On Tue, Jun 16, 2015 at 06:53:13PM -0400, Tejun Heo wrote:
> For ordered and writeback data modes, all data IOs go through
> ext4_io_submit. This patch adds cgroup writeback support by invoking
> wbc_init_bio() from io_submit_init_bio() and wbc_account_io() in
> io_submit_add_bh(). Journal data which is written by jbd2 worker is
> left alone by this patch and will always be written out from the root
> cgroup.
>
> ext4_fill_super() is updated to set MS_CGROUPWB when data mode is
> either ordered or writeback. In journaled data mode, most IOs become
> synchronous through the journal and enabling cgroup writeback support
> doesn't make much sense or difference. Journaled data mode is left
> alone.
>
> Lightly tested with sequential data write workload. Behaves as
> expected.
>
> v2: Updated for MS_CGROUPWB -> SB_I_CGROUPWB.
>
> Signed-off-by: Tejun Heo <t...@kernel.org>
> Cc: "Theodore Ts'o" <ty...@mit.edu>
> Cc: Andreas Dilger <adilger.ker...@dilger.ca>
> Cc: linux-e...@vger.kernel.org
Thanks, applied.
- Ted
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