From: Alex Shi <alex.shi@linux.alibaba.com>
To: Alexander Duyck <alexander.duyck@gmail.com>
Cc: Yang Shi <yang.shi@linux.alibaba.com>,
kbuild test robot <lkp@intel.com>,
Rong Chen <rong.a.chen@intel.com>,
Konstantin Khlebnikov <khlebnikov@yandex-team.ru>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Hugh Dickins <hughd@google.com>,
LKML <linux-kernel@vger.kernel.org>,
Daniel Jordan <daniel.m.jordan@oracle.com>,
linux-mm <linux-mm@kvack.org>, Shakeel Butt <shakeelb@google.com>,
Matthew Wilcox <willy@infradead.org>,
Johannes Weiner <hannes@cmpxchg.org>, Tejun Heo <tj@kernel.org>,
cgroups@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Wei Yang <richard.weiyang@gmail.com>,
Mel Gorman <mgorman@techsingularity.net>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>
Subject: Re: [RFC PATCH v2 5/5] mm: Split move_pages_to_lru into 3 separate passes
Date: Thu, 20 Aug 2020 17:56:36 +0800 [thread overview]
Message-ID: <87ded438-e908-117d-ecfb-1af7224d46da@linux.alibaba.com> (raw)
In-Reply-To: <CAKgT0Ud3CZ8KHLXCrWNGJAX85x23-EWLnAV63-NMmJ+5vD1JAA@mail.gmail.com>
在 2020/8/19 下午10:42, Alexander Duyck 写道:
>> It's actually changed the meaning from current func. which I had seen a bug if no relock.
>> but after move to 5.9 kernel, I can not reprodce the bug any more. I am not sure if 5.9 fixed
>> the problem, and we don't need relock here.
> So I am not sure what you mean here about "changed the meaning from
> the current func". Which function are you referring to and what
> changed?
>
> From what I can tell the pages cannot change memcg because they were
> isolated and had the LRU flag stripped. They shouldn't be able to
> change destination LRU vector as a result. Assuming that, then they
> can all be processed under same LRU lock and we can avoid having to
> release it until we are forced to do so to call putback_lru_page or
> destroy the compound pages that were freed while we were shrinking the
> LRU lists.
>
I had sent a bug which base on 5.8 kernel.
https://lkml.org/lkml/2020/7/28/465
I am not sure it was fixed in new kernel. The original line was introduced by Hugh Dickins
I believe it would be great if you can get comments from him.
Thanks
Alex
next prev parent reply other threads:[~2020-08-20 10:03 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-19 4:26 [RFC PATCH v2 0/5] Minor cleanups and performance optimizations for LRU rework Alexander Duyck
2020-08-19 4:27 ` [RFC PATCH v2 1/5] mm: Identify compound pages sooner in isolate_migratepages_block Alexander Duyck
2020-08-19 7:48 ` Alex Shi
2020-08-19 11:43 ` Matthew Wilcox
2020-08-19 14:48 ` Alexander Duyck
2020-08-19 4:27 ` [RFC PATCH v2 2/5] mm: Drop use of test_and_set_skip in favor of just setting skip Alexander Duyck
2020-08-19 7:50 ` Alex Shi
2020-08-19 4:27 ` [RFC PATCH v2 3/5] mm: Add explicit page decrement in exception path for isolate_lru_pages Alexander Duyck
2020-08-19 7:50 ` Alex Shi
2020-08-19 14:52 ` Alexander Duyck
2020-08-19 4:27 ` [RFC PATCH v2 4/5] mm: Split release_pages work into 3 passes Alexander Duyck
2020-08-19 7:53 ` Alex Shi
2020-08-19 14:57 ` Alexander Duyck
2020-08-20 9:49 ` Alex Shi
2020-08-20 14:13 ` Alexander Duyck
2020-08-19 4:27 ` [RFC PATCH v2 5/5] mm: Split move_pages_to_lru into 3 separate passes Alexander Duyck
2020-08-19 7:56 ` Alex Shi
2020-08-19 14:42 ` Alexander Duyck
2020-08-20 9:56 ` Alex Shi [this message]
2020-08-20 17:15 ` Alexander Duyck
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