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Message-ID: <CALCETrWsVw4+jT_Z1uxidRAZ0SQbngYe7E2m-8iyX6qRbug6zA@mail.gmail.com>
Date: Wed, 30 Jun 2021 17:44:36 -0700
From: Andy Lutomirski <luto@...nel.org>
To: Johannes Weiner <hannes@...xchg.org>
Cc: Suren Baghdasaryan <surenb@...gle.com>,
Andy Lutomirski <luto@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Michal Hocko <mhocko@...nel.org>,
Michal Hocko <mhocko@...e.com>,
David Rientjes <rientjes@...gle.com>,
Matthew Wilcox <willy@...radead.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>,
Shakeel Butt <shakeelb@...gle.com>,
Tim Murray <timmurray@...gle.com>,
Linux API <linux-api@...r.kernel.org>,
Linux-MM <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>,
Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [PATCH 1/1] mm: introduce process_reap system call
On Wed, Jun 30, 2021 at 2:45 PM Johannes Weiner <hannes@...xchg.org> wrote:
>
> On Wed, Jun 30, 2021 at 11:51:36AM -0700, Suren Baghdasaryan wrote:
> > On Wed, Jun 30, 2021 at 11:26 AM Andy Lutomirski <luto@...nel.org> wrote:
> > > Also, please consider removing all mention of the word "reap" from the
> > > user API. For better or for worse, "reap" in UNIX refers to what
> > > happens when a dead task gets wait()ed. I sincerely wish I could go
> > > back in time and gently encourage whomever invented that particular
> > > abomination to change their mind, but my time machine doesn't work.
> >
> > I see. Thanks for the note. How about process_mem_release() and
> > replacing reap with release everywhere?
>
> I don't quite understand the objection. This syscall works on tasks
> that are at the end of their life, right? Isn't something like
> process_mreap() establishing exactly the mental link we want here?
> Release is less descriptive for what this thing is to be used for.
For better or for worse, "reap" means to make a zombie pid go away.
>From the description, this new operation takes a dying process (not
necessarily a zombie yet) and aggressively frees its memory. This is
a different optioneration.
How about "free_dying_process_memory"?
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