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

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Message-ID: <a2f423cf-9413-6bc8-e4d8-92374fc0449e@amperemail.onmicrosoft.com>
Date:   Wed, 1 Sep 2021 11:07:41 +0800
From:   Shijie Huang <shijie@...eremail.onmicrosoft.com>
To:     torvalds@...ux-foundation.org, viro@...iv.linux.org.uk,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        song.bao.hua@...ilicon.com
Cc:     linux-kernel@...r.kernel.org,
        Frank Wang <zwang@...erecomputing.com>
Subject: Is it possible to implement the per-node page cache for
 programs/libraries?

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?

    We can do it like this:

         1.) Add a new system call to control specific files to 
NUMA-aware, such as:

                    set_numa_aware("/usr/lib/libc.so", enable);

             After the system call, the page cache of libc.so has the 
flags "NUMA_ENABLED"

         2.) When A new process tries to setup the MMU page table for 
libc.so, it will check

              if NUMA_ENABLED is set. If it set, the kernel will give a 
page which is bind to the process's NUMA node.

              By this way, we can eliminate the remote-access for 
programs/shared library.

Is this proposal ok?  Or do you have a better idea?

Thanks

Huang Shijie