linux-kernel - [HELP] How to get task

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Message-ID: <5cf71366-ba01-8ef0-3dbd-c9fec8a2b26f@linux.alibaba.com>
Date:   Thu, 30 May 2019 14:57:46 +0800
From:   Yang Shi <yang.shi@...ux.alibaba.com>
To:     Mel Gorman <mgorman@...hsingularity.net>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: [HELP] How to get task_struct from mm

Hi folks,

As what we discussed about page demotion for PMEM at LSF/MM, the 
demotion should respect to the mempolicy and allowed mems of the process 
which the page (anonymous page only for now) belongs to.

The vma that the page is mapped to can be retrieved from rmap walk 
easily, but we need know the task_struct that the vma belongs to. It 
looks there is not such API, and container_of seems not work with 
pointer member.

Any suggestion?

Thanks,

Yang