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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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module/spl/spl-kmem.c
+7 -2
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@@ -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);
}