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authorLinus Torvalds <torvalds@linux-foundation.org>2011-11-06 19:02:23 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-11-06 19:02:23 -0800
commit208bca0860406d16398145ddd950036a737c3c9d (patch)
tree7797a16c17d8bd155120126fa7976727fc6de013 /include/linux
parent6aad3738f6a79fd0ca480eaceefe064cc471f6eb (diff)
parent0e175a1835ffc979e55787774e58ec79e41957d7 (diff)
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Merge branch 'writeback-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux
* 'writeback-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux: writeback: Add a 'reason' to wb_writeback_work writeback: send work item to queue_io, move_expired_inodes writeback: trace event balance_dirty_pages writeback: trace event bdi_dirty_ratelimit writeback: fix ppc compile warnings on do_div(long long, unsigned long) writeback: per-bdi background threshold writeback: dirty position control - bdi reserve area writeback: control dirty pause time writeback: limit max dirty pause time writeback: IO-less balance_dirty_pages() writeback: per task dirty rate limit writeback: stabilize bdi->dirty_ratelimit writeback: dirty rate control writeback: add bg_threshold parameter to __bdi_update_bandwidth() writeback: dirty position control writeback: account per-bdi accumulated dirtied pages
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/backing-dev.h14
-rw-r--r--include/linux/sched.h7
-rw-r--r--include/linux/writeback.h33
3 files changed, 47 insertions, 7 deletions
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 3b2f9cb82986..b1038bd686ac 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -40,6 +40,7 @@ typedef int (congested_fn)(void *, int);
enum bdi_stat_item {
BDI_RECLAIMABLE,
BDI_WRITEBACK,
+ BDI_DIRTIED,
BDI_WRITTEN,
NR_BDI_STAT_ITEMS
};
@@ -74,10 +75,20 @@ struct backing_dev_info {
struct percpu_counter bdi_stat[NR_BDI_STAT_ITEMS];
unsigned long bw_time_stamp; /* last time write bw is updated */
+ unsigned long dirtied_stamp;
unsigned long written_stamp; /* pages written at bw_time_stamp */
unsigned long write_bandwidth; /* the estimated write bandwidth */
unsigned long avg_write_bandwidth; /* further smoothed write bw */
+ /*
+ * The base dirty throttle rate, re-calculated on every 200ms.
+ * All the bdi tasks' dirty rate will be curbed under it.
+ * @dirty_ratelimit tracks the estimated @balanced_dirty_ratelimit
+ * in small steps and is much more smooth/stable than the latter.
+ */
+ unsigned long dirty_ratelimit;
+ unsigned long balanced_dirty_ratelimit;
+
struct prop_local_percpu completions;
int dirty_exceeded;
@@ -107,7 +118,8 @@ int bdi_register(struct backing_dev_info *bdi, struct device *parent,
int bdi_register_dev(struct backing_dev_info *bdi, dev_t dev);
void bdi_unregister(struct backing_dev_info *bdi);
int bdi_setup_and_register(struct backing_dev_info *, char *, unsigned int);
-void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages);
+void bdi_start_writeback(struct backing_dev_info *bdi, long nr_pages,
+ enum wb_reason reason);
void bdi_start_background_writeback(struct backing_dev_info *bdi);
int bdi_writeback_thread(void *data);
int bdi_has_dirty_io(struct backing_dev_info *bdi);
diff --git a/include/linux/sched.h b/include/linux/sched.h
index e8acce717d2a..68daf4f27e2c 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1522,6 +1522,13 @@ struct task_struct {
int make_it_fail;
#endif
struct prop_local_single dirties;
+ /*
+ * when (nr_dirtied >= nr_dirtied_pause), it's time to call
+ * balance_dirty_pages() for some dirty throttling pause
+ */
+ int nr_dirtied;
+ int nr_dirtied_pause;
+
#ifdef CONFIG_LATENCYTOP
int latency_record_count;
struct latency_record latency_record[LT_SAVECOUNT];
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 2b8963ff0f35..a378c295851f 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -39,6 +39,23 @@ enum writeback_sync_modes {
};
/*
+ * why some writeback work was initiated
+ */
+enum wb_reason {
+ WB_REASON_BACKGROUND,
+ WB_REASON_TRY_TO_FREE_PAGES,
+ WB_REASON_SYNC,
+ WB_REASON_PERIODIC,
+ WB_REASON_LAPTOP_TIMER,
+ WB_REASON_FREE_MORE_MEM,
+ WB_REASON_FS_FREE_SPACE,
+ WB_REASON_FORKER_THREAD,
+
+ WB_REASON_MAX,
+};
+extern const char *wb_reason_name[];
+
+/*
* A control structure which tells the writeback code what to do. These are
* always on the stack, and hence need no locking. They are always initialised
* in a manner such that unspecified fields are set to zero.
@@ -69,14 +86,17 @@ struct writeback_control {
*/
struct bdi_writeback;
int inode_wait(void *);
-void writeback_inodes_sb(struct super_block *);
-void writeback_inodes_sb_nr(struct super_block *, unsigned long nr);
-int writeback_inodes_sb_if_idle(struct super_block *);
-int writeback_inodes_sb_nr_if_idle(struct super_block *, unsigned long nr);
+void writeback_inodes_sb(struct super_block *, enum wb_reason reason);
+void writeback_inodes_sb_nr(struct super_block *, unsigned long nr,
+ enum wb_reason reason);
+int writeback_inodes_sb_if_idle(struct super_block *, enum wb_reason reason);
+int writeback_inodes_sb_nr_if_idle(struct super_block *, unsigned long nr,
+ enum wb_reason reason);
void sync_inodes_sb(struct super_block *);
-long writeback_inodes_wb(struct bdi_writeback *wb, long nr_pages);
+long writeback_inodes_wb(struct bdi_writeback *wb, long nr_pages,
+ enum wb_reason reason);
long wb_do_writeback(struct bdi_writeback *wb, int force_wait);
-void wakeup_flusher_threads(long nr_pages);
+void wakeup_flusher_threads(long nr_pages, enum wb_reason reason);
/* writeback.h requires fs.h; it, too, is not included from here. */
static inline void wait_on_inode(struct inode *inode)
@@ -143,6 +163,7 @@ unsigned long bdi_dirty_limit(struct backing_dev_info *bdi,
void __bdi_update_bandwidth(struct backing_dev_info *bdi,
unsigned long thresh,
+ unsigned long bg_thresh,
unsigned long dirty,
unsigned long bdi_thresh,
unsigned long bdi_dirty,