Re: [PATCH v2 1/1] binder: transaction latency tracking for user build

Todd Kjos
2020-04-15T22:25:45Z

On Tue, Apr 14, 2020 at 10:38 PM Frankie Chang
<Frankie.Chang@mediatek.com> wrote:
>
> Record start/end timestamp to binder transaction.

s/timestamp to/timestamps for/

> When transaction is completed or transaction is free,
> it would be checked if transaction latency over threshold (2 sec),

Is the 2 sec configurable? Why was 2 sec chosen?

> if yes, printing related information for tracing.
>
> /* Implement details */
> - Add tracepoint/trace at free transaction.
> Since the original trace_binder_transaction_reveived cannot

s/reveived/received/

> precisely present the real finished time of transaction, adding a
> trace_binder_free_transaction at the point of free transaction
> may be more close to it.

Can we just add that trace instead?

>
> - Add latency tracer module to monitor slow transaction.
> The trace_binder_free_transaction would not be enabled
> by default. Monitoring which transaction is too slow to
> cause some of exceptions is important. So we hook the
> tracepoint to call the monitor function.
>
> - Move some struct from core file to header file.
> Need some struct defined in core file in latency trace module
> In addition, moving structs to header file makes module more
> extendable.
>
> Signed-off-by: Frankie Chang <Frankie.Chang@mediatek.com>
> ---
> drivers/android/Kconfig | 8 ++
> drivers/android/Makefile | 1 +
> drivers/android/binder.c | 237 ++++---------------------------
> drivers/android/binder_internal.h | 227 +++++++++++++++++++++++++++++
> drivers/android/binder_latency_tracer.c | 100 +++++++++++++
> drivers/android/binder_trace.h | 36 +++++
> 6 files changed, 400 insertions(+), 209 deletions(-)
> create mode 100644 drivers/android/binder_latency_tracer.c
>
> 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/Makefile b/drivers/android/Makefile
> index c9d3d0c9..552e8ac 100644
> --- a/drivers/android/Makefile
> +++ b/drivers/android/Makefile
> @@ -4,3 +4,4 @@ ccflags-y += -I$(src) # needed for trace events
> obj-$(CONFIG_ANDROID_BINDERFS) += binderfs.o
> obj-$(CONFIG_ANDROID_BINDER_IPC) += binder.o binder_alloc.o
> obj-$(CONFIG_ANDROID_BINDER_IPC_SELFTEST) += binder_alloc_selftest.o
> +obj-$(CONFIG_BINDER_USER_TRACKING) += binder_latency_tracer.o
> diff --git a/drivers/android/binder.c b/drivers/android/binder.c
> index a6b2082..380a68b 100644
> --- a/drivers/android/binder.c
> +++ b/drivers/android/binder.c
> @@ -160,24 +160,6 @@ static int binder_set_stop_on_user_error(const char *val,
> #define to_binder_fd_array_object(hdr) \
> container_of(hdr, struct binder_fd_array_object, hdr)
>
> -enum binder_stat_types {
> - BINDER_STAT_PROC,
> - BINDER_STAT_THREAD,
> - BINDER_STAT_NODE,
> - BINDER_STAT_REF,
> - BINDER_STAT_DEATH,
> - BINDER_STAT_TRANSACTION,
> - BINDER_STAT_TRANSACTION_COMPLETE,
> - BINDER_STAT_COUNT
> -};
> -
> -struct binder_stats {
> - atomic_t br[_IOC_NR(BR_FAILED_REPLY) + 1];
> - atomic_t bc[_IOC_NR(BC_REPLY_SG) + 1];
> - atomic_t obj_created[BINDER_STAT_COUNT];
> - atomic_t obj_deleted[BINDER_STAT_COUNT];
> -};
> -
> static struct binder_stats binder_stats;
>
> static inline void binder_stats_deleted(enum binder_stat_types type)
> @@ -214,32 +196,6 @@ static struct binder_transaction_log_entry *binder_transaction_log_add(
> }
>
> /**
> - * struct binder_work - work enqueued on a worklist
> - * @entry: node enqueued on list
> - * @type: type of work to be performed
> - *
> - * There are separate work lists for proc, thread, and node (async).
> - */
> -struct binder_work {
> - struct list_head entry;
> -
> - enum {
> - BINDER_WORK_TRANSACTION = 1,
> - BINDER_WORK_TRANSACTION_COMPLETE,
> - BINDER_WORK_RETURN_ERROR,
> - BINDER_WORK_NODE,
> - BINDER_WORK_DEAD_BINDER,
> - BINDER_WORK_DEAD_BINDER_AND_CLEAR,
> - BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
> - } type;
> -};
> -
> -struct binder_error {
> - struct binder_work work;
> - uint32_t cmd;
> -};
> -
> -/**
> * struct binder_node - binder node bookkeeping
> * @debug_id: unique ID for debugging
> * (invariant after initialized)

