diff options
| author | Jesper Dangaard Brouer <brouer@redhat.com> | 2019-06-18 15:06:03 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-06-19 11:23:13 -0400 |
| commit | 32c28f7e413981c7dd4a3ad9bbb1151e4b654261 (patch) | |
| tree | 3231f0c5e391c8a08e583697f6cc7715d1b970dc /net/core/page_pool.c | |
| parent | f033b688c1ede5ec78c9a718fa9f0b374049bc31 (diff) | |
page_pool: add tracepoints for page_pool with details need by XDP
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>
Diffstat (limited to 'net/core/page_pool.c')
| -rw-r--r-- | net/core/page_pool.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/net/core/page_pool.c b/net/core/page_pool.c index 42c3b0a5a259..f55ab055d543 100644 --- a/net/core/page_pool.c +++ b/net/core/page_pool.c @@ -4,6 +4,7 @@ * Author: Jesper Dangaard Brouer <netoptimizer@brouer.com> * Copyright (C) 2016 Red Hat, Inc. */ + #include <linux/types.h> #include <linux/kernel.h> #include <linux/slab.h> @@ -14,6 +15,8 @@ #include <linux/page-flags.h> #include <linux/mm.h> /* for __put_page() */ +#include <trace/events/page_pool.h> + static int page_pool_init(struct page_pool *pool, const struct page_pool_params *params) { @@ -156,6 +159,8 @@ skip_dma_map: /* Track how many pages are held 'in-flight' */ pool->pages_state_hold_cnt++; + trace_page_pool_state_hold(pool, page, pool->pages_state_hold_cnt); + /* When page just alloc'ed is should/must have refcnt 1. */ return page; } @@ -191,7 +196,7 @@ static s32 page_pool_inflight(struct page_pool *pool) distance = _distance(hold_cnt, release_cnt); - /* TODO: Add tracepoint here */ + trace_page_pool_inflight(pool, distance, hold_cnt, release_cnt); return distance; } @@ -222,6 +227,8 @@ static void __page_pool_clean_page(struct page_pool *pool, page->dma_addr = 0; skip_dma_unmap: atomic_inc(&pool->pages_state_release_cnt); + trace_page_pool_state_release(pool, page, + atomic_read(&pool->pages_state_release_cnt)); } /* unmap the page and clean our state */ |