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dm log userspace: split flush_entry_pool to be per dirty-log 

Use a single slab cache to allocate a mempool for each dirty-log.
This _should_ eliminate DM's need for io_schedule_timeout() in
mempool_alloc(); so io_schedule() should be sufficient now.

Also, rename struct flush_entry to dm_dirty_log_flush_entry to allow
KMEM_CACHE() to create a meaningful global name for the slab cache.

Also, eliminate some holes in struct log_c by rearranging members.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Heinz Mauelshagen <heinzm@redhat.com>
This commit is contained in:
Mike Snitzer 2015-02-12 15:20:35 -05:00
parent 851c9f38e4
commit ac1f9ef211
1 changed files with 45 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

84
drivers/md/dm-log-userspace-base.c
View File

@ -17,7 +17,9 @@
#define DM_LOG_USERSPACE_VSN "1.3.0"
struct flush_entry {
#define FLUSH_ENTRY_POOL_SIZE 16
struct dm_dirty_log_flush_entry {
int type;
region_t region;
struct list_head list;
@ -34,22 +36,14 @@ struct flush_entry {
struct log_c {
struct dm_target *ti;
struct dm_dev *log_dev;
uint32_t region_size;
region_t region_count;
uint64_t luid;
char uuid[DM_UUID_LEN];
char *usr_argv_str;
uint32_t usr_argc;
/*
* in_sync_hint gets set when doing is_remote_recovering. It
* represents the first region that needs recovery. IOW, the
* first zero bit of sync_bits. This can be useful for to limit
* traffic for calls like is_remote_recovering and get_resync_work,
* but be take care in its use for anything else.
*/
uint64_t in_sync_hint;
uint32_t region_size;
region_t region_count;
uint64_t luid;
char uuid[DM_UUID_LEN];
/*
* Mark and clear requests are held until a flush is issued
@ -61,6 +55,15 @@ struct log_c {
struct list_head mark_list;
struct list_head clear_list;
/*
* in_sync_hint gets set when doing is_remote_recovering. It
* represents the first region that needs recovery. IOW, the
* first zero bit of sync_bits. This can be useful for to limit
* traffic for calls like is_remote_recovering and get_resync_work,
* but be take care in its use for anything else.
*/
uint64_t in_sync_hint;
/*
* Workqueue for flush of clear region requests.
*/
@ -72,19 +75,11 @@ struct log_c {
* Combine userspace flush and mark requests for efficiency.
*/
uint32_t integrated_flush;
mempool_t *flush_entry_pool;
};
static mempool_t *flush_entry_pool;
static void *flush_entry_alloc(gfp_t gfp_mask, void *pool_data)
{
return kmalloc(sizeof(struct flush_entry), gfp_mask);
}
static void flush_entry_free(void *element, void *pool_data)
{
kfree(element);
}
static struct kmem_cache *_flush_entry_cache;
static int userspace_do_request(struct log_c *lc, const char *uuid,
int request_type, char *data, size_t data_size,
@ -254,6 +249,14 @@ static int userspace_ctr(struct dm_dirty_log *log, struct dm_target *ti,
goto out;
}
lc->flush_entry_pool = mempool_create_slab_pool(FLUSH_ENTRY_POOL_SIZE,
_flush_entry_cache);
if (!lc->flush_entry_pool) {
DMERR("Failed to create flush_entry_pool");
r = -ENOMEM;
goto out;
}
/*
* Send table string and get back any opened device.
*/
@ -310,6 +313,8 @@ static int userspace_ctr(struct dm_dirty_log *log, struct dm_target *ti,
out:
kfree(devices_rdata);
if (r) {
if (lc->flush_entry_pool)
mempool_destroy(lc->flush_entry_pool);
kfree(lc);
kfree(ctr_str);
