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Enhance SPLAT kmem:slab_overcommit test 

After the emergency slab objects were merged I started observing
timeout failures in the kmem:slab_overcommit test.  These were
due to the ineffecient way the slab_overcommit reclaim function
was implemented.  And due to the additional cost of potentially
allocating ten of thousands of emergency objects and tracking
them on a single list.

This patch addresses the first concern by enhansing the test
case to trace all of the allocations objects as a linked list.
This allows for a cleaner version of the reclaim function to
simply release SPLAT_KMEM_OBJ_RECLAIM objects.

Since this touches some common code all the tests which share
these data structions were also updated.  After making these
changes slab_overcommit is reliably passing.  However, there
is certainly additional cleanup which could be done here.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf 2012-08-26 13:34:06 -07:00
parent cd5ca4b2f8
commit efcd0ca32d
1 changed files with 210 additions and 195 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

401
module/splat/splat-kmem.c
View File

@ -242,23 +242,22 @@ splat_kmem_test4(struct file *file, void *arg)
#define SPLAT_KMEM_TEST_MAGIC 0x004488CCUL #define SPLAT_KMEM_TEST_MAGIC 0x004488CCUL
#define SPLAT_KMEM_CACHE_NAME "kmem_test" #define SPLAT_KMEM_CACHE_NAME "kmem_test"
#define SPLAT_KMEM_OBJ_COUNT 1024 #define SPLAT_KMEM_OBJ_COUNT 1024
#define SPLAT_KMEM_OBJ_RECLAIM 20 /* percent */ #define SPLAT_KMEM_OBJ_RECLAIM 1000 /* objects */
#define SPLAT_KMEM_THREADS 32 #define SPLAT_KMEM_THREADS 32
#define KCP_FLAG_READY 0x01 #define KCP_FLAG_READY 0x01
typedef struct kmem_cache_data { typedef struct kmem_cache_data {
unsigned long kcd_magic; unsigned long kcd_magic;
struct list_head kcd_node;
int kcd_flag; int kcd_flag;
char kcd_buf[0]; char kcd_buf[0];
} kmem_cache_data_t; } kmem_cache_data_t;
typedef struct kmem_cache_thread { typedef struct kmem_cache_thread {
kmem_cache_t *kct_cache;
spinlock_t kct_lock; spinlock_t kct_lock;
int kct_id; int kct_id;
int kct_kcd_count; struct list_head kct_list;
kmem_cache_data_t *kct_kcd[0];
} kmem_cache_thread_t; } kmem_cache_thread_t;
typedef struct kmem_cache_priv { typedef struct kmem_cache_priv {
@ -276,18 +275,15 @@ typedef struct kmem_cache_priv {
int kcp_count; int kcp_count;
int kcp_alloc; int kcp_alloc;
int kcp_rc; int kcp_rc;
int kcp_kcd_count;
kmem_cache_data_t *kcp_kcd[0];
} kmem_cache_priv_t; } kmem_cache_priv_t;
static kmem_cache_priv_t * static kmem_cache_priv_t *
splat_kmem_cache_test_kcp_alloc(struct file *file, char *name, splat_kmem_cache_test_kcp_alloc(struct file *file, char *name,
int size, int align, int alloc, int count) int size, int align, int alloc)
{ {
kmem_cache_priv_t *kcp; kmem_cache_priv_t *kcp;
kcp = vmem_zalloc(sizeof(kmem_cache_priv_t) + kcp = kmem_zalloc(sizeof(kmem_cache_priv_t), KM_SLEEP);
count * sizeof(kmem_cache_data_t *), KM_SLEEP);
if (!kcp) if (!kcp)
return NULL; return NULL;
@ -304,7 +300,6 @@ splat_kmem_cache_test_kcp_alloc(struct file *file, char *name,
kcp->kcp_count = 0; kcp->kcp_count = 0;
kcp->kcp_alloc = alloc; kcp->kcp_alloc = alloc;
kcp->kcp_rc = 0; kcp->kcp_rc = 0;
kcp->kcp_kcd_count = count;
return kcp; return kcp;
} }
