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Subject[PATCH v2 02/25] staging: lustre: libcfs: remove useless CPU partition code
Date
From: Dmitry Eremin <dmitry.eremin@intel.com>

* remove scratch buffer and mutex which guard it.
* remove global cpumask and spinlock which guard it.
* remove cpt_version for checking CPUs state change during setup
because of just disable CPUs state change during setup.
* remove whole global struct cfs_cpt_data cpt_data.
* remove few unused APIs.

Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-8703
Reviewed-on: https://review.whamcloud.com/23303
Reviewed-on: https://review.whamcloud.com/25048
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Doug Oucharek <dougso@me.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Olaf Weber <olaf@sgi.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
---
Changelog:

v1) Initial patch
v2) Rebased to handle recent cleanups in libcfs

.../lustre/include/linux/libcfs/libcfs_cpu.h | 32 ++----
drivers/staging/lustre/lnet/libcfs/libcfs_cpu.c | 115 +++------------------
2 files changed, 22 insertions(+), 125 deletions(-)

diff --git a/drivers/staging/lustre/include/linux/libcfs/libcfs_cpu.h b/drivers/staging/lustre/include/linux/libcfs/libcfs_cpu.h
index 2ad12a6..3626969 100644
--- a/drivers/staging/lustre/include/linux/libcfs/libcfs_cpu.h
+++ b/drivers/staging/lustre/include/linux/libcfs/libcfs_cpu.h
@@ -95,8 +95,6 @@ struct cfs_cpu_partition {
/** descriptor for CPU partitions */
struct cfs_cpt_table {
#ifdef CONFIG_SMP
- /* version, reserved for hotplug */
- unsigned int ctb_version;
/* spread rotor for NUMA allocator */
unsigned int ctb_spread_rotor;
/* # of CPU partitions */
@@ -176,12 +174,12 @@ struct cfs_cpt_table {
* return 1 if successfully set all CPUs, otherwise return 0
*/
int cfs_cpt_set_cpumask(struct cfs_cpt_table *cptab,
- int cpt, cpumask_t *mask);
+ int cpt, const cpumask_t *mask);
/**
* remove all cpus in \a mask from CPU partition \a cpt
*/
void cfs_cpt_unset_cpumask(struct cfs_cpt_table *cptab,
- int cpt, cpumask_t *mask);
+ int cpt, const cpumask_t *mask);
/**
* add all cpus in NUMA node \a node to CPU partition \a cpt
* return 1 if successfully set all CPUs, otherwise return 0
@@ -204,20 +202,11 @@ int cfs_cpt_set_nodemask(struct cfs_cpt_table *cptab,
void cfs_cpt_unset_nodemask(struct cfs_cpt_table *cptab,
int cpt, nodemask_t *mask);
/**
- * unset all cpus for CPU partition \a cpt
- */
-void cfs_cpt_clear(struct cfs_cpt_table *cptab, int cpt);
-/**
* convert partition id \a cpt to numa node id, if there are more than one
* nodes in this partition, it might return a different node id each time.
*/
int cfs_cpt_spread_node(struct cfs_cpt_table *cptab, int cpt);

-/**
- * return number of HTs in the same core of \a cpu
- */
-int cfs_cpu_ht_nsiblings(int cpu);
-
int cfs_cpu_init(void);
void cfs_cpu_fini(void);

@@ -304,13 +293,15 @@ static inline int cfs_cpt_table_print(struct cfs_cpt_table *cptab,
}

static inline int
-cfs_cpt_set_cpumask(struct cfs_cpt_table *cptab, int cpt, cpumask_t *mask)
+cfs_cpt_set_cpumask(struct cfs_cpt_table *cptab, int cpt,
+ const cpumask_t *mask)
{
return 1;
}

static inline void
-cfs_cpt_unset_cpumask(struct cfs_cpt_table *cptab, int cpt, cpumask_t *mask)
+cfs_cpt_unset_cpumask(struct cfs_cpt_table *cptab, int cpt,
+ const cpumask_t *mask)
{
}

@@ -336,11 +327,6 @@ static inline int cfs_cpt_table_print(struct cfs_cpt_table *cptab,
{
}

