linux-kernel - Re: [PATCH 2/3] workqueues: microoptimize set_wq

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20100225135547.GA6062@redhat.com>
Date:	Thu, 25 Feb 2010 14:55:47 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tejun Heo <htejun@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Samu Onkalo <samu.p.onkalo@...ia.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] workqueues: microoptimize set_wq_data()

Hi,

On 02/25, Tejun Heo wrote:
>
> Hello, again.
>
> On 02/25/2010 12:10 PM, Tejun Heo wrote:
> >> @@ -220,12 +220,9 @@ struct cpu_workqueue_struct *wq_per_cpu(
> >>  static inline void set_wq_data(struct work_struct *work,
> >>  				struct cpu_workqueue_struct *cwq)
> >>  {
> >> -	unsigned long new;
> >> -
> >> -	BUG_ON(!work_pending(work));
> >> -
> >> -	new = (unsigned long) cwq | (1UL << WORK_STRUCT_PENDING);
> >> +	unsigned long new = (unsigned long)cwq;
> >>  	new |= WORK_STRUCT_FLAG_MASK & *work_data_bits(work);
> >> +	BUG_ON(!(new & (1UL << WORK_STRUCT_PENDING)));
> >>  	atomic_long_set(&work->data, new);
> >
> > Will apply under cmwq patches for the next merge window.
>
> Turns out I already have a patch which kills the second
> work_data_bits() dereferencing in the series.  The first one is now in
> the cmwq series which is about to be posted again.

OK, good.

Tejun, where can I find your cmwq patches? I'd like to take a look.

Thanks,

Oleg.

--
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/