Mark Johnston f4134e3d87 Implement an approximation of Linux MADV_DONTNEED semantics. ... Linux MADV_DONTNEED is not advisory: it has side effects for anonymous memory, and some system software depends on that. In particular, MADV_DONTNEED causes anonymous pages to be discarded. If the mapping is a private mapping of a named object then subsequent faults are to repopulate the range from that object, otherwise pages will be zero-filled. For mappings of non-anonymous objects, Linux MADV_DONTNEED can be implemented in the same way as our MADV_DONTNEED. This implementation differs from Linux semantics in its handling of private mappings, inherited through fork(), of non-anonymous objects. After applying MADV_DONTNEED, subsequent faults will repopulate the mapping from the parent object rather than the root of the shadow chain. PR: 230160 Reviewed by: alc, kib Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D25330		2020-06-25 20:30:30 +00:00
..
cloudabi	vfs: track sequential reads and writes separately	2020-06-21 08:51:24 +00:00
cloudabi32	sysent targets: further cleanup and deduplication	2020-01-18 20:37:45 +00:00
cloudabi64	sysent targets: further cleanup and deduplication	2020-01-18 20:37:45 +00:00
freebsd32	Refactor ptrace() ABI compatibility.	2020-06-09 16:43:23 +00:00
ia32	Retire procfs-based process debugging.	2020-04-01 19:22:09 +00:00
lindebugfs	LinuxKPI: Finalize move of lindebugfs from ports to base.	2019-05-19 15:44:21 +00:00
linprocfs	fd: move vnodes out of filedesc into a dedicated structure	2020-03-01 21:53:46 +00:00
linsysfs	Create a "drm" subdirectory for drm devices in linsysfs. Recent versions of	2019-09-23 12:27:55 +00:00
linux	Implement an approximation of Linux MADV_DONTNEED semantics.	2020-06-25 20:30:30 +00:00
linuxkpi/common	In r362552, RB_SET_PARENT is defined, and use in parens in	2020-06-23 22:47:54 +00:00
ndis	Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many)	2020-02-26 14:26:36 +00:00
netbsd	sys/compat: further adoption of SPDX licensing ID tags.	2017-11-27 15:13:23 +00:00
x86bios	Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (17 of many)	2020-02-26 14:26:36 +00:00