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ring-buffer: Do not disable recording when there is an iterator

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Now that the iterator can handle a concurrent writer, do not disable writing
to the ring buffer when there is an iterator present.

Link: http://lkml.kernel.org/r/20200317213416.759770696@goodmis.org

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2020-03-17 17:32:30 -04:00
parent 07b8b10ec9
commit 1039221cc2
1 changed files with 0 additions and 2 deletions
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2
kernel/trace/ring_buffer.c
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@ -4312,7 +4312,6 @@ ring_buffer_read_prepare(struct trace_buffer *buffer, int cpu, gfp_t flags)
iter->cpu_buffer = cpu_buffer; iter->cpu_buffer = cpu_buffer;
atomic_inc(&cpu_buffer->resize_disabled); atomic_inc(&cpu_buffer->resize_disabled);
atomic_inc(&cpu_buffer->record_disabled);
return iter; return iter;
} }
@ -4385,7 +4384,6 @@ ring_buffer_read_finish(struct ring_buffer_iter *iter)
rb_check_pages(cpu_buffer); rb_check_pages(cpu_buffer);
raw_spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags); raw_spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
atomic_dec(&cpu_buffer->record_disabled);
atomic_dec(&cpu_buffer->resize_disabled); atomic_dec(&cpu_buffer->resize_disabled);
kfree(iter->event); kfree(iter->event);
kfree(iter); kfree(iter);