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authorTejun Heo <tj@kernel.org>2019-08-29 15:47:19 -0700
committerJens Axboe <axboe@kernel.dk>2019-08-30 07:42:49 -0600
commit3a8e9ac89e6a5106cfb6b85d4c9cf9bfa3519bc7 (patch)
tree690ba707f1bd5b427751ff434fc27ae7fd022ab0 /fs/fs-writeback.c
parente916ad29d96485e5aa3d3237bfeab1522c713d5e (diff)
writeback: add tracepoints for cgroup foreign writebacks
cgroup foreign inode handling has quite a bit of heuristics and internal states which sometimes makes it difficult to understand what's going on. Add tracepoints to improve visibility. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/fs-writeback.c')
-rw-r--r--fs/fs-writeback.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 658dc16c9e6d..8aaa7eec7b74 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -389,6 +389,8 @@ static void inode_switch_wbs_work_fn(struct work_struct *work)
if (unlikely(inode->i_state & I_FREEING))
goto skip_switch;
+ trace_inode_switch_wbs(inode, old_wb, new_wb);
+
/*
* Count and transfer stats. Note that PAGECACHE_TAG_DIRTY points
* to possibly dirty pages while PAGECACHE_TAG_WRITEBACK points to
@@ -673,6 +675,9 @@ void wbc_detach_inode(struct writeback_control *wbc)
if (wbc->wb_id != max_id)
history |= (1U << slots) - 1;
+ if (history)
+ trace_inode_foreign_history(inode, wbc, history);
+
/*
* Switch if the current wb isn't the consistent winner.
* If there are multiple closely competing dirtiers, the