From: Muchun Song <muchun.song@linux.dev>
To: Miaohe Lin <linmiaohe@huawei.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
mike.kravetz@oracle.com, Muchun Song <songmuchun@bytedance.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 03/10] hugetlb: Use LIST_HEAD() to define a list head
Date: Sat, 27 Aug 2022 09:47:14 +0800 [thread overview]
Message-ID: <8D011A6F-F557-4519-852C-80BBDE53E630@linux.dev> (raw)
In-Reply-To: <20220826092422.39591-4-linmiaohe@huawei.com>
> On Aug 26, 2022, at 17:24, Miaohe Lin <linmiaohe@huawei.com> wrote:
>
> We can avoid unneeded WRITE_ONCE() overhead by using LIST_HEAD() to define
> a list head.
IIUC, the overhead doesn’t change. Right?
I’m fine with your changes.
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Thanks.
>
> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
> ---
> mm/hugetlb.c | 7 ++-----
> 1 file changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 24f580ddf130..b3e6592247a3 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -459,14 +459,12 @@ static int allocate_file_region_entries(struct resv_map *resv,
> int regions_needed)
> __must_hold(&resv->lock)
> {
> - struct list_head allocated_regions;
> + LIST_HEAD(allocated_regions);
> int to_allocate = 0, i = 0;
> struct file_region *trg = NULL, *rg = NULL;
>
> VM_BUG_ON(regions_needed < 0);
>
> - INIT_LIST_HEAD(&allocated_regions);
> -
> /*
> * Check for sufficient descriptors in the cache to accommodate
> * the number of in progress add operations plus regions_needed.
> @@ -2352,7 +2350,7 @@ struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
> static int gather_surplus_pages(struct hstate *h, long delta)
> __must_hold(&hugetlb_lock)
> {
> - struct list_head surplus_list;
> + LIST_HEAD(surplus_list);
> struct page *page, *tmp;
> int ret;
> long i;
> @@ -2367,7 +2365,6 @@ static int gather_surplus_pages(struct hstate *h, long delta)
> }
>
> allocated = 0;
> - INIT_LIST_HEAD(&surplus_list);
>
> ret = -ENOMEM;
> retry:
> --
> 2.23.0
>
>
next prev parent reply other threads:[~2022-08-27 1:47 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-26 9:24 [PATCH 00/10] A few cleanup patches for hugetlb Miaohe Lin
2022-08-26 9:24 ` [PATCH 01/10] hugetlb: make hugetlb_cma_check() static Miaohe Lin
2022-08-27 1:40 ` Muchun Song
2022-08-26 9:24 ` [PATCH 02/10] hugetlb: Use helper macro SZ_1K Miaohe Lin
2022-08-27 1:40 ` Muchun Song
2022-08-26 9:24 ` [PATCH 03/10] hugetlb: Use LIST_HEAD() to define a list head Miaohe Lin
2022-08-27 1:47 ` Muchun Song [this message]
2022-08-27 2:27 ` Miaohe Lin
2022-08-27 2:48 ` Muchun Song
2022-08-27 6:38 ` Miaohe Lin
2022-08-26 9:24 ` [PATCH 04/10] hugetlb: Use sizeof() to get the array size Miaohe Lin
2022-08-27 1:43 ` Muchun Song
2022-08-26 9:24 ` [PATCH 05/10] hugetlb: Use helper {huge_pte|pmd}_lock() Miaohe Lin
2022-08-27 1:48 ` Muchun Song
2022-08-26 9:24 ` [PATCH 06/10] hugetlb: pass NULL to kobj_to_hstate() if nid is unused Miaohe Lin
2022-08-27 1:49 ` Muchun Song
2022-08-26 9:24 ` [PATCH 07/10] hugetlb: kill hugetlbfs_pagecache_page() Miaohe Lin
2022-08-27 1:52 ` Muchun Song
2022-08-26 9:24 ` [PATCH 08/10] hugetlb: remove unneeded SetHPageVmemmapOptimized() Miaohe Lin
2022-08-27 1:35 ` Muchun Song
2022-08-27 2:18 ` Miaohe Lin
2022-08-27 2:56 ` Muchun Song
2022-08-26 9:24 ` [PATCH 09/10] hugetlb: remove meaningless BUG_ON(huge_pte_none()) Miaohe Lin
2022-08-27 2:03 ` Muchun Song
2022-08-26 9:24 ` [PATCH 10/10] hugetlb: make hugetlb selects SYSFS if !SYSCTL Miaohe Lin
2022-08-27 1:59 ` Muchun Song
2022-08-27 2:34 ` Miaohe Lin
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