On Tue, 2007-05-08 at 20:16 +0900, KAMEZAWA Hiroyuki wrote:
> Make zonelist creation policy selectable from sysctl/boot option v5.
>
> This patch makes NUMA's zonelist (of pgdat) order selectable.
> Available order are Default(automatic)/ Node-based / Zone-based.
>
> [Default Order]
> The kernel selects Node-based or Zone-based order automatically.
>
> [Node-based Order]
> This policy treats the locality of memory as the most important parameter.
> Zonelist order is created by each zone's locality. This means lower zones
> (ex. ZONE_DMA) can be used before higher zone (ex. ZONE_NORMAL) exhausion.
> IOW. ZONE_DMA will be in the middle of zonelist.
> current 2.6.21 kernel uses this.
>
> Pros.
> * A user can expect local memory as much as possible.
> Cons.
> * lower zone will be exhansted before higher zone. This may cause OOM_KILL.
>
> Maybe suitable if ZONE_DMA is relatively big and you never see OOM_KILL
> because of ZONE_DMA exhaution and you need the best locality.
>
> (example)
> assume 2 node NUMA. node(0) has ZONE_DMA/ZONE_NORMAL, node(1) has ZONE_NORMAL.
>
> *node(0)'s memory allocation order:
>
> node(0)'s NORMAL -> node(0)'s DMA -> node(1)'s NORMAL.
>
> *node(1)'s memory allocation order:
>
> node(1)'s NORMAL -> node(0)'s NORMAL -> node(0)'s DMA.
>
> [Zone-based order]
> This policy treats the zone type as the most important parameter.
> Zonelist order is created by zone-type order. This means lower zone
> never be used bofere higher zone exhaustion.
> IOW. ZONE_DMA will be always at the tail of zonelist.
>
> Pros.
> * OOM_KILL(bacause of lower zone) occurs only if the whole zones are exhausted.
> Cons.
> * memory locality may not be best.
>
> (example)
> assume 2 node NUMA. node(0) has ZONE_DMA/ZONE_NORMAL, node(1) has ZONE_NORMAL.
>
> *node(0)'s memory allocation order:
>
> node(0)'s NORMAL -> node(1)'s NORMAL -> node(0)'s DMA.
>
> *node(1)'s memory allocation order:
>
> node(1)'s NORMAL -> node(0)'s NORMAL -> node(0)'s DMA.
>
> bootoption "numa_zonelist_order=" and proc/sysctl is supporetd.
>
> command:
> %echo N > /proc/sys/vm/numa_zonelist_order
>
> Will rebuild zonelist in Node-based order.
>
> command:
> %echo Z > /proc/sys/vm/numa_zonelist_order
>
> Will rebuild zonelist in Zone-based order.
>
> Tested on ia64 2-Node NUMA. works well.
>
> Thanks to Lee Schermerhorn, he gives me much help and codes.
>
> Signed-Off-By: KAMEZAWA Hiroyuki <[email protected]>
Tested OK on my platform.
Acked-by: Lee Schermerhorn <[email protected]>
>
> ---
> include/linux/mmzone.h | 5 +
> kernel/sysctl.c | 9 ++
> mm/page_alloc.c | 217 ++++++++++++++++++++++++++++++++++++++++++++-----
> 3 files changed, 209 insertions(+), 22 deletions(-)
>
> Index: linux-2.6.21-mm1/kernel/sysctl.c
> ===================================================================
> --- linux-2.6.21-mm1.orig/kernel/sysctl.c
> +++ linux-2.6.21-mm1/kernel/sysctl.c
> @@ -891,6 +891,15 @@ static ctl_table vm_table[] = {
> .proc_handler = &proc_dointvec_jiffies,
> .strategy = &sysctl_jiffies,
> },
> + {
> + .ctl_name = CTL_UNNUMBERED,
> + .procname = "numa_zonelist_order",
> + .data = &numa_zonelist_order,
> + .maxlen = NUMA_ZONELIST_ORDER_LEN,
> + .mode = 0644,
> + .proc_handler = &numa_zonelist_order_handler,
> + .strategy = &sysctl_string,
> + },
> #endif
> #if defined(CONFIG_X86_32) || \
> (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
> Index: linux-2.6.21-mm1/mm/page_alloc.c
> ===================================================================
> --- linux-2.6.21-mm1.orig/mm/page_alloc.c
> +++ linux-2.6.21-mm1/mm/page_alloc.c
> @@ -2023,7 +2023,8 @@ void show_free_areas(void)
> * Add all populated zones of a node to the zonelist.
