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Date: Thu, 17 Jun 2021 11:59:21 +0900
From: Masami Hiramatsu <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Ingo Molnar <mingo@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
John 'Warthog9' Hawley <warthog9@...nel.org>
Subject: Re: [RFC][PATCH] bootconfig/tracing/ktest: Add ktest examples of
testing bootconfig
Hi Steve,
On Wed, 16 Jun 2021 17:41:55 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:
> From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
>
> bootconfig is a new feature that appends scripts onto the initrd, and the
> kernel executes the scripts as an extended kernel command line.
>
> Need to add tests to test that the happened. To test the bootconfig
> properly, the initrd needs to be updated and the kernel rebooted. ktest is
> the perfect solution to perform these tests.
>
> Add a example bootconfig.conf in the tools/testing/ktest/examples/include
> and example bootconfig scripts in tools/testing/ktest/examples/bootconfig
> and also include verifier scripts that ktest will install on the target
> and run to make sure that the bootconfig options in the scripts took place
> after the target rebooted with the new initrd update.
Thank you very much for integrate it to ktest!
I gave some experimental bconfs without cleanup.
[..]
> diff --git a/tools/testing/ktest/examples/bootconfigs/config-bootconfig b/tools/testing/ktest/examples/bootconfigs/config-bootconfig
> new file mode 100644
> index 000000000000..0685b6811388
> --- /dev/null
> +++ b/tools/testing/ktest/examples/bootconfigs/config-bootconfig
> @@ -0,0 +1 @@
> +CONFIG_CMDLINE="bootconfig"
> diff --git a/tools/testing/ktest/examples/bootconfigs/ftrace.bconf b/tools/testing/ktest/examples/bootconfigs/ftrace.bconf
> new file mode 100644
> index 000000000000..30ab0d5e636f
> --- /dev/null
> +++ b/tools/testing/ktest/examples/bootconfigs/ftrace.bconf
> @@ -0,0 +1,82 @@
> +#!/bin/sh
This shebang is for the syntax hilighting. Please remove it.
> +
> +ftrace {
> + options = "sym-addr", "context-info"
> + buffer_size = 1MB
> +}
> +
> +ftrace.event {
> + # Sample1: Make a histogram for initcall functions
> + synthetic.initcall_latency {
> + fields = "unsigned long func", "u64 lat"
> + hist {
> + keys = func.sym, lat
> + vals = lat
> + sort = lat
> + }
These event.<GROUP>.<EVENT>.hist block is an experimental syntax (plan A),
and not implemented yet.
> + }
> + initcall.initcall_start.hist {
> + keys = func
> + var.ts0 = common_timestamp.usecs
> + }
> + initcall.initcall_finish.hist {
> + keys = func
> + var.lat = common_timestamp.usecs - $ts0
> + onmatch {
> + event = initcall.initcall_start
> + action = "initcall_latency(func, $lat)"
> + }
> + }
So please drop this Sample1.
> +
> + # Sample2: kmalloc() tracing in read(2) syscall
> + syscalls.sys_enter_read.enable_event {
> + event = kmem.kmalloc
> + count = 1
> + }
> + syscalls.sys_exit_read.disable_event {
> + event = kmem.kmalloc
> + }
> +
> + # Sample3: Stacktrace at the event
> + kmem.kmalloc.stacktrace {
> + count = 5
> + filter = 'bytes_req >= 65536'
> + }
> +
> + # Sample4: Take a snapshot
> + block.block_unplug.snapshot {
> + count = 1
> + filter = nr_rq > 1
> + }
> +
> + # Sample5: Trace-on/off
> + block.block_plug.traceon {
> + filter = nr_rq > 1
> + }
> + block.block_unplug.traceoff {
> + filter = nr_rq > 1
> + }
> +
> + # Sample6: onmax
> + sched.sched_waking {
> + enable
> + hist {
> + keys = pid
> + ts1 = common_timestamp.usecs
> + filter = 'comm == "cyclictest"'
> + }
> + }
> + sched.sched_switch {
> + enable
> + hist {
> + keys = next_pid
> + var.wakeup_lat = common_timestamp.usecs - $ts1
> + onmax {
> + var = wakeup_lat
> + action = "save(next_prio,next_comm,prev_pid,prev_prio,prev_comm)"
> + }
> + filter = 'next_comm == "cyclictest"'
> + }
This also an experimental syntax. Please drop Sample 6.
> + }
> +}
> +
> diff --git a/tools/testing/ktest/examples/bootconfigs/functiongraph.bconf b/tools/testing/ktest/examples/bootconfigs/functiongraph.bconf
> new file mode 100644
> index 000000000000..f9fb65caaad2
> --- /dev/null
> +++ b/tools/testing/ktest/examples/bootconfigs/functiongraph.bconf
> @@ -0,0 +1,15 @@
> +ftrace {
> + tracing_on = 0 # off by default
> + tracer = function_graph
> + event.kprobes {
> + start_event {
> + probes = "pci_proc_init"
> + actions = "traceon"
> + }
> + end_event {
> + probes = "pci_proc_init%return"
> + actions = "traceoff"
> + }
> + }
> + }
> +
> diff --git a/tools/testing/ktest/examples/bootconfigs/tracing.bconf b/tools/testing/ktest/examples/bootconfigs/tracing.bconf
> new file mode 100644
> index 000000000000..4094390ade41
> --- /dev/null
> +++ b/tools/testing/ktest/examples/bootconfigs/tracing.bconf
> @@ -0,0 +1,51 @@
> +ftrace {
> + tracer = function;
> + options = event-fork, sym-addr, stacktrace;
> + buffer_size = 1M;
> + alloc_snapshot;
> + trace_clock = global;
> + events = "task:task_newtask", "initcall:*";
> + event.sched.sched_process_exec {
> + filter = "pid < 128";
> + }
> + event.kprobes.myevent {
> + probes = "vfs_read $arg1 $arg2", "vfs_write $arg1 $arg2"
> + }
> + event.kprobes.myevent2 {
> + probes = "initrd_load";
> + }
> + event.kprobes.enable
> + instance.bar {
> + event.synthetic.initcall_latency {
> + fields = "unsigned long func", "u64 lat";
> + actions.hist {
> + keys = func.sym, lat;
> + vals = lat;
> + sort = lat;
> + }
This is another experimental syntax (plan B).
This makes histogram into actions.
> + }
> + event.initcall {
> + initcall_start.actions.hist {
> + keys = func;
> + ts0 = "common_timestamp.usecs";
But remove "var." from local variable definition.
> + }
> + initcall_finish.actions.hist {
> + keys = "func";
> + lat = "common_timestamp.usecs-$ts0";
> + onmatch = "initcall.initcall_start",
> + "initcall_latency(func,$lat)";
> + }
> + }
> + }
Thus, please drop this "instance.bar" block.
> + instance.foo {
> + tracer = function-graph;
> + tracing_on = false;
> + event.workqueue.workqueue_start.actions = "tracing_on";
> + event.workqueue.workqueue_end.actions = "tracing_off";
> + };
> +}
> +kernel {
> + tp_printk;
> + dump_on_oops = 2
> + traceoff_on_warning
> +}
Thank you,
--
Masami Hiramatsu <mhiramat@...nel.org>
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