Hello, This patchset contains only the btrfs part of the following patchset.
[1] [PATCHSET v2 btrfs/for-next] blkcg, btrfs: fix cgroup writeback support The block part has already been applied to https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/ for-linus with some naming changes. This patchset has been updated accordingly. When writeback is executed asynchronously (e.g. for compression), bios are bounced to and issued by worker pool shared by all cgroups. This leads to significant priority inversions when cgroup IO control is in use - IOs for a low priority cgroup can tie down the workers forcing higher priority IOs to wait behind them. This patchset updates btrfs to issue async IOs through the new bio punt mechanism. A bio tagged with REQ_CGROUP_PUNT flag is bounced to the asynchronous issue context of the associated blkcg on bio_submit(). As the bios are issued from per-blkcg work items, there's no concern for priority inversions and it doesn't require invasive changes to the filesystems. This patchset contains the following 5 patches. 0001-Btrfs-stop-using-btrfs_schedule_bio.patch 0002-Btrfs-delete-the-entire-async-bio-submission-framewo.patch 0003-Btrfs-only-associate-the-locked-page-with-one-async_.patch 0004-Btrfs-use-REQ_CGROUP_PUNT-for-worker-thread-submitte.patch 0005-Btrfs-extent_write_locked_range-should-attach-inode-.patch The patches are also available in the following branch. git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-btrfs-cgroup-updates-v3 Thanks, diffstat follows. fs/btrfs/compression.c | 16 ++ fs/btrfs/compression.h | 3 fs/btrfs/ctree.h | 1 fs/btrfs/disk-io.c | 25 +--- fs/btrfs/extent_io.c | 15 +- fs/btrfs/inode.c | 62 +++++++++-- fs/btrfs/super.c | 1 fs/btrfs/volumes.c | 264 ------------------------------------------------- fs/btrfs/volumes.h | 10 - 9 files changed, 90 insertions(+), 307 deletions(-) -- tejun [1] http://lkml.kernel.org/r/20190615182453.843275-1...@kernel.org
