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Add KMC_NOEMERGENCY slab flag

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Provide a flag to disable the use of emergency objects for a
specific kmem cache.  There may be instances where under no
circumstances should you kmalloc() an emergency object.  For
example, when you cache contains very large objects (>128k).

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf 2012-09-07 14:24:17 -07:00
parent ac8ca67a88
commit cb5c2acebb
2 changed files with 9 additions and 2 deletions
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2
include/sys/kmem.h
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@ -340,6 +340,7 @@ enum {
KMC_BIT_KMEM = 5, /* Use kmem cache */
KMC_BIT_VMEM = 6, /* Use vmem cache */
KMC_BIT_OFFSLAB = 7, /* Objects not on slab */
KMC_BIT_NOEMERGENCY = 8, /* Disable emergency objects */
KMC_BIT_GROWING = 15, /* Growing in progress */
KMC_BIT_REAPING = 16, /* Reaping in progress */
KMC_BIT_DESTROY = 17, /* Destroy in progress */
@ -365,6 +366,7 @@ typedef enum kmem_cbrc {
#define KMC_KMEM (1 << KMC_BIT_KMEM)
#define KMC_VMEM (1 << KMC_BIT_VMEM)
#define KMC_OFFSLAB (1 << KMC_BIT_OFFSLAB)
#define KMC_NOEMERGENCY (1 << KMC_BIT_NOEMERGENCY)
#define KMC_GROWING (1 << KMC_BIT_GROWING)
#define KMC_REAPING (1 << KMC_BIT_REAPING)
#define KMC_DESTROY (1 << KMC_BIT_DESTROY)

9
module/spl/spl-kmem.c
View File

@ -1727,8 +1727,13 @@ spl_cache_grow(spl_kmem_cache_t *skc, int flags, void **obj)
*/
remaining = wait_event_timeout(skc->skc_waitq,
spl_cache_grow_wait(skc), 1);
if (remaining == 0)
rc = spl_emergency_alloc(skc, flags, obj);
if (remaining == 0) {
if (test_bit(KMC_BIT_NOEMERGENCY, &skc->skc_flags))
rc = -ENOMEM;
else
rc = spl_emergency_alloc(skc, flags, obj);
}
SRETURN(rc);
}