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2012-08-13smpboot: Provide infrastructure for percpu hotplug threadsThomas Gleixner1-0/+4
Provide a generic interface for setting up and tearing down percpu threads. On registration the threads for already online cpus are created and started. On deregistration (modules) the threads are stoppped. During hotplug operations the threads are created, started, parked and unparked. The datastructure for registration provides a pointer to percpu storage space and optional setup, cleanup, park, unpark functions. These functions are called when the thread state changes. Each implementation has to provide a function which is queried and returns whether the thread should run and the thread function itself. The core code handles all state transitions and avoids duplicated code in the call sites. [ paulmck: Preemption leak fix ] Signed-off-by: Thomas Gleixner <[email protected]> Cc: Peter Zijlstra <[email protected]> Reviewed-by: Srivatsa S. Bhat <[email protected]> Cc: Rusty Russell <[email protected]> Reviewed-by: Paul E. McKenney <[email protected]> Cc: Namhyung Kim <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Thomas Gleixner <[email protected]>
2012-06-11smpboot: Remove leftover declarationThomas Gleixner1-2/+0
Signed-off-by: Thomas Gleixner <[email protected]>
2012-05-04smp: Fix idle_thread_init() inline stubThomas Gleixner1-1/+1
idle_thread_init() does not have arguments. Reported-by: Ingo Molnar <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]>
2012-05-03smp, idle: Allocate idle thread for each possible cpu during bootSuresh Siddha1-0/+2
percpu areas are already allocated during boot for each possible cpu. percpu idle threads can be considered as an extension of the percpu areas, and allocate them for each possible cpu during boot. This will eliminate the need for workqueue based idle thread allocation. In future we can move the idle thread area into the percpu area too. [ tglx: Moved the loop into smpboot.c and added an error check when the init code failed to allocate an idle thread for a cpu which should be onlined ] Signed-off-by: Suresh Siddha <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Rusty Russell <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Srivatsa S. Bhat <[email protected]> Cc: Tejun Heo <[email protected]> Cc: David Rientjes <[email protected]> Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Thomas Gleixner <[email protected]>
2012-04-26smp: Provide generic idle thread allocationThomas Gleixner1-0/+10
All SMP architectures have magic to fork the idle task and to store it for reusage when cpu hotplug is enabled. Provide a generic infrastructure for it. Create/reinit the idle thread for the cpu which is brought up in the generic code and hand the thread pointer to the architecture code via __cpu_up(). Note, that fork_idle() is called via a workqueue, because this guarantees that the idle thread does not get a reference to a user space VM. This can happen when the boot process did not bring up all possible cpus and a later cpu_up() is initiated via the sysfs interface. In that case fork_idle() would be called in the context of the user space task and take a reference on the user space VM. Signed-off-by: Thomas Gleixner <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Rusty Russell <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Srivatsa S. Bhat <[email protected]> Cc: Matt Turner <[email protected]> Cc: Russell King <[email protected]> Cc: Mike Frysinger <[email protected]> Cc: Jesper Nilsson <[email protected]> Cc: Richard Kuo <[email protected]> Cc: Tony Luck <[email protected]> Cc: Hirokazu Takata <[email protected]> Cc: Ralf Baechle <[email protected]> Cc: David Howells <[email protected]> Cc: James E.J. Bottomley <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Martin Schwidefsky <[email protected]> Cc: Paul Mundt <[email protected]> Cc: David S. Miller <[email protected]> Cc: Chris Metcalf <[email protected]> Cc: Richard Weinberger <[email protected]> Cc: [email protected] Acked-by: Venkatesh Pallipadi <[email protected]> Link: http://lkml.kernel.org/r/[email protected]
2012-04-26smp: Add generic smpboot facilityThomas Gleixner1-0/+6
Start a new file, which will hold SMP and CPU hotplug related generic infrastructure. Signed-off-by: Thomas Gleixner <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Rusty Russell <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Srivatsa S. Bhat <[email protected]> Cc: Matt Turner <[email protected]> Cc: Russell King <[email protected]> Cc: Mike Frysinger <[email protected]> Cc: Jesper Nilsson <[email protected]> Cc: Richard Kuo <[email protected]> Cc: Tony Luck <[email protected]> Cc: Hirokazu Takata <[email protected]> Cc: Ralf Baechle <[email protected]> Cc: David Howells <[email protected]> Cc: James E.J. Bottomley <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Martin Schwidefsky <[email protected]> Cc: Paul Mundt <[email protected]> Cc: David S. Miller <[email protected]> Cc: Chris Metcalf <[email protected]> Cc: Richard Weinberger <[email protected]> Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected]
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