From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Clark Williams <williams@redhat.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Adrian Hunter <adrian.hunter@intel.com>,
Andi Kleen <ak@linux.intel.com>, Jiri Olsa <jolsa@redhat.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: [PATCH 24/27] perf tools: Improve thread_stack__process() for trace begin / end
Date: Mon, 24 Sep 2018 12:02:39 -0300 [thread overview]
Message-ID: <20180924150242.14235-25-acme@kernel.org> (raw)
In-Reply-To: <20180924150242.14235-1-acme@kernel.org>
From: Adrian Hunter <adrian.hunter@intel.com>
thread_stack__process() is used to create call paths for database
export. Improve the handling of trace begin / end to allow for a trace
that ends in a call.
Previously, the Intel PT decoder would indicate begin / end by a branch
from / to zero. That hides useful information, in particular when a
trace ends with a call. Before remedying that, enhance the thread stack
so that it identifies the trace end by the flag instead of by ip == 0.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/20180920130048.31432-5-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/thread-stack.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/tools/perf/util/thread-stack.c b/tools/perf/util/thread-stack.c
index e3f7dfecafa9..c091635bf7dc 100644
--- a/tools/perf/util/thread-stack.c
+++ b/tools/perf/util/thread-stack.c
@@ -357,7 +357,7 @@ void call_return_processor__free(struct call_return_processor *crp)
static int thread_stack__push_cp(struct thread_stack *ts, u64 ret_addr,
u64 timestamp, u64 ref, struct call_path *cp,
- bool no_call)
+ bool no_call, bool trace_end)
{
struct thread_stack_entry *tse;
int err;
@@ -375,6 +375,7 @@ static int thread_stack__push_cp(struct thread_stack *ts, u64 ret_addr,
tse->branch_count = ts->branch_count;
tse->cp = cp;
tse->no_call = no_call;
+ tse->trace_end = trace_end;
return 0;
}
@@ -448,7 +449,7 @@ static int thread_stack__bottom(struct thread *thread, struct thread_stack *ts,
return -ENOMEM;
return thread_stack__push_cp(thread->ts, ip, sample->time, ref, cp,
- true);
+ true, false);
}
static int thread_stack__no_call_return(struct thread *thread,
@@ -480,7 +481,7 @@ static int thread_stack__no_call_return(struct thread *thread,
if (!cp)
return -ENOMEM;
return thread_stack__push_cp(ts, 0, sample->time, ref,
- cp, true);
+ cp, true, false);
}
} else if (thread_stack__in_kernel(ts) && sample->ip < ks) {
/* Return to userspace, so pop all kernel addresses */
@@ -505,7 +506,7 @@ static int thread_stack__no_call_return(struct thread *thread,
return -ENOMEM;
err = thread_stack__push_cp(ts, sample->addr, sample->time, ref, cp,
- true);
+ true, false);
if (err)
return err;
@@ -525,7 +526,7 @@ static int thread_stack__trace_begin(struct thread *thread,
/* Pop trace end */
tse = &ts->stack[ts->cnt - 1];
- if (tse->cp->sym == NULL && tse->cp->ip == 0) {
+ if (tse->trace_end) {
err = thread_stack__call_return(thread, ts, --ts->cnt,
timestamp, ref, false);
if (err)
@@ -554,7 +555,7 @@ static int thread_stack__trace_end(struct thread_stack *ts,
ret_addr = sample->ip + sample->insn_len;
return thread_stack__push_cp(ts, ret_addr, sample->time, ref, cp,
- false);
+ false, true);
}
int thread_stack__process(struct thread *thread, struct comm *comm,
@@ -604,6 +605,7 @@ int thread_stack__process(struct thread *thread, struct comm *comm,
ts->last_time = sample->time;
if (sample->flags & PERF_IP_FLAG_CALL) {
+ bool trace_end = sample->flags & PERF_IP_FLAG_TRACE_END;
struct call_path_root *cpr = ts->crp->cpr;
struct call_path *cp;
u64 ret_addr;
@@ -621,7 +623,7 @@ int thread_stack__process(struct thread *thread, struct comm *comm,
if (!cp)
return -ENOMEM;
err = thread_stack__push_cp(ts, ret_addr, sample->time, ref,
- cp, false);
+ cp, false, trace_end);
} else if (sample->flags & PERF_IP_FLAG_RETURN) {
if (!sample->ip || !sample->addr)
return 0;
--
2.14.4
next prev parent reply other threads:[~2018-09-24 15:05 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-24 15:02 [GIT PULL 00/27] perf/core improvements and fixes Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 01/27] perf help: Add missing subcommand `version` Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 02/27] perf tools: Report itrace options in help Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 03/27] tools lib subcmd: Support overwriting the pager Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 04/27] perf script: Allow sym and dso without ip, addr Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 05/27] perf script: Print DSO for callindent Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 06/27] tools lib traceevent, perf tools: Rename struct event_format to struct tep_event_format Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 07/27] tools lib traceevent, perf tools: Rename struct format{_field} to struct tep_format{_field} Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 08/27] tools lib traceevent, perf tools: Rename enum format_flags to enum tep_format_flags Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 09/27] tools lib traceevent: Rename enum event_{sort_}type to enum tep_event_{sort_}type Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 10/27] tools lib traceevent: Add prefix TEP_ to all EVENT_FL_* flags Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 11/27] tools lib traceevent, perf tools: Add prefix tep_ to all print_* structures Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 12/27] tools lib traceevent, perf tools: Rename enum print_arg_type to enum tep_print_arg_type Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 13/27] tools lib traceevent: Add prefix tep_ to enums filter_{boolean,op,cmp}_type Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 14/27] tools lib traceevent: Add prefix tep_ to enums filter_{exp,arg}_type Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 15/27] tools lib traceevent: Add prefix tep_ to struct filter_{arg,value_type} Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 16/27] tools lib traceevent: Add prefix tep_ to various structs filter_arg_* Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 17/27] tools lib traceevent: Add prefix tep_ to structs filter_type and event_filter Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 18/27] tools lib traceevent: Rename struct plugin_list to struct tep_plugin_list Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 19/27] tools lib traceevent: Rename data2host*() APIs Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 20/27] tools lib traceevent: Add prefix tep_ to enum filter_trivial_type Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 21/27] perf script: Enhance sample flags for trace begin / end Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 22/27] perf db-export: Add trace begin / end branch type variants Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 23/27] perf tools: Improve thread_stack__event() for trace begin / end Arnaldo Carvalho de Melo
2018-09-24 15:02 ` Arnaldo Carvalho de Melo [this message]
2018-09-24 15:02 ` [PATCH 25/27] perf intel-pt: Add decoder flags " Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 26/27] perf intel-pt: Implement " Arnaldo Carvalho de Melo
2018-09-24 15:02 ` [PATCH 27/27] perf vendor events arm64: Revise core JSON events for eMAG Arnaldo Carvalho de Melo
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