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Remove TQ_SLEEP -> KM_SLEEP mapping

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When the taskq code was originally written it seemed like a good
idea to simply map TQ_SLEEP to KM_SLEEP.  Unfortunately, this
assumed that the TQ_* flags would never confict with any of the
Linux GFP_* flags.  When adding the TQ_PUSHPAGE support in commit
cd5ca4b this invariant was accidentally broken.

Therefore to support TQ_PUSHPAGE, which is needed for Linux, and
prevent any further confusion I have removed this direct mapping.
The TQ_SLEEP, TQ_NOSLEEP, and TQ_PUSHPAGE are no longer defined
in terms of their KM_* counterparts.  Instead a simple mapping
function is introduce to convert TQ_* -> KM_* where needed.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #171
This commit is contained in:
Brian Behlendorf 2012-09-12 11:31:39 -07:00
parent 330fe010e4
commit 9b51f21841
2 changed files with 19 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/sys/taskq.h
View File

@ -60,8 +60,9 @@ typedef struct taskq_ent {
* KM_SLEEP/KM_NOSLEEP. TQ_NOQUEUE/TQ_NOALLOC are set particularly
* large so as not to conflict with already used GFP_* defines.
*/
#define TQ_SLEEP KM_SLEEP
#define TQ_NOSLEEP KM_NOSLEEP
#define TQ_SLEEP 0x00000000
#define TQ_NOSLEEP 0x00000001
#define TQ_PUSHPAGE 0x00000002
#define TQ_NOQUEUE 0x01000000
#define TQ_NOALLOC 0x02000000
#define TQ_NEW 0x04000000

30
module/spl/spl-taskq.c
View File

@ -38,6 +38,18 @@
taskq_t *system_taskq;
EXPORT_SYMBOL(system_taskq);
static int
task_km_flags(uint_t flags)
{
if (flags & TQ_NOSLEEP)
return KM_NOSLEEP;
if (flags & TQ_PUSHPAGE)
return KM_PUSHPAGE;
return KM_SLEEP;
}
/*
* NOTE: Must be called with tq->tq_lock held, returns a list_t which
* is not attached to the free, work, or pending taskq lists.
@ -50,8 +62,6 @@ task_alloc(taskq_t *tq, uint_t flags)
SENTRY;
ASSERT(tq);
ASSERT(flags & (TQ_SLEEP | TQ_NOSLEEP)); /* One set */
ASSERT(!((flags & TQ_SLEEP) && (flags & TQ_NOSLEEP))); /* Not both */
ASSERT(spin_is_locked(&tq->tq_lock));
retry:
/* Acquire taskq_ent_t's from free list if available */
@ -92,7 +102,7 @@ retry:
}
spin_unlock_irqrestore(&tq->tq_lock, tq->tq_lock_flags);
t = kmem_alloc(sizeof(taskq_ent_t), flags & (TQ_SLEEP | TQ_NOSLEEP));
t = kmem_alloc(sizeof(taskq_ent_t), task_km_flags(flags));
spin_lock_irqsave(&tq->tq_lock, tq->tq_lock_flags);
if (t) {
@ -251,14 +261,6 @@ __taskq_dispatch(taskq_t *tq, task_func_t func, void *arg, uint_t flags)
ASSERT(tq);
ASSERT(func);
/* Solaris assumes TQ_SLEEP if not passed explicitly */
if (!(flags & (TQ_SLEEP | TQ_NOSLEEP)))
flags |= TQ_SLEEP;
if (unlikely(in_atomic() && (flags & TQ_SLEEP)))
PANIC("May schedule while atomic: %s/0x%08x/%d\n",
current->comm, preempt_count(), current->pid);
spin_lock_irqsave(&tq->tq_lock, tq->tq_lock_flags);
/* Taskq being destroyed and all tasks drained */
@ -554,7 +556,7 @@ __taskq_create(const char *name, int nthreads, pri_t pri,
nthreads = MAX((num_online_cpus() * nthreads) / 100, 1);
}
tq = kmem_alloc(sizeof(*tq), KM_SLEEP);
tq = kmem_alloc(sizeof(*tq), KM_PUSHPAGE);
if (tq == NULL)
SRETURN(NULL);
@ -580,12 +582,12 @@ __taskq_create(const char *name, int nthreads, pri_t pri,
if (flags & TASKQ_PREPOPULATE)
for (i = 0; i < minalloc; i++)
task_done(tq, task_alloc(tq, TQ_SLEEP | TQ_NEW));
task_done(tq, task_alloc(tq, TQ_PUSHPAGE | TQ_NEW));
spin_unlock_irqrestore(&tq->tq_lock, tq->tq_lock_flags);
for (i = 0; i < nthreads; i++) {
tqt = kmem_alloc(sizeof(*tqt), KM_SLEEP);
tqt = kmem_alloc(sizeof(*tqt), KM_PUSHPAGE);
INIT_LIST_HEAD(&tqt->tqt_thread_list);
INIT_LIST_HEAD(&tqt->tqt_active_list);
tqt->tqt_tq = tq;