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bcc/SOURCES/bcc-0.28.0-libbpf-tools-add-block_io_-start-done-tracepoints-su.patch

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From 60860bf3a400dcf72b4026fb2973803cfb12ccf1 Mon Sep 17 00:00:00 2001
From: mickey_zhu <mickey_zhu@realsil.com.cn>
Date: Tue, 27 Jun 2023 16:32:44 +0800
Subject: [PATCH] libbpf-tools: add block_io_{start,done} tracepoints support
to bio tools
Some bio tools fail to kprobe blk_account_io_{start,done} after v5.17,
because they become inlined, see [0]. To fix this issue, tracepoints
blick_io_{start,done} are introcuded in kernel, see[1].
Update related bio tools to support new tracepoints, and also simplify
attach.
[0] Kernel commit 450b7879e345 (block: move blk_account_io_{start,done} to blk-mq.c)
[1] Kernel commit 5a80bd075f3b (block: introduce block_io_start/block_io_done tracepoints)
Change-Id: I62b957abd7ce2901eb114bd57c78938e4f083e4d
Signed-off-by: Mickey Zhu <mickey_zhu@realsil.com.cn>
---
libbpf-tools/biosnoop.bpf.c | 9 ++++
libbpf-tools/biosnoop.c | 78 +++++++++++++--------------------
libbpf-tools/biostacks.bpf.c | 46 +++++++++++++------
libbpf-tools/biostacks.c | 85 +++++++++++++++++++++---------------
libbpf-tools/biotop.bpf.c | 44 +++++++++++++++++--
libbpf-tools/biotop.c | 59 ++++++++++++++++---------
6 files changed, 199 insertions(+), 122 deletions(-)
diff --git a/libbpf-tools/biosnoop.bpf.c b/libbpf-tools/biosnoop.bpf.c
index b791555f..fcc5c5ce 100644
--- a/libbpf-tools/biosnoop.bpf.c
+++ b/libbpf-tools/biosnoop.bpf.c
@@ -76,6 +76,15 @@ int BPF_PROG(blk_account_io_start, struct request *rq)
return trace_pid(rq);
}
+SEC("tp_btf/block_io_start")
+int BPF_PROG(block_io_start, struct request *rq)
+{
+ if (filter_cg && !bpf_current_task_under_cgroup(&cgroup_map, 0))
+ return 0;
+
+ return trace_pid(rq);
+}
+
SEC("kprobe/blk_account_io_merge_bio")
int BPF_KPROBE(blk_account_io_merge_bio, struct request *rq)
{
diff --git a/libbpf-tools/biosnoop.c b/libbpf-tools/biosnoop.c
index 21773729..f9468900 100644
--- a/libbpf-tools/biosnoop.c
+++ b/libbpf-tools/biosnoop.c
@@ -212,6 +212,16 @@ void handle_lost_events(void *ctx, int cpu, __u64 lost_cnt)
fprintf(stderr, "lost %llu events on CPU #%d\n", lost_cnt, cpu);
}
+static void blk_account_io_set_attach_target(struct biosnoop_bpf *obj)
+{
+ if (fentry_can_attach("blk_account_io_start", NULL))
+ bpf_program__set_attach_target(obj->progs.blk_account_io_start,
+ 0, "blk_account_io_start");
+ else
+ bpf_program__set_attach_target(obj->progs.blk_account_io_start,
+ 0, "__blk_account_io_start");
+}
+
int main(int argc, char **argv)
{
const struct partition *partition;
@@ -260,12 +270,23 @@ int main(int argc, char **argv)
obj->rodata->filter_cg = env.cg;
obj->rodata->min_ns = env.min_lat_ms * 1000000;
- if (fentry_can_attach("blk_account_io_start", NULL))
- bpf_program__set_attach_target(obj->progs.blk_account_io_start, 0,
- "blk_account_io_start");
- else
- bpf_program__set_attach_target(obj->progs.blk_account_io_start, 0,
- "__blk_account_io_start");
+ if (tracepoint_exists("block", "block_io_start"))
+ bpf_program__set_autoload(obj->progs.blk_account_io_start, false);
+ else {
+ bpf_program__set_autoload(obj->progs.block_io_start, false);
+ blk_account_io_set_attach_target(obj);
+ }
+
+ ksyms = ksyms__load();
+ if (!ksyms) {
+ fprintf(stderr, "failed to load kallsyms\n");
+ goto cleanup;
+ }
+ if (!ksyms__get_symbol(ksyms, "blk_account_io_merge_bio"))
+ bpf_program__set_autoload(obj->progs.blk_account_io_merge_bio, false);
+
+ if (!env.queued)
+ bpf_program__set_autoload(obj->progs.block_rq_insert, false);
err = biosnoop_bpf__load(obj);
if (err) {
@@ -288,48 +309,9 @@ int main(int argc, char **argv)
}
