linux-kernel - Re: [PATCH v3 1/2] mm: introduce process

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Message-ID: <YP5wUxx/TflLP6dq@dhcp22.suse.cz>
Date:   Mon, 26 Jul 2021 10:20:35 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Suren Baghdasaryan <surenb@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Rientjes <rientjes@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Roman Gushchin <guro@...com>, Rik van Riel <riel@...riel.com>,
        Minchan Kim <minchan@...nel.org>,
        Christian Brauner <christian@...uner.io>,
        Christoph Hellwig <hch@...radead.org>,
        Oleg Nesterov <oleg@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Jann Horn <jannh@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Florian Weimer <fweimer@...hat.com>, jengelh@...i.de,
        Tim Murray <timmurray@...gle.com>,
        Linux API <linux-api@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-team <kernel-team@...roid.com>
Subject: Re: [PATCH v3 1/2] mm: introduce process_mrelease system call

On Thu 22-07-21 19:03:56, Shakeel Butt wrote:
> On Thu, Jul 22, 2021 at 6:14 PM Suren Baghdasaryan <surenb@...gle.com> wrote:
> >
> [...]
> > +
> > +       mmap_read_lock(mm);
> 
> How about mmap_read_trylock(mm) and return -EAGAIN on failure?

Btw. wether there is a non-blocking variant or not we should use
killable waiting to make sure the task calling into this is killable
by userspace (e.g. to implement a timeout based approach).
-- 
Michal Hocko
SUSE Labs