函数源码

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source File:include\trace\events\writeback.h Create Date:2022-07-27 15:32:04
首页 Copyright©Brick

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#define DEFINE_WBC_EVENT(name) \
DEFINE_EVENT(wbc_class, name, \
    TP_PROTO(struct writeback_control *wbc, struct backing_dev_info *bdi), \
    TP_ARGS(wbc, bdi))
DEFINE_WBC_EVENT(wbc_writepage);
 
TRACE_EVENT(writeback_queue_io,
    TP_PROTO(struct bdi_writeback *wb,
         struct wb_writeback_work *work,
         int moved),
    TP_ARGS(wb, work, moved),
    TP_STRUCT__entry(
        __array(char,       name, 32)
        __field(unsigned long,  older)
        __field(long,       age)
        __field(int,        moved)
        __field(int,        reason)
        __field(ino_t,      cgroup_ino)
    ),
    TP_fast_assign(
        unsigned long *older_than_this = work->older_than_this;
        strscpy_pad(__entry->name, bdi_dev_name(wb->bdi), 32);
        __entry->older  = older_than_this ?  *older_than_this : 0;
        __entry->age    = older_than_this ?
                  (jiffies - *older_than_this) * 1000 / HZ : -1;
        __entry->moved  = moved;
        __entry->reason = work->reason;
        __entry->cgroup_ino = __trace_wb_assign_cgroup(wb);
    ),
    TP_printk("bdi %s: older=%lu age=%ld enqueue=%d reason=%s cgroup_ino=%lu",
        __entry->name,
        __entry->older, /* older_than_this in jiffies */
        __entry->age,   /* older_than_this in relative milliseconds */
        __entry->moved,
        __print_symbolic(__entry->reason, WB_WORK_REASON),
        (unsigned long)__entry->cgroup_ino
    )
);