Re: [Query] increased latency observed in cpu hotplug path

2016-09-22 Thread Khan, Imran
On 9/21/2016 9:26 PM, Akinobu Mita wrote: > 2016-09-21 23:06 GMT+09:00 Khan, Imran <kim...@codeaurora.org>: > >>>> commit 084ee793ec1ff4e2171b481642bfbdaa2e10664c >>>> Author: Imran Khan <kim...@codeaurora.org> >>>> Date: Thu Sep 15 16:44:

Re: [Query] increased latency observed in cpu hotplug path

2016-09-22 Thread Khan, Imran
On 9/21/2016 9:26 PM, Akinobu Mita wrote: > 2016-09-21 23:06 GMT+09:00 Khan, Imran : > >>>> commit 084ee793ec1ff4e2171b481642bfbdaa2e10664c >>>> Author: Imran Khan >>>> Date: Thu Sep 15 16:44:02 2016 +0530 >>>> >>>> blk-mq:

Re: [Query] increased latency observed in cpu hotplug path

2016-08-17 Thread Khan, Imran
On 8/16/2016 11:23 AM, Khan, Imran wrote: > On 8/5/2016 12:49 PM, Khan, Imran wrote: >> On 8/1/2016 2:58 PM, Khan, Imran wrote: >>> On 7/30/2016 7:54 AM, Akinobu Mita wrote: >>>> 2016-07-28 22:18 GMT+09:00 Khan, Imran <kim...@codeaurora.org>: >>>>&

Re: [Query] increased latency observed in cpu hotplug path

2016-08-17 Thread Khan, Imran
On 8/16/2016 11:23 AM, Khan, Imran wrote: > On 8/5/2016 12:49 PM, Khan, Imran wrote: >> On 8/1/2016 2:58 PM, Khan, Imran wrote: >>> On 7/30/2016 7:54 AM, Akinobu Mita wrote: >>>> 2016-07-28 22:18 GMT+09:00 Khan, Imran : >>>>> >>>>> Hi,

Re: [Query] increased latency observed in cpu hotplug path

2016-08-15 Thread Khan, Imran
On 8/5/2016 12:49 PM, Khan, Imran wrote: > On 8/1/2016 2:58 PM, Khan, Imran wrote: >> On 7/30/2016 7:54 AM, Akinobu Mita wrote: >>> 2016-07-28 22:18 GMT+09:00 Khan, Imran <kim...@codeaurora.org>: >>>> >>>> Hi, >>>> >>>> Re

Re: [Query] increased latency observed in cpu hotplug path

2016-08-15 Thread Khan, Imran
On 8/5/2016 12:49 PM, Khan, Imran wrote: > On 8/1/2016 2:58 PM, Khan, Imran wrote: >> On 7/30/2016 7:54 AM, Akinobu Mita wrote: >>> 2016-07-28 22:18 GMT+09:00 Khan, Imran : >>>> >>>> Hi, >>>> >>>> Recently we have observed s

Re: [Query] increased latency observed in cpu hotplug path

2016-08-05 Thread Khan, Imran
On 8/1/2016 2:58 PM, Khan, Imran wrote: > On 7/30/2016 7:54 AM, Akinobu Mita wrote: >> 2016-07-28 22:18 GMT+09:00 Khan, Imran <kim...@codeaurora.org>: >>> >>> Hi, >>> >>> Recently we have observed some increased latency in CPU hotplug >

Re: [Query] increased latency observed in cpu hotplug path

2016-08-05 Thread Khan, Imran
On 8/1/2016 2:58 PM, Khan, Imran wrote: > On 7/30/2016 7:54 AM, Akinobu Mita wrote: >> 2016-07-28 22:18 GMT+09:00 Khan, Imran : >>> >>> Hi, >>> >>> Recently we have observed some increased latency in CPU hotplug >>> event in CPU onlin

Re: [Query] increased latency observed in cpu hotplug path

2016-08-01 Thread Khan, Imran
On 7/30/2016 7:54 AM, Akinobu Mita wrote: > 2016-07-28 22:18 GMT+09:00 Khan, Imran <kim...@codeaurora.org>: >> >> Hi, >> >> Recently we have observed some increased latency in CPU hotplug >> event in CPU online path. For online latency we see that block >

Re: [Query] increased latency observed in cpu hotplug path

2016-08-01 Thread Khan, Imran
On 7/30/2016 7:54 AM, Akinobu Mita wrote: > 2016-07-28 22:18 GMT+09:00 Khan, Imran : >> >> Hi, >> >> Recently we have observed some increased latency in CPU hotplug >> event in CPU online path. For online latency we see that block >> layer is executing notifi

[Query] increased latency observed in cpu hotplug path

2016-07-28 Thread Khan, Imran
Hi, Recently we have observed some increased latency in CPU hotplug event in CPU online path. For online latency we see that block layer is executing notification handler for CPU_UP_PREPARE event and this in turn waits for RCU grace period resulting (sometimes) in an execution time of 15-20 ms

[Query] increased latency observed in cpu hotplug path

2016-07-28 Thread Khan, Imran
Hi, Recently we have observed some increased latency in CPU hotplug event in CPU online path. For online latency we see that block layer is executing notification handler for CPU_UP_PREPARE event and this in turn waits for RCU grace period resulting (sometimes) in an execution time of 15-20 ms