From: Baolin Wang <baolin.wang@linux.alibaba.com>
To: Mike Kravetz <mike.kravetz@oracle.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Cc: Muchun Song <songmuchun@bytedance.com>,
Michal Hocko <mhocko@suse.com>, Peter Xu <peterx@redhat.com>,
Naoya Horiguchi <naoya.horiguchi@linux.dev>,
James Houghton <jthoughton@google.com>,
Mina Almasry <almasrymina@google.com>,
"Aneesh Kumar K . V" <aneesh.kumar@linux.vnet.ibm.com>,
Anshuman Khandual <anshuman.khandual@arm.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC PATCH 2/3] hugetlb: do not update address in huge_pmd_unshare
Date: Mon, 30 May 2022 18:14:45 +0800 [thread overview]
Message-ID: <c9d0f1b9-dbc7-ddf2-18f9-2b1a991d4932@linux.alibaba.com> (raw)
In-Reply-To: <20220527225849.284839-3-mike.kravetz@oracle.com>
On 5/28/2022 6:58 AM, Mike Kravetz wrote:
> As an optimization for loops sequentially processing hugetlb address
> ranges, huge_pmd_unshare would update a passed address if it unshared a
> pmd. Updating a loop control variable outside the loop like this is
> generally a bad idea. These loops are now using hugetlb_mask_last_hp
> to optimize scanning when non-present ptes are discovered. The same
> can be done when huge_pmd_unshare returns 1 indicating a pmd was
> unshared.
>
> Remove address update from huge_pmd_unshare. Change the passed argument
> type and update all callers. In loops sequentially processing addresses
> use hugetlb_mask_last_hp to update address if pmd is unshared.
>
> Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
LGTM. Please feel free to add:
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
next prev parent reply other threads:[~2022-05-30 10:14 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-27 22:58 [RFC PATCH 0/3] hugetlb: speed up linear address scanning Mike Kravetz
2022-05-27 22:58 ` [RFC PATCH 1/3] hugetlb: skip to end of PT page mapping when pte not present Mike Kravetz
2022-05-30 10:10 ` Baolin Wang
2022-05-31 16:56 ` Mike Kravetz
2022-06-15 21:22 ` Mike Kravetz
2022-06-16 3:48 ` Baolin Wang
2022-05-30 19:56 ` Peter Xu
2022-05-31 2:04 ` Muchun Song
2022-05-31 17:05 ` Mike Kravetz
2022-06-01 6:58 ` Anshuman Khandual
2022-05-31 17:00 ` Mike Kravetz
2022-06-15 17:27 ` Mike Kravetz
2022-06-15 17:51 ` Peter Xu
2022-05-27 22:58 ` [RFC PATCH 2/3] hugetlb: do not update address in huge_pmd_unshare Mike Kravetz
2022-05-30 10:14 ` Baolin Wang [this message]
2022-05-30 15:36 ` Muchun Song
2022-05-31 17:06 ` Mike Kravetz
2022-05-27 22:58 ` [RFC PATCH 3/3] hugetlb: Lazy page table copies in fork() Mike Kravetz
2022-05-31 17:25 ` David Hildenbrand
2022-06-01 5:20 ` Muchun Song
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