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page_pool: add tracepoints for page_pool with details need by XDP

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The xdp tracepoints for mem id disconnect don't carry information about, why
it was not safe_to_remove.  The tracepoint page_pool:page_pool_inflight in
this patch can be used for extract this info for further debugging.

This patchset also adds tracepoint for the pages_state_* release/hold
transitions, including a pointer to the page.  This can be used for stats
about in-flight pages, or used to debug page leakage via keeping track of
page pointer and combining this with kprobe for __put_page().

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Dangaard Brouer
2019-06-18 15:06:03 +02:00
committed by David S. Miller
parent f033b688c1
commit 32c28f7e41
3 changed files with 99 additions and 1 deletions
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87
include/trace/events/page_pool.h Normal file
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@@ -0,0 +1,87 @@
/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM page_pool
#if !defined(_TRACE_PAGE_POOL_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_PAGE_POOL_H
#include <linux/types.h>
#include <linux/tracepoint.h>
#include <net/page_pool.h>
TRACE_EVENT(page_pool_inflight,
TP_PROTO(const struct page_pool *pool,
s32 inflight, u32 hold, u32 release),
TP_ARGS(pool, inflight, hold, release),
TP_STRUCT__entry(
__field(const struct page_pool *, pool)
__field(s32, inflight)
__field(u32, hold)
__field(u32, release)
),
TP_fast_assign(
__entry->pool = pool;
__entry->inflight = inflight;
__entry->hold = hold;
__entry->release = release;
),
TP_printk("page_pool=%p inflight=%d hold=%u release=%u",
__entry->pool, __entry->inflight, __entry->hold, __entry->release)
);
TRACE_EVENT(page_pool_state_release,
TP_PROTO(const struct page_pool *pool,
const struct page *page, u32 release),
TP_ARGS(pool, page, release),
TP_STRUCT__entry(
__field(const struct page_pool *, pool)
__field(const struct page *, page)
__field(u32, release)
),
TP_fast_assign(
__entry->pool = pool;
__entry->page = page;
__entry->release = release;
),
TP_printk("page_pool=%p page=%p release=%u",
__entry->pool, __entry->page, __entry->release)
);
TRACE_EVENT(page_pool_state_hold,
TP_PROTO(const struct page_pool *pool,
const struct page *page, u32 hold),
TP_ARGS(pool, page, hold),
TP_STRUCT__entry(
__field(const struct page_pool *, pool)
__field(const struct page *, page)
__field(u32, hold)
),
TP_fast_assign(
__entry->pool = pool;
__entry->page = page;
__entry->hold = hold;
),
TP_printk("page_pool=%p page=%p hold=%u",
__entry->pool, __entry->page, __entry->hold)
);
#endif /* _TRACE_PAGE_POOL_H */
/* This part must be outside protection */
#include <trace/define_trace.h>