diff options
Diffstat (limited to 'sys/vm/vm_page.c')
| -rw-r--r-- | sys/vm/vm_page.c | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c index f166649..054148b 100644 --- a/sys/vm/vm_page.c +++ b/sys/vm/vm_page.c @@ -601,21 +601,20 @@ vm_page_sunbusy(vm_page_t m) * This is used to implement the hard-path of busying mechanism. * * The given page must be locked. + * + * If nonshared is true, sleep only if the page is xbusy. */ void -vm_page_busy_sleep(vm_page_t m, const char *wmesg) +vm_page_busy_sleep(vm_page_t m, const char *wmesg, bool nonshared) { u_int x; - vm_page_lock_assert(m, MA_OWNED); + vm_page_assert_locked(m); x = m->busy_lock; - if (x == VPB_UNBUSIED) { - vm_page_unlock(m); - return; - } - if ((x & VPB_BIT_WAITERS) == 0 && - !atomic_cmpset_int(&m->busy_lock, x, x | VPB_BIT_WAITERS)) { + if (x == VPB_UNBUSIED || (nonshared && (x & VPB_BIT_SHARED) != 0) || + ((x & VPB_BIT_WAITERS) == 0 && + !atomic_cmpset_int(&m->busy_lock, x, x | VPB_BIT_WAITERS))) { vm_page_unlock(m); return; } @@ -928,7 +927,7 @@ vm_page_sleep_if_busy(vm_page_t m, const char *msg) obj = m->object; vm_page_lock(m); VM_OBJECT_WUNLOCK(obj); - vm_page_busy_sleep(m, msg); + vm_page_busy_sleep(m, msg, false); VM_OBJECT_WLOCK(obj); return (TRUE); } @@ -2717,7 +2716,8 @@ retrylookup: vm_page_aflag_set(m, PGA_REFERENCED); vm_page_lock(m); VM_OBJECT_WUNLOCK(object); - vm_page_busy_sleep(m, "pgrbwt"); + vm_page_busy_sleep(m, "pgrbwt", (allocflags & + VM_ALLOC_IGN_SBUSY) != 0); VM_OBJECT_WLOCK(object); goto retrylookup; } else { |
