lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:	Wed, 13 Jan 2010 22:57:16 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Alexander Shishkin <virtuoso@...nd.org>
Cc:	Valdis.Kletnieks@...edu, linux-fsdevel@...r.kernel.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCHv3] List per-process file descriptor consumption
	when hitting file-max

On Wed, Jan 13, 2010 at 10:44:59PM +0000, Al Viro wrote:
> On Mon, Jan 11, 2010 at 11:38:07AM +0200, Alexander Shishkin wrote:
> > When a file descriptor limit is hit, display the top consumers of
> > descriptors so that it is possible to identify and fix those which
> > leak them.
> > 
> > Two new sysctl tunables are introduced:
> >   * file-max-consumers -- number of processes to display (defaults
> >     to 10);
> >   * file-max-rate-limit -- time interval between subsequent dumps
> >     (defaults to 10 seconds).
> 
> That *still* doesn't answer the most important question: what for?

BTW, even leaving that (and obvious deadlocks) aside, this stuff is
monumentally bogus.  A process can easily have shitloads of opened
descriptors and very few opened files (see dup() and friends).  Conversely,
you can have shitloads of opened files and not a single opened descriptor
(see mmap()).  And you are calling that when we have too many opened
struct file.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