From: Waiman Long <longman@redhat.com>
To: Tim Chen <tim.c.chen@linux.intel.com>,
"Wang, Kemi" <kemi.wang@intel.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
"vbabka@suse.cz" <vbabka@suse.cz>,
Davidlohr Bueso <dave@stgolabs.net>
Cc: "yang.shi@linux.alibaba.com" <yang.shi@linux.alibaba.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Matthew Wilcox <willy@infradead.org>,
"mhocko@kernel.org" <mhocko@kernel.org>,
Colin King <colin.king@canonical.com>,
Andrew Morton <akpm@linux-foundation.org>,
"ldufour@linux.vnet.ibm.com" <ldufour@linux.vnet.ibm.com>,
"lkp@01.org" <lkp@01.org>,
"kirill.shutemov@linux.intel.com"
<kirill.shutemov@linux.intel.com>
Subject: Re: [LKP] [mm] 9bc8039e71: will-it-scale.per_thread_ops -64.1% regression
Date: Wed, 30 Jan 2019 21:54:15 -0500 [thread overview]
Message-ID: <02602a13-e6f1-dfc1-48b6-1cb14bd9dfd0@redhat.com> (raw)
In-Reply-To: <907779d2-09a8-47fb-4d77-c907cd716b3c@linux.intel.com>
On 01/30/2019 07:06 PM, Tim Chen wrote:
> On 12/27/18 6:55 PM, Waiman Long wrote:
>> On 12/27/2018 08:31 PM, Wang, Kemi wrote:
>>> Hi, Waiman
>>> Did you post that patch? Let's see if it helps.
>> I did post the patch a while ago. I will need to rebase it to a new
>> baseline. Will do that in a week or 2.
>>
>> -Longman
>>
> Waiman,
>
> In a large scale OLTP benchmark, we are also seeing a 1% loss in performance
> from patch 9bc8039e71. We'll be interested to try out your patch to
> restore some optimistic spinning on reader held sem.
>
> Thanks.
>
> Tim
I am reworking the rwsem code and reader-optimistic spinning code isn't
ready with the reworked code yet. I need a bit more time to work on that
and certainly keep you posted once it is ready for review.
Cheers,
Longman
prev parent reply other threads:[~2019-01-31 2:54 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-05 5:08 [LKP] [mm] 9bc8039e71: will-it-scale.per_thread_ops -64.1% regression kernel test robot
2018-11-05 17:50 ` Linus Torvalds
2018-11-05 18:28 ` Yang Shi
2018-11-05 18:35 ` Linus Torvalds
2018-11-05 20:17 ` Yang Shi
2018-11-05 20:09 ` Vlastimil Babka
2018-11-05 22:14 ` Linus Torvalds
2018-11-05 22:40 ` Waiman Long
2018-12-28 1:31 ` Wang, Kemi
2018-12-28 2:55 ` Waiman Long
2018-12-28 2:55 ` kemi
2019-01-31 0:06 ` Tim Chen
2019-01-31 2:54 ` Waiman Long [this message]
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