| commit | 635c9c159eb758c1328d8a014b7cb1d0255d00ab | |
| author | Matthew Dillon <dillon@apollo.backplane.com> | |
| Mon, 6 Feb 2017 02:51:24 +0000 (5 18:51 -0800) | ||
| committer | Matthew Dillon <dillon@apollo.backplane.com> | |
| Mon, 6 Feb 2017 02:53:45 +0000 (5 18:53 -0800) | ||
| tree | 406a16374febdc91448df5184935c08d3a072b14 | treesnapshot (tar.gz zip) |
| parent | f76ae5a73ea6be0b0cfb0bbd67ac00aa00ba6702 | commitdiff |
kernel - Refactor vm_page_alloc() to improve hot pages
* Since we do not pre-zero pages any more, nothing uses PG_ZERO and we no
longer have to use the head and tail of the free queue as an indication
of a possibly freed page being zerod or not.
For PQ_FREE, refactor the use case to always be LIFO, improving chances
that vm_page_alloc() will retrieve a page that is already hot in the
cache.
* Should improve the host, and in particular will improve the vkernel,
preventing it from unnecessarily cycling new pages (faulting them in
on the host) when normal operation is in steady-state, and also reducing
unnecessary initial/fresh faults.
* Since we do not pre-zero pages any more, nothing uses PG_ZERO and we no
longer have to use the head and tail of the free queue as an indication
of a possibly freed page being zerod or not.
For PQ_FREE, refactor the use case to always be LIFO, improving chances
that vm_page_alloc() will retrieve a page that is already hot in the
cache.
* Should improve the host, and in particular will improve the vkernel,
preventing it from unnecessarily cycling new pages (faulting them in
on the host) when normal operation is in steady-state, and also reducing
unnecessary initial/fresh faults.
| sys/vm/vm_page.c | diffblobblamehistory | |
| sys/vm/vm_page.h | diffblobblamehistory | |
| sys/vm/vm_pageout.c | diffblobblamehistory |