On Thu, Apr 17, 2014 at 05:28:17PM -0400, Waiman Long wrote:
On 04/17/2014 11:49 AM, Peter Zijlstra wrote:
On Thu, Apr 17, 2014 at 11:03:56AM -0400, Waiman Long wrote:
@@ -192,36 +220,25 @@ void queue_spin_lock_slowpath(struct qspinlock *lock,
u32 val)
node-next = NULL;
/*
+*
On 04/18/2014 04:15 AM, Peter Zijlstra wrote:
On Thu, Apr 17, 2014 at 05:28:17PM -0400, Waiman Long wrote:
On 04/17/2014 11:49 AM, Peter Zijlstra wrote:
On Thu, Apr 17, 2014 at 11:03:56AM -0400, Waiman Long wrote:
@@ -192,36 +220,25 @@ void queue_spin_lock_slowpath(struct qspinlock *lock, u32
On Fri, Apr 18, 2014 at 01:32:47PM -0400, Waiman Long wrote:
On 04/18/2014 04:15 AM, Peter Zijlstra wrote:
On Thu, Apr 17, 2014 at 05:28:17PM -0400, Waiman Long wrote:
On 04/17/2014 11:49 AM, Peter Zijlstra wrote:
On Thu, Apr 17, 2014 at 11:03:56AM -0400, Waiman Long wrote:
@@ -192,36 +220,25
On 04/18/2014 01:53 PM, Peter Zijlstra wrote:
On Fri, Apr 18, 2014 at 01:32:47PM -0400, Waiman Long wrote:
On 04/18/2014 04:15 AM, Peter Zijlstra wrote:
On Thu, Apr 17, 2014 at 05:28:17PM -0400, Waiman Long wrote:
On 04/17/2014 11:49 AM, Peter Zijlstra wrote:
On Thu, Apr 17, 2014 at
This patch extracts the logic for the exchange of new and previous tail
code words into a new xchg_tail() function which can be optimized in a
later patch.
Signed-off-by: Waiman Long waiman.l...@hp.com
---
include/asm-generic/qspinlock_types.h |2 +
kernel/locking/qspinlock.c|
On Thu, Apr 17, 2014 at 11:03:56AM -0400, Waiman Long wrote:
@@ -192,36 +220,25 @@ void queue_spin_lock_slowpath(struct qspinlock *lock,
u32 val)
node-next = NULL;
/*
+ * We touched a (possibly) cold cacheline; attempt the trylock once
+ * more in the hope someone
On 04/17/2014 11:49 AM, Peter Zijlstra wrote:
On Thu, Apr 17, 2014 at 11:03:56AM -0400, Waiman Long wrote:
@@ -192,36 +220,25 @@ void queue_spin_lock_slowpath(struct qspinlock *lock, u32
val)
node-next = NULL;
/*
+* We touched a (possibly) cold cacheline; attempt the
