Re: [PATCH net-next v10 06/14] page_pool: convert to use netmem

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On 6/6/24 02:48, Steven Rostedt wrote:
On Thu, 30 May 2024 20:16:05 +0000
Mina Almasry <almasrymina@xxxxxxxxxx> wrote:

@@ -42,51 +42,52 @@ TRACE_EVENT(page_pool_release,
  TRACE_EVENT(page_pool_state_release,
TP_PROTO(const struct page_pool *pool,
-		 const struct page *page, u32 release),
+		 netmem_ref netmem, u32 release),
- TP_ARGS(pool, page, release),
+	TP_ARGS(pool, netmem, release),
TP_STRUCT__entry(
  		__field(const struct page_pool *,	pool)
-		__field(const struct page *,		page)
+		__field(netmem_ref,			netmem)

Why make this of type "netmem_ref" and not just "unsigned long"?

  		__field(u32,				release)
  		__field(unsigned long,			pfn)
  	),
TP_fast_assign(
  		__entry->pool		= pool;
-		__entry->page		= page;
+		__entry->netmem		= netmem;

You could have this be:

		__entry->netmem		= (__force unsigned long)netmem;

  		__entry->release	= release;
-		__entry->pfn		= page_to_pfn(page);
+		__entry->pfn		= netmem_to_pfn(netmem);
  	),
- TP_printk("page_pool=%p page=%p pfn=0x%lx release=%u",
-		  __entry->pool, __entry->page, __entry->pfn, __entry->release)
+	TP_printk("page_pool=%p netmem=%lu pfn=0x%lx release=%u",
+		  __entry->pool, (__force unsigned long)__entry->netmem,

And not have to expose the above text to user space (look at the format
file it produces).

It being of type "netmem_ref" in the ring buffer is useless.

netmem is a pointer with one bit serving as a flag, considering
mangling it might be better to %p it and perhaps also print its
type (page* vs iov) separately.

--
Pavel Begunkov



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