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base/node / acpi: Change 'node_hmem_attrs' to 'access_coordinates' 

Dan Williams suggested changing the struct 'node_hmem_attrs' to
'access_coordinates' [1]. The struct is a container of r/w-latency and
r/w-bandwidth numbers. Moving forward, this container will also be used by
CXL to store the performance characteristics of each link hop in
the PCIE/CXL topology. So, where node_hmem_attrs is just the access
parameters of a memory-node, access_coordinates applies more broadly
to hardware topology characteristics. The observation is that seemed like
an exercise in having the application identify "where" it falls on a
spectrum of bandwidth and latency needs. For the tuple of
read/write-latency and read/write-bandwidth, "coordinates" is not a perfect
fit. Sometimes it is just conveying values in isolation and not a
"location" relative to other performance points, but in the end this data
is used to identify the performance operation point of a given memory-node.
[2]

Link: http://lore.kernel.org/r/64471313421f7_1b66294d5@dwillia2-xfh.jf.intel.com.notmuch/
Link: https://lore.kernel.org/linux-cxl/645e6215ee0de_1e6f2945e@dwillia2-xfh.jf.intel.com.notmuch/
Suggested-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/170319615734.2212653.15319394025985499185.stgit@djiang5-mobl3
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dave Jiang 2023-12-21 15:02:37 -07:00 committed by Dan Williams
parent 60e43fe528
commit 6a954e94d0
5 changed files with 35 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/acpi/numa/hmat.c
View File

@ -63,7 +63,7 @@ struct memory_target {
unsigned int memory_pxm;
unsigned int processor_pxm;
struct resource memregions;
struct node_hmem_attrs hmem_attrs[2];
struct access_coordinate coord[2];
struct list_head caches;
struct node_cache_attrs cache_attrs;
bool registered;
@ -228,24 +228,24 @@ static void hmat_update_target_access(struct memory_target *target,
{
switch (type) {
case ACPI_HMAT_ACCESS_LATENCY:
target->hmem_attrs[access].read_latency = value;
target->hmem_attrs[access].write_latency = value;
target->coord[access].read_latency = value;
target->coord[access].write_latency = value;
break;
case ACPI_HMAT_READ_LATENCY:
target->hmem_attrs[access].read_latency = value;
target->coord[access].read_latency = value;
break;
case ACPI_HMAT_WRITE_LATENCY:
target->hmem_attrs[access].write_latency = value;
target->coord[access].write_latency = value;
break;
case ACPI_HMAT_ACCESS_BANDWIDTH:
target->hmem_attrs[access].read_bandwidth = value;
target->hmem_attrs[access].write_bandwidth = value;
target->coord[access].read_bandwidth = value;
target->coord[access].write_bandwidth = value;
break;
case ACPI_HMAT_READ_BANDWIDTH:
target->hmem_attrs[access].read_bandwidth = value;
target->coord[access].read_bandwidth = value;
break;
case ACPI_HMAT_WRITE_BANDWIDTH:
target->hmem_attrs[access].write_bandwidth = value;
target->coord[access].write_bandwidth = value;
break;
default:
break;
@ -681,7 +681,7 @@ static void hmat_register_target_cache(struct memory_target *target)
static void hmat_register_target_perf(struct memory_target *target, int access)
{
unsigned mem_nid = pxm_to_node(target->memory_pxm);
node_set_perf_attrs(mem_nid, &target->hmem_attrs[access], access);
node_set_perf_attrs(mem_nid, &target->coord[access], access);
}
static void hmat_register_target_devices(struct memory_target *target)
@ -765,7 +765,7 @@ static int hmat_set_default_dram_perf(void)
int rc;
int nid, pxm;
struct memory_target *target;
struct node_hmem_attrs *attrs;
struct access_coordinate *attrs;
if (!default_dram_type)
return -EIO;
@ -775,7 +775,7 @@ static int hmat_set_default_dram_perf(void)
target = find_mem_target(pxm);
if (!target)
continue;
attrs = &target->hmem_attrs[1];
attrs = &target->coord[1];
rc = mt_set_default_dram_perf(nid, attrs, "ACPI HMAT");
if (rc)
return rc;
@ -789,7 +789,7 @@ static int hmat_calculate_adistance(struct notifier_block *self,
{
static DECLARE_BITMAP(p_nodes, MAX_NUMNODES);
struct memory_target *target;
struct node_hmem_attrs *perf;
struct access_coordinate *perf;
int *adist = data;
int pxm;
@ -802,7 +802,7 @@ static int hmat_calculate_adistance(struct notifier_block *self,
hmat_update_target_attrs(target, p_nodes, 1);
mutex_unlock(&target_lock);
perf = &target->hmem_attrs[1];
perf = &target->coord[1];
if (mt_perf_to_adistance(perf, adist))
return NOTIFY_OK;

