On 09/14/2015 05:41 PM, Davidlohr Bueso wrote:
On Mon, 14 Sep 2015, Waiman Long wrote:
You can't use debugfs if we want to have per-cpu stats. We will have
to use sysfs instead. This will require more code changes. It is
certainly doable, but we have to choose between simplicity and
performan
On Mon, 14 Sep 2015, Waiman Long wrote:
You can't use debugfs if we want to have per-cpu stats. We will have
to use sysfs instead. This will require more code changes. It is
certainly doable, but we have to choose between simplicity and
performance overhead. Right now, I am assuming that lock
On 09/11/2015 07:13 PM, Davidlohr Bueso wrote:
On Fri, 11 Sep 2015, Waiman Long wrote:
A sample of statistics counts after system bootup (with vCPU
overcommit) was:
hash_hops_count=9001
kick_latencies=138047878
kick_unlock_count=9001
kick_wait_count=9000
spurious_wakeup=3
wait_again_count=2
wa
On Fri, 11 Sep 2015, Waiman Long wrote:
A sample of statistics counts after system bootup (with vCPU
overcommit) was:
hash_hops_count=9001
kick_latencies=138047878
kick_unlock_count=9001
kick_wait_count=9000
spurious_wakeup=3
wait_again_count=2
wait_head_count=10
wait_node_count=8994
wake_laten
This patch enables the accumulation of kicking and waiting related
PV qspinlock statistics when the new QUEUED_LOCK_STAT configuration
option is selected. It also enables the collection of kicking and
wakeup latencies which have a heavy dependency on the CPUs being used.
The measured latencies for
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