f4134e3d87
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 |
||
|---|---|---|
| .. | ||
| cloudabi | ||
| cloudabi32 | ||
| cloudabi64 | ||
| freebsd32 | ||
| ia32 | ||
| lindebugfs | ||
| linprocfs | ||
| linsysfs | ||
| linux | ||
| linuxkpi/common | ||
| ndis | ||
| netbsd | ||
| x86bios | ||