[PATCH 7/7] writeback: add some debug inode list counters to bdi stats

Jens Axboe
2009-03-12T14:36:22Z

Not meant for inclusion, just to monitor what is going on while testing
this stuff.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---
mm/backing-dev.c | 19 +++++++++++++++++--
1 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 500d1fc..76a7809 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -46,6 +46,18 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v)
unsigned long background_thresh;
unsigned long dirty_thresh;
unsigned long bdi_thresh;
+ unsigned long nr_dirty, nr_io, nr_more_io;
+ struct inode *inode;
+
+ nr_dirty = nr_io = nr_more_io = 0;
+ spin_lock(&inode_lock);
+ list_for_each_entry(inode, &bdi->b_dirty, i_list)
+ nr_dirty++;
+ list_for_each_entry(inode, &bdi->b_io, i_list)
+ nr_io++;
+ list_for_each_entry(inode, &bdi->b_more_io, i_list)
+ nr_more_io++;
+ spin_unlock(&inode_lock);

get_dirty_limits(&background_thresh, &dirty_thresh, &bdi_thresh, bdi);

@@ -55,12 +67,15 @@ static int bdi_debug_stats_show(struct seq_file *m, void *v)
"BdiReclaimable: %8lu kB\n"
"BdiDirtyThresh: %8lu kB\n"
"DirtyThresh: %8lu kB\n"
- "BackgroundThresh: %8lu kB\n",
+ "BackgroundThresh: %8lu kB\n"
+ "b_dirty: %8lu\n"
+ "b_io: %8lu\n"
+ "b_more_io: %8lu\n",
(unsigned long) K(bdi_stat(bdi, BDI_WRITEBACK)),
(unsigned long) K(bdi_stat(bdi, BDI_RECLAIMABLE)),
K(bdi_thresh),
K(dirty_thresh),
- K(background_thresh));
+ K(background_thresh), nr_dirty, nr_io, nr_more_io);
#undef K

return 0;
--
1.6.2