> */
> static int __meminit build_zonelists_node(pg_data_t *pgdat,
> - struct zonelist *zonelist, int nr_zones, enum zone_type zone_type)
> + struct zonelist *zonelist, int nr_zones,
> + enum zone_type zone_type)
> {
> struct zone *zone;
>
> @@ -2042,9 +2043,97 @@ static int __meminit build_zonelists_nod
> return nr_zones;
> }
>
> +
> +/*
> + * zonelist_order:
> + * 0 = automatic detection of better ordering.
> + * 1 = order by ([node] distance, -zonetype)
> + * 2 = order by (-zonetype, [node] distance)
> + *
> + * If not NUMA, ZONELIST_ORDER_ZONE and ZONELIST_ORDER_NODE will create
> + * the same zonelist. So only NUMA can configure this param.
> + */
> +#define ZONELIST_ORDER_DEFAULT 0
> +#define ZONELIST_ORDER_NODE 1
> +#define ZONELIST_ORDER_ZONE 2
> +
> +static int zonelist_order = ZONELIST_ORDER_DEFAULT;
> +static char zonelist_order_name[3][8] = {"Default", "Node", "Zone"};
> +
> +
> #ifdef CONFIG_NUMA
> +/* string for sysctl */
> +#define NUMA_ZONELIST_ORDER_LEN 16
> +char numa_zonelist_order[16] = "default";
> +
> +/*
> + * interface for configure zonelist ordering.
> + * command line option "numa_zonelist_order"
> + * = "[dD]efault - default, automatic configuration.
> + * = "[nN]ode - order by node locality, then by zone within node
> + * = "[zZ]one - order by zone, then by locality within zone
> + */
> +
> +static int __parse_numa_zonelist_order(char *s)
> +{
> + if (*s == 'd' || *s == 'D') {
> + zonelist_order = ZONELIST_ORDER_DEFAULT;
> + } else if (*s == 'n' || *s == 'N') {
> + zonelist_order = ZONELIST_ORDER_NODE;
> + } else if (*s == 'z' || *s == 'Z') {
> + zonelist_order = ZONELIST_ORDER_ZONE;
> + } else {
> + printk(KERN_WARNING
> + "Ignoring invalid numa_zonelist_order value: "
> + "%s\n", s);
> + return -EINVAL;
> + }
> + return 0;
> +}
> +
> +static __init int setup_numa_zonelist_order(char *s)
> +{
> + if (s)
> + return __parse_numa_zonelist_order(s);
> + return 0;
> +}
> +early_param("numa_zonelist_order", setup_numa_zonelist_order);
> +
> +/*
> + * sysctl handler for numa_zonelist_order
> + */
> +int numa_zonelist_order_handler(ctl_table *table, int write,
> + struct file *file, void __user *buffer, size_t *length,
> + loff_t *ppos)
> +{
> + char saved_string[NUMA_ZONELIST_ORDER_LEN];
> + int ret;
> +
> + if (write)
> + strncpy(saved_string, (char*)table->data,
> + NUMA_ZONELIST_ORDER_LEN);
> + ret = proc_dostring(table, write, file, buffer, length, ppos);
> + if (ret)
> + return ret;
> + if (write) {
> + int oldval = zonelist_order;
> + if (__parse_numa_zonelist_order((char*)table->data)) {
> + /*
> + * bogus value. restore saved string
> + */
> + strncpy((char*)table->data, saved_string,
> + NUMA_ZONELIST_ORDER_LEN);
> + zonelist_order = oldval;
> + } else if (oldval != zonelist_order)
> + build_all_zonelists();
> + }
> + return 0;
> +}
> +
> +
> #define MAX_NODE_LOAD (num_online_nodes())
> -static int __meminitdata node_load[MAX_NUMNODES];
> +static int node_load[MAX_NUMNODES];
> +
> /**
> * find_next_best_node - find the next node that should appear in a given node's fallback list
> * @node: node whose fallback list we're appending
> @@ -2059,7 +2148,7 @@ static int __meminitdata node_load[MAX_N
> * on them otherwise.