@ -312,34 +307,83 @@ splat_kmem_cache_test_kcp_alloc(struct file *file, char *name,
static void static void
splat_kmem_cache_test_kcp_free(kmem_cache_priv_t *kcp) splat_kmem_cache_test_kcp_free(kmem_cache_priv_t *kcp)
{ {
vmem_free(kcp, sizeof(kmem_cache_priv_t) + kmem_free(kcp, sizeof(kmem_cache_priv_t));
kcp->kcp_kcd_count * sizeof(kmem_cache_data_t *));
} }
static kmem_cache_thread_t * static kmem_cache_thread_t *
splat_kmem_cache_test_kct_alloc(int id, int count) splat_kmem_cache_test_kct_alloc(kmem_cache_priv_t *kcp, int id)
{ {
kmem_cache_thread_t *kct; kmem_cache_thread_t *kct;
ASSERTF(id < SPLAT_KMEM_THREADS, "id=%d\n", id); ASSERTF(id < SPLAT_KMEM_THREADS, "id=%d\n", id);
kct = vmem_zalloc(sizeof(kmem_cache_thread_t) + ASSERT(kcp->kcp_kct[id] == NULL);
count * sizeof(kmem_cache_data_t *), KM_SLEEP);
kct = kmem_zalloc(sizeof(kmem_cache_thread_t), KM_SLEEP);
if (!kct) if (!kct)
return NULL; return NULL;
spin_lock_init(&kct->kct_lock); spin_lock_init(&kct->kct_lock);
kct->kct_cache = NULL;
kct->kct_id = id; kct->kct_id = id;
kct->kct_kcd_count = count; INIT_LIST_HEAD(&kct->kct_list);
spin_lock(&kcp->kcp_lock);
kcp->kcp_kct[id] = kct;
spin_unlock(&kcp->kcp_lock);
return kct; return kct;
} }
static void static void
splat_kmem_cache_test_kct_free(kmem_cache_thread_t *kct) splat_kmem_cache_test_kct_free(kmem_cache_priv_t *kcp,
kmem_cache_thread_t *kct)
{ {
vmem_free(kct, sizeof(kmem_cache_thread_t) + spin_lock(&kcp->kcp_lock);
kct->kct_kcd_count * sizeof(kmem_cache_data_t *)); kcp->kcp_kct[kct->kct_id] = NULL;
spin_unlock(&kcp->kcp_lock);
kmem_free(kct, sizeof(kmem_cache_thread_t));
}
static void
splat_kmem_cache_test_kcd_free(kmem_cache_priv_t *kcp,
kmem_cache_thread_t *kct)
{
kmem_cache_data_t *kcd;
spin_lock(&kct->kct_lock);
while (!list_empty(&kct->kct_list)) {
kcd = list_entry(kct->kct_list.next,
kmem_cache_data_t, kcd_node);
list_del(&kcd->kcd_node);
spin_unlock(&kct->kct_lock);
kmem_cache_free(kcp->kcp_cache, kcd);
spin_lock(&kct->kct_lock);
}
spin_unlock(&kct->kct_lock);
}
static int
splat_kmem_cache_test_kcd_alloc(kmem_cache_priv_t *kcp,
kmem_cache_thread_t *kct, int count)
{
kmem_cache_data_t *kcd;
int i;
for (i = 0; i < count; i++) {
kcd = kmem_cache_alloc(kcp->kcp_cache, KM_SLEEP);
if (kcd == NULL) {
splat_kmem_cache_test_kcd_free(kcp, kct);
return -ENOMEM;
}
spin_lock(&kct->kct_lock);
list_add_tail(&kcd->kcd_node, &kct->kct_list);
spin_unlock(&kct->kct_lock);
}
return 0;
} }
static void static void
@ -372,6 +416,7 @@ splat_kmem_cache_test_constructor(void *ptr, void *priv, int flags)
if (kcd && kcp) { if (kcd && kcp) {
kcd->kcd_magic = kcp->kcp_magic; kcd->kcd_magic = kcp->kcp_magic;
INIT_LIST_HEAD(&kcd->kcd_node);
kcd->kcd_flag = 1; kcd->kcd_flag = 1;
memset(kcd->kcd_buf, 0xaa, kcp->kcp_size - (sizeof *kcd)); memset(kcd->kcd_buf, 0xaa, kcp->kcp_size - (sizeof *kcd));
kcp->kcp_count++; kcp->kcp_count++;
@ -406,51 +451,41 @@ splat_kmem_cache_test_reclaim(void *priv)
{ {
kmem_cache_priv_t *kcp = (kmem_cache_priv_t *)priv; kmem_cache_priv_t *kcp = (kmem_cache_priv_t *)priv;
kmem_cache_thread_t *kct; kmem_cache_thread_t *kct;
int i, j, count; kmem_cache_data_t *kcd;
LIST_HEAD(reclaim);
int i, count;
ASSERT(kcp->kcp_magic == SPLAT_KMEM_TEST_MAGIC); ASSERT(kcp->kcp_magic == SPLAT_KMEM_TEST_MAGIC);
count = kcp->kcp_kcd_count * SPLAT_KMEM_OBJ_RECLAIM / 100;
