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o Introduce vm_page_sleep_if_busy() as an eventual replacement for

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vm_page_sleep_busy().  vm_page_sleep_if_busy() uses the page
   queues lock.
This commit is contained in:
Alan Cox 2002-07-29 19:41:22 +00:00
parent b7f2cf173e
commit e5f8bd9418
2 changed files with 23 additions and 0 deletions

22
sys/vm/vm_page.c

@ -552,6 +552,28 @@ vm_page_sleep_busy(vm_page_t m, int also_m_busy, const char *msg)
} }
return (FALSE); return (FALSE);
} }
/*
* vm_page_sleep_if_busy:
*
* Sleep and release the page queues lock if PG_BUSY is set or,
* if also_m_busy is TRUE, busy is non-zero. Returns TRUE if the
* thread slept and the page queues lock was released.
* Otherwise, retains the page queues lock and returns FALSE.
*/
int
vm_page_sleep_if_busy(vm_page_t m, int also_m_busy, const char *msg)
{
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
if ((m->flags & PG_BUSY) || (also_m_busy && m->busy)) {
vm_page_flag_set(m, PG_WANTED | PG_REFERENCED);
msleep(m, &vm_page_queue_mtx, PDROP | PVM, msg, 0);
return (TRUE);
}
return (FALSE);
}
/* /*
* vm_page_dirty: * vm_page_dirty:
* *

1
sys/vm/vm_page.h

@ -332,6 +332,7 @@ void vm_page_copy(vm_page_t src_m, vm_page_t dest_m);
void vm_page_free(vm_page_t m); void vm_page_free(vm_page_t m);
void vm_page_free_zero(vm_page_t m); void vm_page_free_zero(vm_page_t m);
int vm_page_sleep_busy(vm_page_t m, int also_m_busy, const char *msg); int vm_page_sleep_busy(vm_page_t m, int also_m_busy, const char *msg);
int vm_page_sleep_if_busy(vm_page_t m, int also_m_busy, const char *msg);
void vm_page_dirty(vm_page_t m); void vm_page_dirty(vm_page_t m);
void vm_page_undirty(vm_page_t m); void vm_page_undirty(vm_page_t m);
void vm_page_wakeup(vm_page_t m); void vm_page_wakeup(vm_page_t m);