diff options
| author | Steven Rostedt (Red Hat) <srostedt@redhat.com> | 2013-03-06 03:23:55 +0100 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2013-03-15 05:35:49 +0100 |
| commit | ce9bae55972b228cf7bac34350c4d2caf8ea0d0b (patch) | |
| tree | 637ef0eb957989c40ae4749c090764cff640014d /kernel/trace/trace.c | |
| parent | tracing: Consolidate buffer allocation code (diff) | |
| download | linux-ce9bae55972b228cf7bac34350c4d2caf8ea0d0b.tar.xz linux-ce9bae55972b228cf7bac34350c4d2caf8ea0d0b.zip | |
tracing: Add snapshot feature to instances
Add the "snapshot" file to the the multi-buffer instances.
cd /sys/kernel/debug/tracing/instances
mkdir foo
ls foo
buffer_size_kb buffer_total_size_kb events free_buffer set_event
snapshot trace trace_clock trace_marker trace_options trace_pipe
tracing_on
cat foo/snapshot
# tracer: nop
#
#
# * Snapshot is freed *
#
# Snapshot commands:
# echo 0 > snapshot : Clears and frees snapshot buffer
# echo 1 > snapshot : Allocates snapshot buffer, if not already allocated.
# Takes a snapshot of the main buffer.
# echo 2 > snapshot : Clears snapshot buffer (but does not allocate)
# (Doesn't have to be '2' works with any number that
# is not a '0' or '1')
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to '')
| -rw-r--r-- | kernel/trace/trace.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 57895d476509..17671bc9a4b1 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -4302,9 +4302,9 @@ tracing_snapshot_write(struct file *filp, const char __user *ubuf, size_t cnt, local_irq_disable(); /* Now, we're going to swap */ if (iter->cpu_file == RING_BUFFER_ALL_CPUS) - update_max_tr(&global_trace, current, smp_processor_id()); + update_max_tr(tr, current, smp_processor_id()); else - update_max_tr_single(&global_trace, current, iter->cpu_file); + update_max_tr_single(tr, current, iter->cpu_file); local_irq_enable(); break; default: @@ -5533,6 +5533,11 @@ init_tracer_debugfs(struct trace_array *tr, struct dentry *d_tracer) trace_create_file("tracing_on", 0644, d_tracer, tr, &rb_simple_fops); + +#ifdef CONFIG_TRACER_SNAPSHOT + trace_create_file("snapshot", 0644, d_tracer, + (void *)&tr->trace_cpu, &snapshot_fops); +#endif } static __init int tracer_init_debugfs(void) @@ -5574,11 +5579,6 @@ static __init int tracer_init_debugfs(void) &ftrace_update_tot_cnt, &tracing_dyn_info_fops); #endif -#ifdef CONFIG_TRACER_SNAPSHOT - trace_create_file("snapshot", 0644, d_tracer, - (void *)&global_trace.trace_cpu, &snapshot_fops); -#endif - create_trace_instances(d_tracer); create_trace_options_dir(&global_trace); |