Commit ee5f823a authored by mcaleavya's avatar mcaleavya

added new files for biosnoop and bashreadline

parent b2682f31
......@@ -9,35 +9,55 @@
# Licensed under the Apache License, Version 2.0 (the "License")
#
# 28-Jan-2016 Brendan Gregg Created this.
# 12-Feb-2016 Allan McAleavy migrated to BPF_PERF_OUTPUT
from __future__ import print_function
from bcc import BPF
from time import strftime
import ctypes as ct
# load BPF program
bpf_text = """
#include <uapi/linux/ptrace.h>
struct str_t {
u64 pid;
char str[80];
};
BPF_PERF_OUTPUT(events);
int printret(struct pt_regs *ctx) {
struct str_t data = {};
u32 pid;
if (!ctx->ax)
return 0;
char str[80] = {};
bpf_probe_read(&str, sizeof(str), (void *)ctx->ax);
bpf_trace_printk("%s\\n", &str);
pid = bpf_get_current_pid_tgid();
data.pid = pid;
bpf_probe_read(&data.str, sizeof(data.str), (void *)ctx->ax);
events.perf_submit(ctx,&data,sizeof(data));
return 0;
};
"""
STR_DATA = 80
class Data(ct.Structure):
_fields_ = [
("pid", ct.c_ulonglong),
("str", ct.c_char * STR_DATA)
]
b = BPF(text=bpf_text)
b.attach_uretprobe(name="/bin/bash", sym="readline", fn_name="printret")
# header
print("%-9s %-6s %s" % ("TIME", "PID", "COMMAND"))
# format output
def print_event(cpu, data, size):
event = ct.cast(data, ct.POINTER(Data)).contents
print("%-9s %-6d %s" % (strftime("%H:%M:%S"), event.pid, event.str))
b["events"].open_perf_buffer(print_event)
while 1:
try:
(task, pid, cpu, flags, ts, msg) = b.trace_fields()
except ValueError:
continue
print("%-9s %-6d %s" % (strftime("%H:%M:%S"), pid, msg))
b.kprobe_poll()
......@@ -11,9 +11,13 @@
# Licensed under the Apache License, Version 2.0 (the "License")
#
# 16-Sep-2015 Brendan Gregg Created this.
# 11-Feb-2016 Allan McAleavy updated for BPF_PERF_OUTPUT
from __future__ import print_function
from bcc import BPF
import ctypes as ct
import re
# load BPF program
b = BPF(text="""
......@@ -25,8 +29,21 @@ struct val_t {
char name[TASK_COMM_LEN];
};
struct key_t {
u32 pid;
u64 rwflag;
u64 delta;
u64 sector;
u64 len;
u64 ts;
char disk_name[DISK_NAME_LEN];
char name[TASK_COMM_LEN];
};
BPF_HASH(start, struct request *);
BPF_HASH(infobyreq, struct request *, struct val_t);
BPF_PERF_OUTPUT(events);
// cache PID and comm by-req
int trace_pid_start(struct pt_regs *ctx, struct request *req)
......@@ -37,7 +54,6 @@ int trace_pid_start(struct pt_regs *ctx, struct request *req)
val.pid = bpf_get_current_pid_tgid();
infobyreq.update(&req, &val);
}
return 0;
}
......@@ -58,6 +74,8 @@ int trace_req_completion(struct pt_regs *ctx, struct request *req)
u64 *tsp, delta;
u32 *pidp = 0;
struct val_t *valp;
struct key_t key ={};
u64 ts;
// fetch timestamp and calculate delta
tsp = start.lookup(&req);
......@@ -65,30 +83,29 @@ int trace_req_completion(struct pt_regs *ctx, struct request *req)
// missed tracing issue
return 0;
}
delta = bpf_ktime_get_ns() - *tsp;
ts = bpf_ktime_get_ns();
key.delta = ts - *tsp;
key.ts = ts / 1000;
//
// Fetch and output issuing pid and comm.
// As bpf_trace_prink() is limited to a maximum of 1 string and 2
// integers, we'll use more than one to output the data.
//
valp = infobyreq.lookup(&req);
if (valp == 0) {
bpf_trace_printk("0 0 ? %d\\n", req->__data_len);
key.len = req->__data_len;
strcpy(key.name,"?");
} else {
bpf_trace_printk("0 %d %s %d\\n", valp->pid, valp->name,
req->__data_len);
key.pid = valp->pid;
key.len = req->__data_len;
key.sector = req->__sector;
bpf_probe_read(&key.name, sizeof(key.name), valp->name);
bpf_probe_read(&key.disk_name, sizeof(key.disk_name),
req->rq_disk->disk_name);
}
// output remaining details
if (req->cmd_flags & REQ_WRITE) {
bpf_trace_printk("1 W %s %d %d ?\\n", req->rq_disk->disk_name,
req->__sector, delta / 1000);
key.rwflag=1;
} else {
bpf_trace_printk("1 R %s %d %d ?\\n", req->rq_disk->disk_name,
req->__sector, delta / 1000);
key.rwflag=0;
}
events.perf_submit(ctx,&key,sizeof(key));
start.delete(&req);
infobyreq.delete(&req);
......@@ -101,29 +118,51 @@ b.attach_kprobe(event="blk_mq_start_request", fn_name="trace_req_start")
b.attach_kprobe(event="blk_account_io_completion",
fn_name="trace_req_completion")
TASK_COMM_LEN = 16 # linux/sched.h
DISK_NAME_LEN = 32 # linux/genhd.h
class Data(ct.Structure):
_fields_ = [
("pid", ct.c_ulonglong),
("rwflag", ct.c_ulonglong),
("delta", ct.c_ulonglong),
("sector", ct.c_ulonglong),
("len", ct.c_ulonglong),
("ts", ct.c_ulonglong),
("disk_name", ct.c_char * DISK_NAME_LEN),
("name", ct.c_char * TASK_COMM_LEN)
]
# header
print("%-14s %-14s %-6s %-7s %-2s %-9s %-7s %7s" % ("TIME(s)", "COMM", "PID",
"DISK", "T", "SECTOR", "BYTES", "LAT(ms)"))
rwflg = ""
start_ts = 0
# format output
while 1:
(task, pid, cpu, flags, ts, msg) = b.trace_fields()
args = msg.split(" ")
prev_ts = 0
delta = 0
# process event
def print_event(cpu, data, size):
event = ct.cast(data, ct.POINTER(Data)).contents
val = -1
global start_ts
global prev_ts
global delta
if event.rwflag == 1:
rwflg = "W"
if event.rwflag == 0:
rwflg = "R"
if not re.match('\?', event.name):
val = event.sector
if start_ts == 0:
start_ts = ts
if args[0] == "0":
(real_pid, real_comm, bytes_s) = (args[1], args[2], args[3])
continue
else:
(type_s, disk_s, sector_s, us_s) = (args[1], args[2], args[3],
args[4])
ms = float(int(us_s, 10)) / 1000
prev_ts = start_ts
if start_ts == 1:
delta = float(delta) + (event.ts - prev_ts)
print("%-14.9f %-14.14s %-6s %-7s %-2s %-9s %-7s %7.2f" % (
ts - start_ts, real_comm, real_pid, disk_s, type_s, sector_s,
bytes_s, ms))
delta / 1000000, event.name, event.pid, event.disk_name, rwflg, val,
event.len, float(event.delta) / 1000000))
prev_ts = event.ts
start_ts = 1
b["events"].open_perf_buffer(print_event)
while 1:
b.kprobe_poll()
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