}
- obj->links.blk_account_io_start = bpf_program__attach(obj->progs.blk_account_io_start);
- if (!obj->links.blk_account_io_start) {
- err = -errno;
- fprintf(stderr, "failed to attach blk_account_io_start: %s\n",
- strerror(-err));
- goto cleanup;
- }
- ksyms = ksyms__load();
- if (!ksyms) {
- err = -ENOMEM;
- fprintf(stderr, "failed to load kallsyms\n");
- goto cleanup;
- }
- if (ksyms__get_symbol(ksyms, "blk_account_io_merge_bio")) {
- obj->links.blk_account_io_merge_bio =
- bpf_program__attach(obj->progs.blk_account_io_merge_bio);
- if (!obj->links.blk_account_io_merge_bio) {
- err = -errno;
- fprintf(stderr, "failed to attach blk_account_io_merge_bio: %s\n",
- strerror(-err));
- goto cleanup;
- }
- }
- if (env.queued) {
- obj->links.block_rq_insert =
- bpf_program__attach(obj->progs.block_rq_insert);
- if (!obj->links.block_rq_insert) {
- err = -errno;
- fprintf(stderr, "failed to attach block_rq_insert: %s\n", strerror(-err));
- goto cleanup;
- }
- }
- obj->links.block_rq_issue = bpf_program__attach(obj->progs.block_rq_issue);
- if (!obj->links.block_rq_issue) {
- err = -errno;
- fprintf(stderr, "failed to attach block_rq_issue: %s\n", strerror(-err));
- goto cleanup;
- }
- obj->links.block_rq_complete = bpf_program__attach(obj->progs.block_rq_complete);
- if (!obj->links.block_rq_complete) {
- err = -errno;
- fprintf(stderr, "failed to attach block_rq_complete: %s\n", strerror(-err));
+ err = biosnoop_bpf__attach(obj);
+ if (err) {
+ fprintf(stderr, "failed to attach BPF programs: %d\n", err);
goto cleanup;
}
diff --git a/libbpf-tools/biostacks.bpf.c b/libbpf-tools/biostacks.bpf.c
index c3950910..0ca69880 100644
--- a/libbpf-tools/biostacks.bpf.c
+++ b/libbpf-tools/biostacks.bpf.c
@@ -67,20 +67,8 @@ int trace_start(void *ctx, struct request *rq, bool merge_bio)
return 0;
}
-SEC("fentry/blk_account_io_start")
-int BPF_PROG(blk_account_io_start, struct request *rq)
-{
- return trace_start(ctx, rq, false);
-}
-
-SEC("kprobe/blk_account_io_merge_bio")
-int BPF_KPROBE(blk_account_io_merge_bio, struct request *rq)
-{
- return trace_start(ctx, rq, true);
-}
-
-SEC("fentry/blk_account_io_done")
-int BPF_PROG(blk_account_io_done, struct request *rq)
+static __always_inline
+int trace_done(void *ctx, struct request *rq)
{
u64 slot, ts = bpf_ktime_get_ns();
struct internal_rqinfo *i_rqinfop;
@@ -110,4 +98,34 @@ int BPF_PROG(blk_account_io_done, struct request *rq)
return 0;
}
+SEC("kprobe/blk_account_io_merge_bio")
+int BPF_KPROBE(blk_account_io_merge_bio, struct request *rq)
+{
+ return trace_start(ctx, rq, true);
+}
+
+SEC("fentry/blk_account_io_start")
+int BPF_PROG(blk_account_io_start, struct request *rq)
+{
+ return trace_start(ctx, rq, false);
+}
+
+SEC("fentry/blk_account_io_done")
+int BPF_PROG(blk_account_io_done, struct request *rq)
+{
+ return trace_done(ctx, rq);
+}
+
+SEC("tp_btf/block_io_start")
+int BPF_PROG(block_io_start, struct request *rq)
+{
+ return trace_start(ctx, rq, false);
+}
+
+SEC("tp_btf/block_io_done")
+int BPF_PROG(block_io_done, struct request *rq)
+{
+ return trace_done(ctx, rq);
+}
+
char LICENSE[] SEC("license") = "GPL";
diff --git a/libbpf-tools/biostacks.c b/libbpf-tools/biostacks.c
index e1878d1f..e7875f76 100644
--- a/libbpf-tools/biostacks.c
+++ b/libbpf-tools/biostacks.c
@@ -128,6 +128,39 @@ void print_map(struct ksyms *ksyms, struct partitions *partitions, int fd)
return;
}
+static bool has_block_io_tracepoints(void)
+{
+ return tracepoint_exists("block", "block_io_start") &&
+ tracepoint_exists("block", "block_io_done");
+}
+
+static void disable_block_io_tracepoints(struct biostacks_bpf *obj)
+{
+ bpf_program__set_autoload(obj->progs.block_io_start, false);
+ bpf_program__set_autoload(obj->progs.block_io_done, false);
