Linux Kernel Clock _ ldd3 Clock _ Time Clock

Time Allocation
1) The time period has elapsed.
Generally, Zookeeper "jiffies" uses zookeeper when creating zookeeper.
①. "Jiffies" has already been used to make
Currently, Zookeeper has been added to the jiffies environment,
Int time_after (unsigned long a, unsigned long B );
Int time_before (unsigned long a, unsigned long B );
Int time_after_eq (unsigned long a, unsigned long B );
Int time_before_eq (unsigned long a, unsigned long B );
Jiffies returns struct timeval/struct timespec contains invalid values,
Unsigned long timespec_to_jiffies (struct timespec * value );
Void jiffies_to_timespec (unsigned long jiffies, struct timespec * value );
Unsigned long timeval_to_jiffies (struct timeval * value );
Void jiffies_to_timeval (unsigned long jiffies, struct timeval * value );
64. When zookeeper has jiffies installed successfully,
U64 get_jiffies_64 (void );
2) unknown method at present
Method 1: "jiffies" has already been used. Currently, our table has already been used successfully.
Usually, when there is a temporary amount of time later, there will be a temporary amount of time later, and there will be a temporary amount of time later.
Method 2: Run "struct timespec current_kernel_time (void)" to disable,
At present, when (the jiffy granularity, namely, the granularity of kernel, kernel, and kernel) is too large, the xtime ratio is too large.

During the specified period, "jiffies" has been used for temporary changes,
Unsigned long mktime (unsigned int year,
Unsigned int Mon,
Unsigned int day,
Unsigned int hour,
Unsigned int min,
Unsigned int Sec );
3). The rows are too large.
When performing the examination, you must renew the examination. please refer to the following link for more information.
When 1 second, there were too many large numbers of small numbers of bytes. when too many threads are used to make too many threads.
When very short, there will be a long delay, and generally there will be too many such problems.
(1) prolonged delay (1) Delayed delayed)
Too many pending
Accuracy and accuracy of dynamic route for analyticdb are optimized, while dynamic route for analyticdb is optimized when the dynamic route for analyticdb is used,
The most widely used zookeeper is installed with the jiffy certificate.
Example:
While (time_before (jiffies, J1 )){
Cpu_relax ();
}
When installing a category-specific volume, it is possible that the volume is too large.
Zookeeper, Zookeeper, and zookeeper
It is necessary to activate or release the dynamic route explicitly.
Example:
While (time_before (jiffies, J1 )){
Schedule ();
}
"Schedule" has been released because there are too many zookeeper attempts to free up zookeeper and zookeeper. zookeeper insurance is provided.
We recommend that you solve the problem in the future.
When there are too many other users
Please refer to the following link for more information: the rows are too many,
Long wait_event_timeout (wait_queue_head_t Q, condition, long timeout );
Long wait_event_interruptible_timeout (wait_queue_head_t Q,
Condition,
Long timeout); // "/proc/jitqueue 」
The specified region has been delayed,
Signed long schedule_timeout (signed long timeout );
② Short term Delay
Dozens of rows in seconds.
Void msleep (unsigned int millisecs );
Unsigned long msleep_interruptible (unsigned int millisecs );
Void ssleep (unsigned int seconds)
4). Too many bytes have been transferred.
Later, I started to launch some temporary errors. when there are too many threads, too many threads, and so on.
(Too many threads are being used to adjust the number of threads, and the number of concurrent threads is being processed)
Zookeeper and zookeeper are used to specify peak hours and peak hours. zookeeper and zookeeper are used to specify peak hours. when the number of bytes is too large, there are too many numbers of Characters in the structure.
Please refer to the following link for more information: "Please refer to the following link for more information:" Please refer to the following link for more information.
Please refer to 1. Please wait a few minutes before you begin ).
Please refer to the following link for more information.
When there is no time between these two statements, there may be too many statements.
When there are too many attempts when there are too many attempts, the current number of attempts when there are too many means that when there are too many attempts, the number of attempts when there are too many attempts.
Zookeeper has been released, Zookeeper has been released, and zookeeper has been released. (For example, if kmalloc has already been used, it is possible that the system has already been used, so that the system has already been used)
SMP has been running too many images, and has been running too many images, and has been running too many auto snapshots. It must be the same as when the CPU is running too many images.
1. zookeeper APIs
Struct timer_list
{
/*...*/
Unsigned long expires;
Void (* function) (unsigned long );
Unsigned long data;
};
Void init_timer (struct timer_list * timer );
Struct timer_list timer_initializer (_ function, _ expires, _ data );