-static inline void
-cfs_cpt_clear(struct cfs_cpt_table *cptab, int cpt)
-{
-}
-
static inline int
cfs_cpt_spread_node(struct cfs_cpt_table *cptab, int cpt)
{
@@ -348,12 +334,6 @@ static inline int cfs_cpt_table_print(struct cfs_cpt_table *cptab,
}

static inline int
-cfs_cpu_ht_nsiblings(int cpu)
-{
- return 1;
-}
-
-static inline int
cfs_cpt_current(struct cfs_cpt_table *cptab, int remap)
{
return 0;
diff --git a/drivers/staging/lustre/lnet/libcfs/libcfs_cpu.c b/drivers/staging/lustre/lnet/libcfs/libcfs_cpu.c
index 803fc58..951a9ca 100644
--- a/drivers/staging/lustre/lnet/libcfs/libcfs_cpu.c
+++ b/drivers/staging/lustre/lnet/libcfs/libcfs_cpu.c
@@ -69,19 +69,6 @@
module_param(cpu_pattern, charp, 0444);
MODULE_PARM_DESC(cpu_pattern, "CPU partitions pattern");

-static struct cfs_cpt_data {
- /* serialize hotplug etc */
- spinlock_t cpt_lock;
- /* reserved for hotplug */
- unsigned long cpt_version;
- /* mutex to protect cpt_cpumask */
- struct mutex cpt_mutex;
- /* scratch buffer for set/unset_node */
- cpumask_var_t cpt_cpumask;
-} cpt_data;
-
-#define CFS_CPU_VERSION_MAGIC 0xbabecafe
-
struct cfs_cpt_table *
cfs_cpt_table_alloc(unsigned int ncpt)
{
@@ -124,11 +111,6 @@ struct cfs_cpt_table *
goto failed;
}

- spin_lock(&cpt_data.cpt_lock);
- /* Reserved for hotplug */
- cptab->ctb_version = cpt_data.cpt_version;
- spin_unlock(&cpt_data.cpt_lock);
-
return cptab;

failed:
@@ -203,17 +185,6 @@ struct cfs_cpt_table *
}
EXPORT_SYMBOL(cfs_cpt_table_print);

-static void
-cfs_node_to_cpumask(int node, cpumask_t *mask)
-{
- const cpumask_t *tmp = cpumask_of_node(node);
-
- if (tmp)
- cpumask_copy(mask, tmp);
- else
- cpumask_clear(mask);
-}
-
int
cfs_cpt_number(struct cfs_cpt_table *cptab)
{
@@ -366,7 +337,8 @@ struct cfs_cpt_table *
EXPORT_SYMBOL(cfs_cpt_unset_cpu);

int
-cfs_cpt_set_cpumask(struct cfs_cpt_table *cptab, int cpt, cpumask_t *mask)
+cfs_cpt_set_cpumask(struct cfs_cpt_table *cptab, int cpt,
+ const cpumask_t *mask)
{
int i;

@@ -387,7 +359,8 @@ struct cfs_cpt_table *
EXPORT_SYMBOL(cfs_cpt_set_cpumask);

void
-cfs_cpt_unset_cpumask(struct cfs_cpt_table *cptab, int cpt, cpumask_t *mask)
+cfs_cpt_unset_cpumask(struct cfs_cpt_table *cptab, int cpt,
+ const cpumask_t *mask)
{
int i;

@@ -399,7 +372,7 @@ struct cfs_cpt_table *
int
cfs_cpt_set_node(struct cfs_cpt_table *cptab, int cpt, int node)
{
- int rc;
+ const cpumask_t *mask;

if (node < 0 || node >= MAX_NUMNODES) {
CDEBUG(D_INFO,
@@ -407,34 +380,26 @@ struct cfs_cpt_table *
return 0;
}

- mutex_lock(&cpt_data.cpt_mutex);
-
- cfs_node_to_cpumask(node, cpt_data.cpt_cpumask);
-
- rc = cfs_cpt_set_cpumask(cptab, cpt, cpt_data.cpt_cpumask);
+ mask = cpumask_of_node(node);

- mutex_unlock(&cpt_data.cpt_mutex);
-
- return rc;
+ return cfs_cpt_set_cpumask(cptab, cpt, mask);
}
EXPORT_SYMBOL(cfs_cpt_set_node);

void
cfs_cpt_unset_node(struct cfs_cpt_table *cptab, int cpt, int node)
{
+ const cpumask_t *mask;
+
if (node < 0 || node >= MAX_NUMNODES) {
CDEBUG(D_INFO,
"Invalid NUMA id %d for CPU partition %d\n", node, cpt);
return;
}

- mutex_lock(&cpt_data.cpt_mutex);
-
- cfs_node_to_cpumask(node, cpt_data.cpt_cpumask);
-
- cfs_cpt_unset_cpumask(cptab, cpt, cpt_data.cpt_cpumask);
+ mask = cpumask_of_node(node);

- mutex_unlock(&cpt_data.cpt_mutex);
+ cfs_cpt_unset_cpumask(cptab, cpt, mask);
}
EXPORT_SYMBOL(cfs_cpt_unset_node);

@@ -462,26 +427,6 @@ struct cfs_cpt_table *
}
EXPORT_SYMBOL(cfs_cpt_unset_nodemask);

