From: Dave Jones <davej@redhat.com>
To: Bodo Eggert <7eggert@gmx.de>
Cc: mingo@redhat.com, Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: Shrink the held_lock struct by using bitfields.
Date: Tue, 2 Jan 2007 20:06:31 -0500 [thread overview]
Message-ID: <20070103010631.GA11031@redhat.com> (raw)
In-Reply-To: <E1H1uI5-0000mn-0j@be1.lrz>
On Wed, Jan 03, 2007 at 01:47:36AM +0100, Bodo Eggert wrote:
> Dave Jones <davej@redhat.com> wrote:
>
> > Shrink the held_lock struct by using bitfields.
> > This shrinks task_struct on lockdep enabled kernels by 480 bytes.
>
> > * The following field is used to detect when we cross into an
> > * interrupt context:
> > */
> > - int irq_context;
> [...]
> > + unsigned char irq_context:1;
> [...]
>
> Can these fields be set by concurrent processes, e.g.:
> CPU0 CPU1
> load flags
> load flags
> flip bit
> store
> flip bit
> store
It's a per-process structure.
Dave
--
http://www.codemonkey.org.uk
next prev parent reply other threads:[~2007-01-03 1:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <7z1oG-6Jr-5@gated-at.bofh.it>
2007-01-03 0:47 ` Shrink the held_lock struct by using bitfields Bodo Eggert
2007-01-03 1:06 ` Dave Jones [this message]
2007-01-02 23:35 Dave Jones
2007-01-02 23:38 ` Dave Jones
2007-01-14 18:45 ` Ingo Molnar
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