linux/kernel/kthread.c, branch v2.6.37

kthread_work: make lockdep happy

2010-12-22T09:27:53Z

spinlock in kthread_worker and wait_queue_head in kthread_work both should be lockdep sensible, so change the interface to make it suiltable for CONFIG_LOCKDEP. tj: comment update Reported-by: Nicolas Signed-off-by: Yong Zhang Signed-off-by: Andy Walls Tested-by: Andy Walls Cc: Tejun Heo Cc: Andrew Morton Signed-off-by: Tejun Heo

kthread: implement kthread_data()

2010-06-29T08:07:09Z

Implement kthread_data() which takes @task pointing to a kthread and returns @data specified when creating the kthread. The caller is responsible for ensuring the validity of @task when calling this function. Signed-off-by: Tejun Heo

kthread: implement kthread_worker

2010-06-29T08:07:09Z

Implement simple work processor for kthread. This is to ease using kthread. Single thread workqueue used to be used for things like this but workqueue won't guarantee fixed kthread association anymore to enable worker sharing. This can be used in cases where specific kthread association is necessary, for example, when it should have RT priority or be assigned to certain cgroup. Signed-off-by: Tejun Heo Cc: Andrew Morton

cpuset: fix the problem that cpuset_mem_spread_node() returns an offline node

2010-03-24T23:31:21Z

cpuset_mem_spread_node() returns an offline node, and causes an oops. This patch fixes it by initializing task->mems_allowed to node_states[N_HIGH_MEMORY], and updating task->mems_allowed when doing memory hotplug. Signed-off-by: Miao Xie Acked-by: David Rientjes Reported-by: Nick Piggin Tested-by: Nick Piggin Cc: Paul Menage Cc: Li Zefan Cc: Ingo Molnar Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

kthread, sched: Remove reference to kthread_create_on_cpu

2010-02-09T10:47:39Z

kthread_create_on_cpu doesn't exist so update a comment in kthread.c to reflect this. Signed-off-by: Anton Blanchard Acked-by: Rusty Russell Cc: Peter Zijlstra LKML-Reference: <20100209040740.GB3702@kryten> Signed-off-by: Ingo Molnar

sched: Move kthread_bind() back to kthread.c

2009-12-16T18:01:57Z

Since kthread_bind() lost its dependencies on sched.c, move it back where it came from. Signed-off-by: Peter Zijlstra Cc: Mike Galbraith LKML-Reference: <20091216170518.039524041@chello.nl> Signed-off-by: Ingo Molnar

sched: Fix kthread_bind() by moving the body of kthread_bind() to sched.c

2009-11-03T06:25:00Z

Eric Paris reported that commit f685ceacab07d3f6c236f04803e2f2f0dbcc5afb causes boot time PREEMPT_DEBUG complaints. [ 4.590699] BUG: using smp_processor_id() in preemptible [00000000] code: rmmod/1314 [ 4.593043] caller is task_hot+0x86/0xd0 Since kthread_bind() messes with scheduler internals, move the body to sched.c, and lock the runqueue. Reported-by: Eric Paris Signed-off-by: Mike Galbraith Tested-by: Eric Paris Cc: Peter Zijlstra LKML-Reference: <1256813310.7574.3.camel@marge.simson.net> [ v2: fix !SMP build and clean up ] Signed-off-by: Ingo Molnar

sched: Keep kthreads at default priority

2009-09-09T15:30:06Z

Removes kthread/workqueue priority boost, they increase worst-case desktop latencies. Signed-off-by: Mike Galbraith Acked-by: Peter Zijlstra LKML-Reference: <1252486344.28645.18.camel@marge.simson.net> Signed-off-by: Ingo Molnar

update the comment in kthread_stop()

2009-07-27T19:15:46Z

Commit 63706172f332fd3f6e7458ebfb35fa6de9c21dc5 ("kthreads: rework kthread_stop()") removed the limitation that the thread function mysr not call do_exit() itself, but forgot to update the comment. Since that commit it is OK to use kthread_stop() even if kthread can exit itself. Signed-off-by: Oleg Nesterov Signed-off-by: Rusty Russell Signed-off-by: Linus Torvalds

kthreads: rework kthread_stop()

2009-06-18T20:03:54Z

Based on Eric's patch which in turn was based on my patch. kthread_stop() has the nasty problems: - it runs unpredictably long with the global semaphore held. - it deadlocks if kthread itself does kthread_stop() before it obeys the kthread_should_stop() request. - it is not useable if kthread exits on its own, see for example the ugly "wait_to_die:" hack in migration_thread() - it is not possible to just tell kthread it should stop, we must always wait for its exit. With this patch kthread() allocates all neccesary data (struct kthread) on its own stack, globals kthread_stop_xxx are deleted. ->vfork_done is used as a pointer into "struct kthread", this means kthread_stop() can easily wait for kthread's exit. Signed-off-by: Oleg Nesterov Cc: Christoph Hellwig Cc: "Eric W. Biederman" Cc: Ingo Molnar Cc: Pavel Emelyanov Cc: Rusty Russell Cc: Vitaliy Gusev Signed-off-by: Linus Torvalds