Commit 832ccf6f authored by Jesper Dangaard Brouer's avatar Jesper Dangaard Brouer Committed by David S. Miller
Browse files

page_pool: extend tracepoint to also include the page PFN 



The MM tracepoint for page free (called kmem:mm_page_free) doesn't provide
the page pointer directly, instead it provides the PFN (Page Frame Number).
This is annoying when writing a page_pool leak detector in BPF.

This patch change page_pool tracepoints to also provide the PFN.
The page pointer is still provided to allow other kinds of
troubleshooting from BPF.

Signed-off-by: default avatarJesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7c9e6942

include/trace/events/page_pool.h

+9 −4
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
#include <linux/types.h>

#include <linux/tracepoint.h>



#include <trace/events/mmflags.h>

#include <net/page_pool.h>



TRACE_EVENT(page_pool_release,
@@ -49,16 +50,18 @@ TRACE_EVENT(page_pool_state_release, 
		__field(const struct page_pool *,	pool)

		__field(const struct page *,		page)

		__field(u32,				release)

		__field(unsigned long,			pfn)

	),



	TP_fast_assign(

		__entry->pool		= pool;

		__entry->page		= page;

		__entry->release	= release;

		__entry->pfn		= page_to_pfn(page);

	),



	TP_printk("page_pool=%p page=%p release=%u",

		  __entry->pool, __entry->page, __entry->release)

	TP_printk("page_pool=%p page=%p pfn=%lu release=%u",

		  __entry->pool, __entry->page, __entry->pfn, __entry->release)

);



TRACE_EVENT(page_pool_state_hold,
@@ -72,16 +75,18 @@ TRACE_EVENT(page_pool_state_hold, 
		__field(const struct page_pool *,	pool)

		__field(const struct page *,		page)

		__field(u32,				hold)

		__field(unsigned long,			pfn)

	),



	TP_fast_assign(

		__entry->pool	= pool;

		__entry->page	= page;

		__entry->hold	= hold;

		__entry->pfn	= page_to_pfn(page);

	),



	TP_printk("page_pool=%p page=%p hold=%u",

		  __entry->pool, __entry->page, __entry->hold)

	TP_printk("page_pool=%p page=%p pfn=%lu hold=%u",

		  __entry->pool, __entry->page, __entry->pfn, __entry->hold)

);



#endif /* _TRACE_PAGE_POOL_H */

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