diff options
author | Denys Vlasenko | 2015-05-26 17:48:34 +0200 |
---|---|---|
committer | Paul E. McKenney | 2015-07-15 14:43:52 -0700 |
commit | d5671f6bf2a672cfa72ef2cbac5cc53a4539690d (patch) | |
tree | 1ba8b82785b4f54aec466e047bad257a2e9c9f33 /.gitignore | |
parent | d1ec4c34c7a9f328e43ea87522119258194f28f8 (diff) |
rcu: Deinline rcu_read_lock_sched_held() if DEBUG_LOCK_ALLOC
DEBUG_LOCK_ALLOC=y is not a production setting, but it is
not very unusual either. Many developers routinely
use kernels built with it enabled.
Apart from being selected by hand, it is also auto-selected by
PROVE_LOCKING "Lock debugging: prove locking correctness" and
LOCK_STAT "Lock usage statistics" config options.
LOCK STAT is necessary for "perf lock" to work.
I wouldn't spend too much time optimizing it, but this particular
function has a very large cost in code size: when it is deinlined,
code size decreases by 830,000 bytes:
text data bss dec hex filename
85674192 22294776 20627456 128596424 7aa39c8 vmlinux.before
84837612 22294424 20627456 127759492 79d7484 vmlinux
(with this config: http://busybox.net/~vda/kernel_config)
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
CC: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
CC: Josh Triplett <josh@joshtriplett.org>
CC: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
CC: Lai Jiangshan <laijs@cn.fujitsu.com>
CC: Tejun Heo <tj@kernel.org>
CC: Oleg Nesterov <oleg@redhat.com>
CC: linux-kernel@vger.kernel.org
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to '.gitignore')
0 files changed, 0 insertions, 0 deletions