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Implement memory and CPU hotplug

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ZFS currently doesn't react to hotplugging cpu or memory into the 
system in any way. This patch changes that by adding logic to the ARC 
that allows the system to take advantage of new memory that is added 
for caching purposes. It also adds logic to the taskq infrastructure 
to support dynamically expanding the number of threads allocated to a 
taskq.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Co-authored-by: Matthew Ahrens <matthew.ahrens@delphix.com>
Co-authored-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Paul Dagnelie <pcd@delphix.com>
Closes #11212
This commit is contained in:
Paul Dagnelie
2020-12-10 14:09:23 -08:00
committed by GitHub
parent f483daa870
commit 60a4c7d2a2
14 changed files with 290 additions and 36 deletions
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include/os/linux/spl/sys/taskq.h
+5
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@@ -84,6 +84,8 @@ typedef struct taskq {
int tq_nthreads; /* # of existing threads */
int tq_nspawn; /* # of threads being spawned */
int tq_maxthreads; /* # of threads maximum */
/* If PERCPU flag is set, percent of NCPUs to have as threads */
int tq_cpu_pct;
int tq_pri; /* priority */
int tq_minalloc; /* min taskq_ent_t pool size */
int tq_maxalloc; /* max taskq_ent_t pool size */
@@ -99,6 +101,9 @@ typedef struct taskq {
spl_wait_queue_head_t tq_work_waitq; /* new work waitq */
spl_wait_queue_head_t tq_wait_waitq; /* wait waitq */
tq_lock_role_t tq_lock_class; /* class when taking tq_lock */
/* list node for the cpu hotplug callback */
struct hlist_node tq_hp_cb_node;
boolean_t tq_hp_support;
} taskq_t;
typedef struct taskq_ent {
include/sys/arc.h
+1
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@@ -310,6 +310,7 @@ int arc_tempreserve_space(spa_t *spa, uint64_t reserve, uint64_t txg);
uint64_t arc_all_memory(void);
uint64_t arc_default_max(uint64_t min, uint64_t allmem);
uint64_t arc_target_bytes(void);
void arc_set_limits(uint64_t);
void arc_init(void);
void arc_fini(void);
include/sys/arc_impl.h
+2
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@@ -926,6 +926,8 @@ extern int arc_memory_throttle(spa_t *spa, uint64_t reserve, uint64_t txg);
extern uint64_t arc_free_memory(void);
extern int64_t arc_available_memory(void);
extern void arc_tuning_update(boolean_t);
extern void arc_register_hotplug(void);
extern void arc_unregister_hotplug(void);
extern int param_set_arc_long(ZFS_MODULE_PARAM_ARGS);
extern int param_set_arc_int(ZFS_MODULE_PARAM_ARGS);