linux-kernel - Re: [PATCH 0/6] convert locked_vm from unsigned long to atomic64

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Message-ID: <20190403165257.prekuppqbcempuxo@ca-dmjordan1.us.oracle.com>
Date:   Wed, 3 Apr 2019 12:52:57 -0400
From:   Daniel Jordan <daniel.m.jordan@...cle.com>
To:     Steven Sistare <steven.sistare@...cle.com>
Cc:     Daniel Jordan <daniel.m.jordan@...cle.com>,
        akpm@...ux-foundation.org, linux_lkml_grp@...cle.com,
        Alan Tull <atull@...nel.org>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Alex Williamson <alex.williamson@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christoph Lameter <cl@...ux.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Michael Ellerman <mpe@...erman.id.au>,
        Moritz Fischer <mdf@...nel.org>,
        Paul Mackerras <paulus@...abs.org>, Wu Hao <hao.wu@...el.com>,
        linux-mm@...ck.org, kvm@...r.kernel.org, kvm-ppc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] convert locked_vm from unsigned long to atomic64_t

On Wed, Apr 03, 2019 at 08:51:13AM -0400, Steven Sistare wrote:
> On 4/2/2019 4:41 PM, Daniel Jordan wrote:
> > [1] https://lore.kernel.org/linux-mm/20190211224437.25267-1-daniel.m.jordan@oracle.com/
> 
>   You could clean all 6 patches up nicely with a common subroutine that
> increases locked_vm subject to the rlimit.  Pass a bool arg that is true if
> the  limit should be enforced, !dma->lock_cap for one call site, and
> !capable(CAP_IPC_LOCK) for the rest.  Push the warnings and debug statements
> to the subroutine as well.  One patch could refactor, and a second could
> change the locking method.

Yes, I tried writing, but didn't end up including, such a subroutine for [1].
The devil was in the details, but with the cmpxchg business, it's more
worthwhile to iron all those out.  I'll give it a try.