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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: Steven Rostedt <rostedt@goodmis.org>
hifive-unleashed-5.1
Steven Rostedt (Red Hat) 2015-11-17 16:36:06 -05:00 committed by Steven Rostedt
parent 70004986ff
commit 4239c38fe0
1 changed files with 7 additions and 0 deletions
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7
kernel/trace/ring_buffer.c
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@ -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);