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: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/trace/events/page_pool.h b/include/trace/events/page_pool.h
index ee7f1aca7839b71c1a9017e61a5573feef1634b8..2f2a10e8eb56ff5a32a9a83d37e25cfa0a91f3e8 100644 (file)
--- a/include/trace/events/page_pool.h
+++ b/include/trace/events/page_pool.h
@@ -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 */