On Mon, Mar 23, 2015 at 12:54:11AM -0400, Tejun Heo wrote:
>
>
> How to test
> -----------
>
> * Boot with kernel option "cgroup__DEVEL__legacy_files_on_dfl".
>
> * umount /sys/fs/cgroup/memory
> umount /sys/fs/cgroup/blkio
> mkdir /sys/fs/cgroup/unified
> mount -t cgroup -o __DEVEL__sane_behavior cgroup /sys/fs/cgroup/unified
> echo +blkio > /sys/fs/cgroup/unified/cgroup.subtree_control
>
> * Build the cgroup hierarchy (don't forget to enable blkio using
> subtree_control) and put processes in cgroups and run tests on ext2
> filesystems and blkio.throttle.* knobs.
>
[..]
> This patchset is on top of
>
> block/for-4.1/core bfd343aa1718 ("blk-mq: don't wait in blk_mq_queue_enter() if __GFP_WAIT isn't set")
> + [1] [PATCH] writeback: fix possible underflow in write bandwidth calculation
>
> and available in the following git branch.
>
> git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-cgroup-writeback-20150322
>
Hi Tejun,
Great Work. I tried to do some basic testing and it seems to work.
I used "review-cgroup-writeback-switch-20150322" branch for my testing.
I have 32G of RAM on my system and I setup a write bandwidth of 1MB/s
on the disk and allowed a dd to run. That dd quickly consumed 5G of
page cache before it reached to a steady state. Sounds like too much
of cache consumption which will be drained at a speed of 1MB/s. Not
sure if this is expected or bdi back-pressure is not being applied soon
enough.
Thanks
Vivek
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>