[PATCH] sched: provide scheduler_ipi() callback in response to smp_send_reschedule()
ddaney at caviumnetworks.com
Tue Jan 18 06:18:57 EST 2011
On 01/17/2011 03:07 AM, Peter Zijlstra wrote:
> For future rework of try_to_wake_up() we'd like to push part of that
> onto the CPU the task is actually going to run on, in order to do so we
> need a generic callback from the existing scheduler IPI.
> This patch introduces such a generic callback: scheduler_ipi() and
> implements it as a NOP.
> I visited existing smp_send_reschedule() implementations and tried to
> add a call to scheduler_ipi() in their handler part, but esp. for MIPS
> I'm not quite sure I actually got all of them.
> Also, while reading through all this, I noticed the blackfin SMP code
> looks to be broken, it simply discards any IPI when low on memory.
> Signed-off-by: Peter Zijlstra<a.p.zijlstra at chello.nl>
> arch/alpha/kernel/smp.c | 1 +
> arch/arm/kernel/smp.c | 1 +
> arch/blackfin/mach-common/smp.c | 3 ++-
> arch/cris/arch-v32/kernel/smp.c | 13 ++++++++-----
> arch/ia64/kernel/irq_ia64.c | 2 ++
> arch/ia64/xen/irq_xen.c | 10 +++++++++-
> arch/m32r/kernel/smp.c | 2 +-
> arch/mips/kernel/smtc.c | 1 +
> arch/mips/sibyte/bcm1480/smp.c | 7 +++----
> arch/mips/sibyte/sb1250/smp.c | 7 +++----
You will also have to patch the mailbox_interrupt() function in
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