linux-kernel - [PATCH RFC 2/5] bpf: Use file object build id in stackmap

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Message-Id: <20230201135737.800527-3-jolsa@kernel.org>
Date:   Wed,  1 Feb 2023 14:57:34 +0100
From:   Jiri Olsa <jolsa@...nel.org>
To:     Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Hao Luo <haoluo@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     bpf@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH RFC 2/5] bpf: Use file object build id in stackmap

Use build id from file object in stackmap if it's available.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 kernel/bpf/stackmap.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index aecea7451b61..944cb260a42c 100644
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -156,7 +156,15 @@ static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs,
 			goto build_id_valid;
 		}
 		vma = find_vma(current->mm, ips[i]);
+#ifdef CONFIG_FILE_BUILD_ID
+		if (vma && vma->vm_file && vma->vm_file->f_bid) {
+			memcpy(id_offs[i].build_id,
+			       vma->vm_file->f_bid->data,
+			       vma->vm_file->f_bid->sz);
+		} else {
+#else
 		if (!vma || build_id_parse(vma, id_offs[i].build_id, NULL)) {
+#endif
 			/* per entry fall back to ips */
 			id_offs[i].status = BPF_STACK_BUILD_ID_IP;
 			id_offs[i].ip = ips[i];
-- 
2.39.1