linux-kernel - Re: [PATCH RFC] s390x/vmem: get rid of memory segment list

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Message-Id: <93B4CEE2-3C8D-481F-89BC-09C931866201@redhat.com>
Date:   Thu, 25 Jun 2020 21:54:56 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Heiko Carstens <heiko.carstens@...ibm.com>
Cc:     David Hildenbrand <david@...hat.com>, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-mm@...ck.org,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>
Subject: Re: [PATCH RFC] s390x/vmem: get rid of memory segment list



> Am 25.06.2020 um 21:38 schrieb Heiko Carstens <heiko.carstens@...ibm.com>:
> 
> On Thu, Jun 25, 2020 at 05:00:29PM +0200, David Hildenbrand wrote:
>> This smells like a leftover from ancient times, let's get rid of it. We
>> can now convert vmem_remove_mapping() into a void function - everybody
>> ignored the return value already.
> 
> This buys us what? Except that we get rid of a bit of code?

I‘m looking into virtio-mem support for s390x, including vmemmap/vmem optimizations. Virtio-mem adds/removes memory in memory block granularity, which results in one list entry for essentially each memory section. That seems to be easy to avoid.

Thanks