From 03b32cb2810814756095dbd91fce0c77617d096b Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@intel.com>
Date: Fri, 21 Dec 2018 14:06:13 +0200
Subject: perf thread-stack: Simplify some code in thread_stack__process()
In preparation for fixing thread stack processing for the idle task,
simplify some code in thread_stack__process().
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20181221120620.9659-2-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/thread-stack.c | 18 +++++++-----------
1 file changed, 7 insertions(+), 11 deletions(-)
(limited to 'tools/perf/util/thread-stack.c')
diff --git a/tools/perf/util/thread-stack.c b/tools/perf/util/thread-stack.c
index 61a4286a74dc..115dc4b27a1b 100644
--- a/tools/perf/util/thread-stack.c
+++ b/tools/perf/util/thread-stack.c
@@ -593,17 +593,13 @@ int thread_stack__process(struct thread *thread, struct comm *comm,
struct thread_stack *ts = thread->ts;
int err = 0;
- if (ts) {
- if (!ts->crp) {
- /* Supersede thread_stack__event() */
- thread_stack__free(thread);
- thread->ts = thread_stack__new(thread, crp);
- if (!thread->ts)
- return -ENOMEM;
- ts = thread->ts;
- ts->comm = comm;
- }
- } else {
+ if (ts && !ts->crp) {
+ /* Supersede thread_stack__event() */
+ thread_stack__free(thread);
+ ts = NULL;
+ }
+
+ if (!ts) {
thread->ts = thread_stack__new(thread, crp);
if (!thread->ts)
return -ENOMEM;
--
cgit v1.2.3
From e0b8951190c11797971864c845e0909561525621 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@intel.com>
Date: Fri, 21 Dec 2018 14:06:14 +0200
Subject: perf thread-stack: Tidy thread_stack__bottom() usage
In preparation for fixing thread stack processing for the idle task,
tidy thread_stack__bottom() usage. Specifically, the parameter 'thread'
is not needed.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20181221120620.9659-3-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/thread-stack.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
(limited to 'tools/perf/util/thread-stack.c')
diff --git a/tools/perf/util/thread-stack.c b/tools/perf/util/thread-stack.c
index 115dc4b27a1b..068c7c8db4be 100644
--- a/tools/perf/util/thread-stack.c
+++ b/tools/perf/util/thread-stack.c
@@ -449,7 +449,7 @@ static int thread_stack__pop_cp(struct thread *thread, struct thread_stack *ts,
return 1;
}
-static int thread_stack__bottom(struct thread *thread, struct thread_stack *ts,
+static int thread_stack__bottom(struct thread_stack *ts,
struct perf_sample *sample,
struct addr_location *from_al,
struct addr_location *to_al, u64 ref)
@@ -474,7 +474,7 @@ static int thread_stack__bottom(struct thread *thread, struct thread_stack *ts,
if (!cp)
return -ENOMEM;
- return thread_stack__push_cp(thread->ts, ip, sample->time, ref, cp,
+ return thread_stack__push_cp(ts, ip, sample->time, ref, cp,
true, false);
}
@@ -617,8 +617,7 @@ int thread_stack__process(struct thread *thread, struct comm *comm,
/* If the stack is empty, put the current symbol on the stack */
if (!ts->cnt) {
- err = thread_stack__bottom(thread, ts, sample, from_al, to_al,
- ref);
+ err = thread_stack__bottom(ts, sample, from_al, to_al, ref);
if (err)
return err;
}
--
cgit v1.2.3
From bd8e68ace110941f375f5d566b0cd99fe80634b8 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@intel.com>
Date: Fri, 21 Dec 2018 14:06:15 +0200
