[PATCH v1 1/1] binder: transaction latency tracking for user build

Frankie Chang
2020-02-05T08:25:36Z

Record start/end timestamp to binder transaction.
When transaction is completed or transaction is free,
it would be checked if transaction latency over threshold (2 sec),
if yes, printing related information for tracing.

Signed-off-by: Frankie Chang <Frankie.Chang@mediatek.com>
---
drivers/android/Kconfig | 8 +++
drivers/android/binder.c | 107 +++++++++++++++++++++++++++++++++++++
drivers/android/binder_internal.h | 4 ++
3 files changed, 119 insertions(+)

diff --git a/drivers/android/Kconfig b/drivers/android/Kconfig
index 6fdf2ab..7ba80eb 100644
--- a/drivers/android/Kconfig
+++ b/drivers/android/Kconfig
@@ -54,6 +54,14 @@ config ANDROID_BINDER_IPC_SELFTEST
exhaustively with combinations of various buffer sizes and
alignments.

+config BINDER_USER_TRACKING
+ bool "Android Binder transaction tracking"
+ help
+ Used for track abnormal binder transaction which is over 2 seconds,
+ when the transaction is done or be free, this transaction would be
+ checked whether it executed overtime.
+ If yes, printing out the detail info about it.
+
endif # if ANDROID

endmenu
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index e9bc9fc..5a352ee 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -76,6 +76,11 @@
#include "binder_internal.h"
#include "binder_trace.h"

+#ifdef CONFIG_BINDER_USER_TRACKING
+#include <linux/rtc.h>
+#include <linux/time.h>
+#endif
+
static HLIST_HEAD(binder_deferred_list);
static DEFINE_MUTEX(binder_deferred_lock);

@@ -591,8 +596,104 @@ struct binder_transaction {
* during thread teardown
*/
spinlock_t lock;
+#ifdef CONFIG_BINDER_USER_TRACKING
+ struct timespec timestamp;
+ struct timeval tv;
+#endif
};

