linux-kernel - Re: [PATCH] mm: mlock: remove lru_add_drain

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Date:   Thu, 19 Oct 2017 12:46:50 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Minchan Kim <minchan@...nel.org>,
        Yisheng Xie <xieyisheng1@...wei.com>,
        Ingo Molnar <mingo@...nel.org>,
        Greg Thelen <gthelen@...gle.com>,
        Hugh Dickins <hughd@...gle.com>, Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: mlock: remove lru_add_drain_all()

> [...]
>>
>> Sorry for the confusion. I wanted to say that if the pages which are
>> being mlocked are on caches of remote cpus then lru_add_drain_all will
>> move them to their corresponding LRUs and then remaining functionality
>> of mlock will move them again from their evictable LRUs to unevictable
>> LRU.
>
> yes, but the point is that we are draining pages which might be not
> directly related to pages which _will_ be mlocked by the syscall. In
> fact those will stay on the cache. This is the primary reason why this
> draining doesn't make much sense.
>
> Or am I still misunderstanding what you are saying here?
>

lru_add_drain_all() will drain everything irrespective if those pages
are being mlocked or not.