Subject: perf thread-stack: Avoid direct reference to the thread's stack
In preparation for fixing thread stack processing for the idle task,
avoid direct reference to the thread's stack. The thread stack will
change to an array of thread stacks, at which point the meaning of the
direct reference will change.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20181221120620.9659-4-adrian.hunter@intel.com
[ Rename thread_stack__ts() to thread__stack() since this operates on a 'thread' struct ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/thread-stack.c | 81 +++++++++++++++++++++++++-----------------
1 file changed, 49 insertions(+), 32 deletions(-)
(limited to 'tools/perf/util/thread-stack.c')
diff --git a/tools/perf/util/thread-stack.c b/tools/perf/util/thread-stack.c
index 068c7c8db4be..d93cd286b048 100644
--- a/tools/perf/util/thread-stack.c
+++ b/tools/perf/util/thread-stack.c
@@ -111,9 +111,16 @@ static struct thread_stack *thread_stack__new(struct thread *thread,
ts->kernel_start = 1ULL << 63;
ts->crp = crp;
+ thread->ts = ts;
+
return ts;
}
+static inline struct thread_stack *thread__stack(struct thread *thread)
+{
+ return thread ? thread->ts : NULL;
+}
+
static int thread_stack__push(struct thread_stack *ts, u64 ret_addr,
bool trace_end)
{
@@ -226,8 +233,10 @@ static int __thread_stack__flush(struct thread *thread, struct thread_stack *ts)
int thread_stack__flush(struct thread *thread)
{
- if (thread->ts)
- return __thread_stack__flush(thread, thread->ts);
+ struct thread_stack *ts = thread->ts;
+
+ if (ts)
+ return __thread_stack__flush(thread, ts);
return 0;
}
@@ -235,16 +244,18 @@ int thread_stack__flush(struct thread *thread)
int thread_stack__event(struct thread *thread, u32 flags, u64 from_ip,
u64 to_ip, u16 insn_len, u64 trace_nr)
{
+ struct thread_stack *ts = thread__stack(thread);
+
if (!thread)
return -EINVAL;
- if (!thread->ts) {
- thread->ts = thread_stack__new(thread, NULL);
- if (!thread->ts) {
+ if (!ts) {
+ ts = thread_stack__new(thread, NULL);
+ if (!ts) {
pr_warning("Out of memory: no thread stack\n");
return -ENOMEM;
}
- thread->ts->trace_nr = trace_nr;
+ ts->trace_nr = trace_nr;
}
/*
@@ -252,14 +263,14 @@ int thread_stack__event(struct thread *thread, u32 flags, u64 from_ip,
* the stack might be completely invalid. Better to report nothing than
* to report something misleading, so flush the stack.
*/
- if (trace_nr != thread->ts->trace_nr) {
- if (thread->ts->trace_nr)
- __thread_stack__flush(thread, thread->ts);
- thread->ts->trace_nr = trace_nr;
+ if (trace_nr != ts->trace_nr) {
+ if (ts->trace_nr)
+ __thread_stack__flush(thread, ts);
+ ts->trace_nr = trace_nr;
}
/* Stop here if thread_stack__process() is in use */
- if (thread->ts->crp)
+ if (ts->crp)
return 0;
if (flags & PERF_IP_FLAG_CALL) {
@@ -270,7 +281,7 @@ int thread_stack__event(struct thread *thread, u32 flags, u64 from_ip,
ret_addr = from_ip + insn_len;
if (ret_addr == to_ip)
return 0; /* Zero-length calls are excluded */
- return thread_stack__push(thread->ts, ret_addr,
+ return thread_stack__push(ts, ret_addr,
flags & PERF_IP_FLAG_TRACE_END);
} else if (flags & PERF_IP_FLAG_TRACE_BEGIN) {
/*
@@ -280,10 +291,10 @@ int thread_stack__event(struct thread *thread, u32 flags, u64 from_ip,
* address, so try to pop that. Also, do not expect a call made
* when the trace ended, to return, so pop that.