Void add_timer (struct timer_list * timer );
Int del_timer (struct timer_list * timer );

// Please wait until the time expires.
Int mod_timer (struct timer_list * timer, unsigned long expires );
// For SMP version, please note that "del_timer" and "zookeeper" should be used to keep your website updated.
Int del_timer_sync (struct timer_list * timer );
// When there is a fair amount of legal disclaimer, there is a fair amount of legal disclaimer.
Int timer_pending (const struct timer_list * timer );
(2) zookeeper Installation
.
5). Please wait until then
When there are too many threads, there are too many threads to cut them, and then manage them.
When there are too many concurrent users, there are too many concurrent users, and the number of concurrent users in a specific period of time is too large. when there are too many threads, there are too many threads,
Later, the primary and secondary nodes will be selected when the primary and secondary nodes will be added during peak hours.
Please refer to the following example for more information: when there are too many threads) the rows are too large.
There are two possible causes for this problem.
Struct tasklet_struct {
/*...*/

Void (* func) (unsigned long );
Unsigned long data;
};

void tasklet_init (struct tasklet_struct * t, void (* func) (unsigned long), unsigned long data);
declare_tasklet (name, func, data );
declare_tasklet_disabled (name, func, data);

Please refer to the following link for more information:
Please wait until there are too many attempts to handle these issues, and then there will be too many attempts to handle these issues.
There are two major problems in the same region.
The highest priority is higher than the highest priority. The highest priority is higher than the highest priority.
There are two very large numbers of small numbers of numbers, large numbers of small numbers of numbers.
Same as zookeeper, Zookeeper, and zookeeper.

Worker count:
Void tasklet_disable (struct tasklet_struct * t );
Void tasklet_disable_nosync (struct tasklet_struct * t );
Void tasklet_enable (struct tasklet_struct * t );
Void tasklet_schedule (struct tasklet_struct * t );
// The master node is too large to be used first.
Void tasklet_hi_schedule (struct tasklet_struct * t );
Void tasklet_kill (struct tasklet_struct * t );
6) job waiting Column
In this case, the number of large numbers of users is almost the same as that of large numbers of users.
For example, when the number of Primary keys is large, the number of rows in the primary keys is small, and the number of rows in the primary keys is small. when necessary, please wait until necessary before you begin again.
The number of rows in the reserved columns is limited, and the specified time period is delayed.
For example, if the job is to be completed in the lower-right column, the upper-right corner is displayed.
During the short term, there will be a number of concurrent users in the early stage, and there will be a number of concurrent users in the early stage,
In the job to be written, the number of bytes in the column is waiting for a while, and the number of bytes in the column is too large.

Worker count:
Struct workqueue_struct * create_workqueue (const char * Name );
Struct workqueue_struct * create_singlethread_workqueue (const char * Name );

Declare_work (name, void (* function) (void *), void * data );
Int queue_work (struct workqueue_struct * queue, struct work_struct * work );
Int queue_delayed_work (struct workqueue_struct * queue, struct work_struct * Work, unsigned long delay );

Init_work (struct work_struct * Work,
Void (* function) (void *),
Void * data); // construct the work_struct structure when the row is completed.
Prepare_work (struct work_struct * Work,
Void (* function) (void *),
Void * data );

Int cancel_delayed_work (struct work_struct * work );
Void flush_workqueue (struct workqueue_struct * Queue); // adjust worker
Void destroy_workqueue (struct workqueue_struct * Queue );

A total of pending columns are available, and the number of pending jobs is provided. A total of pending jobs are available. too many requests.
Which of the following statements is missing?
Wait until the primary column expires for a long period of time until the primary column expires.
When there are too many requests, there are still too many attempts to adjust the bandwidth during peak hours.

int schedule_work (struct work_struct * work);
int schedule_delayed_work (struct work_struct * Work, unsigned long delay);
void flush_scheduled_work (void );
int cancel_delayed_work (struct work_struct * work);