> * It returns -1 if no node is found.
> */
> -static int __meminit find_next_best_node(int node, nodemask_t *used_node_mask)
> +static int find_next_best_node(int node, nodemask_t *used_node_mask)
> {
> int n, val;
> int min_val = INT_MAX;
> @@ -2105,13 +2194,73 @@ static int __meminit find_next_best_node
> return best_node;
> }
>
> -static void __meminit build_zonelists(pg_data_t *pgdat)
> +
> +/*
> + * Build zonelists ordered by node and zones within node.
> + * This results in maximum locality--normal zone overflows into local
> + * DMA zone, if any--but risks exhausting DMA zone.
> + */
> +static void build_zonelists_in_node_order(pg_data_t *pgdat, int node)
> {
> - int j, node, local_node;
> enum zone_type i;
> - int prev_node, load;
> + int j;
> struct zonelist *zonelist;
> +
> + for (i = 0; i < MAX_NR_ZONES; i++) {
> + zonelist = pgdat->node_zonelists + i;
> + for (j = 0; zonelist->zones[j] != NULL; j++);
> +
> + j = build_zonelists_node(NODE_DATA(node), zonelist, j, i);
> + zonelist->zones[j] = NULL;
> + }
> +}
> +
> +/*
> + * Build zonelists ordered by zone and nodes within zones.
> + * This results in conserving DMA zone[s] until all Normal memory is
> + * exhausted, but results in overflowing to remote node while memory
> + * may still exist in local DMA zone.
> + */
> +static int node_order[MAX_NUMNODES];
> +
> +static void build_zonelists_in_zone_order(pg_data_t *pgdat, int nr_nodes)
> +{
> + enum zone_type i;
> + int pos, j, node;
> + int zone_type; /* needs to be signed */
> + struct zone *z;
> + struct zonelist *zonelist;
> +
> + for (i = 0; i < MAX_NR_ZONES; i++) {
> + zonelist = pgdat->node_zonelists + i;
> + pos = 0;
> + for (zone_type = i; zone_type >= 0; zone_type--) {
> + for (j = 0; j < nr_nodes; j++) {
> + node = node_order[j];
> + z = &NODE_DATA(node)->node_zones[zone_type];
> + if (populated_zone(z))
> + zonelist->zones[pos++] = z;
> + }
> + }
> + zonelist->zones[pos] = NULL;
> + }
> +}
> +
> +static int default_zonelist_order(void)
> +{
> + /* dummy, just select node order. */
> + return ZONELIST_ORDER_NODE;
> +}
> +
> +
> +
> +static void build_zonelists(pg_data_t *pgdat, int ordering)
> +{
> + int j, node, load;
> + enum zone_type i;
> nodemask_t used_mask;
> + int local_node, prev_node;
> + struct zonelist *zonelist;
>
> /* initialize zonelists */
> for (i = 0; i < MAX_NR_ZONES; i++) {
> @@ -2124,6 +2273,10 @@ static void __meminit build_zonelists(pg
> load = num_online_nodes();
> prev_node = local_node;
> nodes_clear(used_mask);
> +
> + memset(node_order, 0, sizeof(node_order));
> + j = 0;
> +
> while ((node = find_next_best_node(local_node, &used_mask)) >= 0) {
> int distance = node_distance(local_node, node);
>
> @@ -2139,18 +2292,20 @@ static void __meminit build_zonelists(pg
> * So adding penalty to the first node in same
> * distance group to make it round-robin.
