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Commit 4239c38f authored by Steven Rostedt (Red Hat)'s avatar Steven Rostedt (Red Hat) Committed by Steven Rostedt
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ring-buffer: Process commits whenever moving to a new page. 



When crossing over to a new page, commit the current work. This will allow
readers to get data with less latency, and also simplifies the work to get
timestamps working for interrupted events.

Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 70004986

kernel/trace/ring_buffer.c

+7 −0
Original line number Diff line number Diff line
@@ -2129,6 +2129,8 @@ rb_reset_tail(struct ring_buffer_per_cpu *cpu_buffer, 
	local_sub(length, &tail_page->write);

}



static inline void rb_end_commit(struct ring_buffer_per_cpu *cpu_buffer);



/*

 * This is the slow path, force gcc not to inline it.

 */
@@ -2220,6 +2222,11 @@ rb_move_tail(struct ring_buffer_per_cpu *cpu_buffer, 


	rb_reset_tail(cpu_buffer, tail, info);



	/* Commit what we have for now. */

	rb_end_commit(cpu_buffer);

	/* rb_end_commit() decs committing */

	local_inc(&cpu_buffer->committing);



	/* fail and let the caller try again */

	return ERR_PTR(-EAGAIN);