linux-kernel - Re: [PATCH net-next v2] page_pool: Add page_pool_release

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Message-ID: <2a8dcd09-fc28-4fbc-b8f5-a4f89d05a30a@linux.dev>
Date: Fri, 2 Jan 2026 23:54:20 +0800
From: Leon Hwang <leon.hwang@...ux.dev>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: netdev@...r.kernel.org, Jesper Dangaard Brouer <hawk@...nel.org>,
 Ilias Apalodimas <ilias.apalodimas@...aro.org>,
 Masami Hiramatsu <mhiramat@...nel.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 "David S . Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
 kerneljasonxing@...il.com, lance.yang@...ux.dev, jiayuan.chen@...ux.dev,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 Leon Huang Fu <leon.huangfu@...pee.com>
Subject: Re: [PATCH net-next v2] page_pool: Add page_pool_release_stalled
 tracepoint

On 2026/1/2 23:45, Steven Rostedt wrote:
> On Fri,  2 Jan 2026 14:17:18 +0800
> Leon Hwang <leon.hwang@...ux.dev> wrote:
> 
>> diff --git a/include/trace/events/page_pool.h b/include/trace/events/page_pool.h
>> index 31825ed30032..c34de6a5ae80 100644
>> --- a/include/trace/events/page_pool.h
>> +++ b/include/trace/events/page_pool.h
>> @@ -113,6 +113,30 @@ TRACE_EVENT(page_pool_update_nid,
>>  		  __entry->pool, __entry->pool_nid, __entry->new_nid)
>>  );
>>  
>> +TRACE_EVENT(page_pool_release_stalled,
>> +
>> +	TP_PROTO(const struct page_pool *pool, int inflight, int sec),
>> +
>> +	TP_ARGS(pool, inflight, sec),
>> +
>> +	TP_STRUCT__entry(
>> +		__field(const struct page_pool *, pool)
>> +		__field(u32,			  id)
>> +		__field(int,			  inflight)
>> +		__field(int,			  sec)
>> +	),
>> +
>> +	TP_fast_assign(
>> +		__entry->pool		= pool;
>> +		__entry->id		= pool->user.id;
>> +		__entry->inflight	= inflight;
>> +		__entry->sec		= sec;
>> +	),
>> +
>> +	TP_printk("page_pool=%p id=%d inflight=%d sec=%d",
>> +		  __entry->pool, __entry->id, __entry->inflight, __entry->sec)
>> +);
>> +
>>  #endif /* _TRACE_PAGE_POOL_H */
> 
> From a tracing POV, I see nothing wrong with this.
> 
> Reviewed-by: Steven Rostedt (Google) <rostedt@...dmis.org>
> 
> -- Steve

Hi Steve,

Thanks for the review!

I realized the id should be printed with '%u', so I've sent out v3 [1]
with that adjustment.

Links:
[1]
https://lore.kernel.org/netdev/20260102071745.291969-1-leon.hwang@linux.dev/

Thanks,
Leon