Messages in this thread | | | From | Tejun Heo <> | Subject | [PATCHSET] cgroup, writeback, btrfs: make sure btrfs issues metadata IOs from the root cgroup | Date | Mon, 9 Oct 2017 14:29:08 -0700 |
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Hello,
btrfs has different ways to issue metadata IOs and may end up issuing metadata or otherwise shared IOs from a non-root cgroup, which can lead to priority inversion and ineffective IO isolation.
This patchset makes sure that btrfs issues all metadata and shared IOs from the root cgroup by exempting btree_inodes from cgroup writeback and explicitly associating shared IOs with the root cgroup.
This patchset containst he following three patches
[PATCH 1/3] cgroup, writeback: replace SB_I_CGROUPWB with per-inode [PATCH 2/3] cgroup, writeback: implement submit_bh_blkcg_css() [PATCH 3/3] btrfs: ensure that metadata and flush are issued from the
and is also available in the following git branch
git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-cgroup-btrfs-metadata
diffstat follows. Thanks.
fs/block_dev.c | 3 +-- fs/btrfs/check-integrity.c | 2 +- fs/btrfs/disk-io.c | 4 ++++ fs/btrfs/ioctl.c | 6 +++++- fs/btrfs/super.c | 1 - fs/buffer.c | 12 ++++++++++++ fs/ext2/inode.c | 3 ++- fs/ext2/super.c | 1 - fs/ext4/inode.c | 5 ++++- fs/ext4/super.c | 2 -- fs/fs-writeback.c | 1 + include/linux/backing-dev.h | 2 +- include/linux/buffer_head.h | 11 +++++++++++ include/linux/fs.h | 3 ++- include/linux/writeback.h | 6 ++++-- 15 files changed, 48 insertions(+), 14 deletions(-)
-- tejun
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