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authorShaohua Li <shli@fb.com>2017-07-12 11:49:55 -0700
committerJens Axboe <axboe@kernel.dk>2017-07-29 09:00:03 -0600
commit69fd5c391763bd94a40dd152bc72a7f230137150 (patch)
tree9f44111556c0f8ac14410703a79c42289ea768c2 /kernel/cgroup
parent007cc56b7eeca8848021bc43aca2b8607fbe5589 (diff)
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blktrace: add an option to allow displaying cgroup path
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>
Diffstat (limited to 'kernel/cgroup')
-rw-r--r--kernel/cgroup/cgroup.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index 6cefa277f39c..2aba1c519138 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -4701,6 +4701,18 @@ static int __init cgroup_wq_init(void)
}
core_initcall(cgroup_wq_init);
+void cgroup_path_from_kernfs_id(const union kernfs_node_id *id,
+ char *buf, size_t buflen)
+{
+ struct kernfs_node *kn;
+
+ kn = kernfs_get_node_by_id(cgrp_dfl_root.kf_root, id);
+ if (!kn)
+ return;
+ kernfs_path(kn, buf, buflen);
+ kernfs_put(kn);
+}
+
/*
* proc_cgroup_show()
* - Print task's cgroup paths into seq_file, one line for each hierarchy