} else {
@ -338,6 +343,8 @@ static void userspace_dtr(struct dm_dirty_log *log)
if (lc->log_dev)
dm_put_device(lc->ti, lc->log_dev);
mempool_destroy(lc->flush_entry_pool);
kfree(lc->usr_argv_str);
kfree(lc);
@ -461,7 +468,7 @@ static int userspace_in_sync(struct dm_dirty_log *log, region_t region,
static int flush_one_by_one(struct log_c *lc, struct list_head *flush_list)
{
int r = 0;
struct flush_entry *fe;
struct dm_dirty_log_flush_entry *fe;
list_for_each_entry(fe, flush_list, list) {
r = userspace_do_request(lc, lc->uuid, fe->type,
@ -481,7 +488,7 @@ static int flush_by_group(struct log_c *lc, struct list_head *flush_list,
int r = 0;
int count;
uint32_t type = 0;
struct flush_entry *fe, *tmp_fe;
struct dm_dirty_log_flush_entry *fe, *tmp_fe;
LIST_HEAD(tmp_list);
uint64_t group[MAX_FLUSH_GROUP_COUNT];
@ -563,7 +570,8 @@ static int userspace_flush(struct dm_dirty_log *log)
LIST_HEAD(clear_list);
int mark_list_is_empty;
int clear_list_is_empty;
struct flush_entry *fe, *tmp_fe;
struct dm_dirty_log_flush_entry *fe, *tmp_fe;
mempool_t *flush_entry_pool = lc->flush_entry_pool;
spin_lock_irqsave(&lc->flush_lock, flags);
list_splice_init(&lc->mark_list, &mark_list);
@ -643,10 +651,10 @@ static void userspace_mark_region(struct dm_dirty_log *log, region_t region)
{
unsigned long flags;
struct log_c *lc = log->context;
struct flush_entry *fe;
struct dm_dirty_log_flush_entry *fe;
/* Wait for an allocation, but _never_ fail */
fe = mempool_alloc(flush_entry_pool, GFP_NOIO);
fe = mempool_alloc(lc->flush_entry_pool, GFP_NOIO);
BUG_ON(!fe);
spin_lock_irqsave(&lc->flush_lock, flags);
@ -672,7 +680,7 @@ static void userspace_clear_region(struct dm_dirty_log *log, region_t region)
{
unsigned long flags;
struct log_c *lc = log->context;
struct flush_entry *fe;
struct dm_dirty_log_flush_entry *fe;
/*
* If we fail to allocate, we skip the clearing of
@ -680,7 +688,7 @@ static void userspace_clear_region(struct dm_dirty_log *log, region_t region)
* to cause the region to be resync'ed when the
* device is activated next time.
*/
fe = mempool_alloc(flush_entry_pool, GFP_ATOMIC);
fe = mempool_alloc(lc->flush_entry_pool, GFP_ATOMIC);
if (!fe) {
DMERR("Failed to allocate memory to clear region.");
return;
@ -886,18 +894,16 @@ static int __init userspace_dirty_log_init(void)
{
int r = 0;
flush_entry_pool = mempool_create(100, flush_entry_alloc,
flush_entry_free, NULL);
if (!flush_entry_pool) {
DMWARN("Unable to create flush_entry_pool: No memory.");
_flush_entry_cache = KMEM_CACHE(dm_dirty_log_flush_entry, 0);
if (!_flush_entry_cache) {
DMWARN("Unable to create flush_entry_cache: No memory.");
return -ENOMEM;
}
r = dm_ulog_tfr_init();
if (r) {
DMWARN("Unable to initialize userspace log communications");
mempool_destroy(flush_entry_pool);
kmem_cache_destroy(_flush_entry_cache);
return r;
}
@ -905,7 +911,7 @@ static int __init userspace_dirty_log_init(void)
if (r) {
DMWARN("Couldn't register userspace dirty log type");
dm_ulog_tfr_exit();
mempool_destroy(flush_entry_pool);
kmem_cache_destroy(_flush_entry_cache);
return r;
}
@ -917,7 +923,7 @@ static void __exit userspace_dirty_log_exit(void)
{
dm_dirty_log_type_unregister(&_userspace_type);
dm_ulog_tfr_exit();
mempool_destroy(flush_entry_pool);
kmem_cache_destroy(_flush_entry_cache);
DMINFO("version " DM_LOG_USERSPACE_VSN " unloaded");
return;