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Groups > linux.kernel > #1277944
| From | Steven Rostedt <rostedt@goodmis.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [for-next][PATCH 1/5] ring-buffer: Process commits whenever moving to a new page. |
| Date | 2015-11-26 03:30 +0100 |
| Message-ID | <qyUtQ-6iR-11@gated-at.bofh.it> (permalink) |
| References | <qyUtQ-6iR-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org> 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> --- kernel/trace/ring_buffer.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 631541a53baf..95181e36891a 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -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); -- 2.6.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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[for-next][PATCH 0/5] tracing: Better output when ftrace_bug() is hit Steven Rostedt <rostedt@goodmis.org> - 2015-11-26 03:30 +0100 [for-next][PATCH 3/5] ftrace: Add new type to distinguish what kind of ftrace_bug() Steven Rostedt <rostedt@goodmis.org> - 2015-11-26 03:30 +0100 [for-next][PATCH 1/5] ring-buffer: Process commits whenever moving to a new page. Steven Rostedt <rostedt@goodmis.org> - 2015-11-26 03:30 +0100 [for-next][PATCH 4/5] ftrace: Add variable ftrace_expected for archs to show expected code Steven Rostedt <rostedt@goodmis.org> - 2015-11-26 03:30 +0100 [for-next][PATCH 2/5] tracing: Update cond flag when enabling or disabling a trigger Steven Rostedt <rostedt@goodmis.org> - 2015-11-26 03:30 +0100
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