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authorTejun Heo <tj@kernel.org>2015-05-22 18:23:27 -0400
committerJens Axboe <axboe@fb.com>2015-06-02 08:38:13 -0600
commite9770b3487328b7e28803caf6c809292dd7adbf0 (patch)
tree6214a88ef38a3f661cc731abaf9c112cf0b6e7a6
parentdaddfa3cb30ebfe322d50af146d830fd435ddb1f (diff)
downloadop-kernel-dev-e9770b3487328b7e28803caf6c809292dd7adbf0.zip
op-kernel-dev-e9770b3487328b7e28803caf6c809292dd7adbf0.tar.gz
writeback: add dirty_throttle_control->wb_completions
wb->completions measures the wb's proportional write bandwidth in global_wb_domain and thus naturally tied to the wb_domain. This patch adds dirty_throttle_control->wb_completions which is initialized to wb->completions by GDTC_INIT() and updates __wb_dirty_limits() to use it instead of dereferencing wb->completions directly. This will allow dirty_throttle_control to represent different wb_domains and the matching wb completions. This patch 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>
-rw-r--r--mm/page-writeback.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index fcebae7..5b439fc 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -127,6 +127,7 @@ struct wb_domain global_wb_domain;
/* consolidated parameters for balance_dirty_pages() and its subroutines */
struct dirty_throttle_control {
struct bdi_writeback *wb;
+ struct fprop_local_percpu *wb_completions;
unsigned long dirty; /* file_dirty + write + nfs */
unsigned long thresh; /* dirty threshold */
@@ -139,7 +140,8 @@ struct dirty_throttle_control {
unsigned long pos_ratio;
};
-#define GDTC_INIT(__wb) .wb = (__wb)
+#define GDTC_INIT(__wb) .wb = (__wb), \
+ .wb_completions = &(__wb)->completions
/*
* Length of period for aging writeout fractions of bdis. This is an
@@ -590,7 +592,7 @@ static unsigned long __wb_calc_thresh(struct dirty_throttle_control *dtc)
/*
* Calculate this BDI's share of the thresh ratio.
*/
- fprop_fraction_percpu(&dom->completions, &dtc->wb->completions,
+ fprop_fraction_percpu(&dom->completions, dtc->wb_completions,
&numerator, &denominator);
wb_thresh = (thresh * (100 - bdi_min_ratio)) / 100;
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