*/
- thread_stack__pop(thread->ts, to_ip);
- thread_stack__pop_trace_end(thread->ts);
+ thread_stack__pop(ts, to_ip);
+ thread_stack__pop_trace_end(ts);
} else if ((flags & PERF_IP_FLAG_RETURN) && from_ip) {
- thread_stack__pop(thread->ts, to_ip);
+ thread_stack__pop(ts, to_ip);
}
return 0;
@@ -291,21 +302,25 @@ int thread_stack__event(struct thread *thread, u32 flags, u64 from_ip,
void thread_stack__set_trace_nr(struct thread *thread, u64 trace_nr)
{
- if (!thread || !thread->ts)
+ struct thread_stack *ts = thread__stack(thread);
+
+ if (!ts)
return;
- if (trace_nr != thread->ts->trace_nr) {
- if (thread->ts->trace_nr)
- __thread_stack__flush(thread, thread->ts);
- thread->ts->trace_nr = trace_nr;
+ if (trace_nr != ts->trace_nr) {
+ if (ts->trace_nr)
+ __thread_stack__flush(thread, ts);
+ ts->trace_nr = trace_nr;
}
}
void thread_stack__free(struct thread *thread)
{
- if (thread->ts) {
- __thread_stack__flush(thread, thread->ts);
- zfree(&thread->ts->stack);
+ struct thread_stack *ts = thread->ts;
+
+ if (ts) {
+ __thread_stack__flush(thread, ts);
+ zfree(&ts->stack);
zfree(&thread->ts);
}
}
@@ -318,6 +333,7 @@ static inline u64 callchain_context(u64 ip, u64 kernel_start)
void thread_stack__sample(struct thread *thread, struct ip_callchain *chain,
size_t sz, u64 ip, u64 kernel_start)
{
+ struct thread_stack *ts = thread__stack(thread);
u64 context = callchain_context(ip, kernel_start);
u64 last_context;
size_t i, j;
@@ -330,15 +346,15 @@ void thread_stack__sample(struct thread *thread, struct ip_callchain *chain,
chain->ips[0] = context;
chain->ips[1] = ip;
- if (!thread || !thread->ts) {
+ if (!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;
+ for (i = 2, j = 1; i < sz && j <= ts->cnt; i++, j++) {
+ ip = ts->stack[ts->cnt - j].ret_addr;
context = callchain_context(ip, kernel_start);
if (context != last_context) {
if (i >= sz - 1)
@@ -590,7 +606,7 @@ int thread_stack__process(struct thread *thread, struct comm *comm,
struct addr_location *to_al, u64 ref,
struct call_return_processor *crp)
{
- struct thread_stack *ts = thread->ts;
+ struct thread_stack *ts = thread__stack(thread);
int err = 0;
if (ts && !ts->crp) {
@@ -600,10 +616,9 @@ int thread_stack__process(struct thread *thread, struct comm *comm,
}
if (!ts) {
- thread->ts = thread_stack__new(thread, crp);
- if (!thread->ts)
+ ts = thread_stack__new(thread, crp);
+ if (!ts)
return -ENOMEM;
- ts = thread->ts;
ts->comm = comm;
}
@@ -668,7 +683,9 @@ int thread_stack__process(struct thread *thread, struct comm *comm,
size_t thread_stack__depth(struct thread *thread)
{
- if (!thread->ts)
+ struct thread_stack *ts = thread__stack(thread);
+
+ if (!ts)
return 0;
- return thread->ts->cnt;
+ return ts->cnt;
}
--
cgit v1.2.3
From f6060ac60190c625101a0b94c2d96e9ca14a7d73 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@intel.com>
Date: Fri, 21 Dec 2018 14:06:16 +0200
Subject: perf thread-stack: Allow for a thread stack array
In preparation for fixing thread stack processing for the idle task,
allow for a thread stack array.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20181221120620.9659-5-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/thread-stack.c | 40 ++++++++++++++++++++++++++++++++++------
1 file changed, 34 insertions(+), 6 deletions(-)
(limited to 'tools/perf/util/thread-stack.c')
diff --git a/tools/perf/util/thread-stack.c b/tools/perf/util/thread-stack.c
index d93cd286b048..a5f7b9d8fc23 100644
--- a/tools/perf/util/thread-stack.c
+++ b/tools/perf/util/thread-stack.c
@@ -60,6 +60,7 @@ struct thread_stack_entry {
* @last_time: last timestamp
* @crp: call/return processor
* @comm: current comm
+ * @arr_sz: size of array if this is the first element of an array
*/
struct thread_stack {
