libbpf-tools: biopatter, bitesize and exitsnoop

These tools will require upstream libbpf patch:

https://lore.kernel.org/bpf/20220523212808.603526-1-connoro@google.com/T/#u

That upstream patch will be merged seperately; however,
we can build these tools independantly for now for debugging purposes.

$:/data/bcc # ./bitesize 1

Process Name = dd
     Kbytes              : count    distribution
         0 -> 1          : 0        |                                        |
         2 -> 3          : 0        |                                        |
         4 -> 7          : 1        |*                                       |
         8 -> 15         : 0        |                                        |
        16 -> 31         : 1        |*                                       |
        32 -> 63         : 1        |*                                       |
        64 -> 127        : 1        |*                                       |
       128 -> 255        : 1        |*                                       |
       256 -> 511        : 2        |**                                      |
       512 -> 1023       : 37       |****************************************|

$:/data/bcc # ./exitsnoop -t
TIME(s)  PCOMM            PID     PPID    TID     AGE(s)  EXIT_CODE
13:08:03 dd               16338   16299   16338   0.43    0
13:08:04 kworker/dying    30194   2       30194   7110.01 0
13:08:05 kworker/dying    30172   2       30172   7112.14 0

$:/data/bcc # ./biopattern 1
Tracing block device I/O requested seeks... Hit Ctrl-C to end.
DISK     %RND  %SEQ    COUNT     KBYTES
sda        75    25        4        144
sda       100     0        3         12
sda         0   100        6         24
sda       100     0       31        324
sda        83    16       24       2244

Bug: 296512575
Test: On Pixel running 5.10 kernel
Change-Id: I99884884a8bbb221fb2e039ad98b84cceec307cd
Signed-off-by: Akilesh Kailash <akailash@google.com>

1 files changed, 71 insertions, 0 deletions

diff --git a/libbpf-tools/Android.bp b/libbpf-tools/Android.bp
index edac3816..ec860e81 100644
--- a/libbpf-tools/Android.bp
+++ b/libbpf-tools/Android.bp
@@ -630,3 +630,74 @@ cc_binary {
     generated_headers:  ["biosnoop.skel.h"],
     defaults: ["bcc_binary_defaults"],
 }
+
+// The following tools viz. exitsnoop, biopattern and bitesize
+// will not work on Android without this libbpf patch:
+//
+// https://lore.kernel.org/bpf/20220523212808.603526-1-connoro@google.com/T/#u
+//
+// The patch is trivial but important as it looks for tracepoints under /sys/kernel/tracing
+// as there is no debugfs on Android.
+//
+// Additionally, any new tools which depend on kernel static tracepoints should
+// have this libbpf patch.
+
+cc_object {
+    name: "exitsnoop.bpf.o",
+    srcs: ["exitsnoop.bpf.c"],
+    defaults: ["bcc_bpf_defaults"],
+}
+
+genrule {
+    name: "exitsnoop.skel.h",
+    srcs: [":exitsnoop.bpf.o"],
+    out: ["exitsnoop.skel.h"],
+    defaults: ["bpf_skeleton_hdr_defaults"],
+}
+
+cc_binary {
+    name: "exitsnoop",
+    srcs: ["exitsnoop.c"],
+    generated_headers:  ["exitsnoop.skel.h"],
+    defaults: ["bcc_binary_defaults"],
+}
+
+cc_object {
+    name: "biopattern.bpf.o",
+    srcs: ["biopattern.bpf.c"],
+    defaults: ["bcc_bpf_defaults"],
+}
+
+genrule {
+    name: "biopattern.skel.h",
+    srcs: [":biopattern.bpf.o"],
+    out: ["biopattern.skel.h"],
+    defaults: ["bpf_skeleton_hdr_defaults"],
+}
+
+cc_binary {
+    name: "biopattern",
+    srcs: ["biopattern.c"],
+    generated_headers:  ["biopattern.skel.h"],
+    defaults: ["bcc_binary_defaults"],
+}
+
+cc_object {
+    name: "bitesize.bpf.o",
+    srcs: ["bitesize.bpf.c"],
+    defaults: ["bcc_bpf_defaults"],
+}
+
+genrule {
+    name: "bitesize.skel.h",
+    srcs: [":bitesize.bpf.o"],
+    out: ["bitesize.skel.h"],
+    defaults: ["bpf_skeleton_hdr_defaults"],
+}
+
+cc_binary {
+    name: "bitesize",
+    srcs: ["bitesize.c"],
+    generated_headers:  ["bitesize.skel.h"],
+    defaults: ["bcc_binary_defaults"],
+}