On Wed, 2011-02-09 at 17:14 +1100, Benjamin Herrenschmidt wrote:
> On Mon, 2011-02-07 at 14:54 +0100, Peter Zijlstra wrote:
> > On Mon, 2011-02-07 at 10:26 +1100, Benjamin Herrenschmidt wrote:
> > > You missed:
> > >
> > > diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
> > > in
On Mon, 2011-02-07 at 14:54 +0100, Peter Zijlstra wrote:
> On Mon, 2011-02-07 at 10:26 +1100, Benjamin Herrenschmidt wrote:
> > You missed:
> >
> > diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
> > index 9813605..467d122 100644
> > --- a/arch/powerpc/kernel/smp.c
> > +++ b/arc
On Mon, 2011-02-07 at 10:26 +1100, Benjamin Herrenschmidt wrote:
> You missed:
>
> diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
> index 9813605..467d122 100644
> --- a/arch/powerpc/kernel/smp.c
> +++ b/arch/powerpc/kernel/smp.c
> @@ -98,6 +98,7 @@ void smp_message_recv(int ms
On Mon, 2011-01-17 at 12:07 +0100, Peter Zijlstra wrote:
> diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
> index 68034bb..7ee0fc3 100644
> --- a/arch/powerpc/kernel/smp.c
> +++ b/arch/powerpc/kernel/smp.c
> @@ -128,6 +128,7 @@ static irqreturn_t call_function_action(int irq, vo
On Tue, 2011-01-18 at 07:31 +1100, Benjamin Herrenschmidt wrote:
>
> Beware of false positive, I've used "fake" reschedule IPIs in the past
> for other things (like kicking a CPU out of sleep state for unrelated
> reasons). Nothing that I know that is upstream today but some of that
> might come b
On Mon, 2011-01-17 at 12:07 +0100, 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 gene
On Mon, 2011-01-17 at 14:49 -0500, Mike Frysinger wrote:
> On Mon, Jan 17, 2011 at 06:07, Peter Zijlstra wrote:
> > 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.
>
> not really. see changelog of commit
On Mon, Jan 17, 2011 at 06:07, Peter Zijlstra wrote:
> 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.
not really. see changelog of commit 73a400646b8e26615f3ef1a0a4bc0cd0d5bd284c.
-mike
___
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: sched
On Mon, Jan 17, 2011 at 12:41:49PM +0100, Peter Zijlstra wrote:
> Index: linux-2.6/arch/cris/arch-v32/kernel/smp.c
> ===
> --- linux-2.6.orig/arch/cris/arch-v32/kernel/smp.c
> +++ linux-2.6/arch/cris/arch-v32/kernel/smp.c
> @@ -340,15
On 1/17/2011 6:41 AM, Peter Zijlstra wrote:
> Index: linux-2.6/arch/tile/kernel/smp.c
> ===
> --- linux-2.6.orig/arch/tile/kernel/smp.c
> +++ linux-2.6/arch/tile/kernel/smp.c
> @@ -184,12 +184,8 @@ void flush_icache_range(unsigned long
On Mon, 17 Jan 2011 12:07:13 +0100
Peter Zijlstra wrote:
> 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.
>
> diff --git a/arch/s390/kernel/smp.c b/ar
On Mon, Jan 17, 2011 at 12:41:49PM +0100, Peter Zijlstra wrote:
> ===
> --- linux-2.6.orig/arch/arm/kernel/smp.c
> +++ linux-2.6/arch/arm/kernel/smp.c
> @@ -575,10 +575,7 @@ asmlinkage void __exception do_IPI(struc
>
On Mon, Jan 17, 2011 at 12:07:13PM +0100, Peter Zijlstra wrote:
> diff --git a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c
> index 42aa078..c4a570b 100644
> --- a/arch/alpha/kernel/smp.c
> +++ b/arch/alpha/kernel/smp.c
> @@ -587,6 +587,7 @@ handle_ipi(struct pt_regs *regs)
> cas
On Mon, 2011-01-17 at 12:31 +0100, Peter Zijlstra wrote:
> On Mon, 2011-01-17 at 11:26 +, Russell King - ARM Linux wrote:
> > Maybe remove the comment "everything is done on the interrupt return path"
> > as with this function call, that is no longer the case.
(Removed am33, m32r-ka, m32r, ar
On Mon, 2011-01-17 at 11:26 +, Russell King - ARM Linux wrote:
> On Mon, Jan 17, 2011 at 12:07:13PM +0100, Peter Zijlstra wrote:
> > diff --git a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c
> > index 42aa078..c4a570b 100644
> > --- a/arch/alpha/kernel/smp.c
> > +++ b/arch/alpha/kernel/smp
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 visite
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