github/ocf
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Align each global metadata lock to 64B

Browse Source 
.. in order to move primitives intended to be accessed
concurrently in separate CPU cache line.

Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
This commit is contained in:
Adam Rutkowski 2021-02-12 18:52:20 -06:00
parent 05780c98ed
commit 0748f33a9d
2 changed files with 16 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
src/concurrency/ocf_metadata_concurrency.c
View File

@ -24,7 +24,7 @@ int ocf_metadata_concurrency_init(struct ocf_metadata_lock *metadata_lock)
for (global_iter = 0; global_iter < OCF_NUM_GLOBAL_META_LOCKS;
global_iter++) {
err = env_rwsem_init(&metadata_lock->global[global_iter]);
err = env_rwsem_init(&metadata_lock->global[global_iter].sem);
if (err)
goto global_err;
}
@ -43,7 +43,7 @@ partition_err:
global_err:
while (global_iter--)
env_rwsem_destroy(&metadata_lock->global[global_iter]);
env_rwsem_destroy(&metadata_lock->global[global_iter].sem);
env_rwlock_destroy(&metadata_lock->status);
@ -65,7 +65,7 @@ void ocf_metadata_concurrency_deinit(struct ocf_metadata_lock *metadata_lock)
env_spinlock_destroy(&metadata_lock->eviction[i]);
for (i = 0; i < OCF_NUM_GLOBAL_META_LOCKS; i++)
env_rwsem_destroy(&metadata_lock->global[i]);
env_rwsem_destroy(&metadata_lock->global[i].sem);
env_rwlock_destroy(&metadata_lock->status);
}
@ -154,7 +154,7 @@ void ocf_metadata_start_exclusive_access(
unsigned i;
for (i = 0; i < OCF_NUM_GLOBAL_META_LOCKS; i++) {
env_rwsem_down_write(&metadata_lock->global[i]);
env_rwsem_down_write(&metadata_lock->global[i].sem);
}
}
@ -165,14 +165,14 @@ int ocf_metadata_try_start_exclusive_access(
int error;
for (i = 0; i < OCF_NUM_GLOBAL_META_LOCKS; i++) {
error = env_rwsem_down_write_trylock(&metadata_lock->global[i]);
error = env_rwsem_down_write_trylock(&metadata_lock->global[i].sem);
if (error)
break;
}
if (error) {
while (i--) {
env_rwsem_up_write(&metadata_lock->global[i]);
env_rwsem_up_write(&metadata_lock->global[i].sem);
}
}
@ -185,7 +185,7 @@ void ocf_metadata_end_exclusive_access(
unsigned i;
for (i = OCF_NUM_GLOBAL_META_LOCKS; i > 0; i--)
env_rwsem_up_write(&metadata_lock->global[i - 1]);
env_rwsem_up_write(&metadata_lock->global[i - 1].sem);
}
/* lock_idx determines which of underlying R/W locks is acquired for read. The goal
@ -199,20 +199,20 @@ void ocf_metadata_start_shared_access(
struct ocf_metadata_lock *metadata_lock,
unsigned lock_idx)
{
env_rwsem_down_read(&metadata_lock->global[lock_idx]);
env_rwsem_down_read(&metadata_lock->global[lock_idx].sem);
}
int ocf_metadata_try_start_shared_access(
struct ocf_metadata_lock *metadata_lock,
unsigned lock_idx)
{
return env_rwsem_down_read_trylock(&metadata_lock->global[lock_idx]);
return env_rwsem_down_read_trylock(&metadata_lock->global[lock_idx].sem);
}
void ocf_metadata_end_shared_access(struct ocf_metadata_lock *metadata_lock,
unsigned lock_idx)
{
env_rwsem_up_read(&metadata_lock->global[lock_idx]);
env_rwsem_up_read(&metadata_lock->global[lock_idx].sem);
}
/* NOTE: Calling 'naked' lock/unlock requires caller to hold global metadata

7
src/metadata/metadata_structs.h
View File

@ -47,9 +47,14 @@ struct ocf_cache_line_settings {
#define OCF_METADATA_GLOBAL_LOCK_IDX_BITS 2
#define OCF_NUM_GLOBAL_META_LOCKS (1 << (OCF_METADATA_GLOBAL_LOCK_IDX_BITS))
struct ocf_metadata_global_lock {
env_rwsem sem;
} __attribute__((aligned(64)));
struct ocf_metadata_lock
{
env_rwsem global[OCF_NUM_GLOBAL_META_LOCKS]; /*!< global metadata lock (GML) */
struct ocf_metadata_global_lock global[OCF_NUM_GLOBAL_META_LOCKS];
/*!< global metadata lock (GML) */
env_rwlock status; /*!< Fast lock for status bits */
env_spinlock eviction[OCF_NUM_EVICTION_LISTS]; /*!< Fast lock for eviction policy */
env_rwsem *hash; /*!< Hash bucket locks */