[lkml]   [2021]   [Feb]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] mm/hugetlb: Remove redundant VM_BUG_ON_PAGE on putback_active_hugepage()
On 2/8/21 6:10 PM, Miaohe Lin wrote:
> Hi:
> On 2021/2/9 9:26, Mike Kravetz wrote:
>> On 2/8/21 12:37 AM, Miaohe Lin wrote:
>>> PageHead(page) is implicitly checked in set_page_huge_active() via the
>>> PageHeadHuge(page) check. So remove this explicit one.
>> I do not disagree with the code change. However, this commit message
>> is not accurate. set_page_huge_active() no longer exists in the tree
>> you are changing. It was replaced with SetHPageMigratable. Also, the
>> VM_BUG_ON_PAGE(!PageHeadHuge(page), page) was removed in the process.
>> So, there is no redundant check.
>> However, a quick audit of calling code reveals that all callers know they
>> are operating on a hugetlb head page.
> So I should change the commit log like:
> All callers know they are operating on a hugetlb head page. So this VM_BUG_ON_PAGE
> can't catch anything useful.
> and send a v2. Right?

Mike Kravetz

 \ /
  Last update: 2021-02-09 04:52    [W:0.085 / U:0.032 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site