Please, if we must have a binder_internal.h for the key data
structures, then move them all.
The use of structs by transaction latency stuff shouldn't be the
rationale for what moves and
what stays. binder_proc, binder_node, binder_thread etc should be defined
in the same file.

> @@ -402,89 +358,6 @@ enum binder_deferred_state {
> BINDER_DEFERRED_RELEASE = 0x02,
> };
>
> -/**
> - * struct binder_proc - binder process bookkeeping
> - * @proc_node: element for binder_procs list
> - * @threads: rbtree of binder_threads in this proc
> - * (protected by @inner_lock)
> - * @nodes: rbtree of binder nodes associated with
> - * this proc ordered by node->ptr
> - * (protected by @inner_lock)
> - * @refs_by_desc: rbtree of refs ordered by ref->desc
> - * (protected by @outer_lock)
> - * @refs_by_node: rbtree of refs ordered by ref->node
> - * (protected by @outer_lock)
> - * @waiting_threads: threads currently waiting for proc work
> - * (protected by @inner_lock)
> - * @pid PID of group_leader of process
> - * (invariant after initialized)
> - * @tsk task_struct for group_leader of process
> - * (invariant after initialized)
> - * @deferred_work_node: element for binder_deferred_list
> - * (protected by binder_deferred_lock)
> - * @deferred_work: bitmap of deferred work to perform
> - * (protected by binder_deferred_lock)
> - * @is_dead: process is dead and awaiting free
> - * when outstanding transactions are cleaned up
> - * (protected by @inner_lock)
> - * @todo: list of work for this process
> - * (protected by @inner_lock)
> - * @stats: per-process binder statistics
> - * (atomics, no lock needed)
> - * @delivered_death: list of delivered death notification
> - * (protected by @inner_lock)
> - * @max_threads: cap on number of binder threads
> - * (protected by @inner_lock)
> - * @requested_threads: number of binder threads requested but not
> - * yet started. In current implementation, can
> - * only be 0 or 1.
> - * (protected by @inner_lock)
> - * @requested_threads_started: number binder threads started
> - * (protected by @inner_lock)
> - * @tmp_ref: temporary reference to indicate proc is in use
> - * (protected by @inner_lock)
> - * @default_priority: default scheduler priority
> - * (invariant after initialized)
> - * @debugfs_entry: debugfs node
> - * @alloc: binder allocator bookkeeping
> - * @context: binder_context for this proc
> - * (invariant after initialized)
> - * @inner_lock: can nest under outer_lock and/or node lock
> - * @outer_lock: no nesting under innor or node lock
> - * Lock order: 1) outer, 2) node, 3) inner
> - * @binderfs_entry: process-specific binderfs log file
> - *
> - * Bookkeeping structure for binder processes
> - */
> -struct binder_proc {
> - struct hlist_node proc_node;
> - struct rb_root threads;
> - struct rb_root nodes;
> - struct rb_root refs_by_desc;
> - struct rb_root refs_by_node;
> - struct list_head waiting_threads;
> - int pid;
> - struct task_struct *tsk;
> - struct hlist_node deferred_work_node;
> - int deferred_work;
> - bool is_dead;
> -
> - struct list_head todo;
> - struct binder_stats stats;
> - struct list_head delivered_death;
> - int max_threads;
> - int requested_threads;
> - int requested_threads_started;
> - int tmp_ref;
> - long default_priority;
> - struct dentry *debugfs_entry;
> - struct binder_alloc alloc;
> - struct binder_context *context;
> - spinlock_t inner_lock;
> - spinlock_t outer_lock;
> - struct dentry *binderfs_entry;
> -};
> -
> enum {
> BINDER_LOOPER_STATE_REGISTERED = 0x01,
> BINDER_LOOPER_STATE_ENTERED = 0x02,
> @@ -495,60 +368,6 @@ enum {
> };
>
> /**
> - * struct binder_thread - binder thread bookkeeping
> - * @proc: binder process for this thread
> - * (invariant after initialization)