struct thread_stack_entry *stack;
@@ -71,6 +72,7 @@ struct thread_stack {
u64 last_time;
struct call_return_processor *crp;
struct comm *comm;
+ unsigned int arr_sz;
};
static int thread_stack__grow(struct thread_stack *ts)
@@ -100,6 +102,8 @@ static struct thread_stack *thread_stack__new(struct thread *thread,
if (!ts)
return NULL;
+ ts->arr_sz = 1;
+
if (thread_stack__grow(ts)) {
free(ts);
return NULL;
@@ -234,11 +238,19 @@ static int __thread_stack__flush(struct thread *thread, struct thread_stack *ts)
int thread_stack__flush(struct thread *thread)
{
struct thread_stack *ts = thread->ts;
+ unsigned int pos;
+ int err = 0;
- if (ts)
- return __thread_stack__flush(thread, ts);
+ if (ts) {
+ for (pos = 0; pos < ts->arr_sz; pos++) {
+ int ret = __thread_stack__flush(thread, ts + pos);
- return 0;
+ if (ret)
+ err = ret;
+ }
+ }
+
+ return err;
}
int thread_stack__event(struct thread *thread, u32 flags, u64 from_ip,
@@ -314,13 +326,29 @@ void thread_stack__set_trace_nr(struct thread *thread, u64 trace_nr)
}
}
+static void __thread_stack__free(struct thread *thread, struct thread_stack *ts)
+{
+ __thread_stack__flush(thread, ts);
+ zfree(&ts->stack);
+}
+
+static void thread_stack__reset(struct thread *thread, struct thread_stack *ts)
+{
+ unsigned int arr_sz = ts->arr_sz;
+
+ __thread_stack__free(thread, ts);
+ memset(ts, 0, sizeof(*ts));
+ ts->arr_sz = arr_sz;
+}
+
void thread_stack__free(struct thread *thread)
{
struct thread_stack *ts = thread->ts;
+ unsigned int pos;
if (ts) {
- __thread_stack__flush(thread, ts);
- zfree(&ts->stack);
+ for (pos = 0; pos < ts->arr_sz; pos++)
+ __thread_stack__free(thread, ts + pos);
zfree(&thread->ts);
}
}
@@ -611,7 +639,7 @@ int thread_stack__process(struct thread *thread, struct comm *comm,
if (ts && !ts->crp) {
/* Supersede thread_stack__event() */
- thread_stack__free(thread);
+ thread_stack__reset(thread, ts);
ts = NULL;
}
--
cgit v1.2.3
From 2e9e8688763ff80f032d9a78c3b4b951fb6dd7a4 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@intel.com>
Date: Fri, 21 Dec 2018 14:06:17 +0200
Subject: perf thread-stack: Factor out thread_stack__init()
In preparation for fixing thread stack processing for the idle task,
factor out thread_stack__init().
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20181221120620.9659-6-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/thread-stack.c | 26 +++++++++++++++++++-------
1 file changed, 19 insertions(+), 7 deletions(-)
(limited to 'tools/perf/util/thread-stack.c')
diff --git a/tools/perf/util/thread-stack.c b/tools/perf/util/thread-stack.c
index a5f7b9d8fc23..03770af9e5cd 100644
--- a/tools/perf/util/thread-stack.c
+++ b/tools/perf/util/thread-stack.c
@@ -93,6 +93,24 @@ static int thread_stack__grow(struct thread_stack *ts)
return 0;
}
+static int thread_stack__init(struct thread_stack *ts, struct thread *thread,
+ struct call_return_processor *crp)
+{
+ int err;
+
+ err = thread_stack__grow(ts);
+ if (err)
+ return err;
+
+ if (thread->mg && thread->mg->machine)
+ ts->kernel_start = machine__kernel_start(thread->mg->machine);
+ else
+ ts->kernel_start = 1ULL << 63;
+ ts->crp = crp;
+
+ return 0;
+}
+
static struct thread_stack *thread_stack__new(struct thread *thread,
struct call_return_processor *crp)
{
@@ -104,17 +122,11 @@ static struct thread_stack *thread_stack__new(struct thread *thread,
ts->arr_sz = 1;
- if (thread_stack__grow(ts)) {
+ if (thread_stack__init(ts, thread, crp)) {
free(ts);
return NULL;
}
- if (thread->mg && thread->mg->machine)
- ts->kernel_start = machine__kernel_start(thread->mg->machine);
- else
- ts->kernel_start = 1ULL << 63;
- ts->crp = crp;
-
thread->ts = ts;
return ts;
--
cgit v1.2.3
