Displaying 15 results from an estimated 15 matches for "pv_wait_check".
2014 Oct 27
2
[PATCH v12 09/11] pvqspinlock, x86: Add para-virtualization support
...cs_spinlock *no
{
struct pv_qnode *pn = (struct pv_qnode *)node;
- if (!pv_enabled())
- return smp_load_acquire(&lock->val.counter);
-
for (;;) {
unsigned int count;
s8 oldstate;
@@ -328,8 +319,6 @@ static inline void pv_wait_check(struct qspinlock *lock,
struct pv_qnode *pnxt = (struct pv_qnode *)next;
struct pv_qnode *pcur = (struct pv_qnode *)node;
- if (!pv_enabled())
- return;
/*
* Clear the locked and head values of lock holder
*/
diff --git a/kernel/lo...
2014 Oct 27
2
[PATCH v12 09/11] pvqspinlock, x86: Add para-virtualization support
...cs_spinlock *no
{
struct pv_qnode *pn = (struct pv_qnode *)node;
- if (!pv_enabled())
- return smp_load_acquire(&lock->val.counter);
-
for (;;) {
unsigned int count;
s8 oldstate;
@@ -328,8 +319,6 @@ static inline void pv_wait_check(struct qspinlock *lock,
struct pv_qnode *pnxt = (struct pv_qnode *)next;
struct pv_qnode *pcur = (struct pv_qnode *)node;
- if (!pv_enabled())
- return;
/*
* Clear the locked and head values of lock holder
*/
diff --git a/kernel/lo...
2014 Oct 16
2
[PATCH v12 09/11] pvqspinlock, x86: Add para-virtualization support
...laces where races can happen:
+ * 1) Halting of the queue head CPU (in pv_wait_head) and the CPU
+ * kicking by the lock holder in the unlock path (in pv_kick_node).
+ * 2) Halting of the queue node CPU (in pv_link_and_wait_node) and the
+ * the status check by the previous queue head (in pv_wait_check).
+ *
+ * See the comments on those functions to see how the races are being
+ * addressed.
+ */
+
+/*
+ * Spin thresholds for queue spinlock
+ */
+#define QSPIN_THRESHOLD SPIN_THRESHOLD
+#define MAYHALT_THRESHOLD 0x10
+
+/*
+ * CPU state flags
+ */
+#define PV_CPU_ACTIVE 1 /* This CPU is active...
2014 Oct 16
2
[PATCH v12 09/11] pvqspinlock, x86: Add para-virtualization support
...laces where races can happen:
+ * 1) Halting of the queue head CPU (in pv_wait_head) and the CPU
+ * kicking by the lock holder in the unlock path (in pv_kick_node).
+ * 2) Halting of the queue node CPU (in pv_link_and_wait_node) and the
+ * the status check by the previous queue head (in pv_wait_check).
+ *
+ * See the comments on those functions to see how the races are being
+ * addressed.
+ */
+
+/*
+ * Spin thresholds for queue spinlock
+ */
+#define QSPIN_THRESHOLD SPIN_THRESHOLD
+#define MAYHALT_THRESHOLD 0x10
+
+/*
+ * CPU state flags
+ */
+#define PV_CPU_ACTIVE 1 /* This CPU is active...
2014 Oct 29
1
[PATCH v13 09/11] pvqspinlock, x86: Add para-virtualization support
...laces where races can happen:
+ * 1) Halting of the queue head CPU (in pv_wait_head) and the CPU
+ * kicking by the lock holder in the unlock path (in pv_kick_node).
+ * 2) Halting of the queue node CPU (in pv_link_and_wait_node) and the
+ * the status check by the previous queue head (in pv_wait_check).
+ *
+ * See the comments on those functions to see how the races are being
+ * addressed.
+ */
+
+/*
+ * Spin thresholds for queue spinlock
+ */
+#define QSPIN_THRESHOLD SPIN_THRESHOLD
+#define MAYHALT_THRESHOLD 0x10
+
+/*
+ * CPU state flags
+ */
+#define PV_CPU_ACTIVE 1 /* This CPU is active...
2014 Oct 29
1
[PATCH v13 09/11] pvqspinlock, x86: Add para-virtualization support
...laces where races can happen:
+ * 1) Halting of the queue head CPU (in pv_wait_head) and the CPU
+ * kicking by the lock holder in the unlock path (in pv_kick_node).
+ * 2) Halting of the queue node CPU (in pv_link_and_wait_node) and the
+ * the status check by the previous queue head (in pv_wait_check).
+ *
+ * See the comments on those functions to see how the races are being
+ * addressed.
+ */
+
+/*
+ * Spin thresholds for queue spinlock
+ */
+#define QSPIN_THRESHOLD SPIN_THRESHOLD
+#define MAYHALT_THRESHOLD 0x10
+
+/*
+ * CPU state flags
+ */
+#define PV_CPU_ACTIVE 1 /* This CPU is active...
