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sync SYSCALL_DEFINE0(sync)free_more_memorydo_try_to_free_pages=>void wakeup_flusher_threads(long nr_pages){	bdi_writeback_all(NULL, nr_pages);	=>void bdi_writeback_all(struct super_block *sb, long nr_pages)	{		list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) {			bdi_alloc_queue_work(bdi, &args);			=>void bdi_alloc_queue_work(struct backing_dev_info *bdi, struct wb_writeback_args *args)			{				bdi_queue_work(bdi, work);				=>void bdi_queue_work(struct backing_dev_info *bdi, struct bdi_work *work)				{					list_add_tail_rcu(&work->list, &bdi->work_list);					if (unlikely(list_empty_careful(&bdi->wb_list)))						wake_up_process(default_backing_dev_info.wb.task);					else {						struct bdi_writeback *wb = &bdi->wb;						if (wb->task)							wake_up_process(wb->task);					}				}			}		}	}}

唤醒线程

int bdi_forker_task(void *ptr){	for (;;) {		if (wb_has_dirty_io(me) || !list_empty(&me->bdi->work_list))			wb_do_writeback(me, 0);					wb->task = kthread_run(bdi_start_fn, wb, "flush-%s", dev_name(bdi->dev));	}}

Linux 3.2中回写机制的变革

https://blog.51cto.com/alanwu/1109952

writeback机制源码分析

https://blog.51cto.com/alanwu/1110046

linux pagecache bdi writeback 机制

https://blog.csdn.net/qqqqqq999999/article/details/77481899

mmap原理及流程(kernel 4.1版本)        博客不错

https://blog.csdn.net/omnispace/article/details/77600704

普通文件的readpage方法（do_mpage_readpage）

https://blog.csdn.net/weixin_36145588/article/details/74990382

do_mpage_readpage函数详细分析

http://blog.chinaunix.net/uid-28236237-id-4028521.html

linux2.6.37内核接两个硬盘导致读写效率变低的问题

https://blog.csdn.net/ctthuangcheng/article/details/42204425

Cgroup-memory子系统分析(1)

https://blog.csdn.net/tanzhe2017/article/details/81001507