On Sat, Feb 24 2007, V P wrote:
> Hi,
>
> I'm trying to modify the ordering of I/O requests in Linux kernel, and
> came across the barrier flags REQ_HARDBARRIER and REQ_SOFTBARRIER.
>
> One thing I noticed (which might be wrong) is that all the requests
> have both these flags set. What is the significance of these flags? Is
Uhm? That's definitely not true.
> it a must for a request to have this? Can I reorder two requests with
> these flags set? How is SOFTBARRIER different from HARDBARRIER?
Both imply a reordering barrier in the io scheduler, and the hard
barrier further implies a barrier at the drive/driver side. So you may
not reorder across a barrier.
--
Jens Axboe
-
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]
