From: Jiri Olsa <jolsa@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>
Cc: netdev@vger.kernel.org, bpf@vger.kernel.org,
"Andrii Nakryiko" <andriin@fb.com>, "Yonghong Song" <yhs@fb.com>,
"Song Liu" <songliubraving@fb.com>,
"Martin KaFai Lau" <kafai@fb.com>,
"Jakub Kicinski" <kuba@kernel.org>,
"David Miller" <davem@redhat.com>,
"Björn Töpel" <bjorn.topel@intel.com>,
"John Fastabend" <john.fastabend@gmail.com>,
"Jesper Dangaard Brouer" <hawk@kernel.org>
Subject: [PATCH 14/14] bpf: Sort bpf kallsyms symbols
Date: Sat, 8 Feb 2020 16:42:09 +0100 [thread overview]
Message-ID: <20200208154209.1797988-15-jolsa@kernel.org> (raw)
In-Reply-To: <20200208154209.1797988-1-jolsa@kernel.org>
Currently we don't sort bpf_kallsyms and display symbols
in proc/kallsyms as they come in via __bpf_ksym_add.
Using the latch tree to get the next bpf_ksym object
and insert the new symbol ahead of it.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
kernel/bpf/core.c | 23 ++++++++++++++++++++++-
1 file changed, 22 insertions(+), 1 deletion(-)
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 50af5dcf7ff9..c63ff34b2128 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -651,9 +651,30 @@ static struct latch_tree_root bpf_progs_tree __cacheline_aligned;
static void __bpf_ksym_add(struct bpf_ksym *ksym)
{
+ struct list_head *head = &bpf_kallsyms;
+
WARN_ON_ONCE(!list_empty(&ksym->lnode));
- list_add_tail_rcu(&ksym->lnode, &bpf_kallsyms);
latch_tree_insert(&ksym->tnode, &bpf_kallsyms_tree, &bpf_kallsyms_tree_ops);
+
+ /*
+ * Add ksym into bpf_kallsyms in ordered position,
+ * which is prepared for us by latch tree addition.
+ *
+ * Find out the next symbol and insert ksym right
+ * ahead of it. If ksym is the last one, just tail
+ * add to the bpf_kallsyms.
+ */
+ if (!list_empty(&bpf_kallsyms)) {
+ struct rb_node *next = rb_next(&ksym->tnode.node[0]);
+
+ if (next) {
+ struct bpf_ksym *ptr;
+
+ ptr = container_of(next, struct bpf_ksym, tnode.node[0]);
+ head = &ptr->lnode;
+ }
+ }
+ list_add_tail_rcu(&ksym->lnode, head);
}
void bpf_ksym_add(struct bpf_ksym *ksym)
--
2.24.1
next prev parent reply other threads:[~2020-02-08 15:43 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-08 15:41 [PATCH 00/14] bpf: Add trampoline and dispatcher to /proc/kallsyms Jiri Olsa
2020-02-08 15:41 ` [PATCH 01/14] x86/mm: Rename is_kernel_text to __is_kernel_text Jiri Olsa
2020-02-08 15:41 ` [PATCH 02/14] bpf: Add bpf_trampoline_ name prefix for DECLARE_BPF_DISPATCHER Jiri Olsa
2020-02-08 15:41 ` [PATCH 03/14] bpf: Add struct bpf_ksym Jiri Olsa
2020-02-08 15:41 ` [PATCH 04/14] bpf: Add name to " Jiri Olsa
2020-02-08 15:42 ` [PATCH 05/14] bpf: Add lnode list node " Jiri Olsa
2020-02-08 15:42 ` [PATCH 06/14] bpf: Add bpf_kallsyms_tree tree Jiri Olsa
2020-02-11 18:21 ` Andrii Nakryiko
2020-02-12 10:49 ` Jiri Olsa
2020-02-08 15:42 ` [PATCH 07/14] bpf: Move bpf_tree add/del from bpf_prog_ksym_node_add/del Jiri Olsa
2020-02-08 15:42 ` [PATCH 08/14] bpf: Separate kallsyms add/del functions Jiri Olsa
2020-02-08 15:42 ` [PATCH 09/14] bpf: Add bpf_ksym_add/del functions Jiri Olsa
2020-02-08 15:42 ` [PATCH 10/14] bpf: Re-initialize lnode in bpf_ksym_del Jiri Olsa
2020-02-11 18:28 ` Andrii Nakryiko
2020-02-12 10:43 ` Jiri Olsa
2020-02-08 15:42 ` [PATCH 11/14] bpf: Rename bpf_tree to bpf_progs_tree Jiri Olsa
2020-02-08 15:42 ` [PATCH 12/14] bpf: Add trampolines to kallsyms Jiri Olsa
2020-02-11 18:51 ` Andrii Nakryiko
2020-02-12 11:10 ` Jiri Olsa
2020-02-12 16:33 ` Andrii Nakryiko
2020-02-12 22:58 ` Jiri Olsa
2020-02-12 23:02 ` Jiri Olsa
2020-02-08 15:42 ` [PATCH 13/14] bpf: Add dispatchers " Jiri Olsa
2020-02-11 19:03 ` Andrii Nakryiko
2020-02-12 10:52 ` Jiri Olsa
2020-02-08 15:42 ` Jiri Olsa [this message]
2020-02-11 19:12 ` [PATCH 14/14] bpf: Sort bpf kallsyms symbols Andrii Nakryiko
2020-02-10 15:51 ` [PATCH 00/14] bpf: Add trampoline and dispatcher to /proc/kallsyms Björn Töpel
2020-02-10 16:17 ` Jiri Olsa
2020-02-11 19:32 ` Arnaldo Carvalho de Melo
2020-02-12 11:13 ` Jiri Olsa
2020-02-12 13:31 ` Arnaldo Carvalho de Melo
2020-02-12 22:40 ` Jiri Olsa
2020-02-13 16:23 ` Jiri Olsa
2020-02-11 19:13 ` Arnaldo Carvalho de Melo
2020-02-12 10:46 ` Jiri Olsa
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