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Message-Id: <20230801090124.8050-3-zegao@tencent.com>
Date: Tue, 1 Aug 2023 17:01:20 +0800
From: Ze Gao <zegao2021@...il.com>
To: Adrian Hunter <adrian.hunter@...el.com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Ingo Molnar <mingo@...hat.com>, Jiri Olsa <jolsa@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Masami Hiramatsu <mhiramat@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
linux-trace-kernel@...r.kernel.org,
linux-trace-devel@...r.kernel.org, Ze Gao <zegao@...cent.com>
Subject: [RFC PATCH v3 2/6] perf sched: reorganize sched-out task state report code
this patch mainly does housekeeping work and not
introduce any functional change.
Signed-off-by: Ze Gao <zegao@...cent.com>
---
tools/perf/builtin-sched.c | 57 ++++++++++++++++----------------------
1 file changed, 24 insertions(+), 33 deletions(-)
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index c0d0ad18fc76..275da655b67a 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -94,11 +94,6 @@ struct sched_atom {
#define TASK_STATE_TO_CHAR_STR "RSDTtXZPI"
-/* task state bitmask, copied from include/linux/sched.h */
-#define TASK_RUNNING 0
-#define TASK_INTERRUPTIBLE 1
-#define TASK_UNINTERRUPTIBLE 2
-
enum thread_state {
THREAD_SLEEPING = 0,
THREAD_WAIT_CPU,
@@ -255,7 +250,7 @@ struct thread_runtime {
u64 total_preempt_time;
u64 total_delay_time;
- int last_state;
+ char last_state;
char shortname[3];
bool comm_changed;
@@ -425,7 +420,7 @@ static void add_sched_event_wakeup(struct perf_sched *sched, struct task_desc *t
}
static void add_sched_event_sleep(struct perf_sched *sched, struct task_desc *task,
- u64 timestamp, u64 task_state __maybe_unused)
+ u64 timestamp, char task_state __maybe_unused)
{
struct sched_atom *event = get_new_event(task, timestamp);
@@ -840,6 +835,20 @@ replay_wakeup_event(struct perf_sched *sched,
return 0;
}
+static inline char task_state_char(int state)
+{
+ static const char state_to_char[] = "RSDTtXZPI";
+ unsigned bit = state ? ffs(state) : 0;
+ return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
+}
+
+static inline char get_task_prev_state(struct evsel *evsel,
+ struct perf_sample *sample)
+{
+ const int prev_state = evsel__intval(evsel, sample, "prev_state");
+ return task_state_char(prev_state);
+}
+
static int replay_switch_event(struct perf_sched *sched,
struct evsel *evsel,
struct perf_sample *sample,
@@ -849,7 +858,7 @@ static int replay_switch_event(struct perf_sched *sched,
*next_comm = evsel__strval(evsel, sample, "next_comm");
const u32 prev_pid = evsel__intval(evsel, sample, "prev_pid"),
next_pid = evsel__intval(evsel, sample, "next_pid");
- const u64 prev_state = evsel__intval(evsel, sample, "prev_state");
+ const char prev_state = get_task_prev_state(evsel, sample);
struct task_desc *prev, __maybe_unused *next;
u64 timestamp0, timestamp = sample->time;
int cpu = sample->cpu;
@@ -1039,12 +1048,6 @@ static int thread_atoms_insert(struct perf_sched *sched, struct thread *thread)
return 0;
}
-static char sched_out_state(u64 prev_state)
-{
- const char *str = TASK_STATE_TO_CHAR_STR;
-
- return str[prev_state];
-}
static int
add_sched_out_event(struct work_atoms *atoms,
@@ -1121,7 +1124,7 @@ static int latency_switch_event(struct perf_sched *sched,
{
const u32 prev_pid = evsel__intval(evsel, sample, "prev_pid"),
next_pid = evsel__intval(evsel, sample, "next_pid");
- const u64 prev_state = evsel__intval(evsel, sample, "prev_state");
+ const char prev_state = get_task_prev_state(evsel, sample);
struct work_atoms *out_events, *in_events;
struct thread *sched_out, *sched_in;
u64 timestamp0, timestamp = sample->time;
@@ -1157,7 +1160,7 @@ static int latency_switch_event(struct perf_sched *sched,
goto out_put;
}
}
- if (add_sched_out_event(out_events, sched_out_state(prev_state), timestamp))
+ if (add_sched_out_event(out_events, prev_state, timestamp))
return -1;
in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
@@ -2015,24 +2018,12 @@ static void timehist_header(struct perf_sched *sched)
printf("\n");
}
-static char task_state_char(struct thread *thread, int state)
-{
- static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
- unsigned bit = state ? ffs(state) : 0;
-
- /* 'I' for idle */
- if (thread->tid == 0)
- return 'I';
-
- return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
-}
-
static void timehist_print_sample(struct perf_sched *sched,
struct evsel *evsel,
struct perf_sample *sample,
struct addr_location *al,
struct thread *thread,
- u64 t, int state)
+ u64 t, char state)
{
struct thread_runtime *tr = thread__priv(thread);
const char *next_comm = evsel__strval(evsel, sample, "next_comm");
@@ -2073,7 +2064,7 @@ static void timehist_print_sample(struct perf_sched *sched,
print_sched_time(tr->dt_run, 6);
if (sched->show_state)
- printf(" %5c ", task_state_char(thread, state));
+ printf(" %5c ", thread->tid == 0 ? 'I' : state);
if (sched->show_next) {
snprintf(nstr, sizeof(nstr), "next: %s[%d]", next_comm, next_pid);
@@ -2145,9 +2136,9 @@ static void timehist_update_runtime_stats(struct thread_runtime *r,
else if (r->last_time) {
u64 dt_wait = tprev - r->last_time;
- if (r->last_state == TASK_RUNNING)
+ if (r->last_state == 'R' || r->last_state == 'p')
r->dt_preempt = dt_wait;
- else if (r->last_state == TASK_UNINTERRUPTIBLE)
+ else if (r->last_state == 'D')
r->dt_iowait = dt_wait;
else
r->dt_sleep = dt_wait;
@@ -2564,7 +2555,7 @@ static int timehist_sched_change_event(struct perf_tool *tool,
struct thread_runtime *tr = NULL;
u64 tprev, t = sample->time;
int rc = 0;
- int state = evsel__intval(evsel, sample, "prev_state");
+ char state = get_task_prev_state(evsel, sample);
if (machine__resolve(machine, &al, sample) < 0) {
pr_err("problem processing %d event. skipping it\n",
--
2.40.1
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