> - * @rb_node: element for proc->threads rbtree
> - * (protected by @proc->inner_lock)
> - * @waiting_thread_node: element for @proc->waiting_threads list
> - * (protected by @proc->inner_lock)
> - * @pid: PID for this thread
> - * (invariant after initialization)
> - * @looper: bitmap of looping state
> - * (only accessed by this thread)
> - * @looper_needs_return: looping thread needs to exit driver
> - * (no lock needed)
> - * @transaction_stack: stack of in-progress transactions for this thread
> - * (protected by @proc->inner_lock)
> - * @todo: list of work to do for this thread
> - * (protected by @proc->inner_lock)
> - * @process_todo: whether work in @todo should be processed
> - * (protected by @proc->inner_lock)
> - * @return_error: transaction errors reported by this thread
> - * (only accessed by this thread)
> - * @reply_error: transaction errors reported by target thread
> - * (protected by @proc->inner_lock)
> - * @wait: wait queue for thread work
> - * @stats: per-thread statistics
> - * (atomics, no lock needed)
> - * @tmp_ref: temporary reference to indicate thread is in use
> - * (atomic since @proc->inner_lock cannot
> - * always be acquired)
> - * @is_dead: thread is dead and awaiting free
> - * when outstanding transactions are cleaned up
> - * (protected by @proc->inner_lock)
> - *
> - * Bookkeeping structure for binder threads.
> - */
> -struct binder_thread {
> - struct binder_proc *proc;
> - struct rb_node rb_node;
> - struct list_head waiting_thread_node;
> - int pid;
> - int looper; /* only modified by this thread */
> - bool looper_need_return; /* can be written by other thread */
> - struct binder_transaction *transaction_stack;
> - struct list_head todo;
> - bool process_todo;
> - struct binder_error return_error;
> - struct binder_error reply_error;
> - wait_queue_head_t wait;
> - struct binder_stats stats;
> - atomic_t tmp_ref;
> - bool is_dead;
> -};
> -
> -/**
> * struct binder_txn_fd_fixup - transaction fd fixup list element
> * @fixup_entry: list entry
> * @file: struct file to be associated with new fd
> @@ -565,34 +384,6 @@ struct binder_txn_fd_fixup {
> size_t offset;
> };
>
>

extra empty line?

> -struct binder_transaction {
> - int debug_id;
> - struct binder_work work;
> - struct binder_thread *from;
> - struct binder_transaction *from_parent;
> - struct binder_proc *to_proc;
> - struct binder_thread *to_thread;
> - struct binder_transaction *to_parent;
> - unsigned need_reply:1;
> - /* unsigned is_dead:1; */ /* not used at the moment */
> -
> - struct binder_buffer *buffer;
> - unsigned int code;
> - unsigned int flags;
> - long priority;
> - long saved_priority;
> - kuid_t sender_euid;
> - struct list_head fd_fixups;
> - binder_uintptr_t security_ctx;
> - /**
> - * @lock: protects @from, @to_proc, and @to_thread
> - *
> - * @from, @to_proc, and @to_thread can be set to NULL
> - * during thread teardown
> - */
> - spinlock_t lock;
> -};
> -
> /**
> * struct binder_object - union of flat binder object types
> * @hdr: generic object header
> @@ -613,6 +404,26 @@ struct binder_object {
> };
> };
>
> +static void (*__binder_update_info_cb)(struct binder_transaction *t,
> + struct binder_transaction_log_entry *e);
> +
> +void set_binder_update_info_cb(void (*fn)(struct binder_transaction *t,
> + struct binder_transaction_log_entry *e))
> +{
> + __binder_update_info_cb = fn;
> +}
> +EXPORT_SYMBOL_GPL(set_binder_update_info_cb);
> +
> +static void (*__print_transaction_ext_cb)(struct seq_file *m,
> + struct binder_transaction *t);
> +
> +void set_print_transaction_ext_cb(void (*fn)(struct seq_file *m,
> + struct binder_transaction *t))
> +{
> + __print_transaction_ext_cb = fn;
> +}
> +EXPORT_SYMBOL_GPL(set_print_transaction_ext_cb);

