Re: [PATCH RT 00/02] SLOB optimizations

Steven Rostedt
2005-12-20T16:40:06Z

On Tue, 2005-12-20 at 11:29 -0500, Steven Rostedt wrote:
> On Tue, 20 Dec 2005, Ingo Molnar wrote:
> > > Tests:
> > > =====
> >
> > could you also post the output of 'size mm/slob.o', with and without
> > these patches, with CONFIG_EMBEDDED and CONFIG_CC_OPTIMIZE_FOR_SIZE
> > enabled? (and with all debugging options disabled) Both the UP and the
> > SMP overhead would be interesting to see.
> >

> Well, there is definitely a hit there:

There's also crap that can be removed in my patch. Like I started a
cache_chain algorithm. For example by adding just:

#if 0
static void test_slob(slob_t *s)
{

[...]

}

void print_slobs(void)
{

[...]

}
#endif

I get:
rt:
size mm/slob.o
text data bss dec hex filename
1889 112 233 2234 8ba mm/slob.o

rt smp:
size mm/slob.o
text data bss dec hex filename
2135 120 233 2488 9b8 mm/slob.o

So, I probably need to add stuff for CONFIG_OPTIMIZE_FOR_SIZE.

-- Steve

>
> rt (slob new):
> size mm/slob.o
> text data bss dec hex filename
> 2051 112 233 2396 95c mm/slob.o
>
> without
> size mm/slob.o
> text data bss dec hex filename
> 1331 120 8 1459 5b3 mm/slob.o
>
> rt smp (slob new)
> size mm/slob.o
> text data bss dec hex filename
> 2297 120 233 2650 a5a mm/slob.o
>
> without
> size mm/slob.o
> text data bss dec hex filename
> 1573 140 8 1721 6b9 mm/slob.o
>
>
> So, should this be a third memory managment system? A fast_slob?
>
>
> Just for kicks here's slab.o:
>
> rt:
> size mm/slab.o
> text data bss dec hex filename
> 8896 556 144 9596 257c mm/slab.o
>
> rt smp:
> size mm/slab.o
> text data bss dec hex filename
> 9679 640 84 10403 28a3 mm/slab.o
>
> So there's still a great improvement on that (maybe not the bss though).
>
> -- Steve
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
--
Steven Rostedt
Senior Programmer
Kihon Technologies
(607)786-4830