linux-kernel - Re: [PATCH 10/10] mm: per device dirty threshold

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:	Sat, 21 Apr 2007 14:15:08 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	miklos@...redi.hu, neilb@...e.de, dgc@....com,
	tomoki.sekiyama.qu@...achi.com, nikita@...sterfs.com,
	trond.myklebust@....uio.no, yingchao.zhou@...il.com
Subject: Re: [PATCH 10/10] mm: per device dirty threshold


> > > +/*
> > > + * maximal error of a stat counter.
> > > + */
> > > +static inline unsigned long bdi_stat_delta(void)
> > > +{
> > > +#ifdef CONFIG_SMP
> > > +	return NR_CPUS * FBC_BATCH;
> > 
> > This is enormously wrong for CONFIG_NR_CPUS=1024 on a 2-way.

Right, I knew about that but, uhm.

I wanted to make that num_online_cpus(), and install a hotplug notifier
to fold the percpu delta back into the total on cpu offline.

But I have to look into doing that hotplug notifier stuff.

-
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/