Why can't we use tracepoints (not trace events) for this instead of
custom registration functions? You can attach to the tracepoint with
register_trace_* lets a module register to be called to handle the
tracepoint as Joel pointed out.

> +
> /**
> * binder_proc_lock() - Acquire outer lock for given binder_proc
> * @proc: struct binder_proc to acquire
> @@ -1927,6 +1738,7 @@ static void binder_free_transaction(struct binder_transaction *t)
> * If the transaction has no target_proc, then
> * t->buffer->transaction has already been cleared.
> */
> + trace_binder_free_transaction(t);
> binder_free_txn_fixups(t);
> kfree(t);
> binder_stats_deleted(BINDER_STAT_TRANSACTION);
> @@ -2874,6 +2686,7 @@ static void binder_transaction(struct binder_proc *proc,
> e->offsets_size = tr->offsets_size;
> strscpy(e->context_name, proc->context->name, BINDERFS_MAX_NAME);
>
> +

why 2 empty lines?

> if (reply) {
> binder_inner_proc_lock(proc);
> in_reply_to = thread->transaction_stack;
> @@ -3060,6 +2873,9 @@ static void binder_transaction(struct binder_proc *proc,
> return_error_line = __LINE__;
> goto err_alloc_t_failed;
> }
> +
> + if (__binder_update_info_cb)
> + __binder_update_info_cb(t, e);

This should be a tracepoint that your module can attach to with
register_trace_binder_update_info(...)

> INIT_LIST_HEAD(&t->fd_fixups);
> binder_stats_created(BINDER_STAT_TRANSACTION);
> spin_lock_init(&t->lock);
> @@ -3498,6 +3314,7 @@ static void binder_transaction(struct binder_proc *proc,
> kfree(tcomplete);
> binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE);
> err_alloc_tcomplete_failed:
> + trace_binder_free_transaction(t);
> kfree(t);
> binder_stats_deleted(BINDER_STAT_TRANSACTION);
> err_alloc_t_failed:
> @@ -5547,6 +5364,8 @@ 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);
> + if (__print_transaction_ext_cb)
> + __print_transaction_ext_cb(m, t);

same here.

