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Diffstat (limited to 'block/blk-iocost.c')
| -rw-r--r-- | block/blk-iocost.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/block/blk-iocost.c b/block/blk-iocost.c index 680815620095..3208d2fdc55e 100644 --- a/block/blk-iocost.c +++ b/block/blk-iocost.c @@ -149,6 +149,27 @@ * donate and should take back how much requires hweight propagations * anyway making it easier to implement and understand as a separate * mechanism. + * + * 3. Monitoring + * + * Instead of debugfs or other clumsy monitoring mechanisms, this + * controller uses a drgn based monitoring script - + * tools/cgroup/iocost_monitor.py. For details on drgn, please see + * https://github.com/osandov/drgn. The ouput looks like the following. + * + * sdb RUN per=300ms cur_per=234.218:v203.695 busy= +1 vrate= 62.12% + * active weight hweight% inflt% del_ms usages% + * test/a * 50/ 50 33.33/ 33.33 27.65 0*041 033:033:033 + * test/b * 100/ 100 66.67/ 66.67 17.56 0*000 066:079:077 + * + * - per : Timer period + * - cur_per : Internal wall and device vtime clock + * - vrate : Device virtual time rate against wall clock + * - weight : Surplus-adjusted and configured weights + * - hweight : Surplus-adjusted and configured hierarchical weights + * - inflt : The percentage of in-flight IO cost at the end of last period + * - del_ms : Deferred issuer delay induction level and duration + * - usages : Usage history */ #include <linux/kernel.h> |