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Switch KM_SLEEP to KM_PUSHPAGE

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Under certain circumstances the following functions may be called
in a context where KM_SLEEP is unsafe and can result in a deadlocked
system.  To avoid this problem the unconditional KM_SLEEPs are
converted to KM_PUSHPAGEs.  This will prevent them from attempting
to initiate any I/O during direct reclaim.

This change was originally part of cd5ca4b but was reverted by
330fe01.  It always should have had its own commit for exactly
this reason.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf 2012-09-12 12:24:41 -07:00
parent 9b51f21841
commit 3050c9314f
1 changed files with 2 additions and 2 deletions
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4
module/spl/spl-thread.c
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@ -98,14 +98,14 @@ __thread_create(caddr_t stk, size_t stksize, thread_func_t func,
/* Variable stack size unsupported */
ASSERT(stk == NULL);
tp = kmem_alloc(sizeof(thread_priv_t), KM_SLEEP);
tp = kmem_alloc(sizeof(thread_priv_t), KM_PUSHPAGE);
if (tp == NULL)
SRETURN(NULL);
tp->tp_magic = TP_MAGIC;
tp->tp_name_size = strlen(name) + 1;
tp->tp_name = kmem_alloc(tp->tp_name_size, KM_SLEEP);
tp->tp_name = kmem_alloc(tp->tp_name_size, KM_PUSHPAGE);
if (tp->tp_name == NULL) {
kmem_free(tp, sizeof(thread_priv_t));
SRETURN(NULL);