On Mon, Oct 22, 2007 at 02:21:21PM +0200, Maxim Levitsky wrote:
> I Bisected this bug to exactly this commit:
>
> 2e6883bdf49abd0e7f0d9b6297fc3be7ebb2250b
> writeback: introduce writeback_control.more_io to indicate more io
>
> Reverting it and compiling latest git shows no more signs of that bug.
Thank you very much.
I guess your system has some difficulty in writing back some inodes.
(i.e. a bug disclosed by this patch, the 100% iowait only makes it
more obvious)
I cannot reproduce it with your .config, so would you recompile and
run the kernel with the above commit _and_ the below debugging patch?
Thank you,
Fengguang
---
fs/fs-writeback.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
--- linux-2.6.23-git17.orig/fs/fs-writeback.c
+++ linux-2.6.23-git17/fs/fs-writeback.c
@@ -164,12 +164,25 @@ static void redirty_tail(struct inode *i
list_move(&inode->i_list, &sb->s_dirty);
}
+#define requeue_io(inode) \
+ do { \
+ __requeue_io(inode, __LINE__); \
+ } while (0)
+
/*
* requeue inode for re-scanning after sb->s_io list is exhausted.
*/
-static void requeue_io(struct inode *inode)
+static void __requeue_io(struct inode *inode, int line)
{
list_move(&inode->i_list, &inode->i_sb->s_more_io);
+
+ printk(KERN_DEBUG "redirtied inode %lu size %llu at %02x:%02x(%s), line %d.\n",
+ inode->i_ino,
+ i_size_read(inode),
+ MAJOR(inode->i_sb->s_dev),
+ MINOR(inode->i_sb->s_dev),
+ inode->i_sb->s_id,
+ line);
}
static void inode_sync_complete(struct inode *inode)
-
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