/* Objects directly attached to the kcp */ /* For each kct thread reclaim some objects */
spin_lock(&kcp->kcp_lock);
for (i = 0; i < kcp->kcp_kcd_count; i++) {
if (kcp->kcp_kcd[i]) {
kmem_cache_free(kcp->kcp_cache, kcp->kcp_kcd[i]);
kcp->kcp_kcd[i] = NULL;
if ((--count) == 0)
break;
}
}
spin_unlock(&kcp->kcp_lock);
/* No threads containing objects to consider */
if (kcp->kcp_kct_count == -1)
return;
/* Objects attached to a kct thread */
for (i = 0; i < kcp->kcp_kct_count; i++) {
spin_lock(&kcp->kcp_lock); spin_lock(&kcp->kcp_lock);
for (i = 0; i < SPLAT_KMEM_THREADS; i++) {
kct = kcp->kcp_kct[i]; kct = kcp->kcp_kct[i];
if (!kct) { if (!kct)
spin_unlock(&kcp->kcp_lock);
continue; continue;
}
spin_lock(&kct->kct_lock);
count = kct->kct_kcd_count * SPLAT_KMEM_OBJ_RECLAIM / 100;
for (j = 0; j < kct->kct_kcd_count; j++) {
if (kct->kct_kcd[j]) {
kmem_cache_free(kcp->kcp_cache,kct->kct_kcd[j]);
kct->kct_kcd[j] = NULL;
if ((--count) == 0)
break;
}
}
spin_unlock(&kct->kct_lock);
spin_unlock(&kcp->kcp_lock); spin_unlock(&kcp->kcp_lock);
spin_lock(&kct->kct_lock);
count = SPLAT_KMEM_OBJ_RECLAIM;
while (count > 0 && !list_empty(&kct->kct_list)) {
kcd = list_entry(kct->kct_list.next,
kmem_cache_data_t, kcd_node);
list_del(&kcd->kcd_node);
list_add(&kcd->kcd_node, &reclaim);
count--;
}
spin_unlock(&kct->kct_lock);
spin_lock(&kcp->kcp_lock);
}
spin_unlock(&kcp->kcp_lock);
/* Freed outside the spin lock */
while (!list_empty(&reclaim)) {
kcd = list_entry(reclaim.next, kmem_cache_data_t, kcd_node);
list_del(&kcd->kcd_node);
kmem_cache_free(kcp->kcp_cache, kcd);
} }
return; return;
@ -485,8 +520,7 @@ splat_kmem_cache_test_thread(void *arg)
{ {
kmem_cache_priv_t *kcp = (kmem_cache_priv_t *)arg; kmem_cache_priv_t *kcp = (kmem_cache_priv_t *)arg;
kmem_cache_thread_t *kct; kmem_cache_thread_t *kct;
int rc = 0, id, i; int rc = 0, id;
void *obj;
ASSERT(kcp->kcp_magic == SPLAT_KMEM_TEST_MAGIC); ASSERT(kcp->kcp_magic == SPLAT_KMEM_TEST_MAGIC);
@ -499,16 +533,12 @@ splat_kmem_cache_test_thread(void *arg)
kcp->kcp_kct_count++; kcp->kcp_kct_count++;
spin_unlock(&kcp->kcp_lock); spin_unlock(&kcp->kcp_lock);
kct = splat_kmem_cache_test_kct_alloc(id, kcp->kcp_alloc); kct = splat_kmem_cache_test_kct_alloc(kcp, id);
if (!kct) { if (!kct) {
rc = -ENOMEM; rc = -ENOMEM;
goto out; goto out;
} }
spin_lock(&kcp->kcp_lock);
kcp->kcp_kct[id] = kct;
spin_unlock(&kcp->kcp_lock);
/* Wait for all threads to have started and report they are ready */ /* Wait for all threads to have started and report they are ready */
if (kcp->kcp_kct_count == SPLAT_KMEM_THREADS) if (kcp->kcp_kct_count == SPLAT_KMEM_THREADS)
wake_up(&kcp->kcp_ctl_waitq); wake_up(&kcp->kcp_ctl_waitq);
@ -516,34 +546,14 @@ splat_kmem_cache_test_thread(void *arg)
wait_event(kcp->kcp_thr_waitq, wait_event(kcp->kcp_thr_waitq,
splat_kmem_cache_test_flags(kcp, KCP_FLAG_READY)); splat_kmem_cache_test_flags(kcp, KCP_FLAG_READY));
/* /* Create and destroy objects */
* Updates to kct->kct_kcd[] are performed under a spin_lock so rc = splat_kmem_cache_test_kcd_alloc(kcp, kct, kcp->kcp_alloc);
* they may safely run concurrent with the reclaim function. If splat_kmem_cache_test_kcd_free(kcp, kct);
* we are not in a low memory situation we have one lock per-
* thread so they are not expected to be contended.