2014 Oct 24
3
[PATCH v12 09/11] pvqspinlock, x86: Add para-virtualization support
On 10/24/2014 04:47 AM, Peter Zijlstra wrote:
> On Thu, Oct 16, 2014 at 02:10:38PM -0400, Waiman Long wrote:
>> +static inline void pv_init_node(struct mcs_spinlock *node)
>> +{
>> + struct pv_qnode *pn = (struct pv_qnode *)node;
>> +
>> + BUILD_BUG_ON(sizeof(struct pv_qnode)> 5*sizeof(struct mcs_spinlock));
>> +
>> + if (!pv_enabled())
>> +
2014 Oct 24
3
[PATCH v12 09/11] pvqspinlock, x86: Add para-virtualization support
On 10/24/2014 04:47 AM, Peter Zijlstra wrote:
> On Thu, Oct 16, 2014 at 02:10:38PM -0400, Waiman Long wrote:
>> +static inline void pv_init_node(struct mcs_spinlock *node)
>> +{
>> + struct pv_qnode *pn = (struct pv_qnode *)node;
>> +
>> + BUILD_BUG_ON(sizeof(struct pv_qnode)> 5*sizeof(struct mcs_spinlock));
>> +
>> + if (!pv_enabled())
>> +
2015 Jan 20
13
[PATCH v14 00/11] qspinlock: a 4-byte queue spinlock with PV support
v13->v14:
- Patches 1 & 2: Add queue_spin_unlock_wait() to accommodate commit
78bff1c86 from Oleg Nesterov.
- Fix the system hang problem when using PV qspinlock in an
over-committed guest due to a racing condition in the
pv_set_head_in_tail() function.
- Increase the MAYHALT_THRESHOLD from 10 to 1024.
- Change kick_cpu into a regular function pointer instead of a
2015 Jan 20
13
[PATCH v14 00/11] qspinlock: a 4-byte queue spinlock with PV support
v13->v14:
- Patches 1 & 2: Add queue_spin_unlock_wait() to accommodate commit
78bff1c86 from Oleg Nesterov.
- Fix the system hang problem when using PV qspinlock in an
over-committed guest due to a racing condition in the
pv_set_head_in_tail() function.
- Increase the MAYHALT_THRESHOLD from 10 to 1024.
- Change kick_cpu into a regular function pointer instead of a
2014 Oct 27
0
[PATCH v12 09/11] pvqspinlock, x86: Add para-virtualization support
..._nodes[0].count);
> }
> EXPORT_SYMBOL(queue_spin_lock_slowpath);
> +
> +#if !defined(_GEN_PV_LOCK_SLOWPATH) && defined(CONFIG_PARAVIRT_SPINLOCKS)
> +/*
> + * Generate the PV version of the queue_spin_lock_slowpath function
> + */
> +#undef pv_init_node
> +#undef pv_wait_check
> +#undef pv_link_and_wait_node
> +#undef pv_wait_head
> +#undef EXPORT_SYMBOL
> +#undef in_pv_code
> +
> +#define _GEN_PV_LOCK_SLOWPATH
> +#define EXPORT_SYMBOL(x)
> +#define in_pv_code return_true
> +#define pv_enabled return_false
> +
> +#include "qs...
2014 Oct 29
15
[PATCH v13 00/11] qspinlock: a 4-byte queue spinlock with PV support
v12->v13:
- Change patch 9 to generate separate versions of the
queue_spin_lock_slowpath functions for bare metal and PV guest. This
reduces the performance impact of the PV code on bare metal systems.
v11->v12:
- Based on PeterZ's version of the qspinlock patch
(https://lkml.org/lkml/2014/6/15/63).
- Incorporated many of the review comments from Konrad Wilk and
Paolo
2014 Oct 29
15
[PATCH v13 00/11] qspinlock: a 4-byte queue spinlock with PV support
v12->v13:
- Change patch 9 to generate separate versions of the
queue_spin_lock_slowpath functions for bare metal and PV guest. This
reduces the performance impact of the PV code on bare metal systems.
v11->v12:
- Based on PeterZ's version of the qspinlock patch
(https://lkml.org/lkml/2014/6/15/63).
- Incorporated many of the review comments from Konrad Wilk and
Paolo
2014 Oct 16
15
[PATCH v12 00/11] qspinlock: a 4-byte queue spinlock with PV support
v11->v12:
- Based on PeterZ's version of the qspinlock patch
(https://lkml.org/lkml/2014/6/15/63).
- Incorporated many of the review comments from Konrad Wilk and
Paolo Bonzini.
- The pvqspinlock code is largely from my previous version with
PeterZ's way of going from queue tail to head and his idea of
using callee saved calls to KVM and XEN codes.
v10->v11:
- Use a
2014 Oct 16
15
[PATCH v12 00/11] qspinlock: a 4-byte queue spinlock with PV support
v11->v12:
- Based on PeterZ's version of the qspinlock patch
(https://lkml.org/lkml/2014/6/15/63).
- Incorporated many of the review comments from Konrad Wilk and
Paolo Bonzini.
- The pvqspinlock code is largely from my previous version with
PeterZ's way of going from queue tail to head and his idea of
using callee saved calls to KVM and XEN codes.
v10->v11:
- Use a