>
> if (proc != to_proc) {
> /*
> diff --git a/drivers/android/binder_internal.h b/drivers/android/binder_internal.h
> index ae99109..86b4960 100644
> --- a/drivers/android/binder_internal.h
> +++ b/drivers/android/binder_internal.h
> @@ -12,6 +12,11 @@
> #include <linux/types.h>
> #include <linux/uidgid.h>
>
> +#ifdef CONFIG_BINDER_USER_TRACKING
> +#include <linux/rtc.h>
> +#include <linux/time.h>
> +#endif
> +
> struct binder_context {
> struct binder_node *binder_context_mgr_node;
> struct mutex context_mgr_node_lock;
> @@ -131,6 +136,10 @@ 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 {
> @@ -139,6 +148,224 @@ struct binder_transaction_log {
> struct binder_transaction_log_entry entry[32];
> };
>
> +enum binder_stat_types {
> + BINDER_STAT_PROC,
> + BINDER_STAT_THREAD,
> + BINDER_STAT_NODE,
> + BINDER_STAT_REF,
> + BINDER_STAT_DEATH,
> + BINDER_STAT_TRANSACTION,
> + BINDER_STAT_TRANSACTION_COMPLETE,
> + BINDER_STAT_COUNT
> +};
> +
> +struct binder_stats {
> + atomic_t br[_IOC_NR(BR_FAILED_REPLY) + 1];
> + atomic_t bc[_IOC_NR(BC_REPLY_SG) + 1];
> + atomic_t obj_created[BINDER_STAT_COUNT];
> + atomic_t obj_deleted[BINDER_STAT_COUNT];
> +};
> +
> +/**
> + * struct binder_work - work enqueued on a worklist
> + * @entry: node enqueued on list
> + * @type: type of work to be performed
> + *
> + * There are separate work lists for proc, thread, and node (async).
> + */
> +struct binder_work {
> + struct list_head entry;
> +
> + enum {
> + BINDER_WORK_TRANSACTION = 1,
> + BINDER_WORK_TRANSACTION_COMPLETE,
> + BINDER_WORK_RETURN_ERROR,
> + BINDER_WORK_NODE,
> + BINDER_WORK_DEAD_BINDER,
> + BINDER_WORK_DEAD_BINDER_AND_CLEAR,
> + BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
> + } type;
> +};
> +
> +struct binder_error {
> + struct binder_work work;
> + uint32_t cmd;
> +};
> +
> +/**
> + * struct binder_proc - binder process bookkeeping
> + * @proc_node: element for binder_procs list
> + * @threads: rbtree of binder_threads in this proc
> + * (protected by @inner_lock)
> + * @nodes: rbtree of binder nodes associated with
> + * this proc ordered by node->ptr
> + * (protected by @inner_lock)
> + * @refs_by_desc: rbtree of refs ordered by ref->desc
> + * (protected by @outer_lock)
> + * @refs_by_node: rbtree of refs ordered by ref->node
> + * (protected by @outer_lock)
> + * @waiting_threads: threads currently waiting for proc work
> + * (protected by @inner_lock)
> + * @pid PID of group_leader of process
> + * (invariant after initialized)
> + * @tsk task_struct for group_leader of process
> + * (invariant after initialized)
> + * @deferred_work_node: element for binder_deferred_list
> + * (protected by binder_deferred_lock)
> + * @deferred_work: bitmap of deferred work to perform
> + * (protected by binder_deferred_lock)
> + * @is_dead: process is dead and awaiting free
> + * when outstanding transactions are cleaned up
> + * (protected by @inner_lock)
> + * @todo: list of work for this process
> + * (protected by @inner_lock)
> + * @stats: per-process binder statistics
> + * (atomics, no lock needed)
> + * @delivered_death: list of delivered death notification
> + * (protected by @inner_lock)
> + * @max_threads: cap on number of binder threads
> + * (protected by @inner_lock)
> + * @requested_threads: number of binder threads requested but not
> + * yet started. In current implementation, can
> + * only be 0 or 1.
> + * (protected by @inner_lock)
> + * @requested_threads_started: number binder threads started
> + * (protected by @inner_lock)
> + * @tmp_ref: temporary reference to indicate proc is in use
> + * (protected by @inner_lock)
> + * @default_priority: default scheduler priority
> + * (invariant after initialized)
> + * @debugfs_entry: debugfs node
> + * @alloc: binder allocator bookkeeping
> + * @context: binder_context for this proc
