Alan Cox 103cc0f6ea Revert r329254. The underlying cause for the copy-on-write problem in ...

multithreaded programs that was addressed by r329254 was in the
implementation of pmap_enter() on some architectures, notably, amd64.
kib@, markj@ and I have audited all of the pmap_enter() implementations,
and fixed the broken ones, specifically, amd64 (r335784, r335971), i386
(r336092), mips (r336248), and riscv (r336294).

To be clear, the reason to address the problem within pmap_enter() and
revert r329254 is not just a matter of principle.  An effect of r329254
was that a copy-on-write fault actually entailed two page faults, not
one, even for single-threaded programs.  Now, in the expected case for
either single- or multithreaded programs, we are back to a single page
fault to complete a copy-on-write operation.  (In extremely rare
circumstances, a multithreaded program could suffer two page faults.)

Reviewed by:	kib, markj
Tested by:	truckman
MFC after:	3 weeks
Differential Revision:	https://reviews.freebsd.org/D16301

2018-07-19 17:01:10 +00:00

..

_vm_radix.h

sys: general adoption of SPDX licensing ID tags.

2017-11-27 15:23:17 +00:00

default_pager.c

SPDX: wrong license.

2017-11-30 15:45:42 +00:00

device_pager.c

sys: further adoption of SPDX licensing ID tags.

2017-11-20 19:43:44 +00:00

memguard.c

Eliminate kmem_arena and kmem_object in preparation for further NUMA commits.

2017-11-28 23:40:54 +00:00

memguard.h

sys: general adoption of SPDX licensing ID tags.

2017-11-27 15:23:17 +00:00

phys_pager.c

sys: general adoption of SPDX licensing ID tags.

2017-11-27 15:23:17 +00:00

pmap.h

sys: further adoption of SPDX licensing ID tags.

2017-11-20 19:43:44 +00:00

redzone.c

sys: general adoption of SPDX licensing ID tags.

2017-11-27 15:23:17 +00:00

redzone.h

sys: general adoption of SPDX licensing ID tags.

2017-11-27 15:23:17 +00:00

sg_pager.c

sys: general adoption of SPDX licensing ID tags.

2017-11-27 15:23:17 +00:00

swap_pager.c

Handle the race between fork/vm_object_split() and faults.

2018-06-14 19:41:02 +00:00

swap_pager.h

sys: further adoption of SPDX licensing ID tags.

2017-11-20 19:43:44 +00:00

uma_core.c

uma: whack main zone counter update in the slow path, freeing side

2018-07-12 22:35:52 +00:00

uma_dbg.c

sys: general adoption of SPDX licensing ID tags.

2017-11-27 15:23:17 +00:00

uma_dbg.h

sys: general adoption of SPDX licensing ID tags.

2017-11-27 15:23:17 +00:00

uma_int.h

Sort uma_zone fields according to 64 byte cache line with adjacent line

2018-06-23 08:10:09 +00:00

uma.h

Back pcpu zone with domain correct pages

2018-07-06 02:06:03 +00:00

vm_domainset.c

Use the canonical check for reservation support.

2018-05-19 23:49:13 +00:00

vm_domainset.h

Implement several enhancements to NUMA policies.

2018-03-29 02:54:50 +00:00

vm_extern.h

Make UMA and malloc(9) return non-executable memory in most cases.

2018-06-13 17:04:41 +00:00

vm_fault.c

Revert r329254. The underlying cause for the copy-on-write problem in

2018-07-19 17:01:10 +00:00

vm_glue.c

Account the size of the vslock-ed memory by the thread.

2018-03-24 13:51:27 +00:00

vm_init.c

Make UMA and malloc(9) return non-executable memory in most cases.

2018-06-13 17:04:41 +00:00

vm_kern.c

Make UMA and malloc(9) return non-executable memory in most cases.

2018-06-13 17:04:41 +00:00

vm_kern.h

Make UMA and malloc(9) return non-executable memory in most cases.

2018-06-13 17:04:41 +00:00

vm_map.c

Save a call to pmap_remove() if entry cannot have any pages mapped.

2018-07-06 12:44:48 +00:00

vm_map.h

inline atomics and allow tied modules to inline locks

2018-07-02 19:48:38 +00:00

vm_meter.c

vm: move vm_cnt to __read_mostly now that it is not written to

2018-04-27 05:36:02 +00:00

vm_mmap.c

Use a single, consistent approach to returning success versus failure in

2018-06-04 16:28:06 +00:00

vm_object.c

Fix some races introduced in r332974.

2018-05-04 17:17:30 +00:00

vm_object.h

Use per-domain locks for vm page queue free. Move paging control from

2018-02-06 22:10:07 +00:00

vm_page.c

Create a new macro for static DPCPU data.

2018-07-05 17:13:37 +00:00

vm_page.h

inline atomics and allow tied modules to inline locks

2018-07-02 19:48:38 +00:00

vm_pageout.c

Test PGA_REFERENCED after calling pmap_ts_referenced(), rather than before,

2018-07-15 19:25:15 +00:00

vm_pageout.h

Fix GCC build: Remove redundant pagedaemon_wakeup declaration

2018-03-16 07:05:09 +00:00

vm_pagequeue.h

Make UMA and malloc(9) return non-executable memory in most cases.

2018-06-13 17:04:41 +00:00

vm_pager.c

SPDX: Consider code from Carnegie-Mellon University.

2017-11-30 15:48:35 +00:00

vm_pager.h

sys: further adoption of SPDX licensing ID tags.

2017-11-20 19:43:44 +00:00

vm_param.h

SPDX: Consider code from Carnegie-Mellon University.

2017-11-30 15:48:35 +00:00

vm_phys.c

Allow callers to vm_phys_split_pages() to specify whether insertion should

2018-07-05 02:08:57 +00:00

vm_phys.h

Update the physical page selection strategy used by vm_page_import() so

2018-06-26 18:29:56 +00:00

vm_radix.c

vm: stop passing M_ZERO when allocating radix nodes

2018-06-24 13:08:05 +00:00

vm_radix.h

sys: general adoption of SPDX licensing ID tags.

2017-11-27 15:23:17 +00:00

vm_reserv.c

Use the ticks since the last update to reduce hysteresis in the partpopq and

2018-07-07 01:54:45 +00:00

vm_reserv.h

Lock reservations with a dedicated lock in each reservation. Protect the

2018-03-22 19:21:11 +00:00

vm_swapout_dummy.c

SPDX: Consider code from Carnegie-Mellon University.

2017-11-30 15:48:35 +00:00

vm_swapout.c

Improve VM page queue scalability.

2018-04-24 21:15:54 +00:00

vm_unix.c

Split kern_break from sys_break and use it in linuxulator

2018-06-27 14:45:13 +00:00

vm.h

Move vm_ndomains to vm.h where it can be used with a single header include

2018-03-27 03:27:02 +00:00

vnode_pager.c

Implement several enhancements to NUMA policies.

2018-03-29 02:54:50 +00:00

vnode_pager.h

sys: further adoption of SPDX licensing ID tags.

2017-11-20 19:43:44 +00:00