> On Tue, 20 Feb 2007 13:27:12 +0000 "J.J. Green" <[email protected]> wrote:
> Hi all
>
> I got bitten by this problem on sparc64 (a blade 1000)
>
> http://ubuntuforums.org/showthread.php?t=297474
>
> summary :
>
> modprobe bbc
>
> runs kenvctrld which uses 100% of a CPU for 5 seconds,
> then 0% for 5 seconds, then 100% .. and so on. The author
> cited above suggests removing the line
>
> remove_wait_queue(&bp->wq, &wait);
>
> in the function
>
> static int wait_for_pin(struct bbc_i2c_bus *bp, u8 *status)
>
> Is there a better way?
>
> I can test patches if that would be helpful.
>
The code around there looks relatively unbuggy to me. Removing that
remove_wait_queue() would be very bad - it would cause later stack
corruption.
msleep_interruptible() certainly shouldn't consume CPU like that. Do we
know where the CPU time is being spent? The output of:
readprofile -r
sleep 10
readprofile -n -v -m /boot/System.map | sort -n -k 3 | tail -40
would tell us.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
