@@ -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 */
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: Jesper Dangaard Brouer <brouer@redhat.com> --- include/trace/events/page_pool.h | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-)