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Commit 001a541e authored by Linus Torvalds's avatar Linus Torvalds
Browse files

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: move MIN_WRITEBACK_PAGES to fs-writeback.c
  writeback: balanced_rate cannot exceed write bandwidth
  writeback: do strict bdi dirty_exceeded
  writeback: avoid tiny dirty poll intervals
  writeback: max, min and target dirty pause time
  writeback: dirty ratelimit - think time compensation
  btrfs: fix dirtied pages accounting on sub-page writes
  writeback: fix dirtied pages accounting on redirty
  writeback: fix dirtied pages accounting on sub-page writes
  writeback: charge leaked page dirties to active tasks
  writeback: Include all dirty inodes in background writeback
parents 40ba5879 bc31b86a

fs/btrfs/file.c

+2 −1
Original line number Diff line number Diff line
@@ -1136,7 +1136,8 @@ again: 
				     GFP_NOFS);

	}

	for (i = 0; i < num_pages; i++) {

		clear_page_dirty_for_io(pages[i]);

		if (clear_page_dirty_for_io(pages[i]))

			account_page_redirty(pages[i]);

		set_page_extent_mapped(pages[i]);

		WARN_ON(!PageLocked(pages[i]));

	}

fs/fs-writeback.c

+14 −2
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
#include <linux/sched.h>

#include <linux/fs.h>

#include <linux/mm.h>

#include <linux/pagemap.h>

#include <linux/kthread.h>

#include <linux/freezer.h>

#include <linux/writeback.h>
@@ -28,6 +29,11 @@ 
#include <linux/tracepoint.h>

#include "internal.h"



/*

 * 4MB minimal write chunk size

 */

#define MIN_WRITEBACK_PAGES	(4096UL >> (PAGE_CACHE_SHIFT - 10))



/*

 * Passed into wb_writeback(), essentially a subset of writeback_control

 */
@@ -742,11 +748,17 @@ static long wb_writeback(struct bdi_writeback *wb, 
		if (work->for_background && !over_bground_thresh(wb->bdi))

			break;



		/*

		 * Kupdate and background works are special and we want to

		 * include all inodes that need writing. Livelock avoidance is

		 * handled by these works yielding to any other work so we are

		 * safe.

		 */

		if (work->for_kupdate) {

			oldest_jif = jiffies -

				msecs_to_jiffies(dirty_expire_interval * 10);

			work->older_than_this = &oldest_jif;

		}

		} else if (work->for_background)

			oldest_jif = jiffies;



		trace_writeback_start(wb->bdi, work);

		if (list_empty(&wb->b_io))

include/linux/sched.h

+1 −0
Original line number Diff line number Diff line
@@ -1544,6 +1544,7 @@ struct task_struct { 
	 */

	int nr_dirtied;

	int nr_dirtied_pause;

	unsigned long dirty_paused_when; /* start of a write-and-pause period */



#ifdef CONFIG_LATENCYTOP

	int latency_record_count;

include/linux/writeback.h

+4 −5
Original line number Diff line number Diff line
@@ -7,6 +7,8 @@ 
#include <linux/sched.h>

#include <linux/fs.h>



DECLARE_PER_CPU(int, dirty_throttle_leaks);



/*

 * The 1/4 region under the global dirty thresh is for smooth dirty throttling:

 *
@@ -23,11 +25,6 @@ 
#define DIRTY_SCOPE		8

#define DIRTY_FULL_SCOPE	(DIRTY_SCOPE / 2)



/*

 * 4MB minimal write chunk size

 */

#define MIN_WRITEBACK_PAGES	(4096UL >> (PAGE_CACHE_SHIFT - 10))



struct backing_dev_info;



/*
@@ -194,6 +191,8 @@ void writeback_set_ratelimit(void); 
void tag_pages_for_writeback(struct address_space *mapping,

			     pgoff_t start, pgoff_t end);



void account_page_redirty(struct page *page);



/* pdflush.c */

extern int nr_pdflush_threads;	/* Global so it can be exported to sysctl

				   read-only. */

include/trace/events/writeback.h

+11 −3
Original line number Diff line number Diff line
@@ -300,12 +300,13 @@ TRACE_EVENT(balance_dirty_pages, 
		 unsigned long dirty_ratelimit,

		 unsigned long task_ratelimit,

		 unsigned long dirtied,

		 unsigned long period,

		 long pause,

		 unsigned long start_time),



	TP_ARGS(bdi, thresh, bg_thresh, dirty, bdi_thresh, bdi_dirty,

		dirty_ratelimit, task_ratelimit,

		dirtied, pause, start_time),

		dirtied, period, pause, start_time),



	TP_STRUCT__entry(

		__array(	 char,	bdi, 32)
@@ -320,6 +321,8 @@ TRACE_EVENT(balance_dirty_pages, 
		__field(unsigned int,	dirtied_pause)

		__field(unsigned long,	paused)

		__field(	 long,	pause)

		__field(unsigned long,	period)

		__field(	 long,	think)

	),



	TP_fast_assign(
@@ -336,6 +339,9 @@ TRACE_EVENT(balance_dirty_pages, 
		__entry->task_ratelimit	= KBps(task_ratelimit);

		__entry->dirtied	= dirtied;

		__entry->dirtied_pause	= current->nr_dirtied_pause;

		__entry->think		= current->dirty_paused_when == 0 ? 0 :

			 (long)(jiffies - current->dirty_paused_when) * 1000/HZ;

		__entry->period		= period * 1000 / HZ;

		__entry->pause		= pause * 1000 / HZ;

		__entry->paused		= (jiffies - start_time) * 1000 / HZ;

	),
@@ -346,7 +352,7 @@ TRACE_EVENT(balance_dirty_pages, 
		  "bdi_setpoint=%lu bdi_dirty=%lu "

		  "dirty_ratelimit=%lu task_ratelimit=%lu "

		  "dirtied=%u dirtied_pause=%u "

		  "paused=%lu pause=%ld",

		  "paused=%lu pause=%ld period=%lu think=%ld",

		  __entry->bdi,

		  __entry->limit,

		  __entry->setpoint,
@@ -358,7 +364,9 @@ TRACE_EVENT(balance_dirty_pages, 
		  __entry->dirtied,

		  __entry->dirtied_pause,

		  __entry->paused,	/* ms */

		  __entry->pause	/* ms */

		  __entry->pause,	/* ms */

		  __entry->period,	/* ms */

		  __entry->think	/* ms */

	  )

);