Re: kswapd @ 60-80% CPU during heavy HD i/o.

[Andrea Arcangeli <andrea@suse.de>]

On Tue, 2 May 2000, Rik van Riel wrote:

>That's a very bad idea.

However the lru_cache have definitely to be per-node and not global as now
in 2.3.99-pre6 and pre7-1 or you won't be able to do the smart things I
was mentining some day ago in linux-mm with NUMA.

My current tree looks like this:

#define LRU_SWAP_CACHE		0
#define LRU_NORMAL_CACHE	1
#define NR_LRU_CACHE		2
typedef struct lru_cache_s {
	struct list_head heads[NR_LRU_CACHE];
	unsigned long nr_cache_pages; /* pages in the lrus */
	unsigned long nr_map_pages; /* pages temporarly out of the lru */
	/* keep lock in a separate cacheline to avoid ping pong in SMP */
	spinlock_t lock ____cacheline_aligned_in_smp;
} lru_cache_t;

struct bootmem_data;
typedef struct pglist_data {
	int nr_zones;
	zone_t node_zones[MAX_NR_ZONES];
	gfpmask_zone_t node_gfpmask_zone[NR_GFPINDEX];
	lru_cache_t lru_cache;
	struct page *node_mem_map;
	unsigned long *valid_addr_bitmap;
	struct bootmem_data *bdata;
	unsigned long node_start_paddr;
	unsigned long node_start_mapnr;
	unsigned long node_size;
	int node_id;
	struct pglist_data *node_next;
	spinlock_t freelist_lock ____cacheline_aligned_in_smp;
} pg_data_t;

Stay tuned...

Andrea

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