blk-cgroup: always display debug stats in io.stat#611
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Remove the blkcg_debug_stats toggle and always display detailed statistics in the cgroup io.stat file. This includes use_delay and delay_nsec information, cost.wait/cost.indebt/cost.indelay for iocost, and latency statistics for iolatency. The stats are already being collected regardless of the toggle, so gating their display provides no real benefit. Additionally, blk-cgroup has not been modularized since commit 32e380a ("blkcg: make CONFIG_BLK_CGROUP bool"), making the module parameter a historical artifact. Readers of the nested-keys format should be able to handle additional fields. Before (without blkcg_debug_stats enabled): 253:0 rbytes=6273024 wbytes=0 rios=20 wios=0 dbytes=0 dios=0 cost.usage=0 After: 253:0 rbytes=6273024 wbytes=0 rios=20 wios=0 dbytes=0 dios=0 cost.usage=0 cost.wait=0 cost.indebt=0 cost.indelay=0 Suggested-by: Michal Koutný <mkoutny@suse.com> Signed-off-by: Breno Leitao <leitao@debian.org>
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Pull request for series with
subject: blk-cgroup: always display debug stats in io.stat
version: 2
url: https://patchwork.kernel.org/project/linux-block/list/?series=1060656