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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2015-11-17 16:36:06 -0500
committerSteven Rostedt <rostedt@goodmis.org>2015-11-25 15:24:05 -0500
commit4239c38fe0b3847e1e6d962c74b41b08ba0e2990 (patch)
tree234c0d0be4a749956e455bf3f636f219d6e2389a /kernel/trace/ring_buffer.c
parent70004986ffdf36d8bc787403af2571aeeef96595 (diff)
downloadlinux-4239c38fe0b3847e1e6d962c74b41b08ba0e2990.tar.bz2
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>
Diffstat (limited to 'kernel/trace/ring_buffer.c')
-rw-r--r--kernel/trace/ring_buffer.c7
1 files changed, 7 insertions, 0 deletions
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);