提交 73c660f3 编写于 作者: A Adrian Hunter 提交者: Greg Kroah-Hartman

perf intel-pt: Insert callchain context into synthesized callchains

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: NAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: NJiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: stable@vger.kernel.org # 4.19
Link: http://lkml.kernel.org/r/100ea2ec-ed14-b56d-d810-e0a6d2f4b069@intel.comSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
上级 f3de8640
......@@ -763,7 +763,8 @@ static struct intel_pt_queue *intel_pt_alloc_queue(struct intel_pt *pt,
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 intel_pt *pt,
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;
}
......
......@@ -285,20 +285,46 @@ void thread_stack__free(struct thread *thread)
}
}
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 (!thread || !thread->ts)
chain->nr = 1;
else
chain->nr = min(sz, thread->ts->cnt + 1);
if (sz < 2) {
chain->nr = 0;
return;
}
chain->ips[0] = ip;
chain->ips[0] = context;
chain->ips[1] = 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 *
......
......@@ -84,7 +84,7 @@ int thread_stack__event(struct thread *thread, u32 flags, u64 from_ip,
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);
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册