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| author |   Tejun Heo <tj@kernel.org> | 2015-05-22 17:13:22 -0400 |
|---|---|---|
| committer |   Jens Axboe <axboe@fb.com> | 2015-06-02 08:33:34 -0600 |
| commit | ec438699a9ae0856c2ce20a50dd39cdc7e92a732 (patch) | |
| tree | f7406e5c235380474bf829639feed12bf0711101 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | blkcg: add blkcg_root_css (diff) | |
| download | linux-dev-ec438699a9ae0856c2ce20a50dd39cdc7e92a732.tar.xz linux-dev-ec438699a9ae0856c2ce20a50dd39cdc7e92a732.zip | |
cgroup, block: implement task_get_css() and use it in bio_associate_current()
bio_associate_current() currently open codes task_css() and
css_tryget_online() to find and pin $current's blkcg css. Abstract it
into task_get_css() which is implemented from cgroup side. As a task
is always associated with an online css for every subsystem except
while the css_set update is propagating, task_get_css() retries till
css_tryget_online() succeeds.
This is a cleanup and shouldn't lead to noticeable behavior changes.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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