> + * (invariant after initialized)
> + * @inner_lock: can nest under outer_lock and/or node lock
> + * @outer_lock: no nesting under innor or node lock
> + * Lock order: 1) outer, 2) node, 3) inner
> + * @binderfs_entry: process-specific binderfs log file
> + *
> + * Bookkeeping structure for binder processes
> + */
> +struct binder_proc {
> + struct hlist_node proc_node;
> + struct rb_root threads;
> + struct rb_root nodes;
> + struct rb_root refs_by_desc;
> + struct rb_root refs_by_node;
> + struct list_head waiting_threads;
> + int pid;
> + struct task_struct *tsk;
> + struct hlist_node deferred_work_node;
> + int deferred_work;
> + bool is_dead;
> +
> + struct list_head todo;
> + struct binder_stats stats;
> + struct list_head delivered_death;
> + int max_threads;
> + int requested_threads;
> + int requested_threads_started;
> + int tmp_ref;
> + long default_priority;
> + struct dentry *debugfs_entry;
> + struct binder_alloc alloc;
> + struct binder_context *context;
> + spinlock_t inner_lock;
> + spinlock_t outer_lock;
> + struct dentry *binderfs_entry;
> +};
> +
> +/**
> + * struct binder_thread - binder thread bookkeeping
> + * @proc: binder process for this thread
> + * (invariant after initialization)
> + * @rb_node: element for proc->threads rbtree
> + * (protected by @proc->inner_lock)
> + * @waiting_thread_node: element for @proc->waiting_threads list
> + * (protected by @proc->inner_lock)
> + * @pid: PID for this thread
> + * (invariant after initialization)
> + * @looper: bitmap of looping state
> + * (only accessed by this thread)
> + * @looper_needs_return: looping thread needs to exit driver
> + * (no lock needed)
> + * @transaction_stack: stack of in-progress transactions for this thread
> + * (protected by @proc->inner_lock)
> + * @todo: list of work to do for this thread
> + * (protected by @proc->inner_lock)
> + * @process_todo: whether work in @todo should be processed
> + * (protected by @proc->inner_lock)
> + * @return_error: transaction errors reported by this thread
> + * (only accessed by this thread)
> + * @reply_error: transaction errors reported by target thread
> + * (protected by @proc->inner_lock)
> + * @wait: wait queue for thread work
> + * @stats: per-thread statistics
> + * (atomics, no lock needed)
> + * @tmp_ref: temporary reference to indicate thread is in use
> + * (atomic since @proc->inner_lock cannot
> + * always be acquired)
> + * @is_dead: thread is dead and awaiting free
> + * when outstanding transactions are cleaned up
> + * (protected by @proc->inner_lock)
> + *
> + * Bookkeeping structure for binder threads.
> + */
> +struct binder_thread {
> + struct binder_proc *proc;
> + struct rb_node rb_node;
> + struct list_head waiting_thread_node;
> + int pid;
> + int looper; /* only modified by this thread */
> + bool looper_need_return; /* can be written by other thread */
> + struct binder_transaction *transaction_stack;
> + struct list_head todo;
> + bool process_todo;
> + struct binder_error return_error;
> + struct binder_error reply_error;
> + wait_queue_head_t wait;
> + struct binder_stats stats;
> + atomic_t tmp_ref;
> + bool is_dead;
> +};
> +
> +struct binder_transaction {
> + int debug_id;
> + struct binder_work work;
> + struct binder_thread *from;
> + struct binder_transaction *from_parent;
> + struct binder_proc *to_proc;
> + struct binder_thread *to_thread;
> + struct binder_transaction *to_parent;
> + unsigned need_reply:1;
> + /* unsigned is_dead:1; */ /* not used at the moment */
> +
> + struct binder_buffer *buffer;
> + unsigned int code;
> + unsigned int flags;
> + long priority;
> + long saved_priority;
> + kuid_t sender_euid;
> + struct list_head fd_fixups;
> + binder_uintptr_t security_ctx;
> + /**
> + * @lock: protects @from, @to_proc, and @to_thread
> + *
> + * @from, @to_proc, and @to_thread can be set to NULL