+#ifdef CONFIG_BINDER_USER_TRACKING
+
+/*
+ * binder_print_delay - Output info of a delay transaction
+ * @t: pointer to the over-time transaction
+ */
+static void binder_print_delay(struct binder_transaction *t)
+{
+ struct rtc_time tm;
+ struct timespec *startime;
+ struct timespec cur, sub_t;
+
+ ktime_get_ts(&cur);
+ startime = &t->timestamp;
+ sub_t = timespec_sub(cur, *startime);
+
+ /* if transaction time is over than 2 sec,
+ * show timeout warning log.
+ */
+ if (sub_t.tv_sec < 2)
+ return;
+
+ rtc_time_to_tm(t->tv.tv_sec, &tm);
+
+ spin_lock(&t->lock);
+ pr_info_ratelimited("%d: from %d:%d to %d:%d",
+ t->debug_id,
+ t->from ? t->from->proc->pid : 0,
+ t->from ? t->from->pid : 0,
+ t->to_proc ? t->to_proc->pid : 0,
+ t->to_thread ? t->to_thread->pid : 0);
+ spin_unlock(&t->lock);
+
+ pr_info_ratelimited(" total %u.%03ld s code %u start %lu.%03ld android %d-%02d-%02d %02d:%02d:%02d.%03lu\n",
+ (unsigned int)sub_t.tv_sec,
+ (sub_t.tv_nsec / NSEC_PER_MSEC),
+ t->code,
+ (unsigned long)startime->tv_sec,
+ (startime->tv_nsec / NSEC_PER_MSEC),
+ (tm.tm_year + 1900), (tm.tm_mon + 1), tm.tm_mday,
+ tm.tm_hour, tm.tm_min, tm.tm_sec,
+ (unsigned long)(t->tv.tv_usec / USEC_PER_MSEC));
+}
+
+static void binder_log_entry_setup(struct binder_transaction_log_entry *e)
+{
+ ktime_get_ts(&e->timestamp);
+ do_gettimeofday(&e->tv);
+ e->tv.tv_sec -= (sys_tz.tz_minuteswest * 60);
+}
+
+static void timestamp_copy(struct binder_transaction *t,
+ struct binder_transaction_log_entry *e)
+{
+ memcpy(&t->timestamp, &e->timestamp, sizeof(struct timespec));
+ memcpy(&t->tv, &e->tv, sizeof(struct timeval));
+}
+
+static void print_binder_transaction_ext(struct seq_file *m,
+ struct binder_transaction *t)
+{
+ struct rtc_time tm;
+
+ rtc_time_to_tm(t->tv.tv_sec, &tm);
+ seq_printf(m,
+ " start %lu.%06lu android %d-%02d-%02d %02d:%02d:%02d.%03lu",
+ (unsigned long)t->timestamp.tv_sec,
+ (t->timestamp.tv_nsec / NSEC_PER_USEC),
+ (tm.tm_year + 1900), (tm.tm_mon + 1), tm.tm_mday,
+ tm.tm_hour, tm.tm_min, tm.tm_sec,
+ (unsigned long)(t->tv.tv_usec / USEC_PER_MSEC));
+}
+#else
+static void binder_print_delay(struct binder_transaction *t)
+{
+}
+
+static void binder_log_entry_setup(struct binder_transaction_log_entry *e)
+{
+}
+
+static void timestamp_copy(struct binder_transaction *t,
+ struct binder_transaction_log_entry *e)
+{
+}
+
+static void print_binder_transaction_ext(struct seq_file *m,
+ struct binder_transaction *t)
+{
+}
+#endif
+
/**
* struct binder_object - union of flat binder object types
* @hdr: generic object header
@@ -1927,6 +2028,7 @@ static void binder_free_transaction(struct binder_transaction *t)
* If the transaction has no target_proc, then
* t->buffer->transaction has already been cleared.
*/
+ binder_print_delay(t);
binder_free_txn_fixups(t);
kfree(t);
binder_stats_deleted(BINDER_STAT_TRANSACTION);
@@ -2872,6 +2974,8 @@ static void binder_transaction(struct binder_proc *proc,
e->offsets_size = tr->offsets_size;
strscpy(e->context_name, proc->context->name, BINDERFS_MAX_NAME);

+ binder_log_entry_setup(e);
+
if (reply) {
binder_inner_proc_lock(proc);
in_reply_to = thread->transaction_stack;
@@ -3058,6 +3162,7 @@ static void binder_transaction(struct binder_proc *proc,
return_error_line = __LINE__;
goto err_alloc_t_failed;
}
+ timestamp_copy(t, e);
INIT_LIST_HEAD(&t->fd_fixups);
binder_stats_created(BINDER_STAT_TRANSACTION);
spin_lock_init(&t->lock);
@@ -3496,6 +3601,7 @@ static void binder_transaction(struct binder_proc *proc,
kfree(tcomplete);
binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
err_alloc_tcomplete_failed:
+ binder_print_delay(t);
kfree(t);
binder_stats_deleted(BINDER_STAT_TRANSACTION);
err_alloc_t_failed:
@@ -5544,6 +5650,7 @@ static void print_binder_transaction_ilocked(struct seq_file *m,
t->to_thread ? t->to_thread->pid : 0,
t->code, t->flags, t->priority, t->need_reply);
spin_unlock(&t->lock);
+ print_binder_transaction_ext(m, t);

if (proc != to_proc) {
/*
diff --git a/drivers/android/binder_internal.h b/drivers/android/binder_internal.h
index ae99109..ea52c5d 100644
--- a/drivers/android/binder_internal.h
+++ b/drivers/android/binder_internal.h
@@ -131,6 +131,10 @@ struct binder_transaction_log_entry {
uint32_t return_error;
uint32_t return_error_param;
char context_name[BINDERFS_MAX_NAME + 1];
+#ifdef CONFIG_BINDER_USER_TRACKING
+ struct timespec timestamp;
+ struct timeval tv;
+#endif
};

struct binder_transaction_log {
--
1.7.9.5