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] [thread-next>] [day] [month] [year] [list]
Date:	Mon, 8 Dec 2014 11:05:15 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Lai Jiangshan <laijs@...fujitsu.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH wq/for-3.19 3/3] workqueue: dump workqueues on sysrq-t

On Mon, 8 Dec 2014 13:40:35 -0500 Tejun Heo <tj@...nel.org> wrote:

> Hello, Andrew.
> 
> On Mon, Dec 08, 2014 at 10:06:13AM -0800, Andrew Morton wrote:
> > sysrq-t already produces thousands of lines of output.  Maybe create a
> > new keycode for this?
> 
> Believe it or not, we already used up all alphanumerics if we count in
> the arch-specific ones.  Given that the workqueue information would
> primarily be useful in tracking down hangs and we'd want to see the
> dump of tasks in that case anyway, sysrq-t isn't a bad fit for
> appending workqueue dump.  If anybody has a better idea, I'm all ears.

Really.  Upper case?

> ...
> > > +static void pr_cont_pool_info(struct worker_pool *pool)
> > > +{
> > > +	if (pool->cpu >= 0)
> > > +		pr_cont(" cpu=%d", pool->cpu);
> > > +	else if (pool->node != NUMA_NO_NODE)
> > > +		pr_cont(" node=%d", pool->node);
> > > +
> > > +	if (pool->cpu < 0) {
> > > +		static char cpus_buf[PAGE_SIZE];
> > 
> > Ouch.  This could be [NR_CPUS + epsilon]?
> 
> It's bitmap mask printing so each char can show four cpus.  PAGE_SIZE
> should be enough for now but I think we need cpumask_prcont().

I'm not concerned about it being too small ;) Not many people have 16k
CPUs - can it be shrunk?  It's particularly gross when CONFIG_SMP=n!


--
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