[lkml]   [2020]   [Jan]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [RFC PATCH] mm: thp: grab the lock before manipulation defer list
On Fri, Jan 03, 2020 at 11:29:06AM -0800, David Rientjes wrote:
>On Fri, 3 Jan 2020, Wei Yang wrote:
>> As all the other places, we grab the lock before manipulate the defer list.
>> Current implementation may face a race condition.
>> Fixes: 87eaceb3faa5 ("mm: thp: make deferred split shrinker memcg aware")
>> Signed-off-by: Wei Yang <>
>> ---
>> I notice the difference during code reading and just confused about the
>> difference. No specific test is done since limited knowledge about cgroup.
>> Maybe I miss something important?
>The check for !list_empty(page_deferred_list(page)) must certainly be
>serialized with doing list_del_init(page_deferred_list(page)).

Hi David

Would you mind giving more information? You mean list_empty and list_del_init
is atomic?

Wei Yang
Help you, Help me

 \ /
  Last update: 2020-01-04 00:39    [W:0.156 / U:0.316 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site