+}
+
+static void disable_blk_account_io_fentry(struct biostacks_bpf *obj)
+{
+ bpf_program__set_autoload(obj->progs.blk_account_io_start, false);
+ bpf_program__set_autoload(obj->progs.blk_account_io_done, false);
+}
+
+static void blk_account_io_set_attach_target(struct biostacks_bpf *obj)
+{
+ if (fentry_can_attach("blk_account_io_start", NULL)) {
+ bpf_program__set_attach_target(obj->progs.blk_account_io_start,
+ 0, "blk_account_io_start");
+ bpf_program__set_attach_target(obj->progs.blk_account_io_done,
+ 0, "blk_account_io_done");
+ } else {
+ bpf_program__set_attach_target(obj->progs.blk_account_io_start,
+ 0, "__blk_account_io_start");
+ bpf_program__set_attach_target(obj->progs.blk_account_io_done,
+ 0, "__blk_account_io_done");
+ }
+}
+
int main(int argc, char **argv)
{
struct partitions *partitions = NULL;
@@ -172,50 +205,30 @@ int main(int argc, char **argv)
obj->rodata->targ_ms = env.milliseconds;
- if (fentry_can_attach("blk_account_io_start", NULL)) {
- bpf_program__set_attach_target(obj->progs.blk_account_io_start, 0,
- "blk_account_io_start");
- bpf_program__set_attach_target(obj->progs.blk_account_io_done, 0,
- "blk_account_io_done");
- } else {
- bpf_program__set_attach_target(obj->progs.blk_account_io_start, 0,
- "__blk_account_io_start");
- bpf_program__set_attach_target(obj->progs.blk_account_io_done, 0,
- "__blk_account_io_done");
- }
-
- err = biostacks_bpf__load(obj);
- if (err) {
- fprintf(stderr, "failed to load BPF object: %d\n", err);
- goto cleanup;
+ if (has_block_io_tracepoints())
+ disable_blk_account_io_fentry(obj);
+ else {
+ disable_block_io_tracepoints(obj);
+ blk_account_io_set_attach_target(obj);
}
- obj->links.blk_account_io_start = bpf_program__attach(obj->progs.blk_account_io_start);
- if (!obj->links.blk_account_io_start) {
- err = -errno;
- fprintf(stderr, "failed to attach blk_account_io_start: %s\n", strerror(-err));
- goto cleanup;
- }
ksyms = ksyms__load();
if (!ksyms) {
fprintf(stderr, "failed to load kallsyms\n");
goto cleanup;
}
- if (ksyms__get_symbol(ksyms, "blk_account_io_merge_bio")) {
- obj->links.blk_account_io_merge_bio =
- bpf_program__attach(obj->progs.blk_account_io_merge_bio);
- if (!obj->links.blk_account_io_merge_bio) {
- err = -errno;
- fprintf(stderr, "failed to attach blk_account_io_merge_bio: %s\n",
- strerror(-err));
- goto cleanup;
- }
+ if (!ksyms__get_symbol(ksyms, "blk_account_io_merge_bio"))
+ bpf_program__set_autoload(obj->progs.blk_account_io_merge_bio, false);
+
+ err = biostacks_bpf__load(obj);
+ if (err) {
+ fprintf(stderr, "failed to load BPF object: %d\n", err);
+ goto cleanup;
}
- obj->links.blk_account_io_done = bpf_program__attach(obj->progs.blk_account_io_done);
- if (!obj->links.blk_account_io_done) {
- err = -errno;
- fprintf(stderr, "failed to attach blk_account_io_done: %s\n",
- strerror(-err));
+
+ err = biostacks_bpf__attach(obj);
+ if (err) {
+ fprintf(stderr, "failed to attach BPF programs: %d\n", err);
goto cleanup;
}
diff --git a/libbpf-tools/biotop.bpf.c b/libbpf-tools/biotop.bpf.c
index 226e32d3..07631378 100644
--- a/libbpf-tools/biotop.bpf.c
+++ b/libbpf-tools/biotop.bpf.c
@@ -30,8 +30,8 @@ struct {
__type(value, struct val_t);
} counts SEC(".maps");
-SEC("kprobe")
-int BPF_KPROBE(blk_account_io_start, struct request *req)
+static __always_inline
+int trace_start(struct request *req)
{
struct who_t who = {};
@@ -56,8 +56,8 @@ int BPF_KPROBE(blk_mq_start_request, struct request *req)
return 0;
}
-SEC("kprobe")
-int BPF_KPROBE(blk_account_io_done, struct request *req, u64 now)
+static __always_inline
+int trace_done(struct request *req)
{
struct val_t *valp, zero = {};
struct info_t info = {};
