• Tejun Heo's avatar
    writeback: implement backing_dev_info->tot_write_bandwidth · 766a9d6e
    Tejun Heo authored
    cgroup writeback support needs to keep track of the sum of
    avg_write_bandwidth of all wb's (bdi_writeback's) with dirty inodes to
    distribute write workload.  This patch adds bdi->tot_write_bandwidth
    and updates inode_wb_list_move_locked(), inode_wb_list_del_locked()
    and wb_update_write_bandwidth() to adjust it as wb's gain and lose
    dirty inodes and its avg_write_bandwidth gets updated.
    
    As the update events are not synchronized with each other,
    bdi->tot_write_bandwidth is an atomic_long_t.
    Signed-off-by: default avatarTejun Heo <tj@kernel.org>
    Cc: Jens Axboe <axboe@kernel.dk>
    Cc: Jan Kara <jack@suse.cz>
    Signed-off-by: default avatarJens Axboe <axboe@fb.com>
    766a9d6e
fs-writeback.c 46.3 KB