12
drivers/base/node.c
View File

@ -74,14 +74,14 @@ static BIN_ATTR_RO(cpulist, CPULIST_FILE_MAX_BYTES);
* @dev: Device for this memory access class
* @list_node: List element in the node's access list
* @access: The access class rank
* @hmem_attrs: Heterogeneous memory performance attributes
* @coord: Heterogeneous memory performance coordinates
*/
struct node_access_nodes {
struct device dev;
struct list_head list_node;
unsigned int access;
#ifdef CONFIG_HMEM_REPORTING
struct node_hmem_attrs hmem_attrs;
struct access_coordinate coord;
#endif
};
#define to_access_nodes(dev) container_of(dev, struct node_access_nodes, dev)
@ -167,7 +167,7 @@ static ssize_t property##_show(struct device *dev, \
char *buf) \
{ \
return sysfs_emit(buf, "%u\n", \
to_access_nodes(dev)->hmem_attrs.property); \
to_access_nodes(dev)->coord.property); \
} \
static DEVICE_ATTR_RO(property)
@ -187,10 +187,10 @@ static struct attribute *access_attrs[] = {
/**
* node_set_perf_attrs - Set the performance values for given access class
* @nid: Node identifier to be set
* @hmem_attrs: Heterogeneous memory performance attributes
* @coord: Heterogeneous memory performance coordinates
* @access: The access class the for the given attributes
*/
void node_set_perf_attrs(unsigned int nid, struct node_hmem_attrs *hmem_attrs,
void node_set_perf_attrs(unsigned int nid, struct access_coordinate *coord,
unsigned int access)
{
struct node_access_nodes *c;
@ -205,7 +205,7 @@ void node_set_perf_attrs(unsigned int nid, struct node_hmem_attrs *hmem_attrs,
if (!c)
return;
c->hmem_attrs = *hmem_attrs;
c->coord = *coord;
for (i = 0; access_attrs[i] != NULL; i++) {
if (sysfs_add_file_to_group(&c->dev.kobj, access_attrs[i],
"initiators")) {

10
include/linux/memory-tiers.h
View File

@ -33,7 +33,7 @@ struct memory_dev_type {
struct kref kref;
};
struct node_hmem_attrs;
struct access_coordinate;
#ifdef CONFIG_NUMA
extern bool numa_demotion_enabled;
@ -45,9 +45,9 @@ void clear_node_memory_type(int node, struct memory_dev_type *memtype);
int register_mt_adistance_algorithm(struct notifier_block *nb);
int unregister_mt_adistance_algorithm(struct notifier_block *nb);
int mt_calc_adistance(int node, int *adist);
int mt_set_default_dram_perf(int nid, struct node_hmem_attrs *perf,
int mt_set_default_dram_perf(int nid, struct access_coordinate *perf,
const char *source);
int mt_perf_to_adistance(struct node_hmem_attrs *perf, int *adist);
int mt_perf_to_adistance(struct access_coordinate *perf, int *adist);
#ifdef CONFIG_MIGRATION
int next_demotion_node(int node);
void node_get_allowed_targets(pg_data_t *pgdat, nodemask_t *targets);
@ -126,13 +126,13 @@ static inline int mt_calc_adistance(int node, int *adist)
return NOTIFY_DONE;
}
static inline int mt_set_default_dram_perf(int nid, struct node_hmem_attrs *perf,
static inline int mt_set_default_dram_perf(int nid, struct access_coordinate *perf,
const char *source)
{
return -EIO;
}
static inline int mt_perf_to_adistance(struct node_hmem_attrs *perf, int *adist)
static inline int mt_perf_to_adistance(struct access_coordinate *perf, int *adist)
{
return -EIO;
}

8
include/linux/node.h
View File

@ -20,14 +20,14 @@
#include <linux/list.h>
/**
* struct node_hmem_attrs - heterogeneous memory performance attributes
* struct access_coordinate - generic performance coordinates container
*
* @read_bandwidth: Read bandwidth in MB/s
* @write_bandwidth: Write bandwidth in MB/s
* @read_latency: Read latency in nanoseconds
* @write_latency: Write latency in nanoseconds
*/
struct node_hmem_attrs {
struct access_coordinate {
unsigned int read_bandwidth;
unsigned int write_bandwidth;
unsigned int read_latency;
@ -65,7 +65,7 @@ struct node_cache_attrs {
#ifdef CONFIG_HMEM_REPORTING
void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs);
void node_set_perf_attrs(unsigned int nid, struct node_hmem_attrs *hmem_attrs,
void node_set_perf_attrs(unsigned int nid, struct access_coordinate *coord,
unsigned access);
#else
static inline void node_add_cache(unsigned int nid,
@ -74,7 +74,7 @@ static inline void node_add_cache(unsigned int nid,
}
static inline void node_set_perf_attrs(unsigned int nid,
struct node_hmem_attrs *hmem_attrs,
struct access_coordinate *coord,
unsigned access)
{
}

12
mm/memory-tiers.c
View File

@ -109,7 +109,7 @@ static struct demotion_nodes *node_demotion __read_mostly;
static BLOCKING_NOTIFIER_HEAD(mt_adistance_algorithms);
static bool default_dram_perf_error;
static struct node_hmem_attrs default_dram_perf;
static struct access_coordinate default_dram_perf;
static int default_dram_perf_ref_nid = NUMA_NO_NODE;
static const char *default_dram_perf_ref_source;
@ -601,15 +601,15 @@ void clear_node_memory_type(int node, struct memory_dev_type *memtype)
}
EXPORT_SYMBOL_GPL(clear_node_memory_type);
static void dump_hmem_attrs(struct node_hmem_attrs *attrs, const char *prefix)
static void dump_hmem_attrs(struct access_coordinate *coord, const char *prefix)
{
pr_info(
"%sread_latency: %u, write_latency: %u, read_bandwidth: %u, write_bandwidth: %u\n",
prefix, attrs->read_latency, attrs->write_latency,
attrs->read_bandwidth, attrs->write_bandwidth);
prefix, coord->read_latency, coord->write_latency,
coord->read_bandwidth, coord->write_bandwidth);
}
int mt_set_default_dram_perf(int nid, struct node_hmem_attrs *perf,
int mt_set_default_dram_perf(int nid, struct access_coordinate *perf,
const char *source)
{
int rc = 0;
@ -666,7 +666,7 @@ out:
return rc;
}
int mt_perf_to_adistance(struct node_hmem_attrs *perf, int *adist)
int mt_perf_to_adistance(struct access_coordinate *perf, int *adist)
{
if (default_dram_perf_error)
return -EIO;