> + * during thread teardown
> + */
> + spinlock_t lock;
> +#ifdef CONFIG_BINDER_USER_TRACKING
> + struct timespec timestamp;
> + struct timeval tv;
> +#endif
> +};
> +
> extern struct binder_transaction_log binder_transaction_log;
> extern struct binder_transaction_log binder_transaction_log_failed;
> +
> +extern void set_binder_update_info_cb(void (*fn)(struct binder_transaction *t,
> + struct binder_transaction_log_entry *e));
> +extern void set_print_transaction_ext_cb(void (*fn)(struct seq_file *m,
> + struct binder_transaction *t));
> #endif /* _LINUX_BINDER_INTERNAL_H */
> diff --git a/drivers/android/binder_latency_tracer.c b/drivers/android/binder_latency_tracer.c
> new file mode 100644
> index 0000000..c9626f5
> --- /dev/null
> +++ b/drivers/android/binder_latency_tracer.c
> @@ -0,0 +1,100 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2019 MediaTek Inc.
> + */
> +
> +#include <linux/module.h>
> +#include <uapi/linux/android/binder.h>
> +#include "binder_alloc.h"
> +#include "binder_internal.h"
> +#include "binder_trace.h"
> +
> +/*
> + * probe_binder_free_transaction - Output info of a delay transaction
> + * @t: pointer to the over-time transaction
> + */
> +void probe_binder_free_transaction(void *ignore, 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_update_info_cb(struct binder_transaction *t,
> + struct binder_transaction_log_entry *e)
> +{
> + ktime_get_ts(&e->timestamp);
> + do_gettimeofday(&e->tv);
> + e->tv.tv_sec -= (sys_tz.tz_minuteswest * 60);
> + 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));
> +
> +}
> +
> +static int __init init_binder_latency_tracer(void)
> +{
> + register_trace_binder_free_transaction(
> + probe_binder_free_transaction, NULL);
> +
> + set_binder_update_info_cb(binder_update_info_cb);
> + set_print_transaction_ext_cb(print_binder_transaction_ext);
> + return 0;
> +}
> +
> +static void exit_binder_latency_tracer(void)
> +{
> + unregister_trace_binder_free_transaction(
> + probe_binder_free_transaction, NULL);
> +}
> +
> +module_init(init_binder_latency_tracer);
> +module_exit(exit_binder_latency_tracer);
> +
> +MODULE_LICENSE("GPL v2");
> +
> diff --git a/drivers/android/binder_trace.h b/drivers/android/binder_trace.h
> index 6731c3c..c7c76c1 100644
> --- a/drivers/android/binder_trace.h
> +++ b/drivers/android/binder_trace.h
> @@ -95,6 +95,42 @@
> __entry->thread_todo)
> );
>
> +TRACE_EVENT(binder_free_transaction,
> + TP_PROTO(struct binder_transaction *t),
> + TP_ARGS(t),
> + TP_STRUCT__entry(
> + __field(int, debug_id)
> + __field(int, from_proc)
> + __field(int, from_thread)
> + __field(int, to_proc)
> + __field(int, to_thread)
> + __field(unsigned int, code)
> + __field(unsigned int, flags)
> + __field(unsigned long, start_sec)
> + __field(unsigned long, start_nsec)
> + ),
> + TP_fast_assign(
> + __entry->debug_id = t->debug_id;
> + __entry->from_proc = t->from ? t->from->proc->pid : 0;
> + __entry->from_thread = t->from ? t->from->pid : 0;
> + __entry->to_proc = t->to_proc ? t->to_proc->pid : 0;
> + __entry->to_thread = t->to_thread ? t->to_thread->pid : 0;
> + __entry->code = t->code;
> + __entry->flags = t->flags;
> +#ifdef CONFIG_BINDER_USER_TRACKING
> + __entry->start_sec = t->timestamp.tv_sec;
> + __entry->start_nsec = t->timestamp.tv_nsec / NSEC_PER_MSEC;
> +#else
> + __entry->start_sec = 0;
> + __entry->start_nsec = 0;
> +#endif
> + ),
> + TP_printk("transaction=%d from %d:%d to %d:%d flags=0x%x code=0x%x start %lu.%03ld",
> + __entry->debug_id, __entry->from_proc, __entry->from_thread,
> + __entry->to_proc, __entry->to_thread, __entry->code,
> + __entry->flags, __entry->start_sec, __entry->start_nsec)
> +);
> +
> TRACE_EVENT(binder_transaction,
> TP_PROTO(bool reply, struct binder_transaction *t,
> struct binder_node *target_node),
> --
> 1.7.9.5