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Message-ID: <YTCkhjqXMshBr4Qu@hsj>
Date: Thu, 2 Sep 2021 10:16:38 +0000
From: Huang Shijie <shijie@...amperecomputing.com>
To: Matthew Wilcox <willy@...radead.org>
Cc: Shijie Huang <shijie@...eremail.onmicrosoft.com>,
torvalds@...ux-foundation.org, viro@...iv.linux.org.uk,
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 Thu, Sep 02, 2021 at 12:58:02AM +0100, Matthew Wilcox wrote:
> On Wed, Sep 01, 2021 at 02:25:34PM +0000, Huang Shijie wrote:
> > On Wed, Sep 01, 2021 at 01:30:45PM +0000, Huang Shijie wrote:
> > > On Wed, Sep 01, 2021 at 04:25:01AM +0100, Matthew Wilcox wrote:
> > > > On Wed, Sep 01, 2021 at 11:07:41AM +0800, Shijie Huang wrote:
> > > > > 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?
> > > >
> > > > At this point, we have no way to support text replication within a
> > > > process. So what you're suggesting (if implemented) would work for
> > >
> > > I created a glibc patch which can do the text replication within a process.
> > The "text replication" means the shared libraries, not program itself.
>
> Thinking about it some more, if you're ok with it only being shared
> libraries, you can do this:
>
> for i in `seq 0 3`; do \
> cp --reflink=always /lib/x86_64-linux-gnu/libc.so.6 \
> /lib/x86_64-linux-gnu/libc.so.6.numa$i; \
> done
>
> Reflinked files don't share page cache, so you can do this all in
> userspace with no kernel changes.
This is not grace enough :)
And customers may not accept it..
For the shared libraries, it is better to change the glibc/ld.so.
For the program itself, it is better to change the linux kernel.
Thanks
Huang Shijie
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