linux-kernel - Re: Is it possible to implement the per-node page cache for programs/libraries?

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Date:   Wed, 1 Sep 2021 13:10:37 +0000
From:   Huang Shijie <shijie@...amperecomputing.com>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Shijie Huang <shijie@...eremail.onmicrosoft.com>,
        torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
        linux-mm@...ck.org, song.bao.hua@...ilicon.com,
        linux-kernel@...r.kernel.org,
        Frank Wang <zwang@...erecomputing.com>
Subject: Re: Is it possible to implement the per-node page cache for
 programs/libraries?

On Wed, Sep 01, 2021 at 04:55:01AM +0000, Al Viro wrote:
> On Wed, Sep 01, 2021 at 11:07:41AM +0800, Shijie Huang wrote:
> > Hi Everyone,
> > 
> >     In the NUMA, we only have one page cache for each file. For the
> > program/shared libraries, the
> > 
> > remote-access delays longer then the  local-access.
> > 
> > So, is it possible to implement the per-node page cache for
> > programs/libraries?
> 
> What do you mean, per-node page cache?  Multiple pages for the same
> area of file?  That'd be bloody awful on coherency...
Yes. per-NUMA-node page cache.

We can limit the files to program/(shared libraries) which are read-only mostly,
and do not need coherency.

Thanks
Huang Shijie