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tracing/ftrace: Enable snapshot function trigger to work with instances

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Modify the snapshot probe trigger to work with instances. This way the
snapshot function trigger will only affect the instance that it is added to
in the set_ftrace_filter file.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2017-04-20 11:34:06 -04:00
parent d2afd57a4b
commit cab5037950
1 changed files with 25 additions and 19 deletions
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44
kernel/trace/trace.c
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@ -894,23 +894,8 @@ int __trace_bputs(unsigned long ip, const char *str)
EXPORT_SYMBOL_GPL(__trace_bputs);
#ifdef CONFIG_TRACER_SNAPSHOT
/**
* trace_snapshot - take a snapshot of the current buffer.
*
* This causes a swap between the snapshot buffer and the current live
* tracing buffer. You can use this to take snapshots of the live
* trace when some condition is triggered, but continue to trace.
*
* Note, make sure to allocate the snapshot with either
* a tracing_snapshot_alloc(), or by doing it manually
* with: echo 1 > /sys/kernel/debug/tracing/snapshot
*
* If the snapshot buffer is not allocated, it will stop tracing.
* Basically making a permanent snapshot.
*/
void tracing_snapshot(void)
static void tracing_snapshot_instance(struct trace_array *tr)
{
struct trace_array *tr = &global_trace;
struct tracer *tracer = tr->current_trace;
unsigned long flags;
@ -938,6 +923,27 @@ void tracing_snapshot(void)
update_max_tr(tr, current, smp_processor_id());
local_irq_restore(flags);
}
/**
* trace_snapshot - take a snapshot of the current buffer.
*
* This causes a swap between the snapshot buffer and the current live
* tracing buffer. You can use this to take snapshots of the live
* trace when some condition is triggered, but continue to trace.
*
* Note, make sure to allocate the snapshot with either
* a tracing_snapshot_alloc(), or by doing it manually
* with: echo 1 > /sys/kernel/debug/tracing/snapshot
*
* If the snapshot buffer is not allocated, it will stop tracing.
* Basically making a permanent snapshot.
*/
void tracing_snapshot(void)
{
struct trace_array *tr = &global_trace;
tracing_snapshot_instance(tr);
}
EXPORT_SYMBOL_GPL(tracing_snapshot);
static int resize_buffer_duplicate_size(struct trace_buffer *trace_buf,
@ -6739,7 +6745,7 @@ ftrace_snapshot(unsigned long ip, unsigned long parent_ip,
struct trace_array *tr, struct ftrace_probe_ops *ops,
void *data)
{
tracing_snapshot();
tracing_snapshot_instance(tr);
}
static void
@ -6761,7 +6767,7 @@ ftrace_count_snapshot(unsigned long ip, unsigned long parent_ip,
(*count)--;
}
tracing_snapshot();
tracing_snapshot_instance(tr);
}
static int
@ -6868,7 +6874,7 @@ ftrace_trace_snapshot_callback(struct trace_array *tr, struct ftrace_hash *hash,
ret = register_ftrace_function_probe(glob, tr, ops, count);
if (ret >= 0)
alloc_snapshot(&global_trace);
alloc_snapshot(tr);
return ret < 0 ? ret : 0;
}