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Date: Tue, 6 Jan 2015 16:25:46 -0500
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,
Tejun Heo <tj@...nel.org>
Subject: [PATCH 09/45] writeback: make congestion functions per bdi_writeback
Currently, all congestion functions take bdi (backing_dev_info) and
always operate on the root wb (bdi->wb) and the congestion state from
the block layer is propagated only for the root blkcg. This patch
introduces {set|clear}_wb_congested() and wb_congested() which take
@wb and operate on it. The bdi counteparts are now wrappers invoking
the wb based functions on @bdi->wb.
While converting clear_bdi_congested() to clear_wb_congested(), the
local variable declaration order between @wqh and @bit is swapped for
cosmetic reason.
This patch just adds the new wb based functions. The following
patches will apply them.
Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Jens Axboe <axboe@...nel.dk>
Cc: Jan Kara <jack@...e.cz>
---
include/linux/backing-dev-defs.h | 14 +++++++++++--
include/linux/backing-dev.h | 43 +++++++++++++++++++++++-----------------
mm/backing-dev.c | 22 ++++++++++----------
3 files changed, 48 insertions(+), 31 deletions(-)
diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h
index 511066f..54a3a9c 100644
--- a/include/linux/backing-dev-defs.h
+++ b/include/linux/backing-dev-defs.h
@@ -122,7 +122,17 @@ enum {
BLK_RW_SYNC = 1,
};
-void clear_bdi_congested(struct backing_dev_info *bdi, int sync);
-void set_bdi_congested(struct backing_dev_info *bdi, int sync);
+void clear_wb_congested(struct bdi_writeback *wb, int sync);
+void set_wb_congested(struct bdi_writeback *wb, int sync);
+
+static inline void clear_bdi_congested(struct backing_dev_info *bdi, int sync)
+{
+ clear_wb_congested(&bdi->wb, sync);
+}
+
+static inline void set_bdi_congested(struct backing_dev_info *bdi, int sync)
+{
+ set_wb_congested(&bdi->wb, sync);
+}
#endif /* __LINUX_BACKING_DEV_DEFS_H */
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 3722796..be66668 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -182,27 +182,13 @@ extern struct backing_dev_info noop_backing_dev_info;
int writeback_in_progress(struct backing_dev_info *bdi);
-static inline int bdi_congested(struct backing_dev_info *bdi, int bdi_bits)
+static inline int wb_congested(struct bdi_writeback *wb, int bdi_bits)
{
+ struct backing_dev_info *bdi = wb->bdi;
+
if (bdi->congested_fn)
return bdi->congested_fn(bdi->congested_data, bdi_bits);
- return (bdi->wb.state & bdi_bits);
-}
-
-static inline int bdi_read_congested(struct backing_dev_info *bdi)
-{
- return bdi_congested(bdi, 1 << WB_sync_congested);
-}
-
-static inline int bdi_write_congested(struct backing_dev_info *bdi)
-{
- return bdi_congested(bdi, 1 << WB_async_congested);
-}
-
-static inline int bdi_rw_congested(struct backing_dev_info *bdi)
-{
- return bdi_congested(bdi, (1 << WB_sync_congested) |
- (1 << WB_async_congested));
+ return wb->state & bdi_bits;
}
long congestion_wait(int sync, long timeout);
@@ -422,4 +408,25 @@ static inline struct bdi_writeback *page_cgwb_wb(struct page *page)
#endif /* CONFIG_CGROUP_WRITEBACK */
+static inline int bdi_congested(struct backing_dev_info *bdi, int bdi_bits)
+{
+ return wb_congested(&bdi->wb, bdi_bits);
+}
+
+static inline int bdi_read_congested(struct backing_dev_info *bdi)
+{
+ return bdi_congested(bdi, 1 << WB_sync_congested);
+}
+
+static inline int bdi_write_congested(struct backing_dev_info *bdi)
+{
+ return bdi_congested(bdi, 1 << WB_async_congested);
+}
+
+static inline int bdi_rw_congested(struct backing_dev_info *bdi)
+{
+ return bdi_congested(bdi, (1 << WB_sync_congested) |
+ (1 << WB_async_congested));
+}
+
#endif /* _LINUX_BACKING_DEV_H */
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index c6dda82..2851278 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -767,31 +767,31 @@ static wait_queue_head_t congestion_wqh[2] = {
__WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[0]),
__WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[1])
};
-static atomic_t nr_bdi_congested[2];
+static atomic_t nr_wb_congested[2];
-void clear_bdi_congested(struct backing_dev_info *bdi, int sync)
+void clear_wb_congested(struct bdi_writeback *wb, int sync)
{
- enum wb_state bit;
wait_queue_head_t *wqh = &congestion_wqh[sync];
+ enum wb_state bit;
bit = sync ? WB_sync_congested : WB_async_congested;
- if (test_and_clear_bit(bit, &bdi->wb.state))
- atomic_dec(&nr_bdi_congested[sync]);
+ if (test_and_clear_bit(bit, &wb->state))
+ atomic_dec(&nr_wb_congested[sync]);
smp_mb__after_atomic();
if (waitqueue_active(wqh))
wake_up(wqh);
}
-EXPORT_SYMBOL(clear_bdi_congested);
+EXPORT_SYMBOL(clear_wb_congested);
-void set_bdi_congested(struct backing_dev_info *bdi, int sync)
+void set_wb_congested(struct bdi_writeback *wb, int sync)
{
enum wb_state bit;
bit = sync ? WB_sync_congested : WB_async_congested;
- if (!test_and_set_bit(bit, &bdi->wb.state))
- atomic_inc(&nr_bdi_congested[sync]);
+ if (!test_and_set_bit(bit, &wb->state))
+ atomic_inc(&nr_wb_congested[sync]);
}
-EXPORT_SYMBOL(set_bdi_congested);
+EXPORT_SYMBOL(set_wb_congested);
/**
* congestion_wait - wait for a backing_dev to become uncongested
@@ -850,7 +850,7 @@ long wait_iff_congested(struct zone *zone, int sync, long timeout)
* encountered in the current zone, yield if necessary instead
* of sleeping on the congestion queue
*/
- if (atomic_read(&nr_bdi_congested[sync]) == 0 ||
+ if (atomic_read(&nr_wb_congested[sync]) == 0 ||
!test_bit(ZONE_CONGESTED, &zone->flags)) {
cond_resched();
--
2.1.0
--
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