On Thu, Aug 16, 2007 at 09:45:41AM +0200, Peter Zijlstra wrote:
...
> Index: linux-2.6/include/linux/backing-dev.h
> ===================================================================
> --- linux-2.6.orig/include/linux/backing-dev.h
> +++ linux-2.6/include/linux/backing-dev.h
...
> @@ -24,6 +26,12 @@ enum bdi_state {
>
> typedef int (congested_fn)(void *, int);
>
> +enum bdi_stat_item {
> + NR_BDI_STAT_ITEMS
> +};
enum numbering starts at 0, so NR_BDI_STAT_ITEMS == 0
> +
> +#define BDI_STAT_BATCH (8*(1+ilog2(nr_cpu_ids)))
> +
> struct backing_dev_info {
> unsigned long ra_pages; /* max readahead in PAGE_CACHE_SIZE units */
> unsigned long state; /* Always use atomic bitops on this */
> @@ -32,15 +40,86 @@ struct backing_dev_info {
> void *congested_data; /* Pointer to aux data for congested func */
> void (*unplug_io_fn)(struct backing_dev_info *, struct page *);
> void *unplug_io_data;
> +
> + struct percpu_counter bdi_stat[NR_BDI_STAT_ITEMS];
So, this is a 0-element array.
> };
>
> -static inline int bdi_init(struct backing_dev_info *bdi)
> +int bdi_init(struct backing_dev_info *bdi);
> +void bdi_destroy(struct backing_dev_info *bdi);
> +
> +static inline void __add_bdi_stat(struct backing_dev_info *bdi,
> + enum bdi_stat_item item, s64 amount)
> {
> - return 0;
> + __percpu_counter_add(&bdi->bdi_stat[item], amount, BDI_STAT_BATCH);
Boom!
> }
Josef 'Jeff' Sipek.
--
You measure democracy by the freedom it gives its dissidents, not the
freedom it gives its assimilated conformists.
- Abbie Hoffman
-
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]
