linux-kernel - Re: [RFC 1/2] mm: disable LRU pagevec during the migration temporarily

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Message-ID: <YC2I/d2DnXRQ7eq3@google.com>
Date:   Wed, 17 Feb 2021 13:22:05 -0800
From:   Minchan Kim <minchan@...nel.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>, cgoldswo@...eaurora.org,
        linux-fsdevel@...r.kernel.org, david@...hat.com, vbabka@...e.cz,
        viro@...iv.linux.org.uk, joaodias@...gle.com
Subject: Re: [RFC 1/2] mm: disable LRU pagevec during the migration
 temporarily

On Wed, Feb 17, 2021 at 09:11:43PM +0000, Matthew Wilcox wrote:
> On Wed, Feb 17, 2021 at 12:51:25PM -0800, Minchan Kim wrote:
> > I'd like to avoid atomic operation if we could.
> 
> Why do you think that the spinlock is better?
> 

Michal suggested atomic_inc in writeside and atomic_read in readside.
I wanted to avoid atomic operation in readside path.

You are suggesting atomic for writeside and just read(not atomic_read)
in readside?