From: Mike Kravetz <mike.kravetz@oracle.com>
To: Oscar Salvador <osalvador@suse.de>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Michal Hocko <mhocko@kernel.org>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
Muchun Song <songmuchun@bytedance.com>,
David Hildenbrand <david@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC PATCH 3/3] hugetlb: convert PageHugeTemporary() to HPageTempSurplus
Date: Fri, 15 Jan 2021 09:47:02 -0800 [thread overview]
Message-ID: <6735bbc5-4eae-b541-d47d-23f7f98b00cf@oracle.com> (raw)
In-Reply-To: <20210115101629.GA5213@linux>
On 1/15/21 2:16 AM, Oscar Salvador wrote:
> On Mon, Jan 11, 2021 at 01:01:52PM -0800, Mike Kravetz wrote:
>> Use new hugetlb specific flag HPageTempSurplus to replace the
>> PageHugeTemporary() interfaces.
>>
>> Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
>> ---
>> mm/hugetlb.c | 38 +++++++++-----------------------------
>> 1 file changed, 9 insertions(+), 29 deletions(-)
>>
>> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
>> index 34ce82f4823c..949e1f987319 100644
>> --- a/mm/hugetlb.c
>> +++ b/mm/hugetlb.c
>> @@ -58,6 +58,7 @@ static unsigned long hugetlb_cma_size __initdata;
>> enum htlb_page_flags {
>> HPAGE_RestoreReserve = 0,
>> HPAGE_Migratable,
>> + HPAGE_TempSurplus,
>> };
>>
>> /*
>> @@ -99,6 +100,7 @@ void ClearHPage##flname(struct page *page) \
>>
>> HPAGEFLAG(RestoreReserve)
>> EXT_HPAGEFLAG(Migratable)
>> +HPAGEFLAG(TempSurplus)
>
> Would HPAGE_Temporary/Temporary not be a better fit?
Yes it would.
> The point about current PageHugeTemporary is that these pages are temporary as
> they do not belong to the pool and will vanish once the last reference gets drop.
> We do not really care that much about the surplus part?
>
> Besides, alloc_migrate_huge_page seems to not want to thread these pages as surplus.
>
All correct, not sure why I was thinking 'surplus' when naming the flag.
> Also, I would add a comment either next to each flag or above
> the enum htlb_page_flags (probably the latter) with a brief explanation
> of each flag.
Will do.
--
Mike Kravetz
> Besides that, it looks fine to me.
> Here I do not see the same problem in
> stripping the PageHuge check in PageHugeTemporary, as I did in previous patch,
> because all callers of it make sure they operate on a hugetlb page.
>
next prev parent reply other threads:[~2021-01-15 17:47 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-11 21:01 [RFC PATCH 0/3] create hugetlb flags to consolidate state Mike Kravetz
2021-01-11 21:01 ` [RFC PATCH 1/3] hugetlb: use page.private for hugetlb specific page flags Mike Kravetz
2021-01-12 3:24 ` [External] " Muchun Song
2021-01-13 13:54 ` Oscar Salvador
2021-01-13 17:49 ` Mike Kravetz
2021-01-13 14:45 ` Matthew Wilcox
2021-01-13 17:51 ` Mike Kravetz
2021-01-11 21:01 ` [RFC PATCH 2/3] hugetlb: convert page_huge_active() to HPageMigratable flag Mike Kravetz
2021-01-12 3:45 ` [External] " Muchun Song
2021-01-15 9:17 ` Oscar Salvador
2021-01-15 17:43 ` Mike Kravetz
2021-01-15 20:05 ` Mike Kravetz
2021-01-15 20:29 ` Oscar Salvador
2021-01-15 21:25 ` Mike Kravetz
2021-01-15 20:38 ` Oscar Salvador
2021-01-11 21:01 ` [RFC PATCH 3/3] hugetlb: convert PageHugeTemporary() to HPageTempSurplus Mike Kravetz
2021-01-15 10:16 ` Oscar Salvador
2021-01-15 17:47 ` Mike Kravetz [this message]
2021-01-12 10:41 ` [RFC PATCH 0/3] create hugetlb flags to consolidate state David Hildenbrand
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