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SubjectRe: [RFC PATCH v3 2/5] napi: convert trace_napi_poll to TRACE_EVENT
(2010/07/20 20:09), Neil Horman wrote:
> On Tue, Jul 20, 2010 at 09:46:51AM +0900, Koki Sanagi wrote:
>> From: Neil Horman <nhorman@tuxdriver.com>
>>
>> This patch converts trace_napi_poll from DECLARE_EVENT to TRACE_EVENT to improve
>> the usability of napi_poll tracepoint.
>>
>> <idle>-0 [001] 241302.750777: napi_poll: napi poll on napi struct f6acc480 for device eth3
>> <idle>-0 [000] 241302.852389: napi_poll: napi poll on napi struct f5d0d70c for device eth1
>>
>> An original patch is below.
>> http://marc.info/?l=linux-kernel&m=126021713809450&w=2
>> Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
>>
>> And add a fix by Steven Rostedt.
>> http://marc.info/?l=linux-kernel&m=126150506519173&w=2
>>
>> Signed-off-by: Koki Sanagi <sanagi.koki@jp.fujitsu.com>
>> ---
>> include/trace/events/napi.h | 25 +++++++++++++++++++++++--
>> 1 files changed, 23 insertions(+), 2 deletions(-)
>>
>> diff --git a/include/trace/events/napi.h b/include/trace/events/napi.h
>> index 188deca..8fe1e93 100644
>> --- a/include/trace/events/napi.h
>> +++ b/include/trace/events/napi.h
>> @@ -6,10 +6,31 @@
>>
>> #include <linux/netdevice.h>
>> #include <linux/tracepoint.h>
>> +#include <linux/ftrace.h>
>> +
>> +#define NO_DEV "(no_device)"
>> +
>> +TRACE_EVENT(napi_poll,
>>
>> -DECLARE_TRACE(napi_poll,
>> TP_PROTO(struct napi_struct *napi),
>> - TP_ARGS(napi));
>> +
>> + TP_ARGS(napi),
>> +
>> + TP_STRUCT__entry(
>> + __field( struct napi_struct *, napi)
>> + __string( dev_name, napi->dev ? napi->dev->name : NO_DEV)
>> + ),
>> +
>> + TP_fast_assign(
>> + __entry->napi = napi;
>> + __assign_str(dev_name, napi->dev ? napi->dev->name : NO_DEV);
>> + ),
>> +
>> + TP_printk("napi poll on napi struct %p for device %s",
>> + __entry->napi, __get_str(dev_name))
>> +);
>> +
>> +#undef NO_DEV
>>
>> #endif /* _TRACE_NAPI_H_ */
>>
>>
> NAK, This change will create a build break in the drop monitor code. You'll
> need to fix that up if you want to make this change.
> Neil
>
I built a kernel with CONFIG_NET_DROP_MONITOR=y.
But build break did not occur.

Thanks,
Koki Sanagi.

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