linux-kernel - Re: [PATCH] mm/lru: simplify is_file_lru() and is_active

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Message-ID: <20201117175900.GS29991@casper.infradead.org>
Date:   Tue, 17 Nov 2020 17:59:00 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Hui Su <sh_def@....com>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/lru: simplify is_file_lru() and is_active_lru()

On Wed, Nov 18, 2020 at 01:56:58AM +0800, Hui Su wrote:
> On Tue, Nov 17, 2020 at 05:47:27PM +0000, Matthew Wilcox wrote:
> > On Wed, Nov 18, 2020 at 01:46:33AM +0800, Hui Su wrote:
> > > On Tue, Nov 17, 2020 at 05:41:17PM +0000, Matthew Wilcox wrote:
> > > > On Wed, Nov 18, 2020 at 01:12:42AM +0800, Hui Su wrote:
> > > > > lru_list lru bit 0 can tell whether the list is
> > > > > avtive lru-list or not.
> > > > > lru_list lru bit 1 can tell whether the list is
> > > > > file lru-list or not.
> > > > > 
> > > > > And fix some define type in shrink_active_list()
> > > > > and get_scan_count().
> > > > > 
> > > > > v1->v2:
> > > > > correct the commit message, and fix the define type.
> > > > 
> > > > No, still incorrect.
> > > 
> > > I am a little confused, can you tell in detail?
> > 
> > Have you booted a kernel with this change?  Have you run any kind of
> > tests on it?
> 
> Yes, I boot it with qemu-system-x86_64-4.1.50 on ubuntu20.04:
> qemu-system-x86_64 -kernel /home/rlk/workspace/compile/out/arch/x86_64/boot/bzImage -hda \
>  /home/rlk/myspace/qemu_build/rootfs.img -append "root=/dev/sda console=ttyS0" -nographic
> 
> using the kernel compiled with ubuntu20.04's default .config.
> 
> It seems nothing abnormal.
> And i did not do other test.

Maybe you should ... how about LTP?  I think that's pretty straightforward
to set up and run.