*/
for (i = 0; i < kct->kct_kcd_count; i++) {
obj = kmem_cache_alloc(kcp->kcp_cache, KM_SLEEP);
spin_lock(&kct->kct_lock);
kct->kct_kcd[i] = obj;
spin_unlock(&kct->kct_lock);
}
for (i = 0; i < kct->kct_kcd_count; i++) {
spin_lock(&kct->kct_lock);
if (kct->kct_kcd[i]) {
kmem_cache_free(kcp->kcp_cache, kct->kct_kcd[i]);
kct->kct_kcd[i] = NULL;
}
spin_unlock(&kct->kct_lock);
}
out: out:
spin_lock(&kcp->kcp_lock); if (kct)
if (kct) { splat_kmem_cache_test_kct_free(kcp, kct);
splat_kmem_cache_test_kct_free(kct);
kcp->kcp_kct[id] = kct = NULL;
}
spin_lock(&kcp->kcp_lock);
if (!kcp->kcp_rc) if (!kcp->kcp_rc)
kcp->kcp_rc = rc; kcp->kcp_rc = rc;
@ -560,16 +570,15 @@ splat_kmem_cache_test(struct file *file, void *arg, char *name,
int size, int align, int flags) int size, int align, int flags)
{ {
kmem_cache_priv_t *kcp; kmem_cache_priv_t *kcp;
kmem_cache_data_t *kcd; kmem_cache_data_t *kcd = NULL;
int rc = 0, max; int rc = 0, max;
kcp = splat_kmem_cache_test_kcp_alloc(file, name, size, align, 0, 1); kcp = splat_kmem_cache_test_kcp_alloc(file, name, size, align, 0);
if (!kcp) { if (!kcp) {
splat_vprint(file, name, "Unable to create '%s'\n", "kcp"); splat_vprint(file, name, "Unable to create '%s'\n", "kcp");
return -ENOMEM; return -ENOMEM;
} }
kcp->kcp_kcd[0] = NULL;
kcp->kcp_cache = kcp->kcp_cache =
kmem_cache_create(SPLAT_KMEM_CACHE_NAME, kmem_cache_create(SPLAT_KMEM_CACHE_NAME,
kcp->kcp_size, kcp->kcp_align, kcp->kcp_size, kcp->kcp_align,
@ -592,11 +601,8 @@ splat_kmem_cache_test(struct file *file, void *arg, char *name,
rc = -EINVAL; rc = -EINVAL;
goto out_free; goto out_free;
} }
spin_lock(&kcp->kcp_lock);
kcp->kcp_kcd[0] = kcd;
spin_unlock(&kcp->kcp_lock);
if (!kcp->kcp_kcd[0]->kcd_flag) { if (!kcd->kcd_flag) {
splat_vprint(file, name, splat_vprint(file, name,
"Failed to run contructor for '%s'\n", "Failed to run contructor for '%s'\n",
SPLAT_KMEM_CACHE_NAME); SPLAT_KMEM_CACHE_NAME);
@ -604,7 +610,7 @@ splat_kmem_cache_test(struct file *file, void *arg, char *name,
goto out_free; goto out_free;
} }
if (kcp->kcp_kcd[0]->kcd_magic != kcp->kcp_magic) { if (kcd->kcd_magic != kcp->kcp_magic) {
splat_vprint(file, name, splat_vprint(file, name,
"Failed to pass private data to constructor " "Failed to pass private data to constructor "
"for '%s'\n", SPLAT_KMEM_CACHE_NAME); "for '%s'\n", SPLAT_KMEM_CACHE_NAME);
@ -613,10 +619,7 @@ splat_kmem_cache_test(struct file *file, void *arg, char *name,
} }
max = kcp->kcp_count; max = kcp->kcp_count;
spin_lock(&kcp->kcp_lock); kmem_cache_free(kcp->kcp_cache, kcd);
kmem_cache_free(kcp->kcp_cache, kcp->kcp_kcd[0]);
kcp->kcp_kcd[0] = NULL;
spin_unlock(&kcp->kcp_lock);
/* Destroy the entire cache which will force destructors to /* Destroy the entire cache which will force destructors to
* run and we can verify one was called for every object */ * run and we can verify one was called for every object */
@ -636,12 +639,8 @@ splat_kmem_cache_test(struct file *file, void *arg, char *name,
return rc; return rc;
out_free: out_free:
if (kcp->kcp_kcd[0]) { if (kcd)
spin_lock(&kcp->kcp_lock); kmem_cache_free(kcp->kcp_cache, kcd);
