linux-kernel - Re: [PATCH next] mm/swap.c: reduce lock contention in lru_cache

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Message-ID: <5f8300ea-2abc-5cee-d837-f20e535f19c2@linux.alibaba.com>
Date:   Fri, 27 Nov 2020 11:14:49 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>
Cc:     Yu Zhao <yuzhao@...gle.com>,
        Konstantin Khlebnikov <koct9i@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>,
        Michal Hocko <mhocko@...e.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH next] mm/swap.c: reduce lock contention in lru_cache_add



在 2020/11/26 下午11:55, Matthew Wilcox 写道:
> On Thu, Nov 26, 2020 at 04:44:04PM +0100, Vlastimil Babka wrote:
>> However, Matthew wanted to increase pagevec size [1] and once 15^2 becomes
>> 63^2, it starts to be somewhat more worrying.
>>
>> [1] https://lore.kernel.org/linux-mm/20201105172651.2455-1-willy@infradead.org/
> 
> Well, Tim wanted it ;-)
> 
> I would suggest that rather than an insertion sort (or was it a bubble
> sort?), we should be using a Shell sort.  It's ideal for these kinds of
> smallish arrays.
> 
> https://en.wikipedia.org/wiki/Shellsort
> 

Uh, looks perfect good!. I gonna look into it. :)

Thanks!