linux-kernel - Re: [PATCH 2/2 - v2] MM: Discard NR_UNSTABLE_NFS, use NR

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Message-ID: <87k12sw5ws.fsf@notabene.neil.brown.name>
Date:   Tue, 07 Apr 2020 09:28:19 +1000
From:   NeilBrown <neilb@...e.de>
To:     Jan Kara <jack@...e.cz>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Trond Myklebust <trondmy@...merspace.com>,
        "Anna.Schumaker\@Netapp.com" <Anna.Schumaker@...app.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jan Kara <jack@...e.cz>, linux-mm@...ck.org,
        linux-nfs@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2 - v2] MM: Discard NR_UNSTABLE_NFS, use NR_WRITEBACK instead.

On Fri, Apr 03 2020, Jan Kara wrote:
>
> So I don't think we can just remove lines from procfs files like this. That
> has a high potential of breaking some userspace app that is not careful
> enough when parsing the file. So I think that we need to leave there the
> format string and just replace K(node_page_state(pgdat, NR_UNSTABLE_NFS))
> with 0.

OK.  I assume changing the static trace points isn't a problem though?

Thanks,
NeilBrown

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