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blktrace: add an option to allow displaying cgroup path

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By default we output cgroup id in blktrace. This adds an option to
display cgroup path. Since get cgroup path is a relativly heavy
operation, we don't enable it by default.

with the option enabled, blktrace will output something like this:
dd-1353  [007] d..2   293.015252:   8,0   /test/level  D   R 24 + 8 [dd]

Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Shaohua Li
2017-07-12 11:49:55 -07:00
committed by Jens Axboe
parent 007cc56b7e
commit 69fd5c3917
5 changed files with 52 additions and 1 deletions
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2
include/linux/kernfs.h
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@@ -358,6 +358,8 @@ struct super_block *kernfs_pin_sb(struct kernfs_root *root, const void *ns);
void kernfs_init(void);
struct kernfs_node *kernfs_get_node_by_id(struct kernfs_root *root,
const union kernfs_node_id *id);
#else /* CONFIG_KERNFS */
static inline enum kernfs_node_type kernfs_type(struct kernfs_node *kn)