From 139f42f3b3b495e61bb2cfef40e1dd5e845e3052 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@intel.com>
Date: Fri, 21 Dec 2018 14:06:18 +0200
Subject: perf thread-stack: Allocate an array of thread stacks
In preparation for fixing thread stack processing for the idle task,
allocate an array of thread stacks.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20181221120620.9659-7-adrian.hunter@intel.com
[ No need to check for NULL when calling zfree(), noticed by Jiri Olsa ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/thread-stack.c | 29 +++++++++++++++++------------
1 file changed, 17 insertions(+), 12 deletions(-)
(limited to 'tools/perf/util/thread-stack.c')
diff --git a/tools/perf/util/thread-stack.c b/tools/perf/util/thread-stack.c
index 03770af9e5cd..248ed3945bec 100644
--- a/tools/perf/util/thread-stack.c
+++ b/tools/perf/util/thread-stack.c
@@ -114,20 +114,25 @@ static int thread_stack__init(struct thread_stack *ts, struct thread *thread,
static struct thread_stack *thread_stack__new(struct thread *thread,
struct call_return_processor *crp)
{
- struct thread_stack *ts;
-
- ts = zalloc(sizeof(struct thread_stack));
- if (!ts)
- return NULL;
-
- ts->arr_sz = 1;
-
- if (thread_stack__init(ts, thread, crp)) {
- free(ts);
- return NULL;
+ struct thread_stack *ts = thread->ts, *new_ts;
+ unsigned int old_sz = ts ? ts->arr_sz : 0;
+ unsigned int new_sz = 1;
+
+ if (!ts || new_sz > old_sz) {
+ new_ts = calloc(new_sz, sizeof(*ts));
+ if (!new_ts)
+ return NULL;
+ if (ts)
+ memcpy(new_ts, ts, old_sz * sizeof(*ts));
+ new_ts->arr_sz = new_sz;
+ zfree(&thread->ts);
+ thread->ts = new_ts;
+ ts = new_ts;
}
- thread->ts = ts;
+ if (!ts->stack &&
+ thread_stack__init(ts, thread, crp))
+ return NULL;
return ts;
}
--
cgit v1.2.3
From 256d92bc93fd40411a02be5cdba74a7bf91e6e09 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@intel.com>
Date: Fri, 21 Dec 2018 14:06:19 +0200
Subject: perf thread-stack: Fix thread stack processing for the idle task
perf creates a single 'struct thread' to represent the idle task. That
is because threads are identified by PID and TID, and the idle task
always has PID == TID == 0.
However, there are actually separate idle tasks for each CPU. That
creates a problem for thread stack processing which assumes that each
thread has a single stack, not one stack per CPU.
Fix that by passing through the CPU number, and in the case of the idle
"thread", pick the thread stack from an array based on the CPU number.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20181221120620.9659-8-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-script.c | 4 +--
tools/perf/util/intel-bts.c | 4 +--
tools/perf/util/intel-pt.c | 6 ++--
tools/perf/util/thread-stack.c | 72 ++++++++++++++++++++++++++++++++++--------
tools/perf/util/thread-stack.h | 8 ++---
5 files changed, 69 insertions(+), 25 deletions(-)
(limited to 'tools/perf/util/thread-stack.c')
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 88d52ed85ffc..d079f36d342d 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1182,7 +1182,7 @@ static int perf_sample__fprintf_callindent(struct perf_sample *sample,
struct addr_location *al, FILE *fp)
{
struct perf_event_attr *attr = &evsel->attr;
- size_t depth = thread_stack__depth(thread);
+ size_t depth = thread_stack__depth(thread, sample->cpu);
const char *name = NULL;
static int spacing;
int len = 0;
@@ -1716,7 +1716,7 @@ static bool show_event(struct perf_sample *sample,
struct thread *thread,
struct addr_location *al)
{
- int depth = thread_stack__depth(thread);
+ int depth = thread_stack__depth(thread, sample->cpu);
if (!symbol_conf.graph_function)
return true;
diff --git a/tools/perf/util/intel-bts.c b/tools/perf/util/intel-bts.c
index 7b27d77306c2..ee6ca65f81f4 100644
