Re: [PATCH v3] blkcg: prevent priority inversion problem during sync()

Hi Andrea, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v5.0 next-20190306] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commit

Re: [PATCH v3] blkcg: prevent priority inversion problem during sync()

Hi Andrea, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v5.0 next-20190306] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commit

[PATCH v3] blkcg: prevent priority inversion problem during sync()

When sync(2) is executed from a high-priority cgroup, the process is forced to wait the completion of the entire outstanding writeback I/O, even the I/O that was originally generated by low-priority cgroups potentially. This may cause massive latencies to random processes (even those running in th