writeback: move global_dirty_limit into wb_domain
This patch is a part of the series to define wb_domain which
represents a domain that wb's (bdi_writeback's) belong to and are
measured against each other in. This will enable IO backpressure
propagation for cgroup writeback.
global_dirty_limit exists to regulate the global dirty threshold which
is a property of the wb_domain. This patch moves hard_dirty_limit,
dirty_lock, and update_time into wb_domain.
This is pure reorganization and doesn't introduce any behavioral
changes.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Greg Thelen <gthelen@google.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
index 9b876f6..bec6999 100644
--- a/include/trace/events/writeback.h
+++ b/include/trace/events/writeback.h
@@ -361,7 +361,7 @@
__entry->nr_written = global_page_state(NR_WRITTEN);
__entry->background_thresh = background_thresh;
__entry->dirty_thresh = dirty_thresh;
- __entry->dirty_limit = global_dirty_limit;
+ __entry->dirty_limit = global_wb_domain.dirty_limit;
),
TP_printk("dirty=%lu writeback=%lu unstable=%lu "
@@ -463,8 +463,9 @@
unsigned long freerun = (thresh + bg_thresh) / 2;
strlcpy(__entry->bdi, dev_name(bdi->dev), 32);
- __entry->limit = global_dirty_limit;
- __entry->setpoint = (global_dirty_limit + freerun) / 2;
+ __entry->limit = global_wb_domain.dirty_limit;
+ __entry->setpoint = (global_wb_domain.dirty_limit +
+ freerun) / 2;
__entry->dirty = dirty;
__entry->bdi_setpoint = __entry->setpoint *
bdi_thresh / (thresh + 1);