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-   -   udevd - producing high system load - how to track the cause? (http://www.linuxquestions.org/questions/linux-software-2/udevd-producing-high-system-load-how-to-track-the-cause-784115/)

onufry 01-22-2010 06:56 PM

udevd - producing high system load - how to track the cause?
 
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I have big problem with /sbin/udevd. For 5-10 minutes after starting X, the system load is 100% (almost everything caused by the /sbin/udevd process).

The strace output is looping around sth like this:

Code:

clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7ff7bc9d0780) = 29354
select(7, [3 4 5 6], NULL, NULL, NULL)  = ? ERESTARTNOHAND (To be restarted)
--- SIGCHLD (Child exited) @ 0 (0) ---
write(7, "\0", 1)                      = 1
rt_sigreturn(0x7)                      = -1 EINTR (Interrupted system call)
select(7, [3 4 5 6], NULL, NULL, NULL)  = 1 (in [6])
read(6, "\0", 256)                      = 1
wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], WNOHANG, NULL) = 29354
unlink("/dev/.udev/failed/\\x2fdevices\\x2fpci0000:00\\x2f0000:00:02.0\\x2fdrm\\x2fcard0") = -1 ENOENT (No such file or directory)
unlink("/dev/.udev/queue/57056")        = 0
wait4(-1, 0x7fff68f8358c, WNOHANG, NULL) = -1 ECHILD (No child processes)
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7ff7bc9d0780) = 29355

When the load goes down to normal state, the strace looks like:
Code:

select(7, [3 4 5 6], NULL, NULL, NULL
as if it hanged somewhere in the loop.

Due to my lack of knowledge I can not decode the output. I would be very grateful for any suggestions of how to trace the problem.

I'm using:
udev 135
kernel 2.6.31-gentoo-r6

I also attached my kernel config.


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