From: arisawa <arisawa@ar.aichi-u.ac.jp>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] protection against resource exhaustion
Date: Wed, 28 Jan 2015 15:50:16 +0900 [thread overview]
Message-ID: <A97D4AC3-3160-448A-BAAE-562FD1529B6C@ar.aichi-u.ac.jp> (raw)
In-Reply-To: <1fccf1df5e46d5fa5235a40a90a001e3@brasstown.quanstro.net>
Hello,
> nonetheless, i have experience running multi-user plan 9 systems, and users
> were not usually the issue.
Eric’s users are all gentleman, all careful people and all skillful programmers.
If your system is served for university students, you will have different thought.
> i think you've turned a problem with bounded recovery time into a
> situation where the recovery code itself will inadvertently dos attack its
> users.
in case that a process failed in getting resource such as memory or process,
what it should do is very limited: puts out some message and exits.
this is right behavior.
I have never seen programs that retry malloc() or fork() until succeed.
if all processes retry them, the system will get down.
this is what I have observed in current plan9 kernel.
if any one has cleaner solution, i.e., a solution that never kill innocent process,
I want to see it.
next prev parent reply other threads:[~2015-01-28 6:50 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-25 6:16 arisawa
2015-01-25 6:59 ` mischief
2015-01-25 17:41 ` erik quanstrom
2015-01-26 11:47 ` arisawa
2015-01-26 12:46 ` cinap_lenrek
2015-01-26 14:13 ` erik quanstrom
2015-01-27 0:33 ` arisawa
2015-01-27 1:30 ` Lyndon Nerenberg
2015-01-27 4:13 ` erik quanstrom
2015-01-27 4:22 ` erik quanstrom
2015-01-27 7:03 ` arisawa
2015-01-27 7:10 ` Ori Bernstein
2015-01-27 7:15 ` lucio
2015-01-27 14:05 ` erik quanstrom
2015-01-27 7:12 ` lucio
2015-01-27 14:10 ` erik quanstrom
2015-01-28 0:10 ` arisawa
2015-01-28 3:38 ` erik quanstrom
2015-01-28 6:50 ` arisawa [this message]
2015-01-28 7:22 ` lucio
2015-01-28 7:48 ` Quintile
2015-01-28 13:13 ` cinap_lenrek
2015-01-28 14:03 ` erik quanstrom
2015-01-28 14:09 ` lucio
2015-01-28 14:14 ` erik quanstrom
2015-01-28 14:53 ` lucio
2015-01-28 17:02 ` Skip Tavakkolian
2015-01-28 14:16 ` erik quanstrom
2015-01-28 17:28 ` Charles Forsyth
2015-01-28 17:39 ` cinap_lenrek
2015-01-28 18:51 ` Charles Forsyth
2015-01-29 3:57 ` arisawa
2015-01-29 6:34 ` erik quanstrom
2015-01-29 6:42 ` erik quanstrom
2015-01-29 8:11 ` arisawa
2015-01-27 10:53 ` Charles Forsyth
2015-01-27 14:01 ` erik quanstrom
2015-01-25 9:04 ` arisawa
2015-01-25 11:06 ` Bence Fábián
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=A97D4AC3-3160-448A-BAAE-562FD1529B6C@ar.aichi-u.ac.jp \
--to=arisawa@ar.aichi-u.ac.jp \
--cc=9fans@9fans.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).