> */
> -
> if (distance != node_distance(local_node, prev_node))
> - node_load[node] += load;
> + node_load[node] = load;
> +
> prev_node = node;
> load--;
> - for (i = 0; i < MAX_NR_ZONES; i++) {
> - zonelist = pgdat->node_zonelists + i;
> - for (j = 0; zonelist->zones[j] != NULL; j++);
> + if (ordering == ZONELIST_ORDER_NODE)
> + build_zonelists_in_node_order(pgdat, node);
> + else
> + node_order[j++] = node; /* remember order */
> + }
>
> - j = build_zonelists_node(NODE_DATA(node), zonelist, j, i);
> - zonelist->zones[j] = NULL;
> - }
> + if (ordering == ZONELIST_ORDER_ZONE) {
> + /* calculate node order -- i.e., DMA last! */
> + build_zonelists_in_zone_order(pgdat, j);
> }
> }
>
> @@ -2172,9 +2327,18 @@ static void __meminit build_zonelist_cac
> }
> }
>
> +
> #else /* CONFIG_NUMA */
>
> -static void __meminit build_zonelists(pg_data_t *pgdat)
> +static int default_zonelist_order(void)
> +{
> + return ZONELIST_ORDER_ZONE;
> +}
> +
> +/*
> + * order is ignored.
> + */
> +static void __meminit build_zonelists(pg_data_t *pgdat, int order)
> {
> int node, local_node;
> enum zone_type i,j;
> @@ -2221,26 +2385,33 @@ static void __meminit build_zonelist_cac
> #endif /* CONFIG_NUMA */
>
> /* return values int ....just for stop_machine_run() */
> -static int __meminit __build_all_zonelists(void *dummy)
> +static int __build_all_zonelists(void *dummy)
> {
> int nid;
> -
> + int order = *(int *)dummy;
> for_each_online_node(nid) {
> - build_zonelists(NODE_DATA(nid));
> + build_zonelists(NODE_DATA(nid), order);
> build_zonelist_cache(NODE_DATA(nid));
> }
> return 0;
> }
>
> -void __meminit build_all_zonelists(void)
> +void build_all_zonelists(void)
> {
> + int order;
> + if (zonelist_order == ZONELIST_ORDER_DEFAULT)
> + order = default_zonelist_order();
> + else
> + order = zonelist_order;
> +
> if (system_state == SYSTEM_BOOTING) {
> - __build_all_zonelists(NULL);
> + __build_all_zonelists(&order);
> cpuset_init_current_mems_allowed();
> } else {
> + memset(node_load, 0, sizeof(node_load));
> /* we have to stop all cpus to guaranntee there is no user
> of zonelist */
> - stop_machine_run(__build_all_zonelists, NULL, NR_CPUS);
> + stop_machine_run(__build_all_zonelists, &order, NR_CPUS);
> /* cpuset refresh routine should be here */
> }
> vm_total_pages = nr_free_pagecache_pages();
> @@ -2257,8 +2428,10 @@ void __meminit build_all_zonelists(void)
> else
> page_group_by_mobility_disabled = 0;
>
> - printk("Built %i zonelists, mobility grouping %s. Total pages: %ld\n",
> + printk("Built %i zonelists in %s order, mobility grouping %s."
> + "Total pages: %ld\n",
> num_online_nodes(),
> + zonelist_order_name[order],
> page_group_by_mobility_disabled ? "off" : "on",
> vm_total_pages);
> }
> Index: linux-2.6.21-mm1/include/linux/mmzone.h
> ===================================================================
> --- linux-2.6.21-mm1.orig/include/linux/mmzone.h
> +++ linux-2.6.21-mm1/include/linux/mmzone.h
> @@ -610,6 +610,11 @@ int sysctl_min_unmapped_ratio_sysctl_han
> int sysctl_min_slab_ratio_sysctl_handler(struct ctl_table *, int,
> struct file *, void __user *, size_t *, loff_t *);
>
> +extern int numa_zonelist_order_handler(struct ctl_table *, int,
> + struct file *, void __user *, size_t *, loff_t *);
> +extern char numa_zonelist_order[];
> +#define NUMA_ZONELIST_ORDER_LEN 16 /* string buffer size */
> +
> #include <linux/topology.h>
> /* Returns the number of the current Node. */
> #ifndef numa_node_id
>
-
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