Messages in this thread | | | Date | Sat, 20 Sep 2008 12:55:46 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [patch 1/4] Make the per cpu reserve configurable |
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On Fri, 19 Sep 2008 07:59:00 -0700 Christoph Lameter <cl@linux-foundation.org> wrote: > +unsigned int percpu_reserve = PERCPU_MODULE_RESERVE; > +
Is this PERCPU_MODULE_RESERVE default size is fixex to 8192 bytes both on 32bit-arch and 64bit-arch ? How about enlarging this to twice on 64bit arch now ?
sorry for noise.
Thanks, -Kame
> +static int __init init_percpu_reserve(char *str) > +{ > + get_option(&str, &percpu_reserve); > + return 0; > +} > + > +early_param("percpu=", init_percpu_reserve); > + > /* > * Unknown boot options get handed to init, unless they look like > * failed parameters > @@ -397,6 +407,9 @@ static void __init setup_per_cpu_areas(v > > /* Copy section for each CPU (we discard the original) */ > size = ALIGN(PERCPU_ENOUGH_ROOM, PAGE_SIZE); > + printk(KERN_INFO "percpu area: %d bytes total, %d available.\n", > + size, size - (__per_cpu_end - __per_cpu_start)); > + > ptr = alloc_bootmem_pages(size * nr_possible_cpus); > > for_each_possible_cpu(i) { > Index: linux-2.6/Documentation/kernel-parameters.txt > =================================================================== > --- linux-2.6.orig/Documentation/kernel-parameters.txt 2008-09-16 18:14:59.000000000 -0700 > +++ linux-2.6/Documentation/kernel-parameters.txt 2008-09-16 18:20:08.000000000 -0700 > @@ -1643,6 +1643,13 @@ and is between 256 and 4096 characters. > Format: { 0 | 1 } > See arch/parisc/kernel/pdc_chassis.c > > + percpu= Configure the number of percpu bytes that can be > + dynamically allocated. This is used for per cpu > + variables of modules and other dynamic per cpu data > + structures. Creation of per cpu structures after boot > + may fail if this is set too low. > + Default is 8000 bytes. > + > pf. [PARIDE] > See Documentation/paride.txt. > > > -- > > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majordomo@kvack.org. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a> >
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