lkml.org 
[lkml]   [2014]   [Dec]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
Subject[for-next][PATCH 0/2] tracing: Remove bottle neck mutex in splicing from ring buffer
While profiling with trace-cmd, I found that the there was a global
mutex being taken in the per-cpu splice code. This was slowing down
the recording and causing more missed events than necessary.

By adding a ref count to the tracer, and preventing the tracer from
changing when the ref count is non-zero (when a trace file is opened)
we can remove the taking of the trace_types_lock mutex from the
splice page and speed things up a bit.

git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
for-next

Head SHA1: d716ff71dd12bc6328f84a9ec1c3647daf01c827


Steven Rostedt (Red Hat) (2):
tracing: Add ref count to tracer for when they are being read by pipe
tracing: Remove taking of trace_types_lock in pipe files

----
kernel/trace/trace.c | 126 ++++++++++++++++++---------------------------------
kernel/trace/trace.h | 1 +
2 files changed, 44 insertions(+), 83 deletions(-)



\
 
 \ /
  Last update: 2014-12-23 17:41    [W:0.046 / U:0.216 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site