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authorTejun Heo <tj@kernel.org>2015-05-22 17:13:46 -0400
committerJens Axboe <axboe@fb.com>2015-06-02 08:33:35 -0600
commit766a9d6e60578f1ef6de71f89f022084f8bffc82 (patch)
treec14261a70cdc790ffca5e82fa006fa8adf663319 /include/linux/backing-dev-defs.h
parentd6c10f1fc8626dc55946f4768ae322b4c57b07dd (diff)
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writeback: implement backing_dev_info->tot_write_bandwidth
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: Tejun Heo <tj@kernel.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: Jan Kara <jack@suse.cz> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux/backing-dev-defs.h')
-rw-r--r--include/linux/backing-dev-defs.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h
index 7a94b7850b7c..d631a61f4023 100644
--- a/include/linux/backing-dev-defs.h
+++ b/include/linux/backing-dev-defs.h
@@ -142,6 +142,8 @@ struct backing_dev_info {
unsigned int min_ratio;
unsigned int max_ratio, max_prop_frac;
+ atomic_long_t tot_write_bandwidth; /* sum of active avg_write_bw */
+
struct bdi_writeback wb; /* the root writeback info for this bdi */
struct bdi_writeback_congested wb_congested; /* its congested state */
#ifdef CONFIG_CGROUP_WRITEBACK
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