linux-kernel - [PATCH 0/4] sched: Display deadline bandwidth and other SCHED

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Date:	Mon, 22 Feb 2016 16:26:49 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	linux-kernel@...r.kernel.org
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Juri Lelli <juri.lelli@...il.com>,
	Clark Williams <williams@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 0/4] sched: Display deadline bandwidth and other SCHED_DEBUG clean up

[ Nothing different since my v2 I posted, except hopefully people
  will look at it this time :-) I also removed the RFC ]

I'm starting to play with SCHED_DEADLINE a bit and I'm able to cause
a bandwidth "leak". Then I realized there's no way to examine what bandwidths
are enabled on which CPUs. I added the bandwith ratios to the
/proc/sched_debug file.

I will be posting the SCHED_DEADLINE issue in a separate thread.

# grep dl /proc/sched_debug         
dl_rq[0]:
  .dl_nr_running                 : 0
  .dl_bw->bw                     : 996147
  .dl_bw->total_bw               : 0
dl_rq[1]:
  .dl_nr_running                 : 0
  .dl_bw->bw                     : 996147
  .dl_bw->total_bw               : 104857
dl_rq[2]:
  .dl_nr_running                 : 0
  .dl_bw->bw                     : 996147
  .dl_bw->total_bw               : 0
dl_rq[3]:
  .dl_nr_running                 : 0
  .dl_bw->bw                     : 996147
  .dl_bw->total_bw               : 0
dl_rq[4]:
  .dl_nr_running                 : 0
  .dl_bw->bw                     : 996147
  .dl_bw->total_bw               : 0
dl_rq[5]:
  .dl_nr_running                 : 0
  .dl_bw->bw                     : 996147
  .dl_bw->total_bw               : 0
dl_rq[6]:
  .dl_nr_running                 : 0
  .dl_bw->bw                     : 996147
  .dl_bw->total_bw               : 0
dl_rq[7]:
  .dl_nr_running                 : 0
  .dl_bw->bw                     : 996147
  .dl_bw->total_bw               : 0

Before adding this code, I also realized there was a bit of 
SCHED_DEBUG code in the kernel/sched/core.c file, and decided to move that
to kernel/sched/debug.c to clean the core.c file up a bit. Those patches
are mostly orthognal to the deadline_bw file, but decided to group them
together here.


Steven Rostedt (Red Hat) (4):
      sched: Move sched_feature file setup into debug.c
      sched: Move sched_domain_sysctl to debug.c
      sched: Add bandwidth ratio to /proc/sched_debug
      tracing: Add __print_ns_to_secs() and __print_ns_without_secs() helpers

----
 include/trace/trace_events.h |  25 ++++
 kernel/sched/core.c          | 311 ------------------------------------------
 kernel/sched/debug.c         | 313 +++++++++++++++++++++++++++++++++++++++++++
 kernel/sched/sched.h         |  13 ++
 4 files changed, 351 insertions(+), 311 deletions(-)