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writeback: remove writeback_control.more_io

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When wbc.more_io was first introduced, it indicates whether there are
at least one superblock whose s_more_io contains more IO work. Now with
the per-bdi writeback, it can be replaced with a simple b_more_io test.

Acked-by: Jan Kara <jack@suse.cz>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
This commit is contained in:
Wu Fengguang 2010-07-21 22:19:51 -06:00
parent 3efaf0faba
commit b7a2441f99
4 changed files with 5 additions and 16 deletions
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9
fs/fs-writeback.c
View file

@ -560,12 +560,8 @@ static int writeback_sb_inodes(struct super_block *sb, struct bdi_writeback *wb,
iput(inode); iput(inode);
cond_resched(); cond_resched();
spin_lock(&wb->list_lock); spin_lock(&wb->list_lock);
if (wbc->nr_to_write <= 0) { if (wbc->nr_to_write <= 0)
wbc->more_io = 1;
return 1; return 1;
}
if (!list_empty(&wb->b_more_io))
wbc->more_io = 1;
} }
/* b_io is empty */ /* b_io is empty */
return 1; return 1;
@ -708,7 +704,6 @@ static long wb_writeback(struct bdi_writeback *wb,
wbc.older_than_this = &oldest_jif; wbc.older_than_this = &oldest_jif;
} }
wbc.more_io = 0;
wbc.nr_to_write = write_chunk; wbc.nr_to_write = write_chunk;
wbc.pages_skipped = 0; wbc.pages_skipped = 0;
wbc.inodes_written = 0; wbc.inodes_written = 0;
@ -740,7 +735,7 @@ static long wb_writeback(struct bdi_writeback *wb,
/* /*
* No more inodes for IO, bail * No more inodes for IO, bail
*/ */
if (!wbc.more_io) if (list_empty(&wb->b_more_io))
break; break;
/* /*
* Nothing written. Wait for some inode to * Nothing written. Wait for some inode to

1
include/linux/writeback.h
View file

@ -46,7 +46,6 @@ struct writeback_control {
unsigned tagged_writepages:1; /* tag-and-write to avoid livelock */ unsigned tagged_writepages:1; /* tag-and-write to avoid livelock */
unsigned for_reclaim:1; /* Invoked from the page allocator */ unsigned for_reclaim:1; /* Invoked from the page allocator */
unsigned range_cyclic:1; /* range_start is cyclic */ unsigned range_cyclic:1; /* range_start is cyclic */
unsigned more_io:1; /* more io to be dispatched */
}; };
/* /*

6
include/trace/events/ext4.h
View file

@ -404,7 +404,6 @@ TRACE_EVENT(ext4_da_writepages_result,
__field( int, pages_written ) __field( int, pages_written )
__field( long, pages_skipped ) __field( long, pages_skipped )
__field( int, sync_mode ) __field( int, sync_mode )
__field( char, more_io )
__field( pgoff_t, writeback_index ) __field( pgoff_t, writeback_index )
), ),
@ -415,16 +414,15 @@ TRACE_EVENT(ext4_da_writepages_result,
__entry->pages_written = pages_written; __entry->pages_written = pages_written;
__entry->pages_skipped = wbc->pages_skipped; __entry->pages_skipped = wbc->pages_skipped;
__entry->sync_mode = wbc->sync_mode; __entry->sync_mode = wbc->sync_mode;
__entry->more_io = wbc->more_io;
__entry->writeback_index = inode->i_mapping->writeback_index; __entry->writeback_index = inode->i_mapping->writeback_index;
), ),
TP_printk("dev %d,%d ino %lu ret %d pages_written %d pages_skipped %ld " TP_printk("dev %d,%d ino %lu ret %d pages_written %d pages_skipped %ld "
" more_io %d sync_mode %d writeback_index %lu", "sync_mode %d writeback_index %lu",
MAJOR(__entry->dev), MINOR(__entry->dev), MAJOR(__entry->dev), MINOR(__entry->dev),
(unsigned long) __entry->ino, __entry->ret, (unsigned long) __entry->ino, __entry->ret,
__entry->pages_written, __entry->pages_skipped, __entry->pages_written, __entry->pages_skipped,
__entry->more_io, __entry->sync_mode, __entry->sync_mode,
(unsigned long) __entry->writeback_index) (unsigned long) __entry->writeback_index)
); );

5
include/trace/events/writeback.h
View file

@ -101,7 +101,6 @@ DECLARE_EVENT_CLASS(wbc_class,
__field(int, for_background) __field(int, for_background)
__field(int, for_reclaim) __field(int, for_reclaim)
__field(int, range_cyclic) __field(int, range_cyclic)
__field(int, more_io)
__field(unsigned long, older_than_this) __field(unsigned long, older_than_this)
__field(long, range_start) __field(long, range_start)
__field(long, range_end) __field(long, range_end)
@ -116,7 +115,6 @@ DECLARE_EVENT_CLASS(wbc_class,
__entry->for_background = wbc->for_background; __entry->for_background = wbc->for_background;
__entry->for_reclaim = wbc->for_reclaim; __entry->for_reclaim = wbc->for_reclaim;
__entry->range_cyclic = wbc->range_cyclic; __entry->range_cyclic = wbc->range_cyclic;
__entry->more_io = wbc->more_io;
__entry->older_than_this = wbc->older_than_this ? __entry->older_than_this = wbc->older_than_this ?
*wbc->older_than_this : 0; *wbc->older_than_this : 0;
__entry->range_start = (long)wbc->range_start; __entry->range_start = (long)wbc->range_start;
@ -124,7 +122,7 @@ DECLARE_EVENT_CLASS(wbc_class,
), ),
TP_printk("bdi %s: towrt=%ld skip=%ld mode=%d kupd=%d " TP_printk("bdi %s: towrt=%ld skip=%ld mode=%d kupd=%d "
"bgrd=%d reclm=%d cyclic=%d more=%d older=0x%lx " "bgrd=%d reclm=%d cyclic=%d older=0x%lx "
"start=0x%lx end=0x%lx", "start=0x%lx end=0x%lx",
__entry->name, __entry->name,
__entry->nr_to_write, __entry->nr_to_write,
@ -134,7 +132,6 @@ DECLARE_EVENT_CLASS(wbc_class,
__entry->for_background, __entry->for_background,
__entry->for_reclaim, __entry->for_reclaim,
__entry->range_cyclic, __entry->range_cyclic,
__entry->more_io,
__entry->older_than_this, __entry->older_than_this,
__entry->range_start, __entry->range_start,
__entry->range_end) __entry->range_end)