linux-kernel - Re: [PATCH v2] mm: Introduce new function vm_insert_kmem

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Date:   Fri, 5 Oct 2018 20:09:03 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Souptick Joarder <jrdr.linux@...il.com>
Cc:     Matthew Wilcox <willy@...radead.org>, linux@...linux.org.uk,
        Robin van der Gracht <robin@...tonic.nl>,
        stefanr@...6.in-berlin.de, hjc@...k-chips.com,
        Heiko Stübner <heiko@...ech.de>,
        Dave Airlie <airlied@...ux.ie>, robin.murphy@....com,
        iamjoonsoo.kim@....com, Andrew Morton <akpm@...ux-foundation.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Kees Cook <keescook@...omium.org>, treding@...dia.com,
        mhocko@...e.com, Dan Williams <dan.j.williams@...el.com>,
        kirill.shutemov@...ux.intel.com,
        Mark Rutland <mark.rutland@....com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kate Stewart <kstewart@...uxfoundation.org>, tchibo@...gle.com,
        riel@...hat.com, minchan@...nel.org,
        Peter Zijlstra <peterz@...radead.org>, ying.huang@...el.com,
        Andi Kleen <ak@...ux.intel.com>, rppt@...ux.vnet.ibm.com,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Arnd Bergmann <arnd@...db.de>, cpandya@...eaurora.org,
        hannes@...xchg.org, Joe Perches <joe@...ches.com>,
        mcgrof@...nel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux1394-devel@...ts.sourceforge.net,
        dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org, Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH v2] mm: Introduce new function vm_insert_kmem_page

On Fri, Oct 5, 2018 at 2:11 PM Souptick Joarder <jrdr.linux@...il.com> wrote:
>
> On Fri, Oct 5, 2018 at 4:19 PM Miguel Ojeda
> <miguel.ojeda.sandonis@...il.com> wrote:
> >
> >   1. Introduce the vmf_* API
> >   2. Change all PF-users users to that (leaving all non-PF ones
> > untouched!) -- if this is too big, you can split this patch into
> > several patches, one per subsystem, etc.
>
> We are done with step 2. All the PF-users are converted to use
> vmf_insert_page. ( Ref - linux-next-20181005)

They are not supposed to be "steps". You did it with 70+ commits (!!)
over the course of several months. Why a tree wasn't created, stuff
developed there, and when done, submitted it for review?

> >
> > Otherwise, if you want to pursue Matthew's idea:
> >
> >   4. Introduce the vm_insert_range (possibly leveraging
> > vm_insert_page, or not; you have to see what is best).
> >   5. Replace those callers that can take advantage of vm_insert_range
> >   6. Remove vm_insert_page and replace callers with vm_insert_range
> > (only if it is not worth to keep vm_insert_range, again justifying it
> > *on its own merits*)
>
> Step 4 to 6, going to do it.  It is part of plan now :-)
>

Fine, but you haven't answered to the other parts of my email: you
don't explain why you choose one alternative over the others, you
simply keep changing the approach.

Cheers,
Miguel