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Date: Fri, 22 May 2015 18:23:19 -0400
From: Tejun Heo <tj@...nel.org>
To: axboe@...nel.dk
Cc: linux-kernel@...r.kernel.org, jack@...e.cz, hch@...radead.org,
hannes@...xchg.org, linux-fsdevel@...r.kernel.org,
vgoyal@...hat.com, lizefan@...wei.com, cgroups@...r.kernel.org,
linux-mm@...ck.org, mhocko@...e.cz, clm@...com,
fengguang.wu@...el.com, david@...morbit.com, gthelen@...gle.com,
khlebnikov@...dex-team.ru, Tejun Heo <tj@...nel.org>
Subject: [PATCH 02/19] writeback: clean up wb_dirty_limit()
The function name wb_dirty_limit(), its argument @dirty and the local
variable @wb_dirty are mortally confusing given that the function
calculates per-wb threshold value not dirty pages, especially given
that @dirty and @wb_dirty are used elsewhere for dirty pages.
Let's rename the function to wb_calc_thresh() and wb_dirty to
wb_thresh.
Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Jens Axboe <axboe@...nel.dk>
Cc: Jan Kara <jack@...e.cz>
Cc: Wu Fengguang <fengguang.wu@...el.com>
Cc: Greg Thelen <gthelen@...gle.com>
---
fs/fs-writeback.c | 2 +-
include/linux/writeback.h | 2 +-
mm/backing-dev.c | 6 +++---
mm/page-writeback.c | 30 +++++++++++++++---------------
4 files changed, 20 insertions(+), 20 deletions(-)
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 881ea5d..b1b3b81 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -1081,7 +1081,7 @@ static bool over_bground_thresh(struct bdi_writeback *wb)
global_page_state(NR_UNSTABLE_NFS) > background_thresh)
return true;
- if (wb_stat(wb, WB_RECLAIMABLE) > wb_dirty_limit(wb, background_thresh))
+ if (wb_stat(wb, WB_RECLAIMABLE) > wb_calc_thresh(wb, background_thresh))
return true;
return false;
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 23af355..0435c85 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -155,7 +155,7 @@ int dirty_writeback_centisecs_handler(struct ctl_table *, int,
void __user *, size_t *, loff_t *);
void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty);
-unsigned long wb_dirty_limit(struct bdi_writeback *wb, unsigned long dirty);
+unsigned long wb_calc_thresh(struct bdi_writeback *wb, unsigned long thresh);
void __wb_update_bandwidth(struct bdi_writeback *wb,
unsigned long thresh,
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index ad5608d..9c8b7b5 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -49,7 +49,7 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v)
struct bdi_writeback *wb = &bdi->wb;
unsigned long background_thresh;
unsigned long dirty_thresh;
- unsigned long bdi_thresh;
+ unsigned long wb_thresh;
unsigned long nr_dirty, nr_io, nr_more_io, nr_dirty_time;
struct inode *inode;
@@ -67,7 +67,7 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v)
spin_unlock(&wb->list_lock);
global_dirty_limits(&background_thresh, &dirty_thresh);
- bdi_thresh = wb_dirty_limit(wb, dirty_thresh);
+ wb_thresh = wb_calc_thresh(wb, dirty_thresh);
#define K(x) ((x) << (PAGE_SHIFT - 10))
seq_printf(m,
@@ -87,7 +87,7 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v)
"state: %10lx\n",
(unsigned long) K(wb_stat(wb, WB_WRITEBACK)),
(unsigned long) K(wb_stat(wb, WB_RECLAIMABLE)),
- K(bdi_thresh),
+ K(wb_thresh),
K(dirty_thresh),
K(background_thresh),
(unsigned long) K(wb_stat(wb, WB_DIRTIED)),
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 70cf98d..c7745a7 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -556,7 +556,7 @@ static unsigned long hard_dirty_limit(unsigned long thresh)
}
/**
- * wb_dirty_limit - @wb's share of dirty throttling threshold
+ * wb_calc_thresh - @wb's share of dirty throttling threshold
* @wb: bdi_writeback to query
* @dirty: global dirty limit in pages
*
@@ -577,28 +577,28 @@ static unsigned long hard_dirty_limit(unsigned long thresh)
* The wb's share of dirty limit will be adapting to its throughput and
* bounded by the bdi->min_ratio and/or bdi->max_ratio parameters, if set.