--- a/tools/perf/util/intel-bts.c
+++ b/tools/perf/util/intel-bts.c
@@ -451,7 +451,7 @@ static int intel_bts_process_buffer(struct intel_bts_queue *btsq,
continue;
intel_bts_get_branch_type(btsq, branch);
if (btsq->bts->synth_opts.thread_stack)
- thread_stack__event(thread, btsq->sample_flags,
+ thread_stack__event(thread, btsq->cpu, btsq->sample_flags,
le64_to_cpu(branch->from),
le64_to_cpu(branch->to),
btsq->intel_pt_insn.length,
@@ -523,7 +523,7 @@ static int intel_bts_process_queue(struct intel_bts_queue *btsq, u64 *timestamp)
!btsq->bts->synth_opts.thread_stack && thread &&
(!old_buffer || btsq->bts->sampling_mode ||
(btsq->bts->snapshot_mode && !buffer->consecutive)))
- thread_stack__set_trace_nr(thread, buffer->buffer_nr + 1);
+ thread_stack__set_trace_nr(thread, btsq->cpu, buffer->buffer_nr + 1);
err = intel_bts_process_buffer(btsq, buffer, thread);
diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index 149ff361ca78..2e72373ec6df 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -1174,7 +1174,7 @@ static void intel_pt_prep_sample(struct intel_pt *pt,
intel_pt_prep_b_sample(pt, ptq, event, sample);
if (pt->synth_opts.callchain) {
- thread_stack__sample(ptq->thread, ptq->chain,
+ thread_stack__sample(ptq->thread, ptq->cpu, ptq->chain,
pt->synth_opts.callchain_sz + 1,
sample->ip, pt->kernel_start);
sample->callchain = ptq->chain;
@@ -1526,11 +1526,11 @@ static int intel_pt_sample(struct intel_pt_queue *ptq)
return 0;
if (pt->synth_opts.callchain || pt->synth_opts.thread_stack)
- thread_stack__event(ptq->thread, ptq->flags, state->from_ip,
+ thread_stack__event(ptq->thread, ptq->cpu, ptq->flags, state->from_ip,
state->to_ip, ptq->insn_len,
state->trace_nr);
else
- thread_stack__set_trace_nr(ptq->thread, state->trace_nr);
+ thread_stack__set_trace_nr(ptq->thread, ptq->cpu, state->trace_nr);
if (pt->sample_branches) {
err = intel_pt_synth_branch_sample(ptq);
diff --git a/tools/perf/util/thread-stack.c b/tools/perf/util/thread-stack.c
index 248ed3945bec..d52f27f373ce 100644
--- a/tools/perf/util/thread-stack.c
+++ b/tools/perf/util/thread-stack.c
@@ -15,6 +15,7 @@
#include <linux/rbtree.h>
#include <linux/list.h>
+#include <linux/log2.h>
#include <errno.h>
#include "thread.h"
#include "event.h"
@@ -75,6 +76,16 @@ struct thread_stack {
unsigned int arr_sz;
};
+/*
+ * Assume pid == tid == 0 identifies the idle task as defined by
+ * perf_session__register_idle_thread(). The idle task is really 1 task per cpu,
+ * and therefore requires a stack for each cpu.
+ */
+static inline bool thread_stack__per_cpu(struct thread *thread)
+{
+ return !(thread->tid || thread->pid_);
+}
+
static int thread_stack__grow(struct thread_stack *ts)
{
struct thread_stack_entry *new_stack;
@@ -111,13 +122,16 @@ static int thread_stack__init(struct thread_stack *ts, struct thread *thread,
return 0;
}
-static struct thread_stack *thread_stack__new(struct thread *thread,
+static struct thread_stack *thread_stack__new(struct thread *thread, int cpu,
struct call_return_processor *crp)
{
struct thread_stack *ts = thread->ts, *new_ts;
unsigned int old_sz = ts ? ts->arr_sz : 0;
unsigned int new_sz = 1;
+ if (thread_stack__per_cpu(thread) && cpu > 0)
+ new_sz = roundup_pow_of_two(cpu + 1);
+
if (!ts || new_sz > old_sz) {
new_ts = calloc(new_sz, sizeof(*ts));
if (!new_ts)
@@ -130,6 +144,10 @@ static struct thread_stack *thread_stack__new(struct thread *thread,
ts = new_ts;
}
+ if (thread_stack__per_cpu(thread) && cpu > 0 &&
+ (unsigned int)cpu < ts->arr_sz)
+ ts += cpu;
+
if (!ts->stack &&
thread_stack__init(ts, thread, crp))
return NULL;
@@ -137,9 +155,34 @@ static struct thread_stack *thread_stack__new(struct thread *thread,
return ts;
}
-static inline struct thread_stack *thread__stack(struct thread *thread)
