Re: [RFC 2/2] signal: extend pidfd_send_signal() to allow expedited process killing

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To: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Subject: Re: [RFC 2/2] signal: extend pidfd_send_signal() to allow expedited process killing
From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Date: Thu, 11 Apr 2019 08:33:13 -0700
Cc: akpm@xxxxxxxxxxxxxxxxxxxx, mhocko@xxxxxxxx, rientjes@xxxxxxxxxx, yuzhoujian@xxxxxxxxxxxxxxx, jrdr.linux@xxxxxxxxx, guro@xxxxxx, hannes@xxxxxxxxxxx, penguin-kernel@xxxxxxxxxxxxxxxxxxx, ebiederm@xxxxxxxxxxxx, shakeelb@xxxxxxxxxx, christian@xxxxxxxxxx, minchan@xxxxxxxxxx, timmurray@xxxxxxxxxx, dancol@xxxxxxxxxx, joel@xxxxxxxxxxxxxxxxx, jannh@xxxxxxxxxx, linux-mm@xxxxxxxxx, lsf-pc@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, kernel-team@xxxxxxxxxxx
In-reply-to: <20190411014353.113252-3-surenb@google.com>
References: <20190411014353.113252-1-surenb@google.com> <20190411014353.113252-3-surenb@google.com>
User-agent: Mutt/1.9.2 (2017-12-15)

On Wed, Apr 10, 2019 at 06:43:53PM -0700, Suren Baghdasaryan wrote:
> Add new SS_EXPEDITE flag to be used when sending SIGKILL via
> pidfd_send_signal() syscall to allow expedited memory reclaim of the
> victim process. The usage of this flag is currently limited to SIGKILL
> signal and only to privileged users.

What is the downside of doing expedited memory reclaim?  ie why not do it
every time a process is going to die?

Follow-Ups:
- Re: [RFC 2/2] signal: extend pidfd_send_signal() to allow expedited process killing
  - From: Michal Hocko
- Re: [RFC 2/2] signal: extend pidfd_send_signal() to allow expedited process killing
  - From: Suren Baghdasaryan
- Re: [RFC 2/2] signal: extend pidfd_send_signal() to allow expedited process killing
  - From: Johannes Weiner

References:
- [RFC 0/2] opportunistic memory reclaim of a killed process
  - From: Suren Baghdasaryan
- [RFC 2/2] signal: extend pidfd_send_signal() to allow expedited process killing
  - From: Suren Baghdasaryan

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