Re: [PATCH v2 4/6] mm: Only IPI CPUs to drain local pages if they exist

[Gilad Ben-Yossef]

On Fri, Oct 28, 2011 at 6:10 AM, Christoph Lameter <cl@xxxxxxxxxx> wrote:
> On Sun, 23 Oct 2011, Gilad Ben-Yossef wrote:
>
>> +/* Which CPUs have per cpu pages  */
>> +cpumask_var_t cpus_with_pcp;
>> +static DEFINE_PER_CPU(unsigned long, total_cpu_pcp_count);
>
> This increases the cache footprint of a hot vm path. Is it possible to do
> the same than what you did for slub? Run a loop over all zones when
> draining to check for remaining pcp pages and build the set of cpus
> needing IPIs temporarily while draining?
>

Sounds like a good idea. I will give it a shot.

Thanks,
Gilad




-- 
Gilad Ben-Yossef
Chief Coffee Drinker
gilad@xxxxxxxxxxxxx
Israel Cell: +972-52-8260388
US Cell: +1-973-8260388
http://benyossef.com

"I've seen things you people wouldn't believe. Goto statements used to
implement co-routines. I watched C structures being stored in
registers. All those moments will be lost in time... like tears in
rain... Time to die. "
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/