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Optimize vm_object_split()'s handling of reservations.

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This commit is contained in:
Alan Cox 2011-12-28 20:27:18 +00:00
parent fe8b9971a8
commit b5f359b7c3
1 changed files with 15 additions and 0 deletions
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15
sys/vm/vm_object.c
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@ -1323,6 +1323,21 @@ retry:
VM_OBJECT_LOCK(new_object);
goto retry;
}
#if VM_NRESERVLEVEL > 0
/*
* If some of the reservation's allocated pages remain with
* the original object, then transferring the reservation to
* the new object is neither particularly beneficial nor
* particularly harmful as compared to leaving the reservation
* with the original object. If, however, all of the
* reservation's allocated pages are transferred to the new
* object, then transferring the reservation is typically
* beneficial. Determining which of these two cases applies
* would be more costly than unconditionally renaming the
* reservation.
*/
vm_reserv_rename(m, new_object, orig_object, offidxstart);
#endif
vm_page_lock(m);
vm_page_rename(m, new_object, idx);
vm_page_unlock(m);