linux-kernel - Re: [v6 13/15] mm: stop zeroing memory during allocation in vmemmap

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Message-ID: <16bdfd76-d28a-0732-9a15-29cc373e1236@oracle.com>
Date:   Fri, 11 Aug 2017 12:11:24 -0400
From:   Pasha Tatashin <pasha.tatashin@...cle.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        x86@...nel.org, kasan-dev@...glegroups.com, borntraeger@...ibm.com,
        heiko.carstens@...ibm.com, davem@...emloft.net,
        willy@...radead.org, ard.biesheuvel@...aro.org,
        will.deacon@....com, catalin.marinas@....com, sam@...nborg.org
Subject: Re: [v6 13/15] mm: stop zeroing memory during allocation in vmemmap

On 08/11/2017 09:04 AM, Michal Hocko wrote:
> On Mon 07-08-17 16:38:47, Pavel Tatashin wrote:
>> Replace allocators in sprase-vmemmap to use the non-zeroing version. So,
>> we will get the performance improvement by zeroing the memory in parallel
>> when struct pages are zeroed.
> 
> First of all this should be probably merged with the previous patch. The
> I think vmemmap_alloc_block would be better to split up into
> __vmemmap_alloc_block which doesn't zero and vmemmap_alloc_block which
> does zero which would reduce the memset callsites and it would make it
> slightly more robust interface.

Ok, I will add: vmemmap_alloc_block_zero() call, and merge this and the 
previous patches together.