*/
-unsigned long wb_dirty_limit(struct bdi_writeback *wb, unsigned long dirty)
+unsigned long wb_calc_thresh(struct bdi_writeback *wb, unsigned long thresh)
{
- u64 wb_dirty;
+ u64 wb_thresh;
long numerator, denominator;
unsigned long wb_min_ratio, wb_max_ratio;
/*
- * Calculate this BDI's share of the dirty ratio.
+ * Calculate this BDI's share of the thresh ratio.
*/
wb_writeout_fraction(wb, &numerator, &denominator);
- wb_dirty = (dirty * (100 - bdi_min_ratio)) / 100;
- wb_dirty *= numerator;
- do_div(wb_dirty, denominator);
+ wb_thresh = (thresh * (100 - bdi_min_ratio)) / 100;
+ wb_thresh *= numerator;
+ do_div(wb_thresh, denominator);
wb_min_max_ratio(wb, &wb_min_ratio, &wb_max_ratio);
- wb_dirty += (dirty * wb_min_ratio) / 100;
- if (wb_dirty > (dirty * wb_max_ratio) / 100)
- wb_dirty = dirty * wb_max_ratio / 100;
+ wb_thresh += (thresh * wb_min_ratio) / 100;
+ if (wb_thresh > (thresh * wb_max_ratio) / 100)
+ wb_thresh = thresh * wb_max_ratio / 100;
- return wb_dirty;
+ return wb_thresh;
}
/*
@@ -750,7 +750,7 @@ static unsigned long wb_position_ratio(struct bdi_writeback *wb,
* total amount of RAM is 16GB, bdi->max_ratio is equal to 1%, global
* limits are set by default to 10% and 20% (background and throttle).
* Then wb_thresh is 1% of 20% of 16GB. This amounts to ~8K pages.
- * wb_dirty_limit(wb, bg_thresh) is about ~4K pages. wb_setpoint is
+ * wb_calc_thresh(wb, bg_thresh) is about ~4K pages. wb_setpoint is
* about ~6K pages (as the average of background and throttle wb
* limits). The 3rd order polynomial will provide positive feedback if
* wb_dirty is under wb_setpoint and vice versa.
@@ -1115,7 +1115,7 @@ static void wb_update_dirty_ratelimit(struct bdi_writeback *wb,
*
* We rampup dirty_ratelimit forcibly if wb_dirty is low because
* it's possible that wb_thresh is close to zero due to inactivity
- * of backing device (see the implementation of wb_dirty_limit()).
+ * of backing device (see the implementation of wb_calc_thresh()).
*/
if (unlikely(wb->bdi->capabilities & BDI_CAP_STRICTLIMIT)) {
dirty = wb_dirty;
@@ -1123,7 +1123,7 @@ static void wb_update_dirty_ratelimit(struct bdi_writeback *wb,
setpoint = wb_dirty + 1;
else
setpoint = (wb_thresh +
- wb_dirty_limit(wb, bg_thresh)) / 2;
+ wb_calc_thresh(wb, bg_thresh)) / 2;
}
if (dirty < setpoint) {
@@ -1352,7 +1352,7 @@ static inline void wb_dirty_limits(struct bdi_writeback *wb,
* wb_position_ratio() will let the dirtier task progress
* at some rate <= (write_bw / 2) for bringing down wb_dirty.
*/
- *wb_thresh = wb_dirty_limit(wb, dirty_thresh);
+ *wb_thresh = wb_calc_thresh(wb, dirty_thresh);
if (wb_bg_thresh)
*wb_bg_thresh = dirty_thresh ? div_u64((u64)*wb_thresh *
--
2.4.0
--
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