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From: Qi Zheng <qi.zheng@linux.dev>
To: paulmck@kernel.org, Kirill Tkhai <tkhai@ya.ru>
Cc: RCU <rcu@vger.kernel.org>, "Yujie Liu" <yujie.liu@intel.com>,
	oe-lkp@lists.linux.dev, lkp@intel.com,
	linux-kernel@vger.kernel.org,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Vlastimil Babka" <vbabka@suse.cz>,
	"Roman Gushchin" <roman.gushchin@linux.dev>,
	"Christian König" <christian.koenig@amd.com>,
	"David Hildenbrand" <david@redhat.com>,
	"Davidlohr Bueso" <dave@stgolabs.net>,
	"Johannes Weiner" <hannes@cmpxchg.org>,
	"Michal Hocko" <mhocko@kernel.org>,
	"Muchun Song" <muchun.song@linux.dev>,
	"Shakeel Butt" <shakeelb@google.com>,
	"Yang Shi" <shy828301@gmail.com>,
	linux-mm@kvack.org, ying.huang@intel.com, feng.tang@intel.com,
	fengwei.yin@intel.com
Subject: Re: [linus:master] [mm] f95bdb700b: stress-ng.ramfs.ops_per_sec -88.8% regression
Date: Tue, 30 May 2023 11:07:29 +0800	[thread overview]
Message-ID: <26da75a6-115f-a17a-73bb-381a6b4a3a75@linux.dev> (raw)
In-Reply-To: <095806f1-f7f0-4914-b04b-c874fb25bb83@paulmck-laptop>

Hi,

On 2023/5/29 20:51, Paul E. McKenney wrote:
> On Mon, May 29, 2023 at 10:39:21AM +0800, Qi Zheng wrote:

[...]

>>
>> Thanks for such a detailed explanation.
>>
>> Now I think we can continue to try to complete the idea[1] from
>> Kirill Tkhai. The patch moves heavy synchronize_srcu() to delayed
>> work, so it doesn't affect on user-visible unregistration speed.
>>
>> [1]. https://lore.kernel.org/lkml/153365636747.19074.12610817307548583381.stgit@localhost.localdomain/
> 
> A blast from the past!  ;-)
> 
> But yes, moving the long-latency synchronize_srcu() off the user-visible
> critical code path can be even better.

Yeah, I applied these patches  ([PATCH RFC 04/10]~[PATCH RFC 10/10],
with few conflicts), the ops/s does get back to the previous levels.

I'll continue updating this patchset after doing more testing.

Thanks,
Qi

> 
> 							Thanx, Paul

  reply	other threads:[~2023-05-30  3:07 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-23  1:35 [linus:master] [mm] f95bdb700b: stress-ng.ramfs.ops_per_sec -88.8% regression kernel test robot
2023-05-23  3:05 ` Qi Zheng
2023-05-24  7:31   ` Yujie Liu
2023-05-24  8:36     ` Qi Zheng
2023-05-24 11:08       ` Qi Zheng
2023-05-24 11:22         ` Qi Zheng
2023-05-24 11:56         ` Qi Zheng
2023-05-25  4:03           ` Qi Zheng
2023-05-27 11:14             ` Paul E. McKenney
2023-05-29  2:39               ` Qi Zheng
2023-05-29 12:51                 ` Paul E. McKenney
2023-05-30  3:07                   ` Qi Zheng [this message]
2023-06-01  0:57                     ` Kirill Tkhai
2023-06-01  8:34                       ` Qi Zheng
     [not found]                         ` <932751685611907@mail.yandex.ru>
2023-06-01 10:44                           ` Qi Zheng
2023-06-18 10:59 ` Linux regression tracking #adding (Thorsten Leemhuis)

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