 Date: Thu, 19 May 2016 23:47:17 -0700 From: tip-bot for Arnaldo Carvalho de Melo Message-ID: Cc: vincent.weaver@maine.edu, mhiramat@kernel.org, namhyung@kernel.org, alexander.shishkin@linux.intel.com, ast@kernel.org, acme@redhat.com, lizefan@huawei.com, hekuang@huawei.com, jolsa@redhat.com, linux-kernel@vger.kernel.org, peterz@infradead.org, wangnan0@huawei.com, eranian@google.com, hpa@zytor.com, fweisbec@gmail.com, dsahern@gmail.com, milian.wolff@kdab.com, brendan.d.gregg@gmail.com, adrian.hunter@intel.com, tglx@linutronix.de, mingo@kernel.org Reply-To: milian.wolff@kdab.com, dsahern@gmail.com, fweisbec@gmail.com, eranian@google.com, hpa@zytor.com, wangnan0@huawei.com, peterz@infradead.org, jolsa@redhat.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de, adrian.hunter@intel.com, brendan.d.gregg@gmail.com, alexander.shishkin@linux.intel.com, namhyung@kernel.org, mhiramat@kernel.org, vincent.weaver@maine.edu, hekuang@huawei.com, acme@redhat.com, lizefan@huawei.com, ast@kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/urgent] perf tools: Separate accounting of contexts and real addresses in a stack trace Git-Commit-ID: a29d5c9b8167dbc21a7ca8c0302e3799f9063b4e X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: a29d5c9b8167dbc21a7ca8c0302e3799f9063b4e Gitweb: http://git.kernel.org/tip/a29d5c9b8167dbc21a7ca8c0302e3799f9063b4e Author: Arnaldo Carvalho de Melo AuthorDate: Mon, 16 May 2016 21:16:54 -0300 Committer: Arnaldo Carvalho de Melo CommitDate: Mon, 16 May 2016 23:11:54 -0300 perf tools: Separate accounting of contexts and real addresses in a stack trace The perf_sample->ip_callchain->nr value includes all the entries in the ip_callchain->ip[] array, real addresses and PERF_CONTEXT_{KERNEL,USER,etc}, while what the user expects is that what is in the kernel.perf_event_max_stack sysctl or in the upcoming per event perf_event_attr.sample_max_stack knob be honoured in terms of IP addresses in the stack trace. So match the kernel support and validate chain->nr taking into account both kernel.perf_event_max_stack and kernel.perf_event_max_contexts_per_stack. Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Alexei Starovoitov Cc: Brendan Gregg Cc: David Ahern Cc: Frederic Weisbecker Cc: He Kuang Cc: Jiri Olsa Cc: Masami Hiramatsu Cc: Milian Wolff Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Thomas Gleixner Cc: Vince Weaver Cc: Wang Nan Cc: Zefan Li Link: http://lkml.kernel.org/n/tip-mgx0jpzfdq4uq4abfa40byu0@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/perf.c | 3 +++ tools/perf/util/machine.c | 26 +++++++++++++++++--------- tools/perf/util/util.c | 3 ++- tools/perf/util/util.h | 3 ++- 4 files changed, 24 insertions(+), 11 deletions(-) diff --git a/tools/perf/perf.c b/tools/perf/perf.c index 7970008..15982ce 100644 --- a/tools/perf/perf.c +++ b/tools/perf/perf.c @@ -549,6 +549,9 @@ int main(int argc, const char **argv) if (sysctl__read_int("kernel/perf_event_max_stack", &value) == 0) sysctl_perf_event_max_stack = value; + if (sysctl__read_int("kernel/perf_event_max_contexts_per_stack", &value) == 0) + sysctl_perf_event_max_contexts_per_stack = value; + cmd = extract_argv0_path(argv[0]); if (!cmd) cmd = "perf-help"; diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index 18dd96b..7ba9fad 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -1811,9 +1811,9 @@ static int thread__resolve_callchain_sample(struct thread *thread, { struct branch_stack *branch = sample->branch_stack; struct ip_callchain *chain = sample->callchain; - int chain_nr = min(max_stack, (int)chain->nr); + int chain_nr = chain->nr; u8 cpumode = PERF_RECORD_MISC_USER; - int i, j, err; + int i, j, err, nr_entries, nr_contexts; int skip_idx = -1; int first_call = 0; @@ -1828,7 +1828,7 @@ static int thread__resolve_callchain_sample(struct thread *thread, * Based on DWARF debug information, some architectures skip * a callchain entry saved by the kernel. */ - if (chain->nr < sysctl_perf_event_max_stack) + if (chain_nr < sysctl_perf_event_max_stack) skip_idx = arch_skip_callchain_idx(thread, chain); /* @@ -1889,12 +1889,8 @@ static int thread__resolve_callchain_sample(struct thread *thread, } check_calls: - if (chain->nr > sysctl_perf_event_max_stack && (int)chain->nr > max_stack) { - pr_warning("corrupted callchain. skipping...\n"); - return 0; - } - - for (i = first_call; i < chain_nr; i++) { + for (i = first_call, nr_entries = 0, nr_contexts = 0; + i < chain_nr && nr_entries < max_stack; i++) { u64 ip; if (callchain_param.order == ORDER_CALLEE) @@ -1908,6 +1904,14 @@ check_calls: #endif ip = chain->ips[j]; + if (ip >= PERF_CONTEXT_MAX) { + if (++nr_contexts > sysctl_perf_event_max_contexts_per_stack) + goto out_corrupted_callchain; + } else { + if (++nr_entries > sysctl_perf_event_max_stack) + goto out_corrupted_callchain; + } + err = add_callchain_ip(thread, cursor, parent, root_al, &cpumode, ip); if (err) @@ -1915,6 +1919,10 @@ check_calls: } return 0; + +out_corrupted_callchain: + pr_warning("corrupted callchain. skipping...\n"); + return 0; } static int unwind_entry(struct unwind_entry *entry, void *arg) diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c index eab077a..23504ad 100644 --- a/tools/perf/util/util.c +++ b/tools/perf/util/util.c @@ -33,7 +33,8 @@ struct callchain_param callchain_param = { unsigned int page_size; int cacheline_size; -unsigned int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH; +int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH; +int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK; bool test_attr__enabled; diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h index 7651633..1e8c316 100644 --- a/tools/perf/util/util.h +++ b/tools/perf/util/util.h @@ -261,7 +261,8 @@ void sighandler_dump_stack(int sig); extern unsigned int page_size; extern int cacheline_size; -extern unsigned int sysctl_perf_event_max_stack; +extern int sysctl_perf_event_max_stack; +extern int sysctl_perf_event_max_contexts_per_stack; struct parse_tag { char tag;