4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Adrian Hunter <adrian.hunter@xxxxxxxxx> commit 242483068b4b9ad02f1653819b6e683577681e0e upstream. In the absence of a fallback, callchains must encode also the callchain context. Do that now there is no fallback. Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx> Reviewed-by: Jiri Olsa <jolsa@xxxxxxxxxx> Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx> Cc: David S. Miller <davem@xxxxxxxxxxxxx> Cc: Leo Yan <leo.yan@xxxxxxxxxx> Cc: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx # 4.19 Link: http://lkml.kernel.org/r/100ea2ec-ed14-b56d-d810-e0a6d2f4b069@xxxxxxxxx Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- tools/perf/util/intel-pt.c | 6 +++-- tools/perf/util/thread-stack.c | 44 ++++++++++++++++++++++++++++++++--------- tools/perf/util/thread-stack.h | 2 - 3 files changed, 40 insertions(+), 12 deletions(-) --- a/tools/perf/util/intel-pt.c +++ b/tools/perf/util/intel-pt.c @@ -763,7 +763,8 @@ static struct intel_pt_queue *intel_pt_a if (pt->synth_opts.callchain) { size_t sz = sizeof(struct ip_callchain); - sz += pt->synth_opts.callchain_sz * sizeof(u64); + /* Add 1 to callchain_sz for callchain context */ + sz += (pt->synth_opts.callchain_sz + 1) * sizeof(u64); ptq->chain = zalloc(sz); if (!ptq->chain) goto out_free; @@ -1159,7 +1160,8 @@ static void intel_pt_prep_sample(struct if (pt->synth_opts.callchain) { thread_stack__sample(ptq->thread, ptq->chain, - pt->synth_opts.callchain_sz, sample->ip); + pt->synth_opts.callchain_sz + 1, + sample->ip, pt->kernel_start); sample->callchain = ptq->chain; } --- a/tools/perf/util/thread-stack.c +++ b/tools/perf/util/thread-stack.c @@ -285,20 +285,46 @@ void thread_stack__free(struct thread *t } } +static inline u64 callchain_context(u64 ip, u64 kernel_start) +{ + return ip < kernel_start ? PERF_CONTEXT_USER : PERF_CONTEXT_KERNEL; +} + void thread_stack__sample(struct thread *thread, struct ip_callchain *chain, - size_t sz, u64 ip) + size_t sz, u64 ip, u64 kernel_start) { - size_t i; + u64 context = callchain_context(ip, kernel_start); + u64 last_context; + size_t i, j; + + if (sz < 2) { + chain->nr = 0; + return; + } - if (!thread || !thread->ts) - chain->nr = 1; - else - chain->nr = min(sz, thread->ts->cnt + 1); + chain->ips[0] = context; + chain->ips[1] = ip; - chain->ips[0] = ip; + if (!thread || !thread->ts) { + chain->nr = 2; + return; + } + + last_context = context; + + for (i = 2, j = 1; i < sz && j <= thread->ts->cnt; i++, j++) { + ip = thread->ts->stack[thread->ts->cnt - j].ret_addr; + context = callchain_context(ip, kernel_start); + if (context != last_context) { + if (i >= sz - 1) + break; + chain->ips[i++] = context; + last_context = context; + } + chain->ips[i] = ip; + } - for (i = 1; i < chain->nr; i++) - chain->ips[i] = thread->ts->stack[thread->ts->cnt - i].ret_addr; + chain->nr = i; } struct call_return_processor * --- a/tools/perf/util/thread-stack.h +++ b/tools/perf/util/thread-stack.h @@ -84,7 +84,7 @@ int thread_stack__event(struct thread *t u64 to_ip, u16 insn_len, u64 trace_nr); void thread_stack__set_trace_nr(struct thread *thread, u64 trace_nr); void thread_stack__sample(struct thread *thread, struct ip_callchain *chain, - size_t sz, u64 ip); + size_t sz, u64 ip, u64 kernel_start); int thread_stack__flush(struct thread *thread); void thread_stack__free(struct thread *thread); size_t thread_stack__depth(struct thread *thread);