@@ -103,4 +103,40 @@ int BPF_KPROBE(blk_account_io_done, struct request *req, u64 now)
return 0;
}
+SEC("kprobe/blk_account_io_start")
+int BPF_KPROBE(blk_account_io_start, struct request *req)
+{
+ return trace_start(req);
+}
+
+SEC("kprobe/blk_account_io_done")
+int BPF_KPROBE(blk_account_io_done, struct request *req)
+{
+ return trace_done(req);
+}
+
+SEC("kprobe/__blk_account_io_start")
+int BPF_KPROBE(__blk_account_io_start, struct request *req)
+{
+ return trace_start(req);
+}
+
+SEC("kprobe/__blk_account_io_done")
+int BPF_KPROBE(__blk_account_io_done, struct request *req)
+{
+ return trace_done(req);
+}
+
+SEC("tp_btf/block_io_start")
+int BPF_PROG(block_io_start, struct request *req)
+{
+ return trace_start(req);
+}
+
+SEC("tp_btf/block_io_done")
+int BPF_PROG(block_io_done, struct request *req)
+{
+ return trace_done(req);
+}
+
char LICENSE[] SEC("license") = "GPL";
diff --git a/libbpf-tools/biotop.c b/libbpf-tools/biotop.c
index 75484281..5b3a7cf3 100644
--- a/libbpf-tools/biotop.c
+++ b/libbpf-tools/biotop.c
@@ -354,6 +354,38 @@ static int print_stat(struct biotop_bpf *obj)
return err;
}
+static bool has_block_io_tracepoints(void)
+{
+ return tracepoint_exists("block", "block_io_start") &&
+ tracepoint_exists("block", "block_io_done");
+}
+
+static void disable_block_io_tracepoints(struct biotop_bpf *obj)
+{
+ bpf_program__set_autoload(obj->progs.block_io_start, false);
+ bpf_program__set_autoload(obj->progs.block_io_done, false);
+}
+
+static void disable_blk_account_io_kprobes(struct biotop_bpf *obj)
+{
+ bpf_program__set_autoload(obj->progs.blk_account_io_start, false);
+ bpf_program__set_autoload(obj->progs.blk_account_io_done, false);
+ bpf_program__set_autoload(obj->progs.__blk_account_io_start, false);
+ bpf_program__set_autoload(obj->progs.__blk_account_io_done, false);
+}
+
+static void blk_account_io_set_autoload(struct biotop_bpf *obj,
+ struct ksyms *ksyms)
+{
+ if (!ksyms__get_symbol(ksyms, "__blk_account_io_start")) {
+ bpf_program__set_autoload(obj->progs.__blk_account_io_start, false);
+ bpf_program__set_autoload(obj->progs.__blk_account_io_done, false);
+ } else {
+ bpf_program__set_autoload(obj->progs.blk_account_io_start, false);
+ bpf_program__set_autoload(obj->progs.blk_account_io_done, false);
+ }
+}
+
int main(int argc, char **argv)
{
static const struct argp argp = {
@@ -386,32 +418,19 @@ int main(int argc, char **argv)
goto cleanup;
}
+ if (has_block_io_tracepoints())
+ disable_blk_account_io_kprobes(obj);
+ else {
+ disable_block_io_tracepoints(obj);
+ blk_account_io_set_autoload(obj, ksyms);
+ }
+
err = biotop_bpf__load(obj);
if (err) {
warn("failed to load BPF object: %d\n", err);
goto cleanup;
}
- if (ksyms__get_symbol(ksyms, "__blk_account_io_start"))
- obj->links.blk_account_io_start = bpf_program__attach_kprobe(obj->progs.blk_account_io_start, false, "__blk_account_io_start");
- else
- obj->links.blk_account_io_start = bpf_program__attach_kprobe(obj->progs.blk_account_io_start, false, "blk_account_io_start");
-
- if (!obj->links.blk_account_io_start) {
- warn("failed to load attach blk_account_io_start\n");
- goto cleanup;
- }
-
- if (ksyms__get_symbol(ksyms, "__blk_account_io_done"))
- obj->links.blk_account_io_done = bpf_program__attach_kprobe(obj->progs.blk_account_io_done, false, "__blk_account_io_done");
- else
- obj->links.blk_account_io_done = bpf_program__attach_kprobe(obj->progs.blk_account_io_done, false, "blk_account_io_done");
-
- if (!obj->links.blk_account_io_done) {
- warn("failed to load attach blk_account_io_done\n");
- goto cleanup;
- }
-
err = biotop_bpf__attach(obj);
if (err) {
warn("failed to attach BPF programs: %d\n", err);
--
2.41.0
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