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[RFC PATCH 00/10] sched: Task placement for heterogeneous MP systems
From: Morten Rasmussen <morten.rasmussen@arm.com> Hi Paul, Paul, Peter, Suresh, linaro-sched-sig, and LKML, As a follow-up on my Linux Plumbers Conference talk about my experiments with scheduling on heterogeneous systems I'm posting a ...
Message posted on the September 21st, 2012 - 2:40 PM ET
[PATCH bisected regression] sched: rebuild sched domains at suspend/resume
This is fix for suspend/resume regression introduced in commit 8f2f748b0656 ("CPU hotplug, cpusets, suspend: Don't touch cpusets during suspend/resume") Without this patch suspend always hangs on my thinkpad x220 (2 x CPU * HT). ...
Message posted on the March 6th, 2012 - 3:50 PM ET
[RFC PATCH 00/13] sched: Integrating Per-entity-load-tracking with the core scheduler
This patchset uses the per-entity-load-tracking patchset which will soon be available in the kernel.It is based on the tip/master tree before the (HEAD at b654f92c06e562c)integration of per-entity-load-tracking patchset. The first 8 latest patches ...
Message posted on the October 25th, 2012 - 6:30 AM ET
[discussion]sched: a rough proposal to enable power saving in scheduler
Since there is no power saving consideration in scheduler CFS, I has a very rough idea for enabling a new power saving schema in CFS. It bases on the following assumption: 1, If there are many task crowd in system, just let few domain cpus running ...
Message posted on the August 13th, 2012 - 8:30 AM ET
[PATCH] sched: Avoid side-effect of tickless idle on update_cpu_load (v2)
tickless idle has a negative side effect on update_cpu_load(), which in turn can affect load balancing behavior. update_cpu_load() is supposed to be called every tick, to keep track of various load indicies. With tickless idle, there are no ...
Message posted on the May 14th, 2010 - 9:30 PM ET
[PATCH] sched/numa: recovered SD_PERFER_SIBLING on CPU domain
commit 8e7fbcbc22c(sched: Remove stale power aware scheduling remnants and dysfunctional knobs) removed SD_PERFER_SIBLING on CPU domain On numa machine, that causes load_balance didn't perfer LCPU in same physical CPU package. It causes some ...
Message posted on the July 20th, 2012 - 2:20 AM ET
[RFC PATCH 0/2] sched: Load Balancing using Per-entity-Load-tracking
Hi everyone, This patchset uses the per-entity-load-tracking patchset which will soon be available in the kernel.It is based on the tip/master tree and the first 8 latest patches of sched:per-entity-load-tracking alone have been imported to the ...
Message posted on the October 12th, 2012 - 1:00 AM ET
[PATCH] sched: fix sched-domain avg_load calculation.
In function find_busiest_group(), the sched-domain avg_load isn't calculated at all if there is a group imbalance within the domain. This will cause erroneous imbalance calculation. The reason is that calculate_imbalance() sees sds->avg_load = 0 ...
Message posted on the April 7th, 2011 - 8:30 PM ET
[PATCH] scheduler: domain: init next_balance in nohz_idle_balancer with jiffies
From: Diwakar Tundlam <dtundlam@nvidia.com> The next_balance parameter of nohz_idle_balancer should be initialized to jiffies since jiffies itself is initialized to 300 seconds shy of overflow. Otherwise, nohz_idle_balancer does not run for ...
Message posted on the January 30th, 2012 - 7:50 AM ET
[PATCH] sched: Avoid side-effect of tickless idle on update_cpu_load
tickless idle has a negative side effect on update_cpu_load(), which in turn can affect load balancing behavior. update_cpu_load() is supposed to be called every tick, to keep track of various load indicies. With tickless idle, there are no ...
Message posted on the May 7th, 2010 - 9:50 PM ET
[PATCH v8] sched: fix init NOHZ_IDLE flag
On my smp platform which is made of 5 cores in 2 clusters, I have the nr_busy_cpu field of sched_group_power struct that is not null when the platform is fully idle. The root cause is: During the boot sequence, some CPUs reach the idle loop and set ...
Message posted on the April 23rd, 2013 - 11:10 AM ET
[RFC PATCH] sched/numa: do load balance between remote nodes
commit cb83b629b remove the NODE sched domain and check if the node distance in SLIT table is farther than REMOTE_DISTANCE, if so, it will lose the load balance chance at exec/fork/wake_affine points. But actually, even the node distance is farther ...
Message posted on the June 6th, 2012 - 3:00 AM ET
[PATCH] sched: wakeup buddy
Log since RFC: 1. Small fix (thanks to Namhyung). 2. Remove the logical branch which will bind two task on same cpu (thanks to Mike). wake_affine() stuff is trying to bind related tasks closely, but it doesn't work well according to the test on ...
Message posted on the March 6th, 2013 - 2:10 AM ET
[PATCH RFC] sched: Make migration_call() safe for stop_machine()-free hotplug
The CPU_DYING branch of migration_call() relies on the fact that CPU-hotplug offline operations use stop_machine(). This commit therefore attempts to remedy this situation by acquiring the relevant runqueue locks. Note that sched_ttwu_pending() ...
Message posted on the July 25th, 2012 - 6:00 PM ET