netdev - Re: [RFC PATCH v3 2/5] napi: convert trace_napi_poll to TRACE

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Date:	Wed, 21 Jul 2010 07:24:53 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Koki Sanagi <sanagi.koki@...fujitsu.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	davem@...emloft.net, kaneshige.kenji@...fujitsu.com,
	izumi.taku@...fujitsu.com, kosaki.motohiro@...fujitsu.com,
	laijs@...fujitsu.com, scott.a.mcmillan@...el.com,
	rostedt@...dmis.org, eric.dumazet@...il.com, fweisbec@...il.com,
	mathieu.desnoyers@...ymtl.ca
Subject: Re: [RFC PATCH v3 2/5] napi: convert trace_napi_poll to TRACE_EVENT

On Wed, Jul 21, 2010 at 04:00:15PM +0900, Koki Sanagi wrote:
> (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@...driver.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@...driver.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@...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.
> 
My fault, sorry.  I misunderstood what the macro change was doing here.  It
should be fine.

Thanks
Neil

> Thanks,
> Koki Sanagi.
> 
> > --
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> > 
> > 
> 
> 
> 
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