| commit | 73101af2cf10ca65e7be85f900483f9393940d23 | |
| author | Matthew Dillon <dillon@apollo.backplane.com> | |
| Mon, 6 Feb 2017 02:56:45 +0000 (5 18:56 -0800) | ||
| committer | Matthew Dillon <dillon@apollo.backplane.com> | |
| Mon, 6 Feb 2017 02:56:45 +0000 (5 18:56 -0800) | ||
| tree | 63624464dbd3e448b96a245cf5ff89034e98504a | treesnapshot (tar.gz zip) |
| parent | 635c9c159eb758c1328d8a014b7cb1d0255d00ab | commitdiff |
kernel - Remove unneeded map token use from the vm_fault path.
* vm_fault() and vm_fault_page() does not need to hold the map_token.
They already hold the standard vm_map lock.
* This improves re-faulting in a multi-threaded environment, resulting
in a fully shared-lock and essentially uncontended path. It will not
improve initial faulting where a vm_page has to be allocated into the
backing vm_object (which requires an exclusive object token).
* vm_fault() and vm_fault_page() does not need to hold the map_token.
They already hold the standard vm_map lock.
* This improves re-faulting in a multi-threaded environment, resulting
in a fully shared-lock and essentially uncontended path. It will not
improve initial faulting where a vm_page has to be allocated into the
backing vm_object (which requires an exclusive object token).
| sys/vm/vm_fault.c | diffblobblamehistory |