On Thu, 11 Oct 2007 09:04:57 +0200 "Vegard Nossum" <[email protected]> wrote:
> > > - printk("Active:%lu inactive:%lu dirty:%lu writeback:%lu unstable:%lu\n"
> > > - " free:%lu slab:%lu mapped:%lu pagetables:%lu bounce:%lu\n",
> > > + printk("Active:%lu inactive:%lu dirty:%lu writeback:%lu unstable:%lu\n",
> > > global_page_state(NR_ACTIVE),
> > > global_page_state(NR_INACTIVE),
> > > global_page_state(NR_FILE_DIRTY),
> > > global_page_state(NR_WRITEBACK),
> > > - global_page_state(NR_UNSTABLE_NFS),
> > > + global_page_state(NR_UNSTABLE_NFS));
> > > + printk(" free:%lu slab:%lu mapped:%lu pagetables:%lu bounce:%lu\n",
> > > global_page_state(NR_FREE_PAGES),
> > > global_page_state(NR_SLAB_RECLAIMABLE) +
> > > global_page_state(NR_SLAB_UNRECLAIMABLE),
> >
> > I don't understand the reason for this change.
>
> I'm sorry :). It helps to make one line per call only, since this
> allows changing the printk internals for the better by reducing some
> complexity. I believe this is a good thing. I have a patch that
> changes printk, but it assumes that each format string only contains a
> single line. Is this a very bad assumption to make? Or maybe I should
> have sent that change first and made a reference to it?
>
> But don't you also agree, on the grounds of principle, that a single
> line per call is better style?
Well we do multiple-lines-per-printk in rather a lot of places and it has
two advantages:
- less text size (I expect)
- the printk is "atomic" in that the logically-connected output lines
won't get tangled up with an intervening printk from another CPU, or from
an interrupt handler on this CPU.
Those are pretty modest advantages and I guess we could live without them
if we got a significant gain from doing so. But it'd take quite some
effort hunting down all the callsites, and preventing new ones from
occuring.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
