kworker 的一些information

因為 kworker/u:3 持續佔用 17% 的 cpu time。
所以要看一下。

# cat /proc/1139/stack
[c0264f54] msleep+0x24/0x30
[c04f6ac0] mmc_power_up+0x88/0xb8
[c04f848c] mmc_rescan+0x278/0x33c
[c026e7d0] process_one_work+0x2b0/0x47c
[c0270dd0] worker_thread+0x200/0x320
[c0274dc4] kthread+0x98/0xa0
[c02342a0] kernel_thread_exit+0x0/0x8
[ffffffff] 0xffffffff
# cat /proc/1139/stack
[c0270ee0] worker_thread+0x310/0x320
[c0274dc4] kthread+0x98/0xa0
[c02342a0] kernel_thread_exit+0x0/0x8
[ffffffff] 0xffffffff
# cat /proc/1139/stack
[c0270ee0] worker_thread+0x310/0x320
[c0274dc4] kthread+0x98/0xa0
[c02342a0] kernel_thread_exit+0x0/0x8
[ffffffff] 0xffffffff
# cat /proc/1139/stack
[c0270ee0] worker_thread+0x310/0x320
[c0274dc4] kthread+0x98/0xa0
[c02342a0] kernel_thread_exit+0x0/0x8
[ffffffff] 0xffffffff

所以 有一次抓到是再 mmc_rescan( )...