kmem_cache_free(kcp->kcp_cache, kcp->kcp_kcd[0]);
kcp->kcp_kcd[0] = NULL;
spin_unlock(&kcp->kcp_lock);
}
if (kcp->kcp_cache) if (kcp->kcp_cache)
kmem_cache_destroy(kcp->kcp_cache); kmem_cache_destroy(kcp->kcp_cache);
@ -661,7 +660,7 @@ splat_kmem_cache_thread_test(struct file *file, void *arg, char *name,
char cache_name[32]; char cache_name[32];
int i, rc = 0; int i, rc = 0;
kcp = splat_kmem_cache_test_kcp_alloc(file, name, size, 0, alloc, 0); kcp = splat_kmem_cache_test_kcp_alloc(file, name, size, 0, alloc);
if (!kcp) { if (!kcp) {
splat_vprint(file, name, "Unable to create '%s'\n", "kcp"); splat_vprint(file, name, "Unable to create '%s'\n", "kcp");
return -ENOMEM; return -ENOMEM;
@ -755,7 +754,9 @@ splat_kmem_test5(struct file *file, void *arg)
return splat_kmem_cache_test(file, arg, name, 128, 0, KMC_VMEM); return splat_kmem_cache_test(file, arg, name, 128, 0, KMC_VMEM);
} }
/* Validate large object cache behavior for dynamic/kmem/vmem caches */ /*
* Validate large object cache behavior for dynamic/kmem/vmem caches
*/
static int static int
splat_kmem_test6(struct file *file, void *arg) splat_kmem_test6(struct file *file, void *arg)
{ {
@ -773,7 +774,9 @@ splat_kmem_test6(struct file *file, void *arg)
return splat_kmem_cache_test(file, arg, name, 1024*1024, 0, KMC_VMEM); return splat_kmem_cache_test(file, arg, name, 1024*1024, 0, KMC_VMEM);
} }
/* Validate object alignment cache behavior for caches */ /*
* Validate object alignment cache behavior for caches
*/
static int static int
splat_kmem_test7(struct file *file, void *arg) splat_kmem_test7(struct file *file, void *arg)
{ {
@ -789,19 +792,31 @@ splat_kmem_test7(struct file *file, void *arg)
return rc; return rc;
} }
/*
* Validate kmem_cache_reap() by requesting the slab cache free any objects
* it can. For a few reasons this may not immediately result in more free
* memory even if objects are freed. First off, due to fragmentation we
* may not be able to reclaim any slabs. Secondly, even if we do we fully
* clear some slabs we will not want to immediately reclaim all of them
* because we may contend with cache allocations and thrash. What we want
* to see is the slab size decrease more gradually as it becomes clear they
* will not be needed. This should be achievable in less than a minute.
* If it takes longer than this something has gone wrong.
*/
static int static int
splat_kmem_test8(struct file *file, void *arg) splat_kmem_test8(struct file *file, void *arg)
{ {
kmem_cache_priv_t *kcp; kmem_cache_priv_t *kcp;
kmem_cache_data_t *kcd; kmem_cache_thread_t *kct;
int i, rc = 0; int i, rc = 0;
kcp = splat_kmem_cache_test_kcp_alloc(file, SPLAT_KMEM_TEST8_NAME, kcp = splat_kmem_cache_test_kcp_alloc(file, SPLAT_KMEM_TEST8_NAME,
256, 0, 0, SPLAT_KMEM_OBJ_COUNT); 256, 0, 0);
if (!kcp) { if (!kcp) {
splat_vprint(file, SPLAT_KMEM_TEST8_NAME, splat_vprint(file, SPLAT_KMEM_TEST8_NAME,
"Unable to create '%s'\n", "kcp"); "Unable to create '%s'\n", "kcp");
return -ENOMEM; rc = -ENOMEM;
goto out;
} }
kcp->kcp_cache = kcp->kcp_cache =
