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bcache: Track dirty data by stripe

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To make background writeback aware of raid5/6 stripes, we first need to
track the amount of dirty data within each stripe - we do this by
breaking up the existing sectors_dirty into per stripe atomic_ts

Signed-off-by: Kent Overstreet <koverstreet@google.com>
This commit is contained in:
Kent Overstreet
2013-06-05 06:21:07 -07:00
parent 444fc0b6b1
commit 279afbad4e
7 changed files with 105 additions and 26 deletions
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40
drivers/md/bcache/writeback.c
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@@ -9,6 +9,7 @@
#include "bcache.h"
#include "btree.h"
#include "debug.h"
#include "writeback.h"
#include <trace/events/bcache.h>
@@ -38,7 +39,7 @@ static void __update_writeback_rate(struct cached_dev *dc)
int change = 0;
int64_t error;
int64_t dirty = atomic_long_read(&dc->disk.sectors_dirty);
int64_t dirty = bcache_dev_sectors_dirty(&dc->disk);
int64_t derivative = dirty - dc->disk.sectors_dirty_last;
dc->disk.sectors_dirty_last = dirty;
@@ -183,10 +184,8 @@ void bch_writeback_queue(struct cached_dev *dc)
}
}
void bch_writeback_add(struct cached_dev *dc, unsigned sectors)
void bch_writeback_add(struct cached_dev *dc)
{
atomic_long_add(sectors, &dc->disk.sectors_dirty);
if (!atomic_read(&dc->has_dirty) &&
!atomic_xchg(&dc->has_dirty, 1)) {
atomic_inc(&dc->count);
@@ -205,6 +204,34 @@ void bch_writeback_add(struct cached_dev *dc, unsigned sectors)
}
}
void bcache_dev_sectors_dirty_add(struct cache_set *c, unsigned inode,
uint64_t offset, int nr_sectors)
{
struct bcache_device *d = c->devices[inode];
unsigned stripe_size, stripe_offset;
uint64_t stripe;
if (!d)
return;
stripe_size = 1 << d->stripe_size_bits;
stripe = offset >> d->stripe_size_bits;
stripe_offset = offset & (stripe_size - 1);
while (nr_sectors) {
int s = min_t(unsigned, abs(nr_sectors),
stripe_size - stripe_offset);
if (nr_sectors < 0)
s = -s;
atomic_add(s, d->stripe_sectors_dirty + stripe);
nr_sectors -= s;
stripe_offset = 0;
stripe++;
}
}
/* Background writeback - IO loop */
static void dirty_io_destructor(struct closure *cl)
@@ -392,8 +419,9 @@ static int bch_btree_sectors_dirty_init(struct btree *b, struct btree_op *op,
break;
if (KEY_DIRTY(k))
atomic_long_add(KEY_SIZE(k),
&dc->disk.sectors_dirty);
bcache_dev_sectors_dirty_add(b->c, dc->disk.id,
KEY_START(k),
KEY_SIZE(k));
} else {
btree(sectors_dirty_init, k, b, op, dc);
if (KEY_INODE(k) > dc->disk.id)