+static struct thread_stack *thread__cpu_stack(struct thread *thread, int cpu)
{
- return thread ? thread->ts : NULL;
+ struct thread_stack *ts = thread->ts;
+
+ if (cpu < 0)
+ cpu = 0;
+
+ if (!ts || (unsigned int)cpu >= ts->arr_sz)
+ return NULL;
+
+ ts += cpu;
+
+ if (!ts->stack)
+ return NULL;
+
+ return ts;
+}
+
+static inline struct thread_stack *thread__stack(struct thread *thread,
+ int cpu)
+{
+ if (!thread)
+ return NULL;
+
+ if (thread_stack__per_cpu(thread))
+ return thread__cpu_stack(thread, cpu);
+
+ return thread->ts;
}
static int thread_stack__push(struct thread_stack *ts, u64 ret_addr,
@@ -270,16 +313,16 @@ int thread_stack__flush(struct thread *thread)
return err;
}
-int thread_stack__event(struct thread *thread, u32 flags, u64 from_ip,
+int thread_stack__event(struct thread *thread, int cpu, u32 flags, u64 from_ip,
u64 to_ip, u16 insn_len, u64 trace_nr)
{
- struct thread_stack *ts = thread__stack(thread);
+ struct thread_stack *ts = thread__stack(thread, cpu);
if (!thread)
return -EINVAL;
if (!ts) {
- ts = thread_stack__new(thread, NULL);
+ ts = thread_stack__new(thread, cpu, NULL);
if (!ts) {
pr_warning("Out of memory: no thread stack\n");
return -ENOMEM;
@@ -329,9 +372,9 @@ int thread_stack__event(struct thread *thread, u32 flags, u64 from_ip,
return 0;
}
-void thread_stack__set_trace_nr(struct thread *thread, u64 trace_nr)
+void thread_stack__set_trace_nr(struct thread *thread, int cpu, u64 trace_nr)
{
- struct thread_stack *ts = thread__stack(thread);
+ struct thread_stack *ts = thread__stack(thread, cpu);
if (!ts)
return;
@@ -375,10 +418,11 @@ 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,
+void thread_stack__sample(struct thread *thread, int cpu,
+ struct ip_callchain *chain,
size_t sz, u64 ip, u64 kernel_start)
{
- struct thread_stack *ts = thread__stack(thread);
+ struct thread_stack *ts = thread__stack(thread, cpu);
u64 context = callchain_context(ip, kernel_start);
u64 last_context;
size_t i, j;
@@ -651,7 +695,7 @@ int thread_stack__process(struct thread *thread, struct comm *comm,
struct addr_location *to_al, u64 ref,
struct call_return_processor *crp)
{
- struct thread_stack *ts = thread__stack(thread);
+ struct thread_stack *ts = thread__stack(thread, sample->cpu);
int err = 0;
if (ts && !ts->crp) {
@@ -661,7 +705,7 @@ int thread_stack__process(struct thread *thread, struct comm *comm,
}
if (!ts) {
- ts = thread_stack__new(thread, crp);
+ ts = thread_stack__new(thread, sample->cpu, crp);
if (!ts)
return -ENOMEM;
ts->comm = comm;
@@ -726,9 +770,9 @@ int thread_stack__process(struct thread *thread, struct comm *comm,
return err;
}
-size_t thread_stack__depth(struct thread *thread)
+size_t thread_stack__depth(struct thread *thread, int cpu)
{
- struct thread_stack *ts = thread__stack(thread);
+ struct thread_stack *ts = thread__stack(thread, cpu);
if (!ts)
return 0;
diff --git a/tools/perf/util/thread-stack.h b/tools/perf/util/thread-stack.h
index f97c00a8c251..1f626f4a1c40 100644
--- a/tools/perf/util/thread-stack.h
+++ b/tools/perf/util/thread-stack.h
@@ -80,14 +80,14 @@ struct call_return_processor {
void *data;
};
-int thread_stack__event(struct thread *thread, u32 flags, u64 from_ip,
+int thread_stack__event(struct thread *thread, int cpu, 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,
+void thread_stack__set_trace_nr(struct thread *thread, int cpu, u64 trace_nr);
+void thread_stack__sample(struct thread *thread, int cpu, struct ip_callchain *chain,
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);
+size_t thread_stack__depth(struct thread *thread, int cpu);
struct call_return_processor *
call_return_processor__new(int (*process)(struct call_return *cr, void *data),
--
cgit v1.2.3