From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: Mike Kravetz <mike.kravetz@oracle.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: David Hildenbrand <david@redhat.com>,
Michal Hocko <mhocko@suse.com>,
Oscar Salvador <osalvador@suse.de>, Zi Yan <ziy@nvidia.com>,
Muchun Song <songmuchun@bytedance.com>,
Naoya Horiguchi <naoya.horiguchi@linux.dev>,
David Rientjes <rientjes@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Mike Kravetz <mike.kravetz@oracle.com>
Subject: Re: [PATCH v2 1/4] hugetlb: add demote hugetlb page sysfs interfaces
Date: Fri, 24 Sep 2021 12:38:33 +0530 [thread overview]
Message-ID: <878rzma1se.fsf@linux.ibm.com> (raw)
In-Reply-To: <20210923175347.10727-2-mike.kravetz@oracle.com>
Mike Kravetz <mike.kravetz@oracle.com> writes:
> Two new sysfs files are added to demote hugtlb pages. These files are
> both per-hugetlb page size and per node. Files are:
> demote_size - The size in Kb that pages are demoted to. (read-write)
> demote - The number of huge pages to demote. (write-only)
>
> By default, demote_size is the next smallest huge page size. Valid huge
> page sizes less than huge page size may be written to this file. When
> huge pages are demoted, they are demoted to this size.
>
> Writing a value to demote will result in an attempt to demote that
> number of hugetlb pages to an appropriate number of demote_size pages.
>
> NOTE: Demote interfaces are only provided for huge page sizes if there
> is a smaller target demote huge page size. For example, on x86 1GB huge
> pages will have demote interfaces. 2MB huge pages will not have demote
> interfaces.
Should we also check if the platform allows for
gigantic_page_runtime_supported() ?
-aneesh
next prev parent reply other threads:[~2021-09-24 7:08 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-23 17:53 [PATCH v2 0/4] hugetlb: add demote/split page functionality Mike Kravetz
2021-09-23 17:53 ` [PATCH v2 1/4] hugetlb: add demote hugetlb page sysfs interfaces Mike Kravetz
2021-09-23 21:24 ` Andrew Morton
2021-09-23 22:08 ` Mike Kravetz
2021-09-24 7:08 ` Aneesh Kumar K.V [this message]
2021-09-29 18:22 ` Mike Kravetz
2021-09-24 9:28 ` David Hildenbrand
2021-09-29 19:34 ` Mike Kravetz
2021-09-23 17:53 ` [PATCH v2 2/4] hugetlb: add HPageCma flag and code to free non-gigantic pages in CMA Mike Kravetz
2021-09-24 9:36 ` David Hildenbrand
2021-09-29 19:42 ` Mike Kravetz
2021-09-29 23:21 ` Mike Kravetz
2021-10-01 17:50 ` Mike Kravetz
2021-09-23 17:53 ` [PATCH v2 3/4] hugetlb: add demote bool to gigantic page routines Mike Kravetz
2021-09-23 17:53 ` [PATCH v2 4/4] hugetlb: add hugetlb demote page support Mike Kravetz
2021-09-24 9:44 ` David Hildenbrand
2021-09-29 19:54 ` Mike Kravetz
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