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bcache: Write out full stripes

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Now that we're tracking dirty data per stripe, we can add two
optimizations for raid5/6:

 * If a stripe is already dirty, force writes to that stripe to
   writeback mode - to help build up full stripes of dirty data

 * When flushing dirty data, preferentially write out full stripes first
   if there are any.

Signed-off-by: Kent Overstreet <koverstreet@google.com>
This commit is contained in:
Kent Overstreet
2013-06-05 06:24:39 -07:00
parent 279afbad4e
commit 72c270612b
9 changed files with 121 additions and 37 deletions
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3
drivers/md/bcache/bcache.h
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@@ -387,8 +387,6 @@ struct keybuf_key {
typedef bool (keybuf_pred_fn)(struct keybuf *, struct bkey *);
struct keybuf {
keybuf_pred_fn *key_predicate;
struct bkey last_scanned;
spinlock_t lock;
@@ -532,6 +530,7 @@ struct cached_dev {
unsigned sequential_merge:1;
unsigned verify:1;
unsigned partial_stripes_expensive:1;
unsigned writeback_metadata:1;
unsigned writeback_running:1;
unsigned char writeback_percent;