@ -811,34 +826,27 @@ splat_kmem_test8(struct file *file, void *arg)
splat_kmem_cache_test_reclaim, splat_kmem_cache_test_reclaim,
kcp, NULL, 0); kcp, NULL, 0);
if (!kcp->kcp_cache) { if (!kcp->kcp_cache) {
splat_kmem_cache_test_kcp_free(kcp);
splat_vprint(file, SPLAT_KMEM_TEST8_NAME, splat_vprint(file, SPLAT_KMEM_TEST8_NAME,
"Unable to create '%s'\n", SPLAT_KMEM_CACHE_NAME); "Unable to create '%s'\n", SPLAT_KMEM_CACHE_NAME);
return -ENOMEM; rc = -ENOMEM;
goto out_kcp;
} }
for (i = 0; i < SPLAT_KMEM_OBJ_COUNT; i++) { kct = splat_kmem_cache_test_kct_alloc(kcp, 0);
kcd = kmem_cache_alloc(kcp->kcp_cache, KM_SLEEP); if (!kct) {
spin_lock(&kcp->kcp_lock);
kcp->kcp_kcd[i] = kcd;
spin_unlock(&kcp->kcp_lock);
if (!kcd) {
splat_vprint(file, SPLAT_KMEM_TEST8_NAME, splat_vprint(file, SPLAT_KMEM_TEST8_NAME,
"Unable to allocate from '%s'\n", "Unable to create '%s'\n", "kct");
SPLAT_KMEM_CACHE_NAME); rc = -ENOMEM;
} goto out_cache;
}
rc = splat_kmem_cache_test_kcd_alloc(kcp, kct, SPLAT_KMEM_OBJ_COUNT);
if (rc) {
splat_vprint(file, SPLAT_KMEM_TEST8_NAME, "Unable to "
"allocate from '%s'\n", SPLAT_KMEM_CACHE_NAME);
goto out_kct;
} }
/* Request the slab cache free any objects it can. For a few reasons
* this may not immediately result in more free memory even if objects
* are freed. First off, due to fragmentation we may not be able to
* reclaim any slabs. Secondly, even if we do we fully clear some
* slabs we will not want to immedately reclaim all of them because
* we may contend with cache allocs and thrash. What we want to see
* is the slab size decrease more gradually as it becomes clear they
* will not be needed. This should be acheivable in less than minute
* if it takes longer than this something has gone wrong.
*/
for (i = 0; i < 60; i++) { for (i = 0; i < 60; i++) {
kmem_cache_reap_now(kcp->kcp_cache); kmem_cache_reap_now(kcp->kcp_cache);
splat_kmem_cache_test_debug(file, SPLAT_KMEM_TEST8_NAME, kcp); splat_kmem_cache_test_debug(file, SPLAT_KMEM_TEST8_NAME, kcp);
@ -864,31 +872,39 @@ splat_kmem_test8(struct file *file, void *arg)
} }
/* Cleanup our mess (for failure case of time expiring) */ /* Cleanup our mess (for failure case of time expiring) */
spin_lock(&kcp->kcp_lock); splat_kmem_cache_test_kcd_free(kcp, kct);
for (i = 0; i < SPLAT_KMEM_OBJ_COUNT; i++) out_kct:
if (kcp->kcp_kcd[i]) splat_kmem_cache_test_kct_free(kcp, kct);
kmem_cache_free(kcp->kcp_cache, kcp->kcp_kcd[i]); out_cache:
spin_unlock(&kcp->kcp_lock);
kmem_cache_destroy(kcp->kcp_cache); kmem_cache_destroy(kcp->kcp_cache);
out_kcp:
splat_kmem_cache_test_kcp_free(kcp); splat_kmem_cache_test_kcp_free(kcp);
out:
return rc; return rc;
} }
/* Test cache aging, we have allocated a large number of objects thus
* creating a large number of slabs and then free'd them all. However,
* since there should be little memory pressure at the moment those
* slabs have not been freed. What we want to see is the slab size
* decrease gradually as it becomes clear they will not be be needed.
* This should be achievable in less than minute. If it takes longer
* than this something has gone wrong.