-void
-cfs_cpt_clear(struct cfs_cpt_table *cptab, int cpt)
-{
- int last;
- int i;
-
- if (cpt == CFS_CPT_ANY) {
- last = cptab->ctb_nparts - 1;
- cpt = 0;
- } else {
- last = cpt;
- }
-
- for (; cpt <= last; cpt++) {
- for_each_cpu(i, cptab->ctb_parts[cpt].cpt_cpumask)
- cfs_cpt_unset_cpu(cptab, cpt, i);
- }
-}
-EXPORT_SYMBOL(cfs_cpt_clear);
-
int
cfs_cpt_spread_node(struct cfs_cpt_table *cptab, int cpt)
{
@@ -754,7 +699,7 @@ struct cfs_cpt_table *
}

for_each_online_node(i) {
- cfs_node_to_cpumask(i, mask);
+ cpumask_copy(mask, cpumask_of_node(i));

while (!cpumask_empty(mask)) {
struct cfs_cpu_partition *part;
@@ -960,16 +905,8 @@ struct cfs_cpt_table *
#ifdef CONFIG_HOTPLUG_CPU
static enum cpuhp_state lustre_cpu_online;

-static void cfs_cpu_incr_cpt_version(void)
-{
- spin_lock(&cpt_data.cpt_lock);
- cpt_data.cpt_version++;
- spin_unlock(&cpt_data.cpt_lock);
-}
-
static int cfs_cpu_online(unsigned int cpu)
{
- cfs_cpu_incr_cpt_version();
return 0;
}

@@ -977,14 +914,9 @@ static int cfs_cpu_dead(unsigned int cpu)
{
bool warn;

- cfs_cpu_incr_cpt_version();
-
- mutex_lock(&cpt_data.cpt_mutex);
/* if all HTs in a core are offline, it may break affinity */
- cpumask_copy(cpt_data.cpt_cpumask, topology_sibling_cpumask(cpu));
- warn = cpumask_any_and(cpt_data.cpt_cpumask,
+ warn = cpumask_any_and(topology_sibling_cpumask(cpu),
cpu_online_mask) >= nr_cpu_ids;
- mutex_unlock(&cpt_data.cpt_mutex);
CDEBUG(warn ? D_WARNING : D_INFO,
"Lustre: can't support CPU plug-out well now, performance and stability could be impacted [CPU %u]\n",
cpu);
@@ -1003,7 +935,6 @@ static int cfs_cpu_dead(unsigned int cpu)
cpuhp_remove_state_nocalls(lustre_cpu_online);
cpuhp_remove_state_nocalls(CPUHP_LUSTRE_CFS_DEAD);
#endif
- free_cpumask_var(cpt_data.cpt_cpumask);
}

int
@@ -1013,16 +944,6 @@ static int cfs_cpu_dead(unsigned int cpu)

LASSERT(!cfs_cpt_tab);

- memset(&cpt_data, 0, sizeof(cpt_data));
-
- if (!zalloc_cpumask_var(&cpt_data.cpt_cpumask, GFP_NOFS)) {
- CERROR("Failed to allocate scratch buffer\n");
- return -1;
- }
-
- spin_lock_init(&cpt_data.cpt_lock);
- mutex_init(&cpt_data.cpt_mutex);
-
#ifdef CONFIG_HOTPLUG_CPU
ret = cpuhp_setup_state_nocalls(CPUHP_LUSTRE_CFS_DEAD,
"staging/lustre/cfe:dead", NULL,
@@ -1038,6 +959,7 @@ static int cfs_cpu_dead(unsigned int cpu)
#endif
ret = -EINVAL;

+ get_online_cpus();
if (*cpu_pattern) {
char *cpu_pattern_dup = kstrdup(cpu_pattern, GFP_KERNEL);

@@ -1063,13 +985,7 @@ static int cfs_cpu_dead(unsigned int cpu)
}
}

- spin_lock(&cpt_data.cpt_lock);
- if (cfs_cpt_tab->ctb_version != cpt_data.cpt_version) {
- spin_unlock(&cpt_data.cpt_lock);
- CERROR("CPU hotplug/unplug during setup\n");
- goto failed;
- }
- spin_unlock(&cpt_data.cpt_lock);
+ put_online_cpus();

LCONSOLE(0, "HW nodes: %d, HW CPU cores: %d, npartitions: %d\n",
num_online_nodes(), num_online_cpus(),
@@ -1077,6 +993,7 @@ static int cfs_cpu_dead(unsigned int cpu)
return 0;

failed:
+ put_online_cpus();
cfs_cpu_fini();
return ret;
}
--
1.8.3.1
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