linux-toradex.git/kernel/sched/debug.c, branch v4.13-rc5

sched/debug: Expose the number of RT/DL tasks that can migrate

2017-06-30T07:32:07+00:00

Add the value of the rt_rq.rt_nr_migratory and dl_rq.dl_nr_migratory
to the sched_debug output, for instance:

 rt_rq[0]:
   .rt_nr_running                 : 2
   .rt_nr_migratory               : 1     <--- Like this
   .rt_throttled                  : 0
   .rt_time                       : 828.645877
   .rt_runtime                    : 1000.000000

This is useful to debug problems related to the RT/DL schedulers.

This also fixes the format of some variables, that were unsigned, rather
than signed.

Signed-off-by: Daniel Bristot de Oliveira 
Cc: Clark Williams 
Cc: Linus Torvalds 
Cc: Luis Claudio R. Goncalves 
Cc: Luiz Capitulino 
Cc: Peter Zijlstra 
Cc: Sebastian Andrzej Siewior 
Cc: Steven Rostedt 
Cc: Thomas Gleixner 
Cc: linux-rt-users 
Link: http://lkml.kernel.org/r/7896f71cada54ee7dd8507bb666063a2e051c3d4.1498482127.git.bristot@redhat.com
Signed-off-by: Ingo Molnar

sched/headers: Prepare to move the task_lock()/unlock() APIs to

2017-03-02T07:42:38+00:00

But first update the code that uses these facilities with the
new header.

Acked-by: Linus Torvalds 
Cc: Mike Galbraith 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar

sched/headers: Prepare to remove the dependency from

2017-03-02T07:42:37+00:00

Update code that relied on sched.h including various MM types for them.

This will allow us to remove the  include from .

Acked-by: Linus Torvalds 
Cc: Mike Galbraith 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar

sched/deadline: Show leftover runtime and abs deadline in /proc/*/sched

2017-01-14T10:30:00+00:00

This patch allows for reading the current (leftover) runtime and
absolute deadline of a SCHED_DEADLINE task through /proc/*/sched
(entries dl.runtime and dl.deadline), while debugging/testing.

Signed-off-by: Tommaso Cucinotta 
Signed-off-by: Peter Zijlstra (Intel) 
Reviewed-by: Juri Lelli 
Reviewed-by: Luca Abeni 
Acked-by: Daniel Bistrot de Oliveira 
Cc: Juri Lelli 
Cc: Linus Torvalds 
Cc: Mike Galbraith 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Link: http://lkml.kernel.org/r/1477473437-10346-2-git-send-email-tommaso.cucinotta@sssup.it
Signed-off-by: Ingo Molnar

Merge branch 'for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2016-10-14T19:18:50+00:00

Pull cgroup updates from Tejun Heo:

 - tracepoints for basic cgroup management operations added

 - kernfs and cgroup path formatting functions updated to behave in the
   style of strlcpy()

 - non-critical bug fixes

* 'for-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  blkcg: Unlock blkcg_pol_mutex only once when cpd == NULL
  cgroup: fix error handling regressions in proc_cgroup_show() and cgroup_release_agent()
  cpuset: fix error handling regression in proc_cpuset_show()
  cgroup: add tracepoints for basic operations
  cgroup: make cgroup_path() and friends behave in the style of strlcpy()
  kernfs: remove kernfs_path_len()
  kernfs: make kernfs_path*() behave in the style of strlcpy()
  kernfs: add dummy implementation of kernfs_path_from_node()

sched/debug: Remove several CONFIG_SCHEDSTATS guards

2016-09-05T11:29:47+00:00

Clean up the sched code by removing several of the CONFIG_SCHEDSTATS
guards, using schedstat_*() macros where needed.

Code size:

  !CONFIG_SCHEDSTATS defconfig:

      text	   data	    bss	     dec	    hex	filename
  10209818	4368184	1105920	15683922	 ef5152	vmlinux.before.nostats
  10209818	4368184	1105920	15683922	 ef5152	vmlinux.after.nostats

  CONFIG_SCHEDSTATS defconfig:

      text	   data	    bss	    dec	    hex	filename
  10214210	4370040	1105920	15690170	 ef69ba	vmlinux.before.stats
  10214210	4370680	1105920	15690810	 ef6c3a	vmlinux.after.stats

Signed-off-by: Josh Poimboeuf 
Signed-off-by: Peter Zijlstra (Intel) 
Cc: Linus Torvalds 
Cc: Matt Fleming 
Cc: Mel Gorman 
Cc: Peter Zijlstra 
Cc: Srikar Dronamraju 
Cc: Thomas Gleixner 
Link: http://lkml.kernel.org/r/e51e0ebe5af95ac295de720dd252e7c0d2142e4a.1466184592.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar

sched/debug: Rename 'schedstat_val()' -> 'schedstat_val_or_zero()'

2016-09-05T11:29:46+00:00

The schedstat_val() macro's behavior is kind of surprising: when
schedstat is runtime disabled, it returns zero.  Rename it to
schedstat_val_or_zero().

There's also a need for a similar macro which doesn't have the 'if
(schedstat_enable())' check, to avoid doing the check twice.  Create a
new 'schedstat_val()' macro for that.

Signed-off-by: Josh Poimboeuf 
Signed-off-by: Peter Zijlstra (Intel) 
Cc: Linus Torvalds 
Cc: Matt Fleming 
Cc: Mel Gorman 
Cc: Peter Zijlstra 
Cc: Srikar Dronamraju 
Cc: Thomas Gleixner 
Link: http://lkml.kernel.org/r/3bb1d2367d041fee333b0dde17171e709395b675.1466184592.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar

sched/debug: Clean up schedstat macros

2016-09-05T11:29:46+00:00

The schedstat_*() macros are inconsistent: most of them take a pointer
and a field which the macro combines, whereas schedstat_set() takes the
already combined ptr->field.

The already combined ptr->field argument is actually more intuitive and
easier to use, and there's no reason to require the user to split the
variable up, so convert the macros to use the combined argument.

Signed-off-by: Josh Poimboeuf 
Signed-off-by: Peter Zijlstra (Intel) 
Cc: Linus Torvalds 
Cc: Matt Fleming 
Cc: Mel Gorman 
Cc: Peter Zijlstra 
Cc: Srikar Dronamraju 
Cc: Thomas Gleixner 
Link: http://lkml.kernel.org/r/54953ca25bb579f3a5946432dee409b0e05222c6.1466184592.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar

cgroup: make cgroup_path() and friends behave in the style of strlcpy()

2016-08-10T15:23:44+00:00

cgroup_path() and friends used to format the path from the end and
thus the resulting path usually didn't start at the start of the
passed in buffer.  Also, when the buffer was too small, the partial
result was truncated from the head rather than tail and there was no
way to tell how long the full path would be.  These make the functions
less robust and more awkward to use.

With recent updates to kernfs_path(), cgroup_path() and friends can be
made to behave in strlcpy() style.

* cgroup_path(), cgroup_path_ns[_locked]() and task_cgroup_path() now
  always return the length of the full path.  If buffer is too small,
  it contains nul terminated truncated output.

* All users updated accordingly.

v2: cgroup_path() usage in kernel/sched/debug.c converted.

Signed-off-by: Tejun Heo 
Acked-by: Greg Kroah-Hartman 
Cc: Serge Hallyn 
Cc: Peter Zijlstra

sched/debug: Always show 'nr_migrations'

2016-06-08T12:34:49+00:00

The nr_migrations field is updated independently of CONFIG_SCHEDSTATS,
so it can be displayed regardless.

Signed-off-by: Josh Poimboeuf 
Signed-off-by: Peter Zijlstra (Intel) 
Acked-by: Mel Gorman 
Cc: Linus Torvalds 
Cc: Matt Fleming 
Cc: Peter Zijlstra 
Cc: Srikar Dronamraju 
Cc: Thomas Gleixner 
Link: http://lkml.kernel.org/r/5b1b04057ae2b14d73c2d03f56582c1d38cfe066.1464994423.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar