Disown it, and only display autogroup association if one exists.
Signed-off-by: Mike Galbraith <efault@gmx.de>
Reviewed-by: Yong Zhang <yong.zhang0@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1298383320.8036.5.camel@marge.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
when autogroup is disable from the beginning,
sched_autogroup_create_attach()
autogroup_move_group() <== 1
sched_move_task() <== 2
task_move_group_fair()
set_task_rq()
task_group()
autogroup_task_group()
We go the whole path without doing anything useful.
Then stop going further if autogroup is disabled.
But there will be a race window between 1 and 2, in which
sysctl_sched_autogroup_enabled is enabled. This issue
will be toke by following patch.
Signed-off-by: Yong Zhang <yong.zhang0@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <1298185696-4403-4-git-send-email-yong.zhang0@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Add autogroup name to cfs_rq and tasks information to /proc/sched_debug.
Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20110111101257.GF4772@in.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
autogroup_init() is only called at boot time.
Signed-off-by: Yong Zhang <yong.zhang0@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1294375425-31065-1-git-send-email-yong.zhang0@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Oleg pointed out that the /proc interface kref_get() useage may race with
the final put during autogroup_move_group(). A signal->autogroup assignment
may be in flight when the /proc interface dereference, leaving them taking
a reference to an already dead group.
Reported-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1292508592.5940.28.camel@maggy.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
A recurring complaint from CFS users is that parallel kbuild has
a negative impact on desktop interactivity. This patch
implements an idea from Linus, to automatically create task
groups. Currently, only per session autogroups are implemented,
but the patch leaves the way open for enhancement.
Implementation: each task's signal struct contains an inherited
pointer to a refcounted autogroup struct containing a task group
pointer, the default for all tasks pointing to the
init_task_group. When a task calls setsid(), a new task group
is created, the process is moved into the new task group, and a
reference to the preveious task group is dropped. Child
processes inherit this task group thereafter, and increase it's
refcount. When the last thread of a process exits, the
process's reference is dropped, such that when the last process
referencing an autogroup exits, the autogroup is destroyed.
At runqueue selection time, IFF a task has no cgroup assignment,
its current autogroup is used.
Autogroup bandwidth is controllable via setting it's nice level
through the proc filesystem:
cat /proc/<pid>/autogroup
Displays the task's group and the group's nice level.
echo <nice level> > /proc/<pid>/autogroup
Sets the task group's shares to the weight of nice <level> task.
Setting nice level is rate limited for !admin users due to the
abuse risk of task group locking.
The feature is enabled from boot by default if
CONFIG_SCHED_AUTOGROUP=y is selected, but can be disabled via
the boot option noautogroup, and can also be turned on/off on
the fly via:
echo [01] > /proc/sys/kernel/sched_autogroup_enabled
... which will automatically move tasks to/from the root task group.
Signed-off-by: Mike Galbraith <efault@gmx.de>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Markus Trippelsdorf <markus@trippelsdorf.de>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Paul Turner <pjt@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
[ Removed the task_group_path() debug code, and fixed !EVENTFD build failure. ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
LKML-Reference: <1290281700.28711.9.camel@maggy.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
HDMI clock is not auto dvfs, so we need set the clock rate to 0 if HDMI
is disabled. Otherwise the Vdd core voltage will be always 1.2v even
after HDMI cable unplugged.
BUG 828306
Reviewed-on: http://git-master/r/34379
(cherry picked from commit 58ddd144a6c2dd9bbc9d2f3c8b1e025364d88c22)
Change-Id: Ie4a7ba9dfc765ca3a9e4c443112364230338896c
Reviewed-on: http://git-master/r/37180
Reviewed-by: Rohan Somvanshi <rsomvanshi@nvidia.com>
Tested-by: Rohan Somvanshi <rsomvanshi@nvidia.com>
If the screen is idle (no POST for some time), reduce the DC EMC clock
according the windows size. If external display connected, the EMC clock
will not be reduced.
BUG 828306
Reviewed-on: http://git-master/r/37106
Change-Id: I88c76ef3afe5036f47d91f6540846fd767c399e4
Reviewed-on: http://git-master/r/38149
Reviewed-by: Xin Xie <xxie@nvidia.com>
Tested-by: Xin Xie <xxie@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Conflicts:
drivers/video/tegra/dc/dc.c
drivers/video/tegra/dc/dc_priv.h
drivers/video/tegra/dc/overlay.c
Restore the target cpu frequency on exit from suspend. Also save target
frequency if set when the device is suspended.
Bug 841559
Change-Id: Id17a5945215e324d49e3d74b9603cc919a736c64
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-on: http://git-master/r/41710
Reviewed-by: Scott Williams <scwilliams@nvidia.com>
Reviewed-by: Aleksandr Frid <afrid@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Need cache maintenance on rw_handle to remove
display garbage issue which happens randomly.
Change-Id: I73606ae6551c0e75058e055f4a19e5f074a47004
Signed-off-by: Greg Roth <groth@nvidia.com>
The prefetcher fetches a total of 128 bytes, and then responding to
sequential reads with this prefetched data. To avoid coherency issues,
it discards the prefetched data if a non sequential read occurs.
Allocate dtd with 128 bytes boundary to make 2 consecutive dtd 128 bytes
apart.
Submitted on behalf of Jay Cheng <jacheng@nvidia.com>
Change-Id: I2adc02c2ac7901d0617b487cb498a34ec7a63e18
Signed-off-by: James Wylder <james.wylder@motorola.com>
Submission from Jay Cheng <jacheng@nvidia.com>.
Change-Id: Ic92befe618adc7bdd12c35374fb3f855d7f6a515
Signed-off-by: Mike Corrigan <michael.corrigan@motorola.com>
Need maximum memory bandwidth to support bi-directional
transfers on multiple endpoints.
Change-Id: Idfd74c62ea0438fca7b93e82a6032a28feeab830
Signed-off-by: James Wylder <james.wylder@motorola.com>
Submitted on behalf of Jay Cheng <jacheng@nvidia.com>
Change-Id: I8552e995ee5c124023dd7f5385e8ecca7a50eee8
Signed-off-by: James Wylder <james.wylder@motorola.com>
Submitted on behalf of Jay Cheng <jacheng@nvidia.com>
Modified to use syscore_ops
Change-Id: Ic8a3a9559634eb3f1f0e4b40a2d8502d20d606d6
Signed-off-by: Benoit Goby <benoit@android.com>
Enabling AHB prefetch on USB1, USB2, USB3 controllers,
to improve the USB transfer throughput.
originally work from Rakesh Bodla <rbodla@nvidia.com>
Change-Id: I3c45bb8e97ceffbf43229b9c3d9581a565b61187
Signed-off-by: James Wylder <james.wylder@motorola.com>
Optimization that primarily addresses when cpu frequency
is low but a high memory bandwidth is needed.
Change-Id: I4f800c2368191c744aefd9f83eb96e4c108dbcc3
Signed-off-by: James Wylder <james.wylder@motorola.com>
The Launchpad kernel uses different voltages in the kernel to the Tiamat, and this commit sets the default voltages that were carried over with TDR's voltage control commit back to our default voltages.
