diff mbox series

[RFC,v2,4/8] smp: Trace IPIs sent via arch_send_call_function_ipi_mask()

Message ID 20221102183336.3120536-3-vschneid@redhat.com
State New
Headers
Series Generic IPI sending tracepoint |

Commit Message

Valentin Schneider Nov. 2, 2022, 6:33 p.m. UTC 
  This simply wraps around the arch function and prepends it with a
tracepoint, similar to send_call_function_single_ipi().

Signed-off-by: Valentin Schneider <vschneid@redhat.com>
---
 kernel/smp.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

Comments

Peter Zijlstra Nov. 17, 2022, 9:08 a.m. UTC | #1 
On Wed, Nov 02, 2022 at 06:33:32PM +0000, Valentin Schneider wrote:
> This simply wraps around the arch function and prepends it with a
> tracepoint, similar to send_call_function_single_ipi().
> 
> Signed-off-by: Valentin Schneider <vschneid@redhat.com>
> ---
>  kernel/smp.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/kernel/smp.c b/kernel/smp.c
> index e2ca1e2f31274..c4d561cf50d45 100644
> --- a/kernel/smp.c
> +++ b/kernel/smp.c
> @@ -160,6 +160,13 @@ void __init call_function_init(void)
>  	smpcfd_prepare_cpu(smp_processor_id());
>  }
>  
> +static inline void

Given the use of _RET_IP_, I would strongly recommend you use
__always_inline.

> +send_call_function_ipi_mask(const struct cpumask *mask)
> +{
> +	trace_ipi_send_cpumask(mask, _RET_IP_, func);

What's func?

> +	arch_send_call_function_ipi_mask(mask);
> +}
Valentin Schneider Nov. 17, 2022, 2:23 p.m. UTC | #2 
On 17/11/22 10:08, Peter Zijlstra wrote:
> On Wed, Nov 02, 2022 at 06:33:32PM +0000, Valentin Schneider wrote:
>> This simply wraps around the arch function and prepends it with a
>> tracepoint, similar to send_call_function_single_ipi().
>>
>> Signed-off-by: Valentin Schneider <vschneid@redhat.com>
>> ---
>>  kernel/smp.c | 9 ++++++++-
>>  1 file changed, 8 insertions(+), 1 deletion(-)
>>
>> diff --git a/kernel/smp.c b/kernel/smp.c
>> index e2ca1e2f31274..c4d561cf50d45 100644
>> --- a/kernel/smp.c
>> +++ b/kernel/smp.c
>> @@ -160,6 +160,13 @@ void __init call_function_init(void)
>>      smpcfd_prepare_cpu(smp_processor_id());
>>  }
>>
>> +static inline void
>
> Given the use of _RET_IP_, I would strongly recommend you use
> __always_inline.
>

Noted, thanks

>> +send_call_function_ipi_mask(const struct cpumask *mask)
>> +{
>> +	trace_ipi_send_cpumask(mask, _RET_IP_, func);
>
> What's func?
>

A rebase fail... That's only plugged in later.

>> +	arch_send_call_function_ipi_mask(mask);
>> +}
diff mbox series

Patch

diff --git a/kernel/smp.c b/kernel/smp.c
index e2ca1e2f31274..c4d561cf50d45 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -160,6 +160,13 @@  void __init call_function_init(void)
 	smpcfd_prepare_cpu(smp_processor_id());
 }
 
+static inline void
+send_call_function_ipi_mask(const struct cpumask *mask)
+{
+	trace_ipi_send_cpumask(mask, _RET_IP_, func);
+	arch_send_call_function_ipi_mask(mask);
+}
+
 #ifdef CONFIG_CSD_LOCK_WAIT_DEBUG
 
 static DEFINE_STATIC_KEY_FALSE(csdlock_debug_enabled);
@@ -970,7 +977,7 @@  static void smp_call_function_many_cond(const struct cpumask *mask,
 		if (nr_cpus == 1)
 			send_call_function_single_ipi(last_cpu);
 		else if (likely(nr_cpus > 1))
-			arch_send_call_function_ipi_mask(cfd->cpumask_ipi);
+			send_call_function_ipi_mask(cfd->cpumask_ipi);
 
 		cfd_seq_store(this_cpu_ptr(&cfd_seq_local)->pinged, this_cpu, CFD_SEQ_NOCPU, CFD_SEQ_PINGED);
 	}