*/
static int static int
splat_kmem_test9(struct file *file, void *arg) splat_kmem_test9(struct file *file, void *arg)
{ {
kmem_cache_priv_t *kcp; kmem_cache_priv_t *kcp;
kmem_cache_data_t *kcd; kmem_cache_thread_t *kct;
int i, rc = 0, count = SPLAT_KMEM_OBJ_COUNT * 128; int i, rc = 0, count = SPLAT_KMEM_OBJ_COUNT * 128;
kcp = splat_kmem_cache_test_kcp_alloc(file, SPLAT_KMEM_TEST9_NAME, kcp = splat_kmem_cache_test_kcp_alloc(file, SPLAT_KMEM_TEST9_NAME,
256, 0, 0, count); 256, 0, 0);
if (!kcp) { if (!kcp) {
splat_vprint(file, SPLAT_KMEM_TEST9_NAME, splat_vprint(file, SPLAT_KMEM_TEST9_NAME,
"Unable to create '%s'\n", "kcp"); "Unable to create '%s'\n", "kcp");
return -ENOMEM; rc = -ENOMEM;
goto out;
} }
kcp->kcp_cache = kcp->kcp_cache =
@ -897,38 +913,29 @@ splat_kmem_test9(struct file *file, void *arg)
splat_kmem_cache_test_destructor, splat_kmem_cache_test_destructor,
NULL, kcp, NULL, 0); NULL, kcp, NULL, 0);
if (!kcp->kcp_cache) { if (!kcp->kcp_cache) {
splat_kmem_cache_test_kcp_free(kcp);
splat_vprint(file, SPLAT_KMEM_TEST9_NAME, splat_vprint(file, SPLAT_KMEM_TEST9_NAME,
"Unable to create '%s'\n", SPLAT_KMEM_CACHE_NAME); "Unable to create '%s'\n", SPLAT_KMEM_CACHE_NAME);
return -ENOMEM; rc = -ENOMEM;
goto out_kcp;
} }
for (i = 0; i < count; i++) { kct = splat_kmem_cache_test_kct_alloc(kcp, 0);
kcd = kmem_cache_alloc(kcp->kcp_cache, KM_SLEEP); if (!kct) {
spin_lock(&kcp->kcp_lock); splat_vprint(file, SPLAT_KMEM_TEST8_NAME,
kcp->kcp_kcd[i] = kcd; "Unable to create '%s'\n", "kct");
spin_unlock(&kcp->kcp_lock); rc = -ENOMEM;
if (!kcd) { goto out_cache;
splat_vprint(file, SPLAT_KMEM_TEST9_NAME,
"Unable to allocate from '%s'\n",
SPLAT_KMEM_CACHE_NAME);
}
} }
spin_lock(&kcp->kcp_lock); rc = splat_kmem_cache_test_kcd_alloc(kcp, kct, count);
for (i = 0; i < count; i++) if (rc) {
if (kcp->kcp_kcd[i]) splat_vprint(file, SPLAT_KMEM_TEST9_NAME, "Unable to "
kmem_cache_free(kcp->kcp_cache, kcp->kcp_kcd[i]); "allocate from '%s'\n", SPLAT_KMEM_CACHE_NAME);
spin_unlock(&kcp->kcp_lock); goto out_kct;
}
splat_kmem_cache_test_kcd_free(kcp, kct);
/* We have allocated a large number of objects thus creating a
* large number of slabs and then free'd them all. However since
* there should be little memory pressure at the moment those
* slabs have not been freed. What we want to see is the slab
* size decrease gradually as it becomes clear they will not be
* be needed. This should be acheivable in less than minute
* if it takes longer than this something has gone wrong.
*/
for (i = 0; i < 60; i++) { for (i = 0; i < 60; i++) {
splat_kmem_cache_test_debug(file, SPLAT_KMEM_TEST9_NAME, kcp); splat_kmem_cache_test_debug(file, SPLAT_KMEM_TEST9_NAME, kcp);
@ -952,9 +959,13 @@ splat_kmem_test9(struct file *file, void *arg)
rc = -ENOMEM; rc = -ENOMEM;
} }
out_kct:
splat_kmem_cache_test_kct_free(kcp, kct);
out_cache:
kmem_cache_destroy(kcp->kcp_cache); kmem_cache_destroy(kcp->kcp_cache);
out_kcp:
splat_kmem_cache_test_kcp_free(kcp); splat_kmem_cache_test_kcp_free(kcp);
out:
return rc; return rc;
} }
@ -971,7 +982,7 @@ splat_kmem_test10(struct file *file, void *arg)
{ {
uint64_t size, alloc, rc = 0; uint64_t size, alloc, rc = 0;
for (size = 16; size <= 1024*1024; size *= 2) { for (size = 32; size <= 1024*1024; size *= 2) {
splat_vprint(file, SPLAT_KMEM_TEST10_NAME, "%-22s %s", "name", splat_vprint(file, SPLAT_KMEM_TEST10_NAME, "%-22s %s", "name",
"time (sec)\tslabs \tobjs \thash\n"); "time (sec)\tslabs \tobjs \thash\n");
@ -1013,7 +1024,7 @@ splat_kmem_test11(struct file *file, void *arg)
{ {
uint64_t size, alloc, rc; uint64_t size, alloc, rc;
size = 256*1024; size = 8 * 1024;
alloc = ((4 * physmem * PAGE_SIZE) / size) / SPLAT_KMEM_THREADS; alloc = ((4 * physmem * PAGE_SIZE) / size) / SPLAT_KMEM_THREADS;
splat_vprint(file, SPLAT_KMEM_TEST11_NAME, "%-22s %s", "name", splat_vprint(file, SPLAT_KMEM_TEST11_NAME, "%-22s %s", "name",
@ -1132,7 +1143,7 @@ static int
splat_kmem_test13(struct file *file, void *arg) splat_kmem_test13(struct file *file, void *arg)
{ {
kmem_cache_priv_t *kcp; kmem_cache_priv_t *kcp;
kmem_cache_data_t *kcd; kmem_cache_thread_t *kct;
dummy_page_t *dp; dummy_page_t *dp;
struct list_head list; struct list_head list;
struct timespec start, delta = { 0, 0 }; struct timespec start, delta = { 0, 0 };
@ -1143,11 +1154,12 @@ splat_kmem_test13(struct file *file, void *arg)
count = ((physmem * PAGE_SIZE) / 4 / size); count = ((physmem * PAGE_SIZE) / 4 / size);
kcp = splat_kmem_cache_test_kcp_alloc(file, SPLAT_KMEM_TEST13_NAME, kcp = splat_kmem_cache_test_kcp_alloc(file, SPLAT_KMEM_TEST13_NAME,
size, 0, 0, count); size, 0, 0);
if (!kcp) { if (!kcp) {
splat_vprint(file, SPLAT_KMEM_TEST13_NAME, splat_vprint(file, SPLAT_KMEM_TEST13_NAME,
"Unable to create '%s'\n", "kcp"); "Unable to create '%s'\n", "kcp");
return -ENOMEM; rc = -ENOMEM;
goto out;
} }
kcp->kcp_cache = kcp->kcp_cache =
@ -1157,22 +1169,25 @@ splat_kmem_test13(struct file *file, void *arg)
splat_kmem_cache_test_reclaim, splat_kmem_cache_test_reclaim,
kcp, NULL, 0); kcp, NULL, 0);
if (!kcp->kcp_cache) { if (!kcp->kcp_cache) {
splat_kmem_cache_test_kcp_free(kcp);
splat_vprint(file, SPLAT_KMEM_TEST13_NAME, splat_vprint(file, SPLAT_KMEM_TEST13_NAME,
"Unable to create '%s'\n", SPLAT_KMEM_CACHE_NAME); "Unable to create '%s'\n", SPLAT_KMEM_CACHE_NAME);
return -ENOMEM; rc = -ENOMEM;
goto out_kcp;
} }
for (i = 0; i < count; i++) { kct = splat_kmem_cache_test_kct_alloc(kcp, 0);
kcd = kmem_cache_alloc(kcp->kcp_cache, KM_SLEEP); if (!kct) {
spin_lock(&kcp->kcp_lock);
kcp->kcp_kcd[i] = kcd;
spin_unlock(&kcp->kcp_lock);
if (!kcd) {
splat_vprint(file, SPLAT_KMEM_TEST13_NAME, splat_vprint(file, SPLAT_KMEM_TEST13_NAME,
"Unable to allocate from '%s'\n", "Unable to create '%s'\n", "kct");
SPLAT_KMEM_CACHE_NAME); rc = -ENOMEM;
goto out_cache;
} }
rc = splat_kmem_cache_test_kcd_alloc(kcp, kct, count);
if (rc) {
splat_vprint(file, SPLAT_KMEM_TEST13_NAME, "Unable to "
"allocate from '%s'\n", SPLAT_KMEM_CACHE_NAME);
goto out_kct;
} }
i = 0; i = 0;
@ -1180,6 +1195,7 @@ splat_kmem_test13(struct file *file, void *arg)
INIT_LIST_HEAD(&list); INIT_LIST_HEAD(&list);
start = current_kernel_time(); start = current_kernel_time();
/* Apply memory pressure */
while (kcp->kcp_cache->skc_slab_total > (slabs >> 2)) { while (kcp->kcp_cache->skc_slab_total > (slabs >> 2)) {
if ((i % 10000) == 0) if ((i % 10000) == 0)
@ -1226,15 +1242,14 @@ splat_kmem_test13(struct file *file, void *arg)
} }
/* Release remaining kmem cache objects */ /* Release remaining kmem cache objects */
spin_lock(&kcp->kcp_lock); splat_kmem_cache_test_kcd_free(kcp, kct);
for (i = 0; i < count; i++) out_kct:
if (kcp->kcp_kcd[i]) splat_kmem_cache_test_kct_free(kcp, kct);
kmem_cache_free(kcp->kcp_cache, kcp->kcp_kcd[i]); out_cache:
spin_unlock(&kcp->kcp_lock);
kmem_cache_destroy(kcp->kcp_cache); kmem_cache_destroy(kcp->kcp_cache);
out_kcp:
splat_kmem_cache_test_kcp_free(kcp); splat_kmem_cache_test_kcp_free(kcp);
out:
return rc; return rc;
} }