On 2016-03-04 12:39, Christoph Hellwig wrote:
On Sat, Mar 05, 2016 at 12:29:39AM +0700, Linus Walleij wrote:
Hi Tejun,
I'm doing a summary of this discussion as a part of presenting
Linaro's involvement in Paolo's work. So I try to understand things.
Btw, can someone explain why you guys waste so much time hacking and
arguing about a legacy codebase (old request code and I/O schedulers)
that everyone would really like to see disappear. Why don't you
spend your time on blk-mq where you have an entirely clean slate
for scheduling?
1. This all started long before blk-mq hit mainline.
2. There's still a decent amount of block drivers that don't support
blk-mq. Last time I looked (around the time 4.4 came out), I saw the
following that either obviously don't support it, or are ambiguous as to
whether they support it or not. Here's a list of just the ones I know
are being used on existing systems running relatively recent kernel
versions, not including any of the MTD stuff:
* fd
* MD
* bcache
* mmcblk
* nbd
* dasd
* drbd
* rbd
* aoe
* xvd (I know there were patches for this floating around, but I
never saw if they got merged or not)
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