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Re: [PATCH V5 00/11] blktrace: output cgroup info

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On 07/12/2017 12:49 PM, Shaohua Li wrote:
> From: Shaohua Li <shli@fb.com>
> 
> Hi,
> 
> Currently blktrace isn't cgroup aware. blktrace prints out task name of current
> context, but the task of current context isn't always in the cgroup where the
> BIO comes from. We can't use task name to find out IO cgroup. For example,
> Writeback BIOs always comes from flusher thread but the BIOs are for different
> blk cgroups. Request could be requeued and dispatched from completely different
> tasks. MD/DM are another examples. This brings challenges if we want to use
> blktrace for performance tunning with cgroup enabled.
> 
> This patchset try to fix the gap. We print out cgroup fhandle info in blktrace.
> Userspace can use open_by_handle_at() syscall to find the cgroup by fhandle. Or
> userspace can use name_to_handle_at() syscall to find fhandle for a cgroup and
> use a BPF program to filter out blktrace for a specific cgroup.
> 
> The first 6 patches adds export operation handlers for kernfs, so userspace can
> use open_by_handle_at/name_to_handle_at to a kernfs file. Later patches make
> blktrace output cgroup info.

Added for 4.14, thanks Shaohua.

-- 
Jens Axboe

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[PATCH V5 00/11] blktrace: output cgroup info Shaohua Li <shli@kernel.org> - 2017-07-12 21:00 +0200
  [PATCH V5 11/11] block: use standard blktrace API to output cgroup info for debug notes Shaohua Li <shli@kernel.org> - 2017-07-12 21:00 +0200
  [PATCH V5 07/11] cgroup: export fhandle info for a cgroup Shaohua Li <shli@kernel.org> - 2017-07-12 21:00 +0200
  [PATCH V5 10/11] blktrace: add an option to allow displaying cgroup path Shaohua Li <shli@kernel.org> - 2017-07-12 21:00 +0200
  [PATCH V5 08/11] blktrace: export cgroup info in trace Shaohua Li <shli@kernel.org> - 2017-07-12 21:00 +0200
  [PATCH V5 02/11] kernfs: implement i_generation Shaohua Li <shli@kernel.org> - 2017-07-12 21:00 +0200
  [PATCH V5 06/11] kernfs: add exportfs operations Shaohua Li <shli@kernel.org> - 2017-07-12 21:00 +0200
  [PATCH V5 09/11] block: always attach cgroup info into bio Shaohua Li <shli@kernel.org> - 2017-07-12 21:00 +0200
  [PATCH V5 05/11] kernfs: introduce kernfs_node_id Shaohua Li <shli@kernel.org> - 2017-07-12 21:00 +0200
  [PATCH V5 04/11] kernfs: don't set dentry->d_fsdata Shaohua Li <shli@kernel.org> - 2017-07-12 21:00 +0200
  [PATCH V5 03/11] kernfs: add an API to get kernfs node from inode number Shaohua Li <shli@kernel.org> - 2017-07-12 21:00 +0200
  [PATCH V5 01/11] kernfs: use idr instead of ida to manage inode number Shaohua Li <shli@kernel.org> - 2017-07-12 21:00 +0200
  Re: [PATCH V5 00/11] blktrace: output cgroup info Jens Axboe <axboe@kernel.dk> - 2017-07-13 01:00 +0200

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