linux-kernel - Re: [PATCH 0/3] Add support for free vmemmap pages of HugeTLB for arm64

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Message-ID: <e7ec1e95-5aa9-0147-46fa-91cda70fd4af@oracle.com>
Date:   Fri, 12 Mar 2021 09:38:17 -0800
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     "Bodeddula, Balasubramaniam" <bodeddub@...zon.com>,
        Chen Huang <chenhuang5@...wei.com>,
        Muchun Song <songmuchun@...edance.com>,
        "will@...nel.org" <will@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "david@...hat.com" <david@...hat.com>,
        "osalvador@...e.de" <osalvador@...e.de>,
        "rientjes@...gle.com" <rientjes@...gle.com>
Cc:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "duanxiongchun@...edance.com" <duanxiongchun@...edance.com>,
        "Umesh Sargur, Gautam" <sargur@...zon.com>
Subject: Re: [PATCH 0/3] Add support for free vmemmap pages of HugeTLB for
 arm64

On 3/11/21 10:00 AM, Bodeddula, Balasubramaniam wrote:
> Hey, thanks for the testing steps.
> 
> I tried applying these patches on 5.11 source tree. These patches were applied on top of the x86 patch, which worked fine. But in this case we don't see the same improvements in our testing. We made sure we set CONFIG_HUGETLB_PAGE_FREE_VMEMMAP=y in our .config file.
> 
> Are we missing any more configuration settings to get this patch to work on ARM? Can you please help with general troubleshooting steps to debug what could be going wrong.
> 

Are you specifying 'hugetlb_free_vmemmap=on' on the kernel command line?
This feature is only enabled if you 'opt in' via the command line option.

-- 
Mike Kravetz