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writeback: add more tracepoints

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Add tracepoints for page dirtying, writeback_single_inode start, inode
dirtying and writeback.  For the latter two inode events, a pair of
events are defined to denote start and end of the operations (the
starting one has _start suffix and the one w/o suffix happens after
the operation is complete).  These inode ops are FS specific and can
be non-trivial and having enclosing tracepoints is useful for external
tracers.

This is part of tracepoint additions to improve visiblity into
dirtying / writeback operations for io tracer and userland.

v2: writeback_dirty_inode[_start] TPs may be called for files on
    pseudo FSes w/ unregistered bdi.  Check whether bdi->dev is %NULL
    before dereferencing.

v3: buffer dirtying moved to a block TP.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo
2013-01-11 13:06:37 -08:00
committed by Jens Axboe
parent 5305cb8308
commit 9fb0a7da0c
3 changed files with 132 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/trace/events/writeback.h
+116
View File
@@ -32,6 +32,115 @@
struct wb_writeback_work;
TRACE_EVENT(writeback_dirty_page,
TP_PROTO(struct page *page, struct address_space *mapping),
TP_ARGS(page, mapping),
TP_STRUCT__entry (
__array(char, name, 32)
__field(unsigned long, ino)
__field(pgoff_t, index)
),
TP_fast_assign(
strncpy(__entry->name,
mapping ? dev_name(mapping->backing_dev_info->dev) : "(unknown)", 32);
__entry->ino = mapping ? mapping->host->i_ino : 0;
__entry->index = page->index;
),
TP_printk("bdi %s: ino=%lu index=%lu",
__entry->name,
__entry->ino,
__entry->index
)
);
DECLARE_EVENT_CLASS(writeback_dirty_inode_template,
TP_PROTO(struct inode *inode, int flags),
TP_ARGS(inode, flags),
TP_STRUCT__entry (
__array(char, name, 32)
__field(unsigned long, ino)
__field(unsigned long, flags)
),
TP_fast_assign(
struct backing_dev_info *bdi = inode->i_mapping->backing_dev_info;
/* may be called for files on pseudo FSes w/ unregistered bdi */
strncpy(__entry->name,
bdi->dev ? dev_name(bdi->dev) : "(unknown)", 32);
__entry->ino = inode->i_ino;
__entry->flags = flags;
),
TP_printk("bdi %s: ino=%lu flags=%s",
__entry->name,
__entry->ino,
show_inode_state(__entry->flags)
)
);
DEFINE_EVENT(writeback_dirty_inode_template, writeback_dirty_inode_start,
TP_PROTO(struct inode *inode, int flags),
TP_ARGS(inode, flags)
);
DEFINE_EVENT(writeback_dirty_inode_template, writeback_dirty_inode,
TP_PROTO(struct inode *inode, int flags),
TP_ARGS(inode, flags)
);
DECLARE_EVENT_CLASS(writeback_write_inode_template,
TP_PROTO(struct inode *inode, struct writeback_control *wbc),
TP_ARGS(inode, wbc),
TP_STRUCT__entry (
__array(char, name, 32)
__field(unsigned long, ino)
__field(int, sync_mode)
),
TP_fast_assign(
strncpy(__entry->name,
dev_name(inode->i_mapping->backing_dev_info->dev), 32);
__entry->ino = inode->i_ino;
__entry->sync_mode = wbc->sync_mode;
),
TP_printk("bdi %s: ino=%lu sync_mode=%d",
__entry->name,
__entry->ino,
__entry->sync_mode
)
);
DEFINE_EVENT(writeback_write_inode_template, writeback_write_inode_start,
TP_PROTO(struct inode *inode, struct writeback_control *wbc),
TP_ARGS(inode, wbc)
);
DEFINE_EVENT(writeback_write_inode_template, writeback_write_inode,
TP_PROTO(struct inode *inode, struct writeback_control *wbc),
TP_ARGS(inode, wbc)
);
DECLARE_EVENT_CLASS(writeback_work_class,
TP_PROTO(struct backing_dev_info *bdi, struct wb_writeback_work *work),
TP_ARGS(bdi, work),
@@ -479,6 +588,13 @@ DECLARE_EVENT_CLASS(writeback_single_inode_template,
)
);
DEFINE_EVENT(writeback_single_inode_template, writeback_single_inode_start,
TP_PROTO(struct inode *inode,
struct writeback_control *wbc,
unsigned long nr_to_write),
TP_ARGS(inode, wbc, nr_to_write)
);
DEFINE_EVENT(writeback_single_inode_template, writeback_single_inode,
TP_PROTO